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Linux Analysis Report
na.elf

Overview

General Information

Sample name:	na.elf
Analysis ID:	1580690
MD5:	4782844a8ea85b12c3817eebc939b59d
SHA1:	c7bc0876bf2492e90589e6eeb92fe72a8aa49ece
SHA256:	8ec6a18a4ab50c4dcc1d91d75862a65ab437a1639e97cf508564b2c194334162
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100
Whitelisted:	false

Signatures

Multi AV Scanner detection for submitted file

ELF contains segments with high entropy indicating compressed/encrypted content

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

Sample contains only a LOAD segment without any section mappings

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

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1580690
Start date and time:	2024-12-25 17:07:09 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 31s
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:	6274
Exit Code:	135
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

dash New Fork (PID: 6246, Parent: 4331)

rm (PID: 6246, Parent: 4331, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.O4Bg5L9bO2 /tmp/tmp.kurWRVItda /tmp/tmp.k4pdAHbT5N

dash New Fork (PID: 6247, Parent: 4331)

rm (PID: 6247, Parent: 4331, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.O4Bg5L9bO2 /tmp/tmp.kurWRVItda /tmp/tmp.k4pdAHbT5N

na.elf (PID: 6274, Parent: 6175, MD5: 4782844a8ea85b12c3817eebc939b59d) 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

ReversingLabs: Detection: 13%

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: LOAD without section mappings

Program segment: 0x0

Source: classification engine

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

Source: /usr/bin/dash (PID: 6246)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.O4Bg5L9bO2 /tmp/tmp.kurWRVItda /tmp/tmp.k4pdAHbT5N			Jump to behavior
Source: /usr/bin/dash (PID: 6247)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.O4Bg5L9bO2 /tmp/tmp.kurWRVItda /tmp/tmp.k4pdAHbT5N			Jump to behavior

Source: na.elf

Submission file: segment LOAD with 7.8722 entropy (max. 8.0)

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	Windows Management Instrumentation	Path Interception	Path Interception	1 Obfuscated Files or Information	OS Credential Dumping	System Service 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	1 File Deletion	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	13%	ReversingLabs	Linux.Trojan.Generic

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	boatnet.ppc.elf	Get hash	malicious	Mirai	Browse
	boatnet.arc.elf	Get hash	malicious	Mirai	Browse
	boatnet.m68k.elf	Get hash	malicious	Mirai	Browse
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse
	xd.x86_64.elf	Get hash	malicious	Mirai	Browse
	159.100.14.33-boatnet.arm-2024-12-25T14_31_19.elf	Get hash	malicious	Mirai	Browse
	armv4eb.elf	Get hash	malicious	Mirai	Browse
	m68k.elf	Get hash	malicious	Mirai, Moobot	Browse
	win.elf	Get hash	malicious	Unknown	Browse
	165.3.86.135-mips-2024-12-25T09_39_46.elf	Get hash	malicious	Mirai, Moobot	Browse
91.189.91.42	boatnet.ppc.elf	Get hash	malicious	Mirai	Browse
	boatnet.arc.elf	Get hash	malicious	Mirai	Browse
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse
	boatnet.m68k.elf	Get hash	malicious	Mirai	Browse
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse
	xd.x86_64.elf	Get hash	malicious	Mirai	Browse
	159.100.14.33-boatnet.arm-2024-12-25T14_31_19.elf	Get hash	malicious	Mirai	Browse
	armv4eb.elf	Get hash	malicious	Mirai	Browse
	m68k.elf	Get hash	malicious	Mirai, Moobot	Browse
	spc.elf	Get hash	malicious	Mirai, Moobot	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	boatnet.ppc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.arc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.m68k.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	xd.x86_64.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	159.100.14.33-boatnet.arm-2024-12-25T14_31_19.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	159.100.14.33-boatnet.arm7-2024-12-25T14_32_39.elf	Get hash	malicious	Mirai	Browse	185.125.190.26
	armv4eb.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	m68k.elf	Get hash	malicious	Mirai, Moobot	Browse	91.189.91.42
CANONICAL-ASGB	boatnet.ppc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.arc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.m68k.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	xd.x86_64.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	159.100.14.33-boatnet.arm-2024-12-25T14_31_19.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	159.100.14.33-boatnet.arm7-2024-12-25T14_32_39.elf	Get hash	malicious	Mirai	Browse	185.125.190.26
	armv4eb.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	m68k.elf	Get hash	malicious	Mirai, Moobot	Browse	91.189.91.42
INIT7CH	boatnet.ppc.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	boatnet.arc.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	boatnet.m68k.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	xd.x86_64.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	159.100.14.33-boatnet.arm-2024-12-25T14_31_19.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	armv4eb.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	m68k.elf	Get hash	malicious	Mirai, Moobot	Browse	109.202.202.202
	arm6.elf	Get hash	malicious	Mirai, Moobot	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 64-bit LSB shared object, x86-64, version 1 (SYSV), statically linked, no section header
Entropy (8bit):	7.8721569420313315
TrID:	ELF Executable and Linkable format (Linux) (4029/14) 50.16% ELF Executable and Linkable format (generic) (4004/1) 49.84%
File name:	na.elf
File size:	4'087'579 bytes
MD5:	4782844a8ea85b12c3817eebc939b59d
SHA1:	c7bc0876bf2492e90589e6eeb92fe72a8aa49ece
SHA256:	8ec6a18a4ab50c4dcc1d91d75862a65ab437a1639e97cf508564b2c194334162
SHA512:	a9f30e50f608ac77e7d7ec6826de3f396f7515add70f86753f1657e2568c2def38b01d437fb40e5d4f4c8ef2960e13874be4377e401331f176bfde2b8bb26a3d
SSDEEP:	98304:AM2q2QYxxQMmT3BpeX2H3PxpclB4yiJyfLeLJ2+lV:n2q25/e3TemfjY4LkfLYV
TLSH:	6B163325072E7AA308E21F03C4B92640AA51F15874EC95996F92F31FF235DFB4724A7E
File Content Preview:	.ELF..............>.....hCM.....@...................@.8...@......................................LM......LM..............................PM......PM.............0;..............Q.td.....................................................>U.UPX!.........!...!.

