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Linux Analysis Report
dlr.arm.elf

Overview

General Information

Sample name:	dlr.arm.elf
Analysis ID:	1582182
MD5:	b140cfc3db0ba060915d4510ccc5ef61
SHA1:	1f0f2e4bdfeb1450b592b1faae6e03f78a3cabc6
SHA256:	3957dca9bdf769f022050d315ad83a582b3c73b25beb3ad93aceadbae308c872
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100
Whitelisted:	false

Signatures

Multi AV Scanner detection for submitted file

Executes the "rm" command used to delete files or directories

Sample has stripped symbol table

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

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1582182
Start date and time:	2024-12-30 03:34:40 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 55s
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:	dlr.arm.elf
Detection:	MAL
Classification:	mal48.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/dlr.arm.elf
PID:	6268
Exit Code:	139
Exit Code Info:	SIGSEGV (11) Segmentation fault invalid memory reference
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

dlr.arm.elf (PID: 6268, Parent: 6188, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/dlr.arm.elf

dash New Fork (PID: 6298, Parent: 4335)

rm (PID: 6298, Parent: 4335, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.eWfnxFunfq /tmp/tmp.4ZfMlewvPp /tmp/tmp.mBG3gkdpbK

dash New Fork (PID: 6299, Parent: 4335)

rm (PID: 6299, Parent: 4335, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.eWfnxFunfq /tmp/tmp.4ZfMlewvPp /tmp/tmp.mBG3gkdpbK

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: dlr.arm.elf	ReversingLabs: Detection: 44%
Source: dlr.arm.elf	Virustotal: Detection: 30%			Perma Link

Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown	TCP traffic detected without corresponding DNS query: 34.249.145.219
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: 91.189.91.42

Source: unknown	Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 443 -> 39256
Source: unknown	Network traffic detected: HTTP traffic on port 39256 -> 443

Source: ELF static info symbol of initial sample

.symtab present: no

Source: classification engine

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

Source: /usr/bin/dash (PID: 6298)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.eWfnxFunfq /tmp/tmp.4ZfMlewvPp /tmp/tmp.mBG3gkdpbK			Jump to behavior
Source: /usr/bin/dash (PID: 6299)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.eWfnxFunfq /tmp/tmp.4ZfMlewvPp /tmp/tmp.mBG3gkdpbK			Jump to behavior

Source: /tmp/dlr.arm.elf (PID: 6268)

Queries kernel information via 'uname':

Jump to behavior

Source: dlr.arm.elf, 6268.1.0000561e32fb3000.0000561e330bf000.rw-.sdmp	Binary or memory string: Vrg.qemu.gdb.arm.sys.regs">
Source: dlr.arm.elf, 6268.1.00007ffef06a9000.00007ffef06ca000.rw-.sdmp	Binary or memory string: ;x86_64/usr/bin/qemu-arm/tmp/dlr.arm.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/dlr.arm.elf
Source: dlr.arm.elf, 6268.1.0000561e32fb3000.0000561e330bf000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: dlr.arm.elf, 6268.1.0000561e32fb3000.0000561e330bf000.rw-.sdmp	Binary or memory string: V!/etc/qemu-binfmt/arm
Source: dlr.arm.elf, 6268.1.00007ffef06a9000.00007ffef06ca000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm
Source: dlr.arm.elf, 6268.1.0000561e32fb3000.0000561e330bf000.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	1 File Deletion	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

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
dlr.arm.elf	45%	ReversingLabs	Linux.Backdoor.Mirai
dlr.arm.elf	30%	Virustotal		Browse

