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Linux Analysis Report
i.elf

Overview

General Information

Sample name:	i.elf
Analysis ID:	1669976
MD5:	e8843252ba9ccd19d8a0cae124768d94
SHA1:	80464057bdce2d19afdf91747e82cac0c1a7f0b6
SHA256:	8a86037e2e6d7ef4e84f1dbcb8be3b4ea3eb2694b480b36fb362344a2159e67c
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100

Signatures

Multi AV Scanner detection for submitted file

ELF contains segments with high entropy indicating compressed/encrypted content

Sample contains only a LOAD segment without any section mappings

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

Classification

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1669976
Start date and time:	2025-04-20 20:59:19 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 22s
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:	i.elf
Detection:	MAL
Classification:	mal48.linELF@0/0@2/0

Runtime Messages

Command:	/tmp/i.elf
PID:	5432
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

i.elf (PID: 5432, Parent: 5356, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/i.elf

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

• AV Detection
• Networking
• System Summary
• Hooking and other Techniques for Hiding and Protection
• Malware Analysis System Evasion

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: i.elf

ReversingLabs: Detection: 47%

Source: global traffic

DNS traffic detected: DNS query: daisy.ubuntu.com

Source: LOAD without section mappings

Program segment: 0x10000

Source: classification engine

Classification label: mal48.linELF@0/0@2/0

Source: i.elf

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

Source: /tmp/i.elf (PID: 5432)

Queries kernel information via 'uname':

Jump to behavior

Source: i.elf, 5432.1.000055f88dd6c000.000055f88de9a000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/arm
Source: i.elf, 5432.1.00007ffee0fd3000.00007ffee0ff4000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/i.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/i.elf
Source: i.elf, 5432.1.000055f88dd6c000.000055f88de9a000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: i.elf, 5432.1.00007ffee0fd3000.00007ffee0ff4000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm
Source: i.elf, 5432.1.00007ffee0fd3000.00007ffee0ff4000.rw-.sdmp	Binary or memory string: qemu: uncaught target signal 11 (Segmentation fault) - core dumped

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 Non-Application Layer Protocol	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
i.elf	47%	ReversingLabs	Linux.Backdoor.Mirai

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Download Network PCAP: filtered – full

Contacted Domains

Name	IP	Active	Malicious	Antivirus Detection	Reputation
daisy.ubuntu.com	162.213.35.25	true	false		high

World Map of Contacted IPs

⊘No contacted IP infos

Joe Sandbox View / Context

IPs

⊘No context

Domains

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
daisy.ubuntu.com	arm6.elf	Get hash	malicious	Mirai	Browse	162.213.35.24
	.i.elf	Get hash	malicious	Unknown	Browse	162.213.35.25
	boatnet.sh4.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	boatnet.ppc.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	hotnet.arm6.elf	Get hash	malicious	Mirai, Okiru	Browse	162.213.35.25
	hotnet.arm7.elf	Get hash	malicious	Mirai, Okiru	Browse	162.213.35.24
	hotnet.arm5.elf	Get hash	malicious	Mirai, Okiru	Browse	162.213.35.24
	hotnet.mpsl.elf	Get hash	malicious	Mirai, Okiru	Browse	162.213.35.24
	hotnet.arm.elf	Get hash	malicious	Mirai, Okiru	Browse	162.213.35.24
	boatnet.arm5.elf	Get hash	malicious	Unknown	Browse	162.213.35.24

ASNs

⊘No context

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, ARM, EABI5 version 1 (GNU/Linux), statically linked, no section header
Entropy (8bit):	7.9961769572704124
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	i.elf
File size:	54'936 bytes
MD5:	e8843252ba9ccd19d8a0cae124768d94
SHA1:	80464057bdce2d19afdf91747e82cac0c1a7f0b6
SHA256:	8a86037e2e6d7ef4e84f1dbcb8be3b4ea3eb2694b480b36fb362344a2159e67c
SHA512:	3545682fce4f31213ebfb7f5eec49f5048ae9f43e02304f83d078e3a494c14570dacd1a7ed7710ee3aaf41215caea357891813b30d046d8e727dca458202e5ec
SSDEEP:	1536:87vbq1lGAXSEYQjbChaAU2yU23M51DjZgSQAT:8D+CAXFYQChaAUk5ljnQG
TLSH:	F43302E01761278C4375E9753CEE304E8524192F72EA2D102DABD18EF45B61268B7EFD
File Content Preview:	.ELF..............(......'..4...........4. ...(......................7...7.............................................c........................i..........?.E.h;....#..$..O.%.......y.A.U"......-R..e....<l>=).!...O........u.....`o..*ziy"......R..~@....x2'_

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:	UNIX - Linux
ABI Version:	0
Entry Point Address:	0x22718
Flags:	0x5000202
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	0x10000	0x10000	0x137e9	0x137e9	7.9962	0x5	R E	0x10000
LOAD	0x6fc	0x506fc	0x506fc	0x0	0x0	0.0000	0x6	RW	0x10000

Network Behavior

Download Network PCAP: filtered – full

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Apr 20, 2025 21:00:08.801853895 CEST	34708	53	192.168.2.13	8.8.8.8
Apr 20, 2025 21:00:08.801898003 CEST	35855	53	192.168.2.13	8.8.8.8
Apr 20, 2025 21:00:08.949637890 CEST	53	35855	8.8.8.8	192.168.2.13
Apr 20, 2025 21:00:08.960160971 CEST	53	34708	8.8.8.8	192.168.2.13

DNS Queries

Timestamp	Source IP	Dest IP	Trans ID	OP Code	Name	Type	Class	DNS over HTTPS
Apr 20, 2025 21:00:08.801853895 CEST	192.168.2.13	8.8.8.8	0xfb65	Standard query (0)	daisy.ubuntu.com	A (IP address)	IN (0x0001)	false
Apr 20, 2025 21:00:08.801898003 CEST	192.168.2.13	8.8.8.8	0xe950	Standard query (0)	daisy.ubuntu.com	28	IN (0x0001)	false

DNS Answers

Timestamp	Source IP	Dest IP	Trans ID	Reply Code	Name	CName	Address	Type	Class	DNS over HTTPS
Apr 20, 2025 21:00:08.960160971 CEST	8.8.8.8	192.168.2.13	0xfb65	No error (0)	daisy.ubuntu.com		162.213.35.25	A (IP address)	IN (0x0001)	false
Apr 20, 2025 21:00:08.960160971 CEST	8.8.8.8	192.168.2.13	0xfb65	No error (0)	daisy.ubuntu.com		162.213.35.24	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: i.elf PID: 5432, Parent PID: 5356

General

Start time (UTC):	19:00:07
Start date (UTC):	20/04/2025
Path:	/tmp/i.elf
Arguments:	/tmp/i.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 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 use an OSI non-application layer protocol for communication between host and C2 server or among infected hosts within a network. The list of possible protocols is extensive.Specific examples include use of network layer protocols, such as the Internet Control Message Protocol (ICMP), transport layer protocols, such as the User Datagram Protocol (UDP), session layer protocols, such as Socket Secure (SOCKS), as well as redirected/tunneled protocols, such as Serial over LAN (SOL).
Tactics:	Command and Control
Data Sources:	Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow
Platforms:	Linux, macOS, Network, 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 i.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

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

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

UDP Packets

DNS Queries

DNS Answers

System Behavior

Analysis Process: i.elf PID: 5432, Parent PID: 5356

General

File Activities

File Opened

File Read

Process Activities

Signal Sent

Thread Sleep

System Activities

Query System Information (uname)

Chronological Activities

Linux Analysis Report
i.elf