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Linux Analysis Report
na.elf

Overview

General Information

Sample name:	na.elf
Analysis ID:	1528712
MD5:	d1b056c935bfdb4891603a4cffb62143
SHA1:	1bebe0db7bb1f9bccde522e9ddb62752eb833663
SHA256:	af1813f61ba9fc37810b7a94f4a5162f55640ea719552f61d9e09f4678dcb2b3
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)

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

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1528712
Start date and time:	2024-10-08 09:41:49 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 32s
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:	6268
Exit Code:	139
Exit Code Info:	SIGSEGV (11) Segmentation fault invalid memory reference
Killed:	False
Standard Output:
Standard Error:	qemu: uncaught target signal 11 (Segmentation fault) - core dumped

Process Tree

system is lnxubuntu20

dash New Fork (PID: 6241, Parent: 4333)

rm (PID: 6241, Parent: 4333, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.G4gqbMAAF5 /tmp/tmp.A9Q0SM8G6H /tmp/tmp.drh5UKVaiC

dash New Fork (PID: 6242, Parent: 4333)

rm (PID: 6242, Parent: 4333, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.G4gqbMAAF5 /tmp/tmp.A9Q0SM8G6H /tmp/tmp.drh5UKVaiC

na.elf (PID: 6268, Parent: 6171, MD5: 0d6f61f82cf2f781c6eb0661071d42d9) 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: 31%
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	TCP traffic detected without corresponding DNS query: 91.189.91.43

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: 0x100000

Source: classification engine

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

Source: /usr/bin/dash (PID: 6241)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.G4gqbMAAF5 /tmp/tmp.A9Q0SM8G6H /tmp/tmp.drh5UKVaiC			Jump to behavior
Source: /usr/bin/dash (PID: 6242)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.G4gqbMAAF5 /tmp/tmp.A9Q0SM8G6H /tmp/tmp.drh5UKVaiC			Jump to behavior

Source: na.elf

Submission file: segment LOAD with 7.9962 entropy (max. 8.0)

Source: /tmp/na.elf (PID: 6268)

Queries kernel information via 'uname':

Jump to behavior

Source: na.elf, 6268.1.000055970f280000.000055970f307000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/mipsel
Source: na.elf, 6268.1.00007ffdb8601000.00007ffdb8622000.rw-.sdmp	Binary or memory string: @x86_64/usr/bin/qemu-mipsel/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, 6268.1.000055970f280000.000055970f307000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/mipsel
Source: na.elf, 6268.1.00007ffdb8601000.00007ffdb8622000.rw-.sdmp	Binary or memory string: qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Source: na.elf, 6268.1.00007ffdb8601000.00007ffdb8622000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-mipsel

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	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	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	32%	ReversingLabs	Linux.Trojan.Generic
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	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	r3M3VGE5AG.elf	Get hash	malicious	Unknown	Browse
	l8XbwyLvrK.elf	Get hash	malicious	Mirai, Gafgyt	Browse
	arm7.elf	Get hash	malicious	Mirai	Browse
	SecuriteInfo.com.ELF.Mirai-CVD.31968.3467.elf	Get hash	malicious	Unknown	Browse
	SecuriteInfo.com.ELF.Mirai-CVD.12952.14309.elf	Get hash	malicious	Unknown	Browse
	SecuriteInfo.com.ELF.Mirai-COW.15022.10577.elf	Get hash	malicious	Unknown	Browse
	Mk4eUPwWIY.elf	Get hash	malicious	Mirai	Browse
91.189.91.42	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Mirai	Browse
	na.elf	Get hash	malicious	Unknown	Browse
	r3M3VGE5AG.elf	Get hash	malicious	Unknown	Browse
	l8XbwyLvrK.elf	Get hash	malicious	Mirai, Gafgyt	Browse
	arm7.elf	Get hash	malicious	Mirai	Browse
	SecuriteInfo.com.ELF.Mirai-CVD.31968.3467.elf	Get hash	malicious	Unknown	Browse
	SecuriteInfo.com.ELF.Mirai-CVD.12952.14309.elf	Get hash	malicious	Unknown	Browse
	SecuriteInfo.com.ELF.Mirai-COW.15022.10577.elf	Get hash	malicious	Unknown	Browse
	Mk4eUPwWIY.elf	Get hash	malicious	Mirai	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	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
	r3M3VGE5AG.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	l8XbwyLvrK.elf	Get hash	malicious	Mirai, Gafgyt	Browse	91.189.91.42
	arm7.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	x86.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	SecuriteInfo.com.ELF.Mirai-CVD.31968.3467.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	SecuriteInfo.com.ELF.Mirai-CVD.12952.14309.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
CANONICAL-ASGB	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
	r3M3VGE5AG.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	l8XbwyLvrK.elf	Get hash	malicious	Mirai, Gafgyt	Browse	91.189.91.42
	arm7.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	x86.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	SecuriteInfo.com.ELF.Mirai-CVD.31968.3467.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	SecuriteInfo.com.ELF.Mirai-CVD.12952.14309.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
INIT7CH	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
	r3M3VGE5AG.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	l8XbwyLvrK.elf	Get hash	malicious	Mirai, Gafgyt	Browse	109.202.202.202
	arm7.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	SecuriteInfo.com.ELF.Mirai-CVD.31968.3467.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	SecuriteInfo.com.ELF.Mirai-CVD.12952.14309.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	SecuriteInfo.com.ELF.Mirai-COW.15022.10577.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	Mk4eUPwWIY.elf	Get hash	malicious	Mirai	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, MIPS, MIPS-I version 1 (SYSV), statically linked, no section header
Entropy (8bit):	7.996218827957581
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	na.elf
File size:	55'024 bytes
MD5:	d1b056c935bfdb4891603a4cffb62143
SHA1:	1bebe0db7bb1f9bccde522e9ddb62752eb833663
SHA256:	af1813f61ba9fc37810b7a94f4a5162f55640ea719552f61d9e09f4678dcb2b3
SHA512:	acf368265b26078e2122be7532356fa3de70b7614e609e0c020d03b53bfc52a5efd5319cf945ac2f827363dbf712b8018b13d8d3a36ca75f05e7ff28c64e5d51
SSDEEP:	1536:m3LqE6rUQWzVQR7iAGEcUT5PIi7pLqBNs4LOjcwf4nH:mOE6PWo1T5bz4LVH
TLSH:	2D3302C7E9AA873DF4B6C9F84ED6C4440987022E7143B0AF468CA5BC24797951E5AF0F
File Content Preview:	.ELF.................... /..4...........4. ...(......................A...A....................G...G...................}l........................_..........?.E.h;....#....3.FR..gcpC....2.*..]8v. .....'..pw...rW.U.S.....(.\|W.H..?#.$0......m.r...U....:...&..

