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Linux Analysis Report
nklarm6.elf

Overview

General Information

Sample name:	nklarm6.elf
Analysis ID:	1630571
MD5:	6eaad3ff21101b0e6ae24cd170fee815
SHA1:	bb6f49c44b8c9a1d7dbe3c85f473225b53fbd823
SHA256:	9aba55493e3fbf4fe4686684933709fda97b98be01dc38f4b17b3dbb29bf72e2
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100

Signatures

Multi AV Scanner detection for submitted file

Sample has stripped symbol table

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

Classification

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1630571
Start date and time:	2025-03-06 02:17:25 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 28s
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:	nklarm6.elf
Detection:	MAL
Classification:	mal48.linELF@0/0@2/0

Runtime Messages

Command:	/tmp/nklarm6.elf
PID:	5414
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

nklarm6.elf (PID: 5414, Parent: 5339, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/nklarm6.elf

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: nklarm6.elf	Virustotal: Detection: 41%			Perma Link
Source: nklarm6.elf	ReversingLabs: Detection: 42%

Source: global traffic

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

Source: ELF static info symbol of initial sample

.symtab present: no

Source: classification engine

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

Source: /tmp/nklarm6.elf (PID: 5414)

Queries kernel information via 'uname':

Jump to behavior

Source: nklarm6.elf, 5414.1.00007ffe5abe8000.00007ffe5ac09000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/nklarm6.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/nklarm6.elf
Source: nklarm6.elf, 5414.1.0000563c3ca19000.0000563c3cb47000.rw-.sdmp	Binary or memory string: <<V!/etc/qemu-binfmt/arm
Source: nklarm6.elf, 5414.1.0000563c3ca19000.0000563c3cb47000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: nklarm6.elf, 5414.1.00007ffe5abe8000.00007ffe5ac09000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm
Source: nklarm6.elf, 5414.1.00007ffe5abe8000.00007ffe5ac09000.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	Direct Volume Access	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

Screenshots

Thumbnails

This section contains all screenshots as thumbnails, including those not shown in the slideshow.

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
nklarm6.elf	41%	Virustotal		Browse
nklarm6.elf	42%	ReversingLabs	Linux.Backdoor.Mirai

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Contacted Domains

Name	IP	Active	Malicious	Antivirus Detection	Reputation
daisy.ubuntu.com	162.213.35.24	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	efea6.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	donk.arm5.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.mpsl.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.arm7.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.arm.elf	Get hash	malicious	Unknown	Browse	162.213.35.25
	eehah4.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.arm6.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.arm6.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.arm.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	5r3fqt67ew531has4231.arm5.elf	Get hash	malicious	Unknown	Browse	162.213.35.25

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, EABI4 version 1 (SYSV), statically linked, stripped
Entropy (8bit):	5.971453039102151
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	nklarm6.elf
File size:	62'712 bytes
MD5:	6eaad3ff21101b0e6ae24cd170fee815
SHA1:	bb6f49c44b8c9a1d7dbe3c85f473225b53fbd823
SHA256:	9aba55493e3fbf4fe4686684933709fda97b98be01dc38f4b17b3dbb29bf72e2
SHA512:	b840736cbffdf6112afbeb681687d7b16dfb4ac87ac1f24daad5240d9c7bb126179157785985260e3a9a80fc55d224faf04e8da544415e3dc73f23dead363707
SSDEEP:	1536:2Rn2oLFTaIHcx7OvzflHKQ4by16THPpPeIKi9EsTea:+Lhad7OvDlYby167FEsTea
TLSH:	2D530856B8C18E16C5D412BAFA2E118D332767B8D3DFB212DD105F247B8A82F0E7B915
File Content Preview:	.ELF..............(.....T...4...........4. ...(.....................................................x...............Q.td..................................-...L..................@-.,@...0....S..... 0....S.........../..0...0...@..../.x.............-.@0....S

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 - System V
ABI Version:	0
Entry Point Address:	0x8154
Flags:	0x4000002
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
Section Header Offset:	62192
Section Header Size:	40
Number of Section Headers:	13
Header String Table Index:	12

