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Linux Analysis Report
na.elf

Overview

General Information

Sample name:	na.elf
Analysis ID:	1532424
MD5:	8087c36ad6c48d8871089112ba7e86c8
SHA1:	f1cab2cf7c94b3b06f23f291d42bc7c1b246dcea
SHA256:	f1f34b7b798f8ec472b69eb5bd196381d749ced4d4a461d563896dfa827c84b6
Tags:	elfuser-abuse_ch
Infos:

Detection

Xmrig

Score:	84
Range:	0 - 100
Whitelisted:	false

Signatures

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Yara detected Xmrig cryptocurrency miner

Executes the "crontab" command typically for achieving persistence

Executes the "iptables" command to insert, remove and/or manipulate rules

Found strings related to Crypto-Mining

Sample is packed with UPX

Sample tries to persist itself using cron

ELF contains segments with high entropy indicating compressed/encrypted content

Enumerates processes within the "proc" file system

Executes commands using a shell command-line interpreter

Executes the "iptables" command used for managing IP filtering and manipulation

Reads system information from the proc file system

Reads the 'hosts' file potentially containing internal network hosts

Sample contains only a LOAD segment without any section mappings

Sample listens on a socket

Sample tries to kill a process (SIGKILL)

Uses the "uname" system call to query kernel version information (possible evasion)

Yara signature match

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1532424
Start date and time:	2024-10-13 07:12:05 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 27s
Hypervisor based Inspection enabled:	false
Report type:	full
Cookbook file name:	defaultlinuxfilecookbook.jbs
Analysis system description:	Ubuntu Linux 20.04 x64 (Kernel 5.4.0-72, Firefox 91.0, Evince Document Viewer 3.36.10, LibreOffice 6.4.7.2, OpenJDK 11.0.11)
Analysis Mode:	default
Sample name:	na.elf
Detection:	MAL
Classification:	mal84.troj.evad.mine.linELF@0/3@0/0

Warnings

Skipping network analysis since amount of network traffic is too extensive

Runtime Messages

Command:	/tmp/na.elf
PID:	5493
Exit Code:	0
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

na.elf (PID: 5493, Parent: 5413, MD5: 8087c36ad6c48d8871089112ba7e86c8) Arguments: /tmp/na.elf

na.elf New Fork (PID: 5494, Parent: 5493)

na.elf New Fork (PID: 5495, Parent: 5494)

sh (PID: 5495, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "command -v crontab >/dev/null 2>&1"

na.elf New Fork (PID: 5496, Parent: 5494)

sh (PID: 5496, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "crontab -r >/dev/null 2>&1; echo \"@reboot /tmp/na.elf\" | crontab -"

sh New Fork (PID: 5497, Parent: 5496)

crontab (PID: 5497, Parent: 5496, MD5: 66e521d421ac9b407699061bf21806f5) Arguments: crontab -r

sh New Fork (PID: 5498, Parent: 5496)

sh New Fork (PID: 5499, Parent: 5496)

crontab (PID: 5499, Parent: 5496, MD5: 66e521d421ac9b407699061bf21806f5) Arguments: crontab -

na.elf New Fork (PID: 5500, Parent: 5494)

sh (PID: 5500, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "command -v php >/dev/null 2>&1"

na.elf New Fork (PID: 5501, Parent: 5494)

sh (PID: 5501, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "command -v nginx >/dev/null 2>&1"

na.elf New Fork (PID: 5502, Parent: 5494)

sh (PID: 5502, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "which apache2"

sh New Fork (PID: 5503, Parent: 5502)

which (PID: 5503, Parent: 5502, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: which apache2

na.elf New Fork (PID: 5504, Parent: 5494)

sh (PID: 5504, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "which httpd"

sh New Fork (PID: 5505, Parent: 5504)

which (PID: 5505, Parent: 5504, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: which httpd

na.elf New Fork (PID: 5506, Parent: 5494)

na.elf New Fork (PID: 5509, Parent: 5494)

sh (PID: 5509, Parent: 5494, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: sh -c "iptables -I INPUT -p tcp --dport 50101 -j ACCEPT >/dev/null 2>&1"

sh New Fork (PID: 5510, Parent: 5509)

iptables (PID: 5510, Parent: 5509, MD5: 1ab05fef765b6342cdfadaa5275b33af) Arguments: iptables -I INPUT -p tcp --dport 50101 -j ACCEPT

cleanup

Malware Threat Intel

Provided by

Name	Description	Attribution	Blogpost URLs	Link
XMRIG		No Attribution	https://www.aquasec.com/blog/pg_mem-a-malware-hidden-in-the-postgres-processes/	https://malpedia.caad.fkie.fraunhofer.de/details/elf.xmrig

