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Linux Analysis Report
na.elf

Overview

General Information

Sample name:	na.elf
Analysis ID:	1532116
MD5:	a584520e5cb34228eb7078903c862b93
SHA1:	283c7c8ad4d513694be6003ce332726fdf7b1d3c
SHA256:	f61ae304b8a9e1685ab8b0e7718df8fa7dad5829757616836d15b6183b8e8602
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100
Whitelisted:	false

Signatures

Multi AV Scanner detection for submitted file

Executes the "rm" command used to delete files or directories

Sample contains strings that are potentially command strings

Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)

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

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1532116
Start date and time:	2024-10-12 13:06:05 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 42s
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:	mal48.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/na.elf
PID:	6252
Exit Code:	135
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

dash New Fork (PID: 6223, Parent: 4331)

rm (PID: 6223, Parent: 4331, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.woJkVAa1Z6 /tmp/tmp.PjOycGhfr2 /tmp/tmp.tNpryRPH7p

dash New Fork (PID: 6224, Parent: 4331)

rm (PID: 6224, Parent: 4331, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.woJkVAa1Z6 /tmp/tmp.PjOycGhfr2 /tmp/tmp.tNpryRPH7p

na.elf (PID: 6252, Parent: 6158, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/na.elf

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

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

Virustotal: Detection: 21%

Perma Link

Source: global traffic	TCP traffic: 192.168.2.23:43928 -> 91.189.91.42:443
Source: global traffic	TCP traffic: 192.168.2.23:42836 -> 91.189.91.43:443
Source: global traffic	TCP traffic: 192.168.2.23:42516 -> 109.202.202.202:80

Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown	TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown	TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.42

Source: unknown	Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 42836 -> 443

Source: Initial sample	Potential command found: ssh server is locked, please try again %dmin after !!!
Source: Initial sample	Potential command found: X11 forwarding
Source: Initial sample	Potential command found: X11 forwarding disabled in user configuration file.
Source: Initial sample	Potential command found: X11 forwarding disabled in server configuration file.
Source: Initial sample	Potential command found: X11 display already set.
Source: Initial sample	Potential command found: X11 connection requested.
Source: Initial sample	Potential command found: X11 connection from %.200s port %d
Source: Initial sample	Potential command found: X11 connection rejected because of wrong authentication.
Source: Initial sample	Potential command found: X11 rejected %d i%d/o%d
Source: Initial sample	Potential command found: X11 closed %d i%d/o%d
Source: Initial sample	Potential command found: X11 inet listener
Source: Initial sample	Potential command found: X11 connection uses different authentication protocol.
Source: Initial sample	Potential command found: X11 auth data does not match fake data.
Source: Initial sample	Potential command found: X11 fake_data_len %d != saved_data_len %d

Source: classification engine

Classification label: mal48.linELF@0/0@0/0

Source: /usr/bin/dash (PID: 6223)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.woJkVAa1Z6 /tmp/tmp.PjOycGhfr2 /tmp/tmp.tNpryRPH7p			Jump to behavior
Source: /usr/bin/dash (PID: 6224)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.woJkVAa1Z6 /tmp/tmp.PjOycGhfr2 /tmp/tmp.tNpryRPH7p			Jump to behavior

Source: /tmp/na.elf (PID: 6252)

Queries kernel information via 'uname':

Jump to behavior

Source: na.elf, 6252.1.00007ffe1cb02000.00007ffe1cb23000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/na.elfSUDO_USER=saturninoPATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/binDISPLAY=:1.0XAUTHORITY=/run/user/1000/gdm/XauthoritySUDO_UID=1000TERM=xterm-256colorCOLORTERM=truecolorLOGNAME=rootUSER=rootLANG=en_US.UTF-8SUDO_COMMAND=/bin/bashHOME=/rootMAIL=/var/mail/rootSUDO_GID=1000SHELL=/bin/bash/tmp/na.elf
Source: na.elf, 6252.1.0000556efe720000.0000556efe82c000.rw-.sdmp	Binary or memory string: nU!/etc/qemu-binfmt/arm
Source: na.elf, 6252.1.0000556efe720000.0000556efe82c000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: na.elf, 6252.1.00007ffe1cb02000.00007ffe1cb23000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm
Source: na.elf, 6252.1.0000556efe720000.0000556efe82c000.rw-.sdmp	Binary or memory string: rg.qemu.gdb.arm.sys.regs">
Source: na.elf, 6252.1.0000556efe720000.0000556efe82c000.rw-.sdmp	Binary or memory string: nUrg.qemu.gdb.arm.sys.regs">

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	Acquire Infrastructure	Valid Accounts	1 Command and Scripting Interpreter	Path Interception	Path Interception	1 File Deletion	OS Credential Dumping	11 Security Software Discovery	Remote Services	Data from Local System	1 Encrypted Channel	Exfiltration Over Other Network Medium	Abuse Accessibility Features
Credentials	Domains	Default Accounts	Scheduled Task/Job	Boot or Logon Initialization Scripts	Boot or Logon Initialization Scripts	Rootkit	LSASS Memory	Application Window Discovery	Remote Desktop Protocol	Data from Removable Media	1 Application Layer Protocol	Exfiltration Over Bluetooth	Network Denial of Service

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

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
na.elf	22%	Virustotal		Browse

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Contacted Domains

⊘No contacted domains info

World Map of Contacted IPs

No. of IPs < 25%
25% < No. of IPs < 50%
50% < No. of IPs < 75%
75% < No. of IPs

Public IPs

IP	Domain	Country	ASN	ASN Name	Malicious
109.202.202.202	unknown	Switzerland	13030	INIT7CH	false
91.189.91.43	unknown	United Kingdom	41231	CANONICAL-ASGB	false
91.189.91.42	unknown	United Kingdom	41231	CANONICAL-ASGB	false