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	MIPS R3000
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x112f20
Flags:	0x1007
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	2
Section Header Offset:	0
Section Header Size:	40
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	Prog Interpreter	Section Mappings
LOAD	0x0	0x100000	0x100000	0x14195	0x14195	7.9962	0x5	R E	0x10000
LOAD	0xa5a0	0x47a5a0	0x47a5a0	0x0	0x0	0.0000	0x6	RW	0x10000

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Oct 8, 2024 09:42:38.178584099 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 8, 2024 09:42:43.809875965 CEST	42836	443	192.168.2.23	91.189.91.43
Oct 8, 2024 09:42:45.089690924 CEST	42516	80	192.168.2.23	109.202.202.202
Oct 8, 2024 09:42:59.423816919 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 8, 2024 09:43:09.662298918 CEST	42836	443	192.168.2.23	91.189.91.43
Oct 8, 2024 09:43:15.805418015 CEST	42516	80	192.168.2.23	109.202.202.202
Oct 8, 2024 09:43:40.378159046 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 8, 2024 09:44:00.855412960 CEST	42836	443	192.168.2.23	91.189.91.43

System Behavior

Analysis Process: dash PID: 6241, Parent PID: 4333

General

Start time (UTC):	07:42:32
Start date (UTC):	08/10/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6241, Parent PID: 4333

General

Start time (UTC):	07:42:32
Start date (UTC):	08/10/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.G4gqbMAAF5 /tmp/tmp.A9Q0SM8G6H /tmp/tmp.drh5UKVaiC
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: dash PID: 6242, Parent PID: 4333

General

Start time (UTC):	07:42:32
Start date (UTC):	08/10/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6242, Parent PID: 4333

General

Start time (UTC):	07:42:32
Start date (UTC):	08/10/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.G4gqbMAAF5 /tmp/tmp.A9Q0SM8G6H /tmp/tmp.drh5UKVaiC
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: na.elf PID: 6268, Parent PID: 6171

General

Start time (UTC):	07:42:36
Start date (UTC):	08/10/2024
Path:	/tmp/na.elf
Arguments:	/tmp/na.elf
File size:	5773336 bytes
MD5 hash:	0d6f61f82cf2f781c6eb0661071d42d9

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 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

Hooking and other Techniques for Hiding and Protection

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

Static ELF Info

ELF header

Program Segments

Network Behavior

Network Port Distribution

TCP Packets

System Behavior

Analysis Process: dash PID: 6241, Parent PID: 4333

General

Chronological Activities

Analysis Process: rm PID: 6241, Parent PID: 4333

General

Chronological Activities

Analysis Process: dash PID: 6242, Parent PID: 4333

General

Chronological Activities

Analysis Process: rm PID: 6242, Parent PID: 4333

General

Chronological Activities

Analysis Process: na.elf PID: 6268, Parent PID: 6171

General

Chronological Activities

Linux Analysis Report
na.elf