Yara Signatures

Memory Dumps

Source	Rule	Description	Author	Strings
5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	JoeSecurity_Xmrig	Yara detected Xmrig cryptocurrency miner	Joe Security
5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	Linux_Cryptominer_Camelot_b8552fff	unknown	unknown	0x83e52:$a: 18 8B 44 24 1C 8B 50 0C 83 E8 04 8B 0A FF 74 24 28 FF 74 24 28 FF 74 0x83e82:$a: 18 8B 44 24 1C 8B 50 0C 83 E8 04 8B 0A FF 74 24 28 FF 74 24 28 FF 74 0x83eb2:$a: 18 8B 44 24 1C 8B 50 0C 83 E8 04 8B 0A FF 74 24 28 FF 74 24 28 FF 74 0x83ee2:$a: 18 8B 44 24 1C 8B 50 0C 83 E8 04 8B 0A FF 74 24 28 FF 74 24 28 FF 74
Process Memory Space: na.elf PID: 5493	JoeSecurity_Xmrig	Yara detected Xmrig cryptocurrency miner	Joe Security

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: na.elf	ReversingLabs: Detection: 39%
Source: na.elf	Virustotal: Detection: 28%			Perma Link

Bitcoin Miner

Yara detected Xmrig cryptocurrency miner

Source: Yara match	File source: 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp, type: MEMORY
Source: Yara match	File source: Process Memory Space: na.elf PID: 5493, type: MEMORYSTR

Found strings related to Crypto-Mining

Source: na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	String found in binary or memory: stratum+ssl://randomx.xmrig.com:443
Source: na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	String found in binary or memory: cryptonight/0
Source: na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	String found in binary or memory: stratum+tcp://

Networking

Executes the "iptables" command to insert, remove and/or manipulate rules

Source: /bin/sh (PID: 5510)

Iptables executable using switch for changing the iptables rules: /usr/sbin/iptables -> iptables -I INPUT -p tcp --dport 50101 -j ACCEPT

Jump to behavior

Source: /bin/sh (PID: 5510)

Iptables executable: /usr/sbin/iptables -> iptables -I INPUT -p tcp --dport 50101 -j ACCEPT

Jump to behavior

Source: /tmp/na.elf (PID: 5494)

Reads hosts file: /etc/hosts

Jump to behavior

Source: /tmp/na.elf (PID: 5494)

Socket: 0.0.0.0:50101

Jump to behavior

Source: na.elf	String found in binary or memory: http://upx.sf.net
Source: na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	String found in binary or memory: https://gcc.gnu.org/bugs/):
Source: na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	String found in binary or memory: https://xmrig.com/wizard
Source: na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	String found in binary or memory: https://xmrig.com/wizard%s

System Summary

Malicious sample detected (through community Yara rule)

Source: 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp, type: MEMORY

Matched rule: Linux_Cryptominer_Camelot_b8552fff Author: unknown

Source: LOAD without section mappings

Program segment: 0x0

Source: /tmp/na.elf (PID: 5494)	SIGKILL sent: pid: 5473, result: successful			Jump to behavior
Source: /tmp/na.elf (PID: 5494)	SIGKILL sent: pid: 5513, result: successful			Jump to behavior

Source: 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp, type: MEMORY

Matched rule: Linux_Cryptominer_Camelot_b8552fff reference_sample = cdd3d567fbcbdd6799afad241ae29acbe4ab549445e5c4fc0678d16e75b40dfa, os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Cryptominer.Camelot, fingerprint = d5998e0bf7df96dd21d404658589fb37b405398bd3585275419169b30c72ce62, id = b8552fff-29a9-4e09-810a-b4b52a7a3fb4, last_modified = 2021-09-16

Source: classification engine

Classification label: mal84.troj.evad.mine.linELF@0/3@0/0

Data Obfuscation

Sample is packed with UPX

Source: initial sample	String containing UPX found: $Info: This file is packed with the UPX executable packer http://upx.sf.net $
Source: initial sample	String containing UPX found: $Info: This file is packed with the UPX executable packer http://upx.sf.net $
Source: initial sample	String containing UPX found: $Id: UPX 4.23 Copyright (C) 1996-2024 the UPX Team. All Rights Reserved. $

