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Linux Analysis Report
fenty.arm4.elf

Overview

General Information

Sample name:	fenty.arm4.elf
Analysis ID:	1584364
MD5:	6ab5da16a9c7694bbf3e1e00922addd0
SHA1:	c3543908257537259bab3998b1c3e9ab0e335ce3
SHA256:	905a4f27b9131cfb4ea5518898eb6ae59580c715bc20d1c46f65933908a1251e
Tags:	elfuser-abuse_ch
Infos:

Detection

Mirai

Score:	72
Range:	0 - 100
Whitelisted:	false

Signatures

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Yara detected Mirai

Sample deletes itself

Sample is packed with UPX

ELF contains segments with high entropy indicating compressed/encrypted content

Sample contains only a LOAD segment without any section mappings

Sample contains strings indicative of BusyBox which embeds multiple Unix commands in a single executable

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)

Yara signature match

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1584364
Start date and time:	2025-01-05 09:32:06 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 12s
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:	fenty.arm4.elf
Detection:	MAL
Classification:	mal72.troj.evad.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/fenty.arm4.elf
PID:	5428
Exit Code:	1
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

fenty.arm4.elf (PID: 5428, Parent: 5351, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/fenty.arm4.elf

cleanup

Malware Threat Intel

Provided by

Name	Description	Attribution	Blogpost URLs	Link
Mirai	Mirai is one of the first significant botnets targeting exposed networking devices running Linux. Found in August 2016 by MalwareMustDie, its name means "future" in Japanese. Nowadays it targets a wide range of networked embedded devices such as IP cameras, home routers (many vendors involved), and other IoT devices. Since the source code was published on "Hack Forums" many variants of the Mirai family appeared, infecting mostly home networks all around the world.	No Attribution	http://osint.bambenekconsulting.com/feeds/ http://www.simonroses.com/2016/10/mirai-ddos-botnet-source-code-binary-analysis/ https://blog.malwaremustdie.org/2020/02/mmd-0065-2021-linuxmirai-fbot-re.html https://blog.netlab.360.com/another-lilin-dvr-0-day-being-used-to-spread-mirai-en/ https://blog.netlab.360.com/mirai_ptea-botnet-is-exploiting-undisclosed-kguard-dvr-vulnerability-en/	https://malpedia.caad.fkie.fraunhofer.de/details/elf.mirai

Yara Signatures

Memory Dumps

Source	Rule	Description	Author	Strings
5428.1.00007f2e5c017000.00007f2e5c029000.r-x.sdmp	JoeSecurity_Mirai_9	Yara detected Mirai	Joe Security
5428.1.00007f2e5c017000.00007f2e5c029000.r-x.sdmp	Mirai_Botnet_Malware	Detects Mirai Botnet Malware	Florian Roth	0x1034c:$x2: /dev/misc/watchdog 0x1033c:$x3: /dev/watchdog 0x10388:$x3: /dev/watchdog 0x104fc:$s1: LCOGQGPTGP

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: fenty.arm4.elf

ReversingLabs: Detection: 21%

Source: global traffic

TCP traffic: 192.168.2.13:48202 -> 185.125.190.26:443

Source: unknown	TCP traffic detected without corresponding DNS query: 185.125.190.26
Source: unknown	TCP traffic detected without corresponding DNS query: 185.125.190.26

Source: fenty.arm4.elf

String found in binary or memory: http://upx.sf.net

Source: unknown

Network traffic detected: HTTP traffic on port 48202 -> 443

System Summary

Malicious sample detected (through community Yara rule)

Source: 5428.1.00007f2e5c017000.00007f2e5c029000.r-x.sdmp, type: MEMORY

Matched rule: Detects Mirai Botnet Malware Author: Florian Roth

Source: LOAD without section mappings

Program segment: 0x8000

Source: Initial sample

String containing 'busybox' found: busybox

Source: 5428.1.00007f2e5c017000.00007f2e5c029000.r-x.sdmp, type: MEMORY

Matched rule: Mirai_Botnet_Malware date = 2016-10-04, hash5 = 420bf9215dfb04e5008c5e522eee9946599e2b323b17f17919cd802ebb012175, hash4 = 2efa09c124f277be2199bee58f49fc0ce6c64c0bef30079dfb3d94a6de492a69, hash3 = 20683ff7a5fec1237fc09224af40be029b9548c62c693844624089af568c89d4, hash2 = 05c78c3052b390435e53a87e3d31e9fb17f7c76bb4df2814313bca24735ce81c, hash1 = 05c78c3052b390435e53a87e3d31e9fb17f7c76bb4df2814313bca24735ce81c, author = Florian Roth, description = Detects Mirai Botnet Malware, hash10 = c61bf95146c68bfbbe01d7695337ed0e93ea759f59f651799f07eecdb339f83f, hash11 = d9573c3850e2ae35f371dff977fc3e5282a5e67db8e3274fd7818e8273fd5c89, hash12 = f1100c84abff05e0501e77781160d9815628e7fd2de9e53f5454dbcac7c84ca5, hash9 = bf0471b37dba7939524a30d7d5afc8fcfb8d4a7c9954343196737e72ea4e2dc4, hash8 = 89570ae59462e6472b6769545a999bde8457e47ae0d385caaa3499ab735b8147, hash7 = 70bb0ec35dd9afcfd52ec4e1d920e7045dc51dca0573cd4c753987c9d79405c0, hash6 = 62cdc8b7fffbaf5683a466f6503c03e68a15413a90f6afd5a13ba027631460c6, reference = Internal Research, license = https://creativecommons.org/licenses/by-nc/4.0/, hash13 = fb713ccf839362bf0fbe01aedd6796f4d74521b133011b408e42c1fd9ab8246b

