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Linux Analysis Report
linux.elf

Overview

General Information

Sample name:	linux.elf
Analysis ID:	1674634
MD5:	3214e7da3a50b13260b5f9c24556ae46
SHA1:	bc7ee9e5bb27cfaa3f7c3231222fb56efa36e9b4
SHA256:	e6bbc3fe61ccb51576d7786b8f5d68d3adf8355684a033bbb41d14a99ade5b56
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	52
Range:	0 - 100

Signatures

Multi AV Scanner detection for submitted file

Sample is packed with UPX

Creates hidden files and/or directories

ELF contains segments with high entropy indicating compressed/encrypted content

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:	42.0.0 Malachite
Analysis ID:	1674634
Start date and time:	2025-04-26 07:08:17 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 30s
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:	linux.elf
Detection:	MAL
Classification:	mal52.evad.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/linux.elf
PID:	6242
Exit Code:	0
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

linux.elf (PID: 6242, Parent: 6167, MD5: 3214e7da3a50b13260b5f9c24556ae46) Arguments: /tmp/linux.elf

linux.elf New Fork (PID: 6243, Parent: 6242)

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

• AV Detection
• Networking
• System Summary
• Data Obfuscation
• Persistence and Installation Behavior
• Hooking and other Techniques for Hiding and Protection

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: linux.elf	Virustotal: Detection: 21%			Perma Link
Source: linux.elf	ReversingLabs: Detection: 41%

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: linux.elf	String found in binary or memory: http://upx.sf.net
Source: linux.elf, 6243.1.0000000000400000.0000000000b74000.r-x.sdmp	String found in binary or memory: https://docs.rs/getrandom#nodejs-es-module-support/dev/urandom
Source: linux.elf, 6242.1.0000000000400000.0000000000b74000.r-x.sdmp, linux.elf, 6243.1.0000000000400000.0000000000b74000.r-x.sdmp	String found in binary or memory: https://docs.rs/getrandom#nodejs-es-module-support/dev/urandom/dev/randomMalformed
Source: linux.elf, 6242.1.0000000000400000.0000000000b74000.r-x.sdmp, linux.elf, 6243.1.0000000000400000.0000000000b74000.r-x.sdmp	String found in binary or memory: https://docs.rs/getrandom#nodejs-es-module-support/dev/urandom/dev/randomlenBadOffsetIOMalformedScro

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: 0x400000

Source: classification engine

Classification label: mal52.evad.linELF@0/0@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 4.02 Copyright (C) 1996-2023 the UPX Team. All Rights Reserved. $

Source: /tmp/linux.elf (PID: 6243)	Directory: /proc/.			Jump to behavior
Source: /tmp/linux.elf (PID: 6243)	Directory: /proc/6243/.			Jump to behavior

Source: linux.elf	Submission file: segment LOAD with 7.5961 entropy (max. 8.0)
Source: linux.elf	Submission file: segment LOAD with 7.9491 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 Hidden Files and Directories	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	11 Obfuscated Files or Information	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
linux.elf	22%	Virustotal		Browse
linux.elf	42%	ReversingLabs	Linux.Trojan.Multiverze

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Download Network PCAP: filtered – full

Contacted Domains

⊘No contacted domains info

URLs from Memory and Binaries

Name	Source	Malicious	Reputation
http://upx.sf.net	linux.elf	false	high
https://docs.rs/getrandom#nodejs-es-module-support/dev/urandom/dev/randomMalformed	linux.elf, 6242.1.0000000000400000.0000000000b74000.r-x.sdmp, linux.elf, 6243.1.0000000000400000.0000000000b74000.r-x.sdmp	false	high
https://docs.rs/getrandom#nodejs-es-module-support/dev/urandom/dev/randomlenBadOffsetIOMalformedScro	linux.elf, 6242.1.0000000000400000.0000000000b74000.r-x.sdmp, linux.elf, 6243.1.0000000000400000.0000000000b74000.r-x.sdmp	false	high
https://docs.rs/getrandom#nodejs-es-module-support/dev/urandom	linux.elf, 6243.1.0000000000400000.0000000000b74000.r-x.sdmp	false	high