Persistence and Installation Behavior

Executes the "crontab" command typically for achieving persistence

Source: /bin/sh (PID: 5497)	Crontab executable: /usr/bin/crontab -> crontab -r			Jump to behavior
Source: /bin/sh (PID: 5499)	Crontab executable: /usr/bin/crontab -> crontab -			Jump to behavior

Executes the "iptables" command to insert, remove and/or manipulate rules

Source: /bin/sh (PID: 5510)

Iptables executable using switch for changing the iptables rules: /usr/sbin/iptables -> iptables -I INPUT -p tcp --dport 50101 -j ACCEPT

Jump to behavior

Sample tries to persist itself using cron

Source: /usr/bin/crontab (PID: 5499)	File: /var/spool/cron/crontabs/tmp.NT5FO0			Jump to behavior
Source: /usr/bin/crontab (PID: 5499)	File: /var/spool/cron/crontabs/root			Jump to behavior

Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3760/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3760/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3760/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3760/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3760/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3761/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3761/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3761/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3761/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3761/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1583/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1583/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1583/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1583/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1583/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/2672/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/2672/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/2672/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/2672/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/2672/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/110/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/110/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/110/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/110/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/110/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/110/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3759/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3759/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3759/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3759/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/3759/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/111/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/111/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/111/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/111/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/111/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/111/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/112/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/112/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/112/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/112/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/112/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/112/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/113/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/113/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/113/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/113/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/113/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/113/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/234/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/234/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/234/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/234/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/234/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/234/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1577/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1577/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1577/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1577/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/1577/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/114/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/114/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/114/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/114/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/114/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/114/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/235/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/235/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/235/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/235/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/235/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/235/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/115/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/115/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/115/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/115/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/115/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/115/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/116/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/116/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/116/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/116/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/116/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/116/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/117/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/117/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/117/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/117/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/117/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/117/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/118/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/118/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/118/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/118/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/118/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/118/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/119/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/119/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/119/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/119/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/119/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/119/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/10/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/10/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/10/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/10/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/10/cmdline	Jump to behavior
Source: /tmp/na.elf (PID: 5494)	File opened: /proc/10/cmdline	Jump to behavior

Source: /tmp/na.elf (PID: 5495)	Shell command executed: sh -c "command -v crontab >/dev/null 2>&1"	Jump to behavior
Source: /tmp/na.elf (PID: 5496)	Shell command executed: sh -c "crontab -r >/dev/null 2>&1; echo \"@reboot /tmp/na.elf\" \| crontab -"	Jump to behavior
Source: /tmp/na.elf (PID: 5500)	Shell command executed: sh -c "command -v php >/dev/null 2>&1"	Jump to behavior
Source: /tmp/na.elf (PID: 5501)	Shell command executed: sh -c "command -v nginx >/dev/null 2>&1"	Jump to behavior
Source: /tmp/na.elf (PID: 5502)	Shell command executed: sh -c "which apache2"	Jump to behavior
Source: /tmp/na.elf (PID: 5504)	Shell command executed: sh -c "which httpd"	Jump to behavior
Source: /tmp/na.elf (PID: 5509)	Shell command executed: sh -c "iptables -I INPUT -p tcp --dport 50101 -j ACCEPT >/dev/null 2>&1"	Jump to behavior

Source: /bin/sh (PID: 5510)

Iptables executable: /usr/sbin/iptables -> iptables -I INPUT -p tcp --dport 50101 -j ACCEPT

Jump to behavior

Source: /tmp/na.elf (PID: 5494)

Reads from proc file: /proc/meminfo

Jump to behavior

Source: na.elf	Submission file: segment LOAD with 7.8935 entropy (max. 8.0)
Source: na.elf	Submission file: segment LOAD with 7.9999 entropy (max. 8.0)

Source: /tmp/na.elf (PID: 5494)

Queries kernel information via 'uname':