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
34.249.145.219	unknown	United States	16509	AMAZON-02US	false
109.202.202.202	unknown	Switzerland	13030	INIT7CH	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
34.249.145.219	arm.elf	Get hash	malicious	Mirai, Moobot	Browse
	rebirth.ppc.elf	Get hash	malicious	Gafgyt	Browse
	dlr.arm7.elf	Get hash	malicious	Mirai	Browse
	udpmpsl.elf	Get hash	malicious	Unknown	Browse
	bot.x86_64.elf	Get hash	malicious	Mirai, Gafgyt, Okiru	Browse
	main_mpsl.elf	Get hash	malicious	Mirai	Browse
	ub8ehJSePAfc9FYqZIT6.arm7.elf	Get hash	malicious	Mirai	Browse
	telnet.arm7.elf	Get hash	malicious	Unknown	Browse
	main_arm7.elf	Get hash	malicious	Mirai	Browse
	boatnet.spc.elf	Get hash	malicious	Mirai	Browse
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
91.189.91.42	rebirth.sh4.elf	Get hash	malicious	Gafgyt	Browse
	.Sarm5.elf	Get hash	malicious	Unknown	Browse
	arm5.elf	Get hash	malicious	Unknown	Browse
	zmap.arm6.elf	Get hash	malicious	Mirai, Okiru	Browse
	.Smpsl.elf	Get hash	malicious	Unknown	Browse
	arm.elf	Get hash	malicious	Mirai, Moobot	Browse
	rebirth.ppc.elf	Get hash	malicious	Gafgyt	Browse
	dlr.arm7.elf	Get hash	malicious	Mirai	Browse
	.Sm68k.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	rebirth.sh4.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	dlr.mpsl.elf	Get hash	malicious	Unknown	Browse	185.125.190.26
	.Sarm5.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm5.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	zmap.arm6.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	debug.dbg.elf	Get hash	malicious	Mirai, Moobot	Browse	185.125.190.26
	.Smpsl.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	arm.elf	Get hash	malicious	Mirai, Moobot	Browse	91.189.91.42
	rebirth.ppc.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	dlr.arm7.elf	Get hash	malicious	Mirai	Browse	91.189.91.42
INIT7CH	rebirth.sh4.elf	Get hash	malicious	Gafgyt	Browse	109.202.202.202
	.Sarm5.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	arm5.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	zmap.arm6.elf	Get hash	malicious	Mirai, Okiru	Browse	109.202.202.202
	.Smpsl.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	arm.elf	Get hash	malicious	Mirai, Moobot	Browse	109.202.202.202
	rebirth.ppc.elf	Get hash	malicious	Gafgyt	Browse	109.202.202.202
	dlr.arm7.elf	Get hash	malicious	Mirai	Browse	109.202.202.202
	.Sm68k.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	m68k.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
AMAZON-02US	arm.elf	Get hash	malicious	Mirai, Moobot	Browse	34.249.145.219
	rebirth.ppc.elf	Get hash	malicious	Gafgyt	Browse	34.249.145.219
	dlr.arm7.elf	Get hash	malicious	Mirai	Browse	34.249.145.219
	udpmpsl.elf	Get hash	malicious	Unknown	Browse	34.249.145.219
	.Sx86.elf	Get hash	malicious	Unknown	Browse	54.171.230.55
	loligang.spc.elf	Get hash	malicious	Mirai	Browse	108.146.236.114
	loligang.mips.elf	Get hash	malicious	Mirai	Browse	18.167.172.156
	loligang.mpsl.elf	Get hash	malicious	Mirai	Browse	13.221.153.208
	loligang.arm.elf	Get hash	malicious	Mirai	Browse	13.245.236.62
	loligang.arm7.elf	Get hash	malicious	Mirai	Browse	44.229.110.130

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, stripped
Entropy (8bit):	4.953611321316374
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	dlr.arm.elf
File size:	1'152 bytes
MD5:	b140cfc3db0ba060915d4510ccc5ef61
SHA1:	1f0f2e4bdfeb1450b592b1faae6e03f78a3cabc6
SHA256:	3957dca9bdf769f022050d315ad83a582b3c73b25beb3ad93aceadbae308c872
SHA512:	b2c9f22b8e53e2c265e04ebf9e268aa4288ac7889bc68419dee7f472dc1455ddbe77a731a9b60aad533aec007923a289d4992e16e1b4243f4890e055543d8add
SSDEEP:	24:J6KFpV0gP9qD0at6EoKGRrUlFSy40VzLCkIddgH9IkABNfm:J6KjFqDPtsrkFSy4CzLT9IkABNe
TLSH:	B4219BE667D39E2BCC980337DCEF5714E322AA848A9EB513E35216250D3F21A5F21159
File Content Preview:	.ELF...a..........(.........4...........4. ...(..................................................................................0...$.......,... ...<.......4.. ..."....<.......................................................0... ............-...M........

