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Linux Analysis Report
krm6.elf

Overview

General Information

Sample name:	krm6.elf
Analysis ID:	1675588
MD5:	37ee19caca4410a5309d3afbb54eafcb
SHA1:	82508d28f6b9e9bac698dc9368e5fe86d7f4a2a8
SHA256:	8c0bdb1fb86beddcda4b0864bfdb1c6a14284f60daf60b740147861420e271ac
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100

Signatures

Multi AV Scanner detection for submitted file

Sample has stripped symbol table

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)

Classification

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1675588
Start date and time:	2025-04-27 20:33:23 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 35s
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:	krm6.elf
Detection:	MAL
Classification:	mal48.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/krm6.elf
PID:	6231
Exit Code:	255
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:	/tmp/krm6.elf: Invalid argument

Process Tree

system is lnxubuntu20

krm6.elf (PID: 6231, Parent: 6154, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/krm6.elf

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

• AV Detection
• Networking
• System Summary
• Malware Analysis System Evasion

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: krm6.elf	Virustotal: Detection: 14%			Perma Link
Source: krm6.elf	ReversingLabs: Detection: 22%

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	Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 42836 -> 443

Source: ELF static info symbol of initial sample

.symtab present: no

Source: classification engine

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

Source: /tmp/krm6.elf (PID: 6231)

Queries kernel information via 'uname':

Jump to behavior

Source: krm6.elf, 6231.1.000055e93fbed000.000055e93fcf9000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/arm
Source: krm6.elf, 6231.1.00007ffe917e1000.00007ffe91802000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/krm6.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/krm6.elf
Source: krm6.elf, 6231.1.00007ffe917e1000.00007ffe91802000.rw-.sdmp	Binary or memory string: qemu: %s: %s
Source: krm6.elf, 6231.1.00007ffe917e1000.00007ffe91802000.rw-.sdmp	Binary or memory string: leqemu: %s: %s
Source: krm6.elf, 6231.1.000055e93fbed000.000055e93fcf9000.rw-.sdmp	Binary or memory string: Urg.qemu.gdb.arm.sys.regs">
Source: krm6.elf, 6231.1.000055e93fbed000.000055e93fcf9000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: krm6.elf, 6231.1.00007ffe917e1000.00007ffe91802000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm
Source: krm6.elf, 6231.1.000055e93fbed000.000055e93fcf9000.rw-.sdmp	Binary or memory string: rg.qemu.gdb.arm.sys.regs">

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 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
krm6.elf	15%	Virustotal		Browse
krm6.elf	22%	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

⊘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	na.elf	Get hash	malicious	Prometei	Browse
	ppc.elf	Get hash	malicious	Unknown	Browse
	m68k.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse
	arm6.elf	Get hash	malicious	Mirai, Okiru	Browse
	spc.elf	Get hash	malicious	Unknown	Browse
	arm4.elf	Get hash	malicious	Unknown	Browse
	.i.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	mips.elf	Get hash	malicious	Unknown	Browse
	crossc2.elf	Get hash	malicious	Unknown	Browse
91.189.91.42	na.elf	Get hash	malicious	Prometei	Browse
	ppc.elf	Get hash	malicious	Unknown	Browse
	m68k.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse
	arm6.elf	Get hash	malicious	Unknown	Browse
	arm6.elf	Get hash	malicious	Mirai, Okiru	Browse
	spc.elf	Get hash	malicious	Unknown	Browse
	arm4.elf	Get hash	malicious	Unknown	Browse
	.i.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	mips.elf	Get hash	malicious	Unknown	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	mssl.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	ppc.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm7.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	x86.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	m68k.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse	91.189.91.42
	arm6.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm5.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse	185.125.190.26
	arm6.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	spc.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
CANONICAL-ASGB	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	ppc.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm7.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	x86.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	m68k.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse	91.189.91.42
	arm6.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm5.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse	185.125.190.26
	arm6.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	spc.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm4.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
INIT7CH	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	ppc.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	m68k.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse	109.202.202.202
	arm6.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	arm6.elf	Get hash	malicious	Mirai, Okiru	Browse	109.202.202.202
	spc.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	arm4.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	.i.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	mips.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, ARM, EABI4 version 1 (SYSV), statically linked, stripped
Entropy (8bit):	6.196562594357276
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	krm6.elf
File size:	81'160 bytes
MD5:	37ee19caca4410a5309d3afbb54eafcb
SHA1:	82508d28f6b9e9bac698dc9368e5fe86d7f4a2a8
SHA256:	8c0bdb1fb86beddcda4b0864bfdb1c6a14284f60daf60b740147861420e271ac
SHA512:	fcb8d8bbe8714b438ed5acb839434a839b7efcfc540d092b55b5812edfb21fab33638987cb8dfab5991b63d1ed194a832a43384e20d244498dd6e850735080ea
SSDEEP:	1536:i4n/5CwQHglSzMwqB11IZ1hZQUMMi49swME9aSshz/R5hYmx7:l5egAI1BQZz9swME9aS+zRLnd
TLSH:	AD83181BBC819B52D9D212B9FA2E614E331317B8E3DF72169C149F3477C39670A3A905
File Content Preview:	.ELF..............(.....T...4...(;......4. ...(.....................h7..h7..............h7...@...@..P...p:..........Q.td..................................-...L..................@-.,@...0....S..... 0....S.........../..0...0...@..../.PC.......@....-.@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:	80680
Section Header Size:	40
Number of Section Headers:	12
Header String Table Index:	11