Jump to behavior

Mitre Att&ck Matrix

Reconnaissance	Resource Development	Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Command and Control	Exfiltration	Impact
Gather Victim Identity Information	1 Scripting	Valid Accounts	1 Scheduled Task/Job	1 Scheduled Task/Job	1 Scheduled Task/Job	11 Obfuscated Files or Information	1 OS Credential Dumping	1 Security Software Discovery	Remote Services	Data from Local System	Data Obfuscation	Exfiltration Over Other Network Medium	Abuse Accessibility Features
Credentials	Domains	Default Accounts	Scheduled Task/Job	1 Scripting	Boot or Logon Initialization Scripts	Rootkit	LSASS Memory	1 File and Directory Discovery	Remote Desktop Protocol	Data from Removable Media	Junk Data	Exfiltration Over Bluetooth	Network Denial of Service
Email Addresses	DNS Server	Domain Accounts	At	Logon Script (Windows)	Logon Script (Windows)	Obfuscated Files or Information	Security Account Manager	1 System Information Discovery	SMB/Windows Admin Shares	Data from Network Shared Drive	Steganography	Automated Exfiltration	Data Encrypted for Impact
Employee Names	Virtual Private Server	Local Accounts	Cron	Login Hook	Login Hook	Binary Padding	NTDS	1 System Network Configuration Discovery	Distributed Component Object Model	Input Capture	Protocol Impersonation	Traffic Duplication	Data Destruction

Malware Configuration

⊘No configs have been found

Behavior Graph

Hide Legend

Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Number of created Files
Is malicious
Internet

Source	Detection	Scanner	Label	Link
na.elf	39%	ReversingLabs	Linux.Coinminer.Generic
na.elf	29%	Virustotal		Browse

Source	Detection	Scanner	Label	Link
https://gcc.gnu.org/bugs/):	0%	URL Reputation	safe
https://gcc.gnu.org/bugs/):	0%	URL Reputation	safe
http://upx.sf.net	0%	URL Reputation	safe
https://xmrig.com/wizard%s	2%	Virustotal		Browse
https://xmrig.com/wizard	2%	Virustotal		Browse

Name	Source	Malicious	Antivirus Detection	Reputation
https://gcc.gnu.org/bugs/):	na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	false	URL Reputation: safe URL Reputation: safe	unknown
http://upx.sf.net	na.elf	true	URL Reputation: safe	unknown
https://xmrig.com/wizard	na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	false	2%, Virustotal, Browse	unknown
https://xmrig.com/wizard%s	na.elf, 5493.1.00000000f7930000.00000000f7de0000.r-x.sdmp	false	2%, Virustotal, Browse	unknown

Process:	/tmp/na.elf
File Type:	very short file (no magic)
Category:	dropped
Size (bytes):	1
Entropy (8bit):	0.0
Encrypted:	false
SSDEEP:	3:W:W
MD5:	ECCBC87E4B5CE2FE28308FD9F2A7BAF3
SHA1:	77DE68DAECD823BABBB58EDB1C8E14D7106E83BB
SHA-256:	4E07408562BEDB8B60CE05C1DECFE3AD16B72230967DE01F640B7E4729B49FCE
SHA-512:	3BAFBF08882A2D10133093A1B8433F50563B93C14ACD05B79028EB1D12799027241450980651994501423A66C276AE26C43B739BC65C4E16B10C3AF6C202AEBB
Malicious:	false
Reputation:	moderate, very likely benign file
Preview:	3

/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

Download File

Process:	/tmp/na.elf
File Type:	ASCII text, with no line terminators
Category:	dropped
Size (bytes):	4
Entropy (8bit):	1.5
Encrypted:	false
SSDEEP:	3:MRV:Mz
MD5:	537D9B6C927223C796CAC288CCED29DF
SHA1:	EA10E810F96FCA6858E37FDA9832ACE147EED87C
SHA-256:	0D21AE129A64E1D19E4A94DFCA3A67C777E17374E9D4CA2F74B65647A88119EA
SHA-512:	6D4B04576201F789368F251EA231F5D2C0AE4CF17E95851D3AE10A1825724502732289F830E06247465F0284D4E33A9A120F6D730E62483515556DC1FD9CD120
Malicious:	false
Reputation:	moderate, very likely benign file
Preview:	1040