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	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	S95baby.sh.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
91.189.91.42	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	S95baby.sh.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	S95baby.sh.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	185.125.190.26
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	185.125.190.26
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
CANONICAL-ASGB	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	S95baby.sh.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	185.125.190.26
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	185.125.190.26
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
INIT7CH	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	S95baby.sh.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	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 executable, x86-64, version 1 (SYSV), statically linked, no section header
Entropy (8bit):	7.949072039275612
TrID:	ELF Executable and Linkable format (Linux) (4029/14) 50.16% ELF Executable and Linkable format (generic) (4004/1) 49.84%
File name:	linux.elf
File size:	3'610'344 bytes
MD5:	3214e7da3a50b13260b5f9c24556ae46
SHA1:	bc7ee9e5bb27cfaa3f7c3231222fb56efa36e9b4
SHA256:	e6bbc3fe61ccb51576d7786b8f5d68d3adf8355684a033bbb41d14a99ade5b56
SHA512:	d3ad5ce2f66227c864cfc03af34efc0328d9c4b9e7323630e9d0e7355302345084a865b36fd6ba265d2d3bf5ea35b27fd56f7702a73af3d8f0168e5882fd324b
SSDEEP:	98304:bD/5IVaPY06J3Rh3Vc4smM/THIVvcDUh6+8zgNmHaZ2FTi:P5IVaq3rVamM/jPzgU1Ti
TLSH:	75F533EC8EBE6AE9341CC7BC35B8534075A86C7A09DC48D16BBEC6071631AD5A7C2371
File Content Preview:	.ELF..............>.....89......@...................@.8...........................@.......@..............................................0.......0........7.......7.............Q.td....................................................#...UPX!..........~..4w

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:	EXEC (Executable file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x1163938
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:	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	0x400000	0x400000	0x1000	0x9f2ed8	7.5961	0x6	RW	0x1000
LOAD	0x0	0xdf3000	0xdf3000	0x3713fe	0x3713fe	7.9491	0x5	R E	0x1000
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x6	RW	0x10

Network Behavior

Download Network PCAP: filtered – full

Network Port Distribution

Total Packets: 8
• 443 (HTTPS)
• 80 (HTTP)

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Apr 26, 2025 07:09:05.094111919 CEST	43928	443	192.168.2.23	91.189.91.42
Apr 26, 2025 07:09:10.725298882 CEST	42836	443	192.168.2.23	91.189.91.43
Apr 26, 2025 07:09:11.749114990 CEST	42516	80	192.168.2.23	109.202.202.202
Apr 26, 2025 07:09:26.339008093 CEST	43928	443	192.168.2.23	91.189.91.42
Apr 26, 2025 07:09:36.577548981 CEST	42836	443	192.168.2.23	91.189.91.43
Apr 26, 2025 07:09:42.720690012 CEST	42516	80	192.168.2.23	109.202.202.202
Apr 26, 2025 07:10:07.293107986 CEST	43928	443	192.168.2.23	91.189.91.42
Apr 26, 2025 07:10:27.770087957 CEST	42836	443	192.168.2.23	91.189.91.43

System Behavior

Analysis Process: linux.elf PID: 6242, Parent PID: 6167

General

Start time (UTC):	05:09:02
Start date (UTC):	26/04/2025
Path:	/tmp/linux.elf
Arguments:	/tmp/linux.elf
File size:	3610344 bytes
MD5 hash:	3214e7da3a50b13260b5f9c24556ae46

File Activities

File Opened

Process Activities

Process Forked

Chronological Activities

Analysis Process: linux.elf PID: 6243, Parent PID: 6242

General

Start time (UTC):	05:09:02
Start date (UTC):	26/04/2025
Path:	/tmp/linux.elf
Arguments:	-
File size:	3610344 bytes
MD5 hash:	3214e7da3a50b13260b5f9c24556ae46

Description:	Adversaries may set files and directories to be hidden to evade detection mechanisms. To prevent normal users from accidentally changing special files on a system, most operating systems have the concept of a ‘hidden’ file. These files don’t show up when a user browses the file system with a GUI or when using normal commands on the command line. Users must explicitly ask to show the hidden files either via a series of Graphical User Interface (GUI) prompts or with command line switches ( `dir /a` for Windows and `ls –a` for Linux and macOS).
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Creation, File: File Metadata, Process: Process Creation
Platforms:	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 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 linux.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

Data Obfuscation

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

URLs from Memory and Binaries

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: linux.elf PID: 6242, Parent PID: 6167

General

File Activities

File Opened

Process Activities

Process Forked

Chronological Activities

Analysis Process: linux.elf PID: 6243, Parent PID: 6242

General

File Activities

File Opened

File Read

File Moved

Directory Enumerated

Process Activities

Prctl Requested

Chronological Activities

Linux Analysis Report
linux.elf