Source: classification engine

Classification label: mal72.troj.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 3.94 Copyright (C) 1996-2017 the UPX Team. All Rights Reserved. $

Hooking and other Techniques for Hiding and Protection

Sample deletes itself

Source: /tmp/fenty.arm4.elf (PID: 5428)

File: /tmp/fenty.arm4.elf

Jump to behavior

Source: fenty.arm4.elf

Submission file: segment LOAD with 7.7431 entropy (max. 8.0)

Source: /tmp/fenty.arm4.elf (PID: 5428)

Queries kernel information via 'uname':

Jump to behavior

Source: fenty.arm4.elf, 5428.1.000055c4c9c50000.000055c4c9dbe000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/arm
Source: fenty.arm4.elf, 5428.1.000055c4c9c50000.000055c4c9dbe000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: fenty.arm4.elf, 5428.1.00007ffd11297000.00007ffd112b8000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm
Source: fenty.arm4.elf, 5428.1.00007ffd11297000.00007ffd112b8000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/fenty.arm4.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/fenty.arm4.elf

Stealing of Sensitive Information

Yara detected Mirai

Source: Yara match

File source: 5428.1.00007f2e5c017000.00007f2e5c029000.r-x.sdmp, type: MEMORY

Remote Access Functionality

Yara detected Mirai

Source: Yara match

File source: 5428.1.00007f2e5c017000.00007f2e5c029000.r-x.sdmp, type: MEMORY

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	11 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
fenty.arm4.elf	21%	ReversingLabs	Linux.Trojan.Mirai

Name	Source	Malicious	Antivirus Detection	Reputation
http://upx.sf.net	fenty.arm4.elf	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	Flag	ASN	ASN Name	Malicious
185.125.190.26	unknown	United Kingdom		41231	CANONICAL-ASGB	false

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link
185.125.190.26	a.elf	Get hash	malicious	Gafgyt	Browse
	176.119.150.11-i-2025-01-04T15_20_35.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	Space.ppc.elf	Get hash	malicious	Mirai	Browse
	la.bot.mipsel.elf	Get hash	malicious	Mirai	Browse
	185.232.205.45-boatnet.mips-2025-01-03T23_59_45.elf	Get hash	malicious	Mirai	Browse
	185.232.205.45-boatnet.m68k-2025-01-03T23_59_48.elf	Get hash	malicious	Mirai	Browse
	154.216.18.23-boatnet.arm-2025-01-03T11_40_59.elf	Get hash	malicious	Mirai	Browse
	arc.elf	Get hash	malicious	Unknown	Browse
	mips.elf	Get hash	malicious	Unknown	Browse
	i586.elf	Get hash	malicious	Mirai	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	fenty.arm6.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	fenty.arm5.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	h.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	c.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	a.elf	Get hash	malicious	Gafgyt	Browse	185.125.190.26
	Mozi.m.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	byte.mpsl.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	main_mips.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	i.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	sshd.elf	Get hash	malicious	Unknown	Browse	91.189.91.42

File type:	ELF 32-bit LSB executable, ARM, version 1 (ARM), statically linked, no section header
Entropy (8bit):	7.740108630199605
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	fenty.arm4.elf
File size:	33'864 bytes
MD5:	6ab5da16a9c7694bbf3e1e00922addd0
SHA1:	c3543908257537259bab3998b1c3e9ab0e335ce3
SHA256:	905a4f27b9131cfb4ea5518898eb6ae59580c715bc20d1c46f65933908a1251e
SHA512:	ca356198fd1743762479b40b2867d03147493796d26d6431d522aedfc926de2aea90851ca5b5402a8972b894f5ddb6bb5fc6798e56d62112cb87eaeb1c4cfa8a
SSDEEP:	768:abA+q5Nj3wTDfWkBZRMAJH5/Z5h+c4rl6/mZrHj8+Ce6JhLABdRx:abGNjYNTMAN5PhzyIgLX4Jhs/Rx
TLSH:	72E2D093E6631507DF8D9B7612BDC9FA89E737E94AC65E205CB1205750AF0E270278C8
File Content Preview:	.ELF...a..........(.........4...........4. ...(.....................K...K................:...:...:..................Q.td............................~..vUPX!X.......4...4.......[.........ELF.ra....(........4.....[... .................6.......l...h.....%...

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	ARM
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	ARM - ABI
ABI Version:	0
Entry Point Address:	0xfa10
Flags:	0x202
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
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
LOAD	0x0	0x8000	0x8000	0x834b	0x834b	7.7431	0x5	R E	0x8000
LOAD	0x3ab4	0x23ab4	0x23ab4	0x0	0x0	0.0000	0x6	RW	0x8000
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x7	RWE	0x4

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Jan 5, 2025 09:32:57.821954966 CET	48202	443	192.168.2.13	185.125.190.26
Jan 5, 2025 09:33:28.285837889 CET	48202	443	192.168.2.13	185.125.190.26

System Behavior

Analysis Process: fenty.arm4.elf PID: 5428, Parent PID: 5351

General

Start time (UTC):	08:32:43
Start date (UTC):	05/01/2025
Path:	/tmp/fenty.arm4.elf
Arguments:	/tmp/fenty.arm4.elf
File size:	4956856 bytes
MD5 hash:	5ebfcae4fe2471fcc5695c2394773ff1

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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Linux Analysis Report fenty.arm4.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Runtime Messages

Process Tree

Malware Threat Intel

Yara Signatures

Memory Dumps

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

Data Obfuscation

Hooking and other Techniques for Hiding and Protection

Malware Analysis System Evasion

Stealing of Sensitive Information

Remote Access Functionality

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: fenty.arm4.elf PID: 5428, Parent PID: 5351

General

Chronological Activities

Linux Analysis Report
fenty.arm4.elf