/var/spool/cron/crontabs/tmp.NT5FO0

Download File

Process:	/usr/bin/crontab
File Type:	ASCII text
Category:	dropped
Size (bytes):	195
Entropy (8bit):	5.113279828491398
Encrypted:	false
SSDEEP:	6:SUrpqoqQjEOP1KmREJOBFQ3pFOhZHGMQ5UYLtCFt3HY+z:8QjHig83+3eHLUHY+
MD5:	42F63B52A8C008CD051CC75A35D290B4
SHA1:	5AF923C65FE602F004705D5B85D401BB4EF81C0C
SHA-256:	343DDCF7DE59098401505D4716C1CAAD725665A8D90DB42B36A8113838E0F0C6
SHA-512:	67D0E0C290FF42E18DF06F445D6D90472F5BCF9314E792218089C1C9588B0EA19A065097B5A6116E194308C4D89E08E0390D03C0C2E5FB6E7ED2EA1E38C46622
Malicious:	true
Reputation:	low
Preview:	# DO NOT EDIT THIS FILE - edit the master and reinstall..# (- installed on Sun Oct 13 00:12:54 2024).# (Cron version -- $Id: crontab.c,v 2.13 1994/01/17 03:20:37 vixie Exp $).@reboot /tmp/na.elf.

Static File Info

General

File type:	ELF 32-bit LSB shared object, Intel 80386, version 1 (GNU/Linux), statically linked, no section header
Entropy (8bit):	7.999856524278898
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	na.elf
File size:	1'647'852 bytes
MD5:	8087c36ad6c48d8871089112ba7e86c8
SHA1:	f1cab2cf7c94b3b06f23f291d42bc7c1b246dcea
SHA256:	f1f34b7b798f8ec472b69eb5bd196381d749ced4d4a461d563896dfa827c84b6
SHA512:	b6f69551bbf8ba0dfe50aedcf222a457c829f0b47d4b14dd69de39721aa036c827b16bf903242773350b9cd00f3e059db6138adb20cb0d8981c3a73f80d47387
SSDEEP:	24576:iSOMGoq9mdCBgPcpjqnQ9KiDIGpjPEBNNKBDB2qejN8O4xuJsIu7FiiExxg25Kej:owVYqnQ9KSIKTqK7ejNz4UJsteEJs
TLSH:	D775337BD53D0A5EF635F4BC20A2442A4C13C5958C107FA98C763B2E6681C742A6FE7E
File Content Preview:	.ELF......................e.4...........4. .............................(.L...................L...L.."..."..........Q.td................................UPX!..........K.!.J.T...........<..?.E.`...X..)....r.}GK....6/....Q.Zl...S..7p......S...l..w....\...\..

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	Intel 80386
Version Number:	0x1
Type:	DYN (Shared object file)
OS/ABI:	UNIX - Linux
ABI Version:	0
Entry Point Address:	0x65dfb8
Flags:	0x0
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
Section Header Offset:	0
Section Header Size:	0
Number of Section Headers:	0
Header String Table Index:	0

Program Segments

Type	Offset	Virtual Address	Physical Address	File Size	Memory Size	Entropy	Flags	Flags Description	Align
LOAD	0x0	0x0	0x0	0x1000	0x4cce28	7.8935	0x6	RW	0x1000
LOAD	0x0	0x4cd000	0x4cd000	0x1922a1	0x1922a1	7.9999	0x5	R E	0x1000
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x6	RW	0x10

Network Behavior

⊘Skipped network analysis since the amount of network traffic is too extensive. Please download the PCAP and check manually.

System Behavior

Analysis Process: na.elf PID: 5493, Parent PID: 5413

General

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	/tmp/na.elf
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "command -v crontab >/dev/null 2>&1"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "crontab -r >/dev/null 2>&1; echo \"@reboot /tmp/na.elf\" \| crontab -"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/usr/bin/crontab
Arguments:	crontab -r
File size:	43720 bytes
MD5 hash:	66e521d421ac9b407699061bf21806f5

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Analysis Process: sh PID: 5499, Parent PID: 5496

General

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/usr/bin/crontab
Arguments:	crontab -
File size:	43720 bytes
MD5 hash:	66e521d421ac9b407699061bf21806f5

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "command -v php >/dev/null 2>&1"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "command -v nginx >/dev/null 2>&1"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "which apache2"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/usr/bin/which
Arguments:	which apache2
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "which httpd"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:54
Start date (UTC):	13/10/2024
Path:	/usr/bin/which
Arguments:	which httpd
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:12:55
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:13:00
Start date (UTC):	13/10/2024
Path:	/tmp/na.elf
Arguments:	-
File size:	1647852 bytes
MD5 hash:	8087c36ad6c48d8871089112ba7e86c8

