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Linux Analysis Report
x86.elf

Overview

General Information

Sample name:	x86.elf
Analysis ID:	1541825
MD5:	6c5f14de57bc36a6fa22bbf554e8049f
SHA1:	6422fa0c77161c15298af285be511e5b3cef6e3c
SHA256:	78b479fc15b2171a97a082f840f4c130158ee5033ba933247eb4d98ab8fc4122
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	52
Range:	0 - 100
Whitelisted:	false

Signatures

Malicious sample detected (through community Yara rule)

Machine Learning detection for sample

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)

Yara signature match

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1541825
Start date and time:	2024-10-25 08:08:05 +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:	x86.elf
Detection:	MAL
Classification:	mal52.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/x86.elf
PID:	6209
Exit Code:	0
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

x86.elf (PID: 6209, Parent: 6129, MD5: 6c5f14de57bc36a6fa22bbf554e8049f) Arguments: /tmp/x86.elf

cleanup

Yara Signatures

Memory Dumps

Source	Rule	Description	Author	Strings
6209.1.0000000008048000.0000000008052000.r-x.sdmp	Linux_Trojan_Gafgyt_e6d75e6f	unknown	unknown	0x4abe:$a: 00 00 00 CD 80 C3 8B 54 24 04 8B 4C 24 08 87 D3 B8 5B 00 00 00
6209.1.0000000008048000.0000000008052000.r-x.sdmp	Linux_Trojan_Mirai_122ff2e6	unknown	unknown	0x2dd3:$a: 24 EB 15 89 F0 83 C8 01 EB 03 8B 5B 08 3B 43 04 72 F8 8B 4B 0C 89
6209.1.0000000008048000.0000000008052000.r-x.sdmp	Linux_Trojan_Mirai_fa48b592	unknown	unknown	0x75c5:$a: 31 C0 BA 01 00 00 00 B9 01 00 00 00 03 04 24 89 D7 31 D2 F7 F7 0F

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Machine Learning detection for sample

Source: x86.elf

Joe Sandbox ML: detected

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

System Summary

Malicious sample detected (through community Yara rule)

Source: 6209.1.0000000008048000.0000000008052000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Gafgyt_e6d75e6f Author: unknown
Source: 6209.1.0000000008048000.0000000008052000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_122ff2e6 Author: unknown
Source: 6209.1.0000000008048000.0000000008052000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_fa48b592 Author: unknown

Source: LOAD without section mappings

Program segment: 0x8048000

Source: 6209.1.0000000008048000.0000000008052000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Gafgyt_e6d75e6f reference_sample = 48b15093f33c18778724c48c34199a420be4beb0d794e36034097806e1521eb8, os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = e99805e8917d6526031270b6da5c2f3cc1c8235fed1d47134835a107d0df497c, id = e6d75e6f-aa04-4767-8730-6909958044a7, last_modified = 2021-09-16
Source: 6209.1.0000000008048000.0000000008052000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_122ff2e6 reference_sample = c7dd999a033fa3edc1936785b87cd69ce2f5cac5a084ddfaf527a1094e718bc4, os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Mirai, fingerprint = 3c9ffd7537e30a21eefa6c174f801264b92a85a1bc73e34e6dc9e29f84658348, id = 122ff2e6-56e6-4aa8-a3ec-c19d31eb1f80, last_modified = 2021-09-16
Source: 6209.1.0000000008048000.0000000008052000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_fa48b592 reference_sample = c9e33befeec133720b3ba40bb3cd7f636aad80f72f324c5fe65ac7af271c49ee, os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Mirai, fingerprint = 8838d2752b310dbf7d12f6cf023244aaff4fdf5b55cf1e3b71843210df0fcf88, id = fa48b592-8d80-45af-a3e4-232695b8f5dd, last_modified = 2021-09-16

Source: classification engine

Classification label: mal52.linELF@0/0@0/0

Source: x86.elf	Submission file: segment LOAD with 7.6812 entropy (max. 8.0)
Source: x86.elf	Submission file: segment LOAD with 7.8626 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	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
x86.elf	5%	Virustotal		Browse
x86.elf	100%	Joe Sandbox ML