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	0x11978	0x0	0x6	AX	16
.fini	PROGBITS	0x19a28	0x11a28	0x10	0x0	0x6	AX	4
.rodata	PROGBITS	0x19a38	0x11a38	0x1d30	0x0	0x2	A	8
.init_array	INIT_ARRAY	0x24004	0x1376c	0x4	0x0	0x3	WA	4
.fini_array	FINI_ARRAY	0x24008	0x13770	0x4	0x0	0x3	WA	4
.got	PROGBITS	0x24010	0x13778	0x74	0x4	0x3	WA	4
.data	PROGBITS	0x24084	0x137ec	0x2cc	0x0	0x3	WA	4
.bss	NOBITS	0x24350	0x13ab8	0x3720	0x0	0x3	WA	4
.ARM.attributes	ARM_ATTRIBUTES	0x0	0x13ab8	0x10	0x0	0x0		1
.shstrtab	STRTAB	0x0	0x13ac8	0x5d	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	0x13768	0x13768	6.2143	0x5	R E	0x10	.init .text .fini .rodata
LOAD	0x13768	0x24004	0x24000	0x350	0x3a70	4.2434	0x6	RW	0x4	.init_array .fini_array .got .data .bss
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x7	RWE	0x4

Network Behavior

Download Network PCAP: filtered – full

Network Port Distribution

Total Packets: 7
• 443 (HTTPS)
• 80 (HTTP)

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Apr 27, 2025 20:34:11.695200920 CEST	43928	443	192.168.2.23	91.189.91.42
Apr 27, 2025 20:34:17.326553106 CEST	42836	443	192.168.2.23	91.189.91.43
Apr 27, 2025 20:34:18.862333059 CEST	42516	80	192.168.2.23	109.202.202.202
Apr 27, 2025 20:34:32.428421974 CEST	43928	443	192.168.2.23	91.189.91.42
Apr 27, 2025 20:34:44.714685917 CEST	42836	443	192.168.2.23	91.189.91.43
Apr 27, 2025 20:34:48.810178041 CEST	42516	80	192.168.2.23	109.202.202.202
Apr 27, 2025 20:35:13.382883072 CEST	43928	443	192.168.2.23	91.189.91.42

System Behavior

Analysis Process: krm6.elf PID: 6231, Parent PID: 6154

General

Start time (UTC):	18:34:09
Start date (UTC):	27/04/2025
Path:	/tmp/krm6.elf
Arguments:	/tmp/krm6.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 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 krm6.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

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

Sections

Program Segments

Network Behavior

Network Port Distribution

TCP Packets

System Behavior

Analysis Process: krm6.elf PID: 6231, Parent PID: 6154

General

File Activities

File Opened

File Read

Process Activities

Thread Sleep

System Activities

Query System Information (uname)

Chronological Activities

Linux Analysis Report
krm6.elf