Sections

Name	Type	Address	Offset	Size	EntSize	Flags	Flags Description	Align
	NULL	0x0	0x0	0x0	0x0	0x0		0
.init	PROGBITS	0x8094	0x94	0x10	0x0	0x6	AX	4
.text	PROGBITS	0x80b0	0xb0	0xe3ec	0x0	0x6	AX	16
.fini	PROGBITS	0x1649c	0xe49c	0x10	0x0	0x6	AX	4
.rodata	PROGBITS	0x164ac	0xe4ac	0x870	0x0	0x2	A	4
.init_array	INIT_ARRAY	0x1f004	0xf008	0x4	0x0	0x3	WA	4
.fini_array	FINI_ARRAY	0x1f008	0xf00c	0x4	0x0	0x3	WA	4
.jcr	PROGBITS	0x1f00c	0xf010	0x4	0x0	0x3	WA	4
.got	PROGBITS	0x1f010	0xf014	0x74	0x4	0x3	WA	4
.data	PROGBITS	0x1f084	0xf088	0x1f4	0x0	0x3	WA	4
.bss	NOBITS	0x1f278	0xf27c	0x255c	0x0	0x3	WA	4
.ARM.attributes	ARM_ATTRIBUTES	0x0	0xf27c	0x10	0x0	0x0		1
.shstrtab	STRTAB	0x0	0xf28c	0x62	0x0	0x0		1

Program Segments

Type	Offset	Virtual Address	Physical Address	File Size	Memory Size	Entropy	Flags	Flags Description	Align	Section Mappings
LOAD	0x0	0x8000	0x8000	0xed1c	0xed1c	6.0382	0x5	R E	0x8000	.init .text .fini .rodata
LOAD	0xf004	0x1f004	0x1f000	0x278	0xa7d0	3.2045	0x6	RW	0x8000	.init_array .fini_array .jcr .got .data .bss
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x7	RWE	0x4

Network Behavior

Network Port Distribution

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Mar 6, 2025 02:18:15.865698099 CET	50215	53	192.168.2.13	8.8.8.8
Mar 6, 2025 02:18:15.865748882 CET	38057	53	192.168.2.13	8.8.8.8
Mar 6, 2025 02:18:15.872164011 CET	53	50215	8.8.8.8	192.168.2.13
Mar 6, 2025 02:18:15.872395992 CET	53	38057	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
Mar 6, 2025 02:18:15.865698099 CET	192.168.2.13	8.8.8.8	0x482	Standard query (0)	daisy.ubuntu.com	A (IP address)	IN (0x0001)	false
Mar 6, 2025 02:18:15.865748882 CET	192.168.2.13	8.8.8.8	0x4e2	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
Mar 6, 2025 02:18:15.872164011 CET	8.8.8.8	192.168.2.13	0x482	No error (0)	daisy.ubuntu.com		162.213.35.24	A (IP address)	IN (0x0001)	false
Mar 6, 2025 02:18:15.872164011 CET	8.8.8.8	192.168.2.13	0x482	No error (0)	daisy.ubuntu.com		162.213.35.25	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: nklarm6.elf PID: 5414, Parent PID: 5339

General

Start time (UTC):	01:18:13
Start date (UTC):	06/03/2025
Path:	/tmp/nklarm6.elf
Arguments:	/tmp/nklarm6.elf
File size:	4956856 bytes
MD5 hash:	5ebfcae4fe2471fcc5695c2394773ff1

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 nklarm6.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

Malware Analysis System Evasion

Mitre Att&ck Matrix

Malware Configuration

Behavior Graph

Screenshots

Thumbnails

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

Sections

Program Segments

Network Behavior

Network Port Distribution

UDP Packets

DNS Queries

DNS Answers

System Behavior

Analysis Process: nklarm6.elf PID: 5414, Parent PID: 5339

General

Chronological Activities

Linux Analysis Report
nklarm6.elf