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Linux Analysis Report
na.elf

Overview

General Information

Sample name:	na.elf
Analysis ID:	1530534
MD5:	a721d26b612fb64d46236ef9816b2d2d
SHA1:	7ab8451e192272617c570147428bb086c9f3a503
SHA256:	18f3f77e7c8bad69ed4c2bde4bbd0dd16b54804088cb608a3f3ca68661662b57
Tags:	elfuser-abuse_ch
Infos:

Detection

Mirai

Score:	76
Range:	0 - 100
Whitelisted:	false

Signatures

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Yara detected Mirai

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

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:	1530534
Start date and time:	2024-10-10 09:35:13 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 18s
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:	mal76.troj.evad.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/na.elf
PID:	5436
Exit Code:	127
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

na.elf (PID: 5436, Parent: 5359, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/na.elf

cleanup

Yara Signatures

Memory Dumps

Source	Rule	Description	Author	Strings
5436.1.00007f65fc017000.00007f65fc026000.r-x.sdmp	JoeSecurity_Mirai_9	Yara detected Mirai	Joe Security
5436.1.00007f65fc017000.00007f65fc026000.r-x.sdmp	JoeSecurity_Mirai_5	Yara detected Mirai	Joe Security
5436.1.00007f65fc017000.00007f65fc026000.r-x.sdmp	MAL_ELF_LNX_Mirai_Oct10_2	Detects ELF malware Mirai related	Florian Roth	0xd9a0:$c01: 50 4F 53 54 20 2F 63 64 6E 2D 63 67 69 2F 00 00 20 48 54 54 50 2F 31 2E 31 0D 0A 55 73 65 72 2D 41 67 65 6E 74 3A 20 00 0D 0A 48 6F 73 74 3A

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	Virustotal: Detection: 47%			Perma Link
Source: na.elf	ReversingLabs: Detection: 60%

Source: na.elf

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

System Summary

Malicious sample detected (through community Yara rule)

Source: 5436.1.00007f65fc017000.00007f65fc026000.r-x.sdmp, type: MEMORY

Matched rule: Detects ELF malware Mirai related Author: Florian Roth

Source: LOAD without section mappings

Program segment: 0x8000

Source: 5436.1.00007f65fc017000.00007f65fc026000.r-x.sdmp, type: MEMORY

Matched rule: MAL_ELF_LNX_Mirai_Oct10_2 date = 2018-10-27, hash1 = fa0018e75f503f9748a5de0d14d4358db234f65e28c31c8d5878cc58807081c9, author = Florian Roth, description = Detects ELF malware Mirai related, reference = Internal Research

Source: classification engine

Classification label: mal76.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. $

Source: na.elf

Submission file: segment LOAD with 7.9312 entropy (max. 8.0)

Source: /tmp/na.elf (PID: 5436)

Queries kernel information via 'uname':

Jump to behavior

Source: na.elf, 5436.1.00007ffc5f719000.00007ffc5f73a000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/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, 5436.1.00005587b69d4000.00005587b6c02000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/arm
Source: na.elf, 5436.1.00005587b69d4000.00005587b6c02000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: na.elf, 5436.1.00007ffc5f719000.00007ffc5f73a000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm

Stealing of Sensitive Information

Yara detected Mirai

Source: Yara match

File source: 5436.1.00007f65fc017000.00007f65fc026000.r-x.sdmp, type: MEMORY

Remote Access Functionality

Yara detected Mirai

Source: Yara match

File source: 5436.1.00007f65fc017000.00007f65fc026000.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	Data Obfuscation	Exfiltration Over Other Network Medium	Abuse Accessibility Features

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	48%	Virustotal		Browse
na.elf	61%	ReversingLabs	Linux.Trojan.Mirai

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

Source	Detection	Scanner	Label	Link
http://upx.sf.net	0%	URL Reputation	safe

Domains and IPs

Contacted Domains

⊘No contacted domains info

URLs from Memory and Binaries

Name	Source	Malicious	Antivirus Detection	Reputation
http://upx.sf.net	na.elf	true	URL Reputation: safe	unknown

World Map of Contacted IPs

⊘No contacted IP infos

Joe Sandbox View / Context

IPs

⊘No context

Domains

⊘No context

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, version 1 (ARM), statically linked, no section header
Entropy (8bit):	7.927868039447187
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	na.elf
File size:	24'536 bytes
MD5:	a721d26b612fb64d46236ef9816b2d2d
SHA1:	7ab8451e192272617c570147428bb086c9f3a503
SHA256:	18f3f77e7c8bad69ed4c2bde4bbd0dd16b54804088cb608a3f3ca68661662b57
SHA512:	aca7cbd7e88952fd9f28ab2dc3b6721b0b704f704524157dc73e6b78c1ef40734005f9c30aa190e64a29e7ac3dd50d6d9c4a9fc41a37efcc18bb76ad3804790d
SSDEEP:	384:4GaKXlJIDFUS0Mggks3aIrokYVDoDDRRKj55N7LB9U+BspNT8YhymdGUop5hu7a:4GaKQFH0rs3zWoDDRsjt7LB9U+BKp8Yk
TLSH:	7CB2D1B487A16B06C2B0B475D27C8F935A3716E0C6F639161B2093BCD69549A33FCAC7
File Content Preview:	.ELF...a..........(.........4...........4. ...(....................._^.._^...............i..........................Q.td..............................CvUPX!....................q..........?.E.h;.}...^.........O#..&...^.W...4.s...irL.Y.n.i.+..r....4......@.

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:	0xccb0
Flags:	0x2
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	0x5e5f	0x5e5f	7.9312	0x5	R E	0x8000
LOAD	0x69e8	0x1e9e8	0x1e9e8	0x0	0x0	0.0000	0x6	RW	0x8000
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x7	RWE	0x4

Network Behavior

⊘No network behavior found

System Behavior

Analysis Process: na.elf PID: 5436, Parent PID: 5359

General

Start time (UTC):	07:35:55
Start date (UTC):	10/10/2024
Path:	/tmp/na.elf
Arguments:	/tmp/na.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

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

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Linux Analysis Report na.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

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

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

System Behavior

Analysis Process: na.elf PID: 5436, Parent PID: 5359

General

Chronological Activities

Linux Analysis Report
na.elf