Static ELF Info

ELF header
Class:	ELF64
Data:	2's complement, little endian
Version:	1 (current)
Machine:	Advanced Micro Devices X86-64
Version Number:	0x1
Type:	DYN (Shared object file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x4d4368
Flags:	0x0
ELF Header Size:	64
Program Header Offset:	64
Program Header Size:	56
Number of Program Headers:	3
Section Header Offset:	0
Section Header Size:	64
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	0x4d4ce0	0x4d4ce0	7.8722	0x5	R E	0x1000
LOAD	0x0	0x4d5000	0x4d5000	0x0	0x8d3b30	0.0000	0x6	RW	0x1000
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x6	RW	0x10

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Dec 25, 2024 17:07:56.416301012 CET	43928	443	192.168.2.23	91.189.91.42
Dec 25, 2024 17:08:02.047612906 CET	42836	443	192.168.2.23	91.189.91.43
Dec 25, 2024 17:08:02.815524101 CET	42516	80	192.168.2.23	109.202.202.202
Dec 25, 2024 17:08:16.637655973 CET	43928	443	192.168.2.23	91.189.91.42
Dec 25, 2024 17:08:28.924007893 CET	42836	443	192.168.2.23	91.189.91.43
Dec 25, 2024 17:08:33.019382000 CET	42516	80	192.168.2.23	109.202.202.202
Dec 25, 2024 17:08:57.591959953 CET	43928	443	192.168.2.23	91.189.91.42

System Behavior

Analysis Process: dash PID: 6246, Parent PID: 4331

General

Start time (UTC):	16:07:53
Start date (UTC):	25/12/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6246, Parent PID: 4331

General

Start time (UTC):	16:07:53
Start date (UTC):	25/12/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.O4Bg5L9bO2 /tmp/tmp.kurWRVItda /tmp/tmp.k4pdAHbT5N
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: dash PID: 6247, Parent PID: 4331

General

Start time (UTC):	16:07:53
Start date (UTC):	25/12/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6247, Parent PID: 4331

General

Start time (UTC):	16:07:53
Start date (UTC):	25/12/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.O4Bg5L9bO2 /tmp/tmp.kurWRVItda /tmp/tmp.k4pdAHbT5N
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: na.elf PID: 6274, Parent PID: 6175

General

Start time (UTC):	16:07:55
Start date (UTC):	25/12/2024
Path:	/tmp/na.elf
Arguments:	/tmp/na.elf
File size:	4087579 bytes
MD5 hash:	4782844a8ea85b12c3817eebc939b59d

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 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 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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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

Hooking and other Techniques for Hiding and Protection

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

Static ELF Info

ELF header

Program Segments

Network Behavior

Network Port Distribution

TCP Packets

System Behavior

Analysis Process: dash PID: 6246, Parent PID: 4331

General

Chronological Activities

Analysis Process: rm PID: 6246, Parent PID: 4331

General

Chronological Activities

Analysis Process: dash PID: 6247, Parent PID: 4331

General

Chronological Activities

Analysis Process: rm PID: 6247, Parent PID: 4331

General

Chronological Activities

Analysis Process: na.elf PID: 6274, Parent PID: 6175

General

Linux Analysis Report
na.elf