Start time (UTC):	05:13:00
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	sh -c "iptables -I INPUT -p tcp --dport 50101 -j ACCEPT >/dev/null 2>&1"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:13:00
Start date (UTC):	13/10/2024
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	05:13:00
Start date (UTC):	13/10/2024
Path:	/usr/sbin/iptables
Arguments:	iptables -I INPUT -p tcp --dport 50101 -j ACCEPT
File size:	99296 bytes
MD5 hash:	1ab05fef765b6342cdfadaa5275b33af

Description:	This technique has been deprecated. Please use Command and Scripting Interpreter where appropriate.
Tactics:	Defense Evasion, Execution
Data Sources:
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may abuse task scheduling functionality to facilitate initial or recurring execution of malicious code. Utilities exist within all major operating systems to schedule programs or scripts to be executed at a specified date and time. A task can also be scheduled on a remote system, provided the proper authentication is met (ex: RPC and file and printer sharing in Windows environments). Scheduling a task on a remote system typically may require being a member of an admin or otherwise privileged group on the remote system.
Tactics:	Execution, Persistence, Privilege Escalation
Data Sources:	Command: Command Execution, Container: Container Creation, File: File Creation, File: File Modification, Process: Process Creation, Scheduled Job: Scheduled Job Creation
Platforms:	Containers, Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit. This is common behavior that can be used across different platforms and the network to evade defenses.
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Creation, File: File Metadata, Module: Module Load, Process: OS API Execution, Process: Process Creation, Script: Script Execution, WMI: WMI Creation, Windows Registry: Windows Registry Key Creation
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to dump credentials to obtain account login and credential material, normally in the form of a hash or a clear text password, from the operating system and software. Credentials can then be used to perform Lateral Movement and access restricted information.
Tactics:	Credential Access
Data Sources:	Active Directory: Active Directory Object Access, Command: Command Execution, File: File Access, Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow, Process: OS API Execution, Process: Process Access, Process: Process Creation, Windows Registry: Windows Registry Key Access
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus. Adversaries may use the information from Security Software Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	Command: Command Execution, Firewall: Firewall Enumeration, Firewall: Firewall Metadata, Process: OS API Execution, Process: Process Creation
Platforms:	Azure AD, Google Workspace, IaaS, Linux, macOS, Office 365, SaaS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system. Adversaries may use the information from File and Directory Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	Command: Command Execution, Process: OS API Execution, Process: Process Creation
Platforms:	Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and architecture. Adversaries may use the information from System Information Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	Command: Command Execution, Process: OS API Execution, Process: Process Creation
Platforms:	IaaS, Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may look for details about the network configuration and settings, such as IP and/or MAC addresses, of systems they access or through information discovery of remote systems. Several operating system administration utilities exist that can be used to gather this information. Examples include Arp , ipconfig / ifconfig , nbtstat , and route .
Tactics:	Discovery
Data Sources:	Command: Command Execution, Process: OS API Execution, Process: Process Creation, Script: Script Execution
Platforms:	Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

Loading Joe Sandbox Report ...

Warning!

Linux Analysis Report na.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Warnings

Runtime Messages

Process Tree

Malware Threat Intel

Yara Signatures

Memory Dumps

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Bitcoin Miner

Networking

System Summary

Data Obfuscation

Persistence and Installation Behavior

Hooking and other Techniques for Hiding and Protection

Malware Analysis System Evasion

Mitre Att&ck Matrix

Malware Configuration

Behavior Graph

Screenshots

Thumbnails

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Domains

URLs

Domains and IPs

Contacted Domains

URLs from Memory and Binaries

World Map of Contacted IPs

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

/sys/devices/system/node/node0/hugepages/hugepages-1048576kB/nr_hugepages

/sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages

/var/spool/cron/crontabs/tmp.NT5FO0

Static File Info

General

Static ELF Info

ELF header

Program Segments

Network Behavior

System Behavior

Analysis Process: na.elf PID: 5493, Parent PID: 5413

General

Chronological Activities

Analysis Process: na.elf PID: 5494, Parent PID: 5493

General

Chronological Activities

Analysis Process: na.elf PID: 5495, Parent PID: 5494

General

Chronological Activities

Analysis Process: sh PID: 5495, Parent PID: 5494

General

Chronological Activities

Analysis Process: na.elf PID: 5496, Parent PID: 5494

General

Chronological Activities

Analysis Process: sh PID: 5496, Parent PID: 5494

General

Chronological Activities

Analysis Process: sh PID: 5497, Parent PID: 5496

Linux Analysis Report
na.elf