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:	0x831c
Flags:	0x202
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	2
Section Header Offset:	952
Section Header Size:	40
Number of Section Headers:	5
Header String Table Index:	4

Sections

Name	Type	Address	Offset	Size	EntSize	Flags	Flags Description	Align
	NULL	0x0	0x0	0x0	0x0	0x0		0
.text	PROGBITS	0x8074	0x74	0x2e8	0x0	0x6	AX	4
.rodata	PROGBITS	0x835c	0x35c	0x3c	0x1	0x32	AMS	4
.bss	NOBITS	0x10398	0x398	0x8	0x0	0x3	WA	4
.shstrtab	STRTAB	0x0	0x398	0x1e	0x0	0x0		1

Program Segments

Type	Offset	Virtual Address	Physical Address	File Size	Memory Size	Entropy	Flags	Flags Description	Align	Prog Interpreter	Section Mappings
LOAD	0x0	0x8000	0x8000	0x398	0x398	5.3500	0x5	R E	0x8000		.text .rodata
LOAD	0x398	0x10398	0x10398	0x0	0x8	0.0000	0x6	RW	0x8000		.bss

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Dec 30, 2024 03:35:55.658770084 CET	43928	443	192.168.2.23	91.189.91.42
Dec 30, 2024 03:36:07.825304031 CET	443	39256	34.249.145.219	192.168.2.23
Dec 30, 2024 03:36:07.825531006 CET	39256	443	192.168.2.23	34.249.145.219
Dec 30, 2024 03:36:07.830372095 CET	443	39256	34.249.145.219	192.168.2.23
Dec 30, 2024 03:36:12.040527105 CET	42516	80	192.168.2.23	109.202.202.202
Dec 30, 2024 03:36:16.135965109 CET	43928	443	192.168.2.23	91.189.91.42
Dec 30, 2024 03:36:57.090454102 CET	43928	443	192.168.2.23	91.189.91.42

System Behavior

Analysis Process: dlr.arm.elf PID: 6268, Parent PID: 6188

General

Start time (UTC):	02:35:53
Start date (UTC):	30/12/2024
Path:	/tmp/dlr.arm.elf
Arguments:	/tmp/dlr.arm.elf
File size:	4956856 bytes
MD5 hash:	5ebfcae4fe2471fcc5695c2394773ff1

Chronological Activities

Analysis Process: dash PID: 6298, Parent PID: 4335

General

Start time (UTC):	02:36:06
Start date (UTC):	30/12/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6298, Parent PID: 4335

General

Start time (UTC):	02:36:06
Start date (UTC):	30/12/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.eWfnxFunfq /tmp/tmp.4ZfMlewvPp /tmp/tmp.mBG3gkdpbK
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: dash PID: 6299, Parent PID: 4335

General

Start time (UTC):	02:36:06
Start date (UTC):	30/12/2024
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6299, Parent PID: 4335

General

Start time (UTC):	02:36:06
Start date (UTC):	30/12/2024
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.eWfnxFunfq /tmp/tmp.4ZfMlewvPp /tmp/tmp.mBG3gkdpbK
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Description:	Adversaries may delete files left behind by the actions of their intrusion activity. Malware, tools, or other non-native files dropped or created on a system by an adversary (ex: Ingress Tool Transfer ) may leave traces to indicate to what was done within a network and how. Removal of these files can occur during an intrusion, or as part of a post-intrusion process to minimize the adversary's footprint.
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Deletion
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 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 dlr.arm.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

Persistence and Installation Behavior

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

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: dlr.arm.elf PID: 6268, Parent PID: 6188

General

Chronological Activities

Analysis Process: dash PID: 6298, Parent PID: 4335

General

Chronological Activities

Analysis Process: rm PID: 6298, Parent PID: 4335

General

Chronological Activities

Analysis Process: dash PID: 6299, Parent PID: 4335

General

Chronological Activities

Analysis Process: rm PID: 6299, Parent PID: 4335

General

Chronological Activities

Linux Analysis Report
dlr.arm.elf