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	m68k.elf	Get hash	malicious	Unknown	Browse
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse
	x86.elf	Get hash	malicious	Unknown	Browse
	la.bot.arm7.elf	Get hash	malicious	Unknown	Browse
	x86.elf	Get hash	malicious	Unknown	Browse
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse
	x86.elf	Get hash	malicious	Unknown	Browse
	.i.elf	Get hash	malicious	Unknown	Browse
	arm5.elf	Get hash	malicious	Unknown	Browse
	m68k.elf	Get hash	malicious	Unknown	Browse
91.189.91.42	m68k.elf	Get hash	malicious	Unknown	Browse
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse
	x86.elf	Get hash	malicious	Unknown	Browse
	la.bot.arm7.elf	Get hash	malicious	Unknown	Browse
	x86.elf	Get hash	malicious	Unknown	Browse
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse
	x86.elf	Get hash	malicious	Unknown	Browse
	.i.elf	Get hash	malicious	Unknown	Browse
	arm5.elf	Get hash	malicious	Unknown	Browse
	m68k.elf	Get hash	malicious	Unknown	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	m68k.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	armv7l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	185.125.190.26
	x86.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	la.bot.arm7.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	x86.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	x86.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	.i.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm5.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
CANONICAL-ASGB	m68k.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	armv7l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	185.125.190.26
	x86.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	la.bot.arm7.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	x86.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
	x86.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	.i.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm5.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
INIT7CH	m68k.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	x86.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	la.bot.arm7.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	x86.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	la.bot.arc.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	x86.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	.i.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	arm5.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	m68k.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, Intel 80386, version 1 (GNU/Linux), statically linked, no section header
Entropy (8bit):	7.859551304192271
TrID:	ELF Executable and Linkable format (Linux) (4029/14) 50.16% ELF Executable and Linkable format (generic) (4004/1) 49.84%
File name:	x86.elf
File size:	26'036 bytes
MD5:	6c5f14de57bc36a6fa22bbf554e8049f
SHA1:	6422fa0c77161c15298af285be511e5b3cef6e3c
SHA256:	78b479fc15b2171a97a082f840f4c130158ee5033ba933247eb4d98ab8fc4122
SHA512:	9042e0f56d3c1dc17dc24f777c1d81251d94901f6bad1917ab1a5c588523d5b0d4338ae4b1dd3412506487379920d71bd493c45d48fe84aae9b881c37b0ca2a8
SSDEEP:	768:9uiLXz9ooR+MXEM0XCZVH+rdnYMy+MjFj5t:9uS5R+MXeXC7+5nq+MjFb
TLSH:	CBC2E107F98DAC63CB84C2330937945788A6FCB6D2666482032EDBD818F61CD23467A3
File Content Preview:	.ELF........................4...........4. ..................................................`...`..pd..pd..........Q.td................................lo..h.......L...........r........?d..ELF...........o...4..... ...(....._...-.#......}..~.....%........%

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	Intel 80386
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	UNIX - Linux
ABI Version:	0
Entry Point Address:	0x805bc10
Flags:	0x0
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
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	0x8048000	0x8048000	0x1000	0xddbc	7.6812	0x6	RW	0x1000
LOAD	0x0	0x8056000	0x8056000	0x6470	0x6470	7.8626	0x5	R E	0x1000
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x6	RW	0x4

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Oct 25, 2024 08:08:48.351919889 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 25, 2024 08:08:53.983186007 CEST	42836	443	192.168.2.23	91.189.91.43
Oct 25, 2024 08:08:54.751115084 CEST	42516	80	192.168.2.23	109.202.202.202
Oct 25, 2024 08:09:09.341125011 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 25, 2024 08:09:19.579678059 CEST	42836	443	192.168.2.23	91.189.91.43
Oct 25, 2024 08:09:25.722680092 CEST	42516	80	192.168.2.23	109.202.202.202
Oct 25, 2024 08:09:50.295378923 CEST	43928	443	192.168.2.23	91.189.91.42
Oct 25, 2024 08:10:10.772718906 CEST	42836	443	192.168.2.23	91.189.91.43

System Behavior

Analysis Process: x86.elf PID: 6209, Parent PID: 6129

General

Start time (UTC):	06:08:50
Start date (UTC):	25/10/2024
Path:	/tmp/x86.elf
Arguments:	/tmp/x86.elf
File size:	26036 bytes
MD5 hash:	6c5f14de57bc36a6fa22bbf554e8049f

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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Linux Analysis Report x86.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Runtime Messages

Process Tree

Yara Signatures

Memory Dumps

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

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: x86.elf PID: 6209, Parent PID: 6129

General

Chronological Activities

Linux Analysis Report
x86.elf