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
109.202.202.202	kpLwzBouH4.elf	Get hash	malicious	Unknown	Browse	ch.archive.ubuntu.com/ubuntu/pool/main/f/firefox/firefox_92.0%2bbuild3-0ubuntu0.20.04.1_amd64.deb
91.189.91.43	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	SecuriteInfo.com.Linux.Siggen.7706.4895.27444.elf	Get hash	malicious	Unknown	Browse
	kcJoyylDVl.elf	Get hash	malicious	Gafgyt, Mirai	Browse
91.189.91.42	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Unknown	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	185.125.190.26
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
CANONICAL-ASGB	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	185.125.190.26
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
INIT7CH	na.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	na.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	na.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	na.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	na.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Unknown	Browse	109.202.202.202

JA3 Fingerprints

⊘No context

Dropped Files

⊘No context

Created / dropped Files

⊘No created / dropped files found

Static File Info

General

File type:	ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, missing section headers at 1110264
Entropy (8bit):	6.1340626855449765
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	na.elf
File size:	1'029'119 bytes
MD5:	a584520e5cb34228eb7078903c862b93
SHA1:	283c7c8ad4d513694be6003ce332726fdf7b1d3c
SHA256:	f61ae304b8a9e1685ab8b0e7718df8fa7dad5829757616836d15b6183b8e8602
SHA512:	3717f3fb15558d665a61738e218d2ea994262f5b335ec527e744043c519744cba962ac788826533f14abed531db5b473bd1a42d41b890d76a6d7e1242a32d0b3
SSDEEP:	12288:00Bw2wHeeJgR3asIAksAi0uObzkzOgFr1qwRcFjV1D7a9KbsaKjpeFmz4Tj:00BnRED/TwOjX0a5xTj
TLSH:	88256C56F9808FA2C5D8177BBB5DC35833134B78D7DEB102CD08672477AA94A0E7B982
File Content Preview:	.ELF..............(......d..4...p.......4. ...(........pl...l...l.......................4...4...4... ... ...............T...T...T...................................x...x...........................0....m..........................(...(...............p...p..

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Oct 12, 2024 13:06:53.125648022 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 12, 2024 13:06:58.500838041 CEST	42836	443	192.168.2.23	91.189.91.43
Oct 12, 2024 13:06:59.268848896 CEST	42516	80	192.168.2.23	109.202.202.202
Oct 12, 2024 13:07:13.090960979 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 12, 2024 13:07:25.377271891 CEST	42836	443	192.168.2.23	91.189.91.43
Oct 12, 2024 13:07:29.472706079 CEST	42516	80	192.168.2.23	109.202.202.202
Oct 12, 2024 13:07:54.045237064 CEST	43928	443	192.168.2.23	91.189.91.42

System Behavior

Analysis Process: dash PID: 6223, Parent PID: 4331

General

Start time (UTC):	11:06:48
Start date (UTC):	12/10/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6223, Parent PID: 4331

General

Start time (UTC):	11:06:48
Start date (UTC):	12/10/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.woJkVAa1Z6 /tmp/tmp.PjOycGhfr2 /tmp/tmp.tNpryRPH7p
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: dash PID: 6224, Parent PID: 4331

General

Start time (UTC):	11:06:48
Start date (UTC):	12/10/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6224, Parent PID: 4331

General

Start time (UTC):	11:06:48
Start date (UTC):	12/10/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.woJkVAa1Z6 /tmp/tmp.PjOycGhfr2 /tmp/tmp.tNpryRPH7p
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: na.elf PID: 6252, Parent PID: 6158

General

Start time (UTC):	11:06:53
Start date (UTC):	12/10/2024
Path:	/tmp/na.elf
Arguments:	/tmp/na.elf
File size:	4956856 bytes
MD5 hash:	5ebfcae4fe2471fcc5695c2394773ff1

Description:	Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell .
Tactics:	Execution
Data Sources:	Command: Command Execution, Module: Module Load, Process: Process Creation, Process: Process Metadata, Script: Script Execution
Platforms:	Azure AD, Google Workspace, IaaS, Linux, macOS, Network, Office 365, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may delete files left behind by the actions of their intrusion activity. Malware, tools, or other non-native files dropped or created on a system by an adversary (ex: Ingress Tool Transfer ) may leave traces to indicate to what was done within a network and how. Removal of these files can occur during an intrusion, or as part of a post-intrusion process to minimize the adversary's footprint.
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Deletion
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 employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol. Despite the use of a secure algorithm, these implementations may be vulnerable to reverse engineering if secret keys are encoded and/or generated within malware samples/configuration files.
Tactics:	Command and Control
Data Sources:	Network Traffic: Network Traffic Content
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may communicate using OSI application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
Tactics:	Command and Control
Data Sources:	Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

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Warning!

Linux Analysis Report na.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Runtime Messages

Process Tree

Yara Signatures

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

Persistence and Installation Behavior

Malware Analysis System Evasion

Mitre Att&ck Matrix

Malware Configuration

Behavior Graph

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Domains

URLs

Domains and IPs

Contacted Domains

World Map of Contacted IPs

Public IPs

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

Network Behavior

Network Port Distribution

TCP Packets

System Behavior

Analysis Process: dash PID: 6223, Parent PID: 4331

General

Chronological Activities

Analysis Process: rm PID: 6223, Parent PID: 4331

General

Chronological Activities

Analysis Process: dash PID: 6224, Parent PID: 4331

General

Chronological Activities

Analysis Process: rm PID: 6224, Parent PID: 4331

General

Chronological Activities

Analysis Process: na.elf PID: 6252, Parent PID: 6158

General

Chronological Activities

Linux Analysis Report
na.elf