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Linux Analysis Report
dlr.arm5.elf

Overview

General Information

Sample name:	dlr.arm5.elf
Analysis ID:	1592431
MD5:	46f8859d0b7d514243f6f742922cb836
SHA1:	454ecac269e2cb15d71692778e21c745cf459990
SHA256:	ef4a3eb4fc065b58fd96b6e37f6902a01fc5a415a0e44ca4d59ccc4123b15289
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

Reads the 'hosts' file potentially containing internal network hosts

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:	1592431
Start date and time:	2025-01-16 06:02:06 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 36s
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.arm5.elf
Detection:	MAL
Classification:	mal48.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/dlr.arm5.elf
PID:	6254
Exit Code:	1
Exit Code Info:
Killed:	False
Standard Output:	byte Failed to resolve domain
Standard Error:

Process Tree

system is lnxubuntu20

dash New Fork (PID: 6223, Parent: 4341)

rm (PID: 6223, Parent: 4341, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.1aImyQcZQQ /tmp/tmp.eoLQpca8xb /tmp/tmp.fbWCndrAKI

dash New Fork (PID: 6224, Parent: 4341)

rm (PID: 6224, Parent: 4341, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.1aImyQcZQQ /tmp/tmp.eoLQpca8xb /tmp/tmp.fbWCndrAKI

dlr.arm5.elf (PID: 6254, Parent: 6156, MD5: 5ebfcae4fe2471fcc5695c2394773ff1) Arguments: /tmp/dlr.arm5.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: dlr.arm5.elf

ReversingLabs: Detection: 18%

Source: /tmp/dlr.arm5.elf (PID: 6254)

Reads hosts file: /etc/hosts

Jump to behavior

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: /usr/bin/dash (PID: 6223)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.1aImyQcZQQ /tmp/tmp.eoLQpca8xb /tmp/tmp.fbWCndrAKI			Jump to behavior
Source: /usr/bin/dash (PID: 6224)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.1aImyQcZQQ /tmp/tmp.eoLQpca8xb /tmp/tmp.fbWCndrAKI			Jump to behavior

Source: /tmp/dlr.arm5.elf (PID: 6254)

Queries kernel information via 'uname':

Jump to behavior

Source: dlr.arm5.elf, 6254.1.00007ffca3965000.00007ffca3986000.rw-.sdmp	Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/dlr.arm5.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.arm5.elf
Source: dlr.arm5.elf, 6254.1.0000558ca0469000.0000558ca0597000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/arm
Source: dlr.arm5.elf, 6254.1.0000558ca0469000.0000558ca0597000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/arm
Source: dlr.arm5.elf, 6254.1.00007ffca3965000.00007ffca3986000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-arm

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	1 File and Directory 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
dlr.arm5.elf	18%	ReversingLabs	Linux.Downloader.Mirai

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
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	dlr.x86.elf	Get hash	malicious	Mirai, Okiru	Browse
	byte.m68k.elf	Get hash	malicious	Mirai, Okiru	Browse
	dlr.sh4.elf	Get hash	malicious	Unknown	Browse
	byte.mips.elf	Get hash	malicious	Mirai, Okiru	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	sshd.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
91.189.91.42	dlr.x86.elf	Get hash	malicious	Mirai, Okiru	Browse
	byte.m68k.elf	Get hash	malicious	Mirai, Okiru	Browse
	dlr.sh4.elf	Get hash	malicious	Unknown	Browse
	byte.mips.elf	Get hash	malicious	Mirai, Okiru	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	sshd.elf	Get hash	malicious	Unknown	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	dlr.x86.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	byte.m68k.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	dlr.sh4.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	byte.mips.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	sshd.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
CANONICAL-ASGB	dlr.x86.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	byte.m68k.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	dlr.sh4.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	byte.mips.elf	Get hash	malicious	Mirai, Okiru	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	sshd.elf	Get hash	malicious	Unknown	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
INIT7CH	dlr.x86.elf	Get hash	malicious	Mirai, Okiru	Browse	109.202.202.202
	byte.m68k.elf	Get hash	malicious	Mirai, Okiru	Browse	109.202.202.202
	dlr.sh4.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	byte.mips.elf	Get hash	malicious	Mirai, Okiru	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	sshd.elf	Get hash	malicious	Unknown	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	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, version 1 (ARM), statically linked, stripped
Entropy (8bit):	5.962791018728664
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	dlr.arm5.elf
File size:	34'632 bytes
MD5:	46f8859d0b7d514243f6f742922cb836
SHA1:	454ecac269e2cb15d71692778e21c745cf459990
SHA256:	ef4a3eb4fc065b58fd96b6e37f6902a01fc5a415a0e44ca4d59ccc4123b15289
SHA512:	b885adb8acb8181734f5b148a061c7c7cf66a61fd9e5221116bbff8d68486421b60403c83a0c21ac4f8d6b5a9a1319c6d60a636d16019cea5ad76ee603e9084c
SSDEEP:	768:9MEf6tb3HGQjXKOupnEKmI0M/ew8mD9m+1w9fYI:9Dytb3pXKOu3//M2Y+Om
TLSH:	54F22A95FD419B02C5C26577FF5F4348BB2A4358E2FB3307AA2A6F20378B9560E3A505
File Content Preview:	.ELF...a..........(.....l...4...X.......4. ...(.........................................................0%..........Q.td.....................................................................................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:	0x836c
Flags:	0x2
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
Section Header Offset:	34392
Section Header Size:	40
Number of Section Headers:	6
Header String Table Index:	5

Sections

Name	Type	Address	Offset	Size	EntSize	Flags	Flags Description	Align
	NULL	0x0	0x0	0x0	0x0	0x0		0
.text	PROGBITS	0x80a0	0xa0	0x6f3c	0x0	0x6	AX	16
.rodata	PROGBITS	0xefdc	0x6fdc	0x13b4	0x0	0x2	A	4
.data	PROGBITS	0x18390	0x8390	0x2a4	0x0	0x3	WA	4
.bss	NOBITS	0x18634	0x8634	0x228c	0x0	0x3	WA	4
.shstrtab	STRTAB	0x0	0x8634	0x24	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	0x8390	0x8390	6.0346	0x5	R E	0x8000	.text .rodata
LOAD	0x8390	0x18390	0x18390	0x2a4	0x2530	1.0590	0x6	RW	0x8000	.data .bss
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x7	RWE	0x4

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Jan 16, 2025 06:02:53.565366983 CET	43928	443	192.168.2.23	91.189.91.42
Jan 16, 2025 06:02:59.196641922 CET	42836	443	192.168.2.23	91.189.91.43
Jan 16, 2025 06:02:59.964585066 CET	42516	80	192.168.2.23	109.202.202.202
Jan 16, 2025 06:03:13.530618906 CET	43928	443	192.168.2.23	91.189.91.42
Jan 16, 2025 06:03:25.816941977 CET	42836	443	192.168.2.23	91.189.91.43
Jan 16, 2025 06:03:29.912358999 CET	42516	80	192.168.2.23	109.202.202.202
Jan 16, 2025 06:03:54.485012054 CET	43928	443	192.168.2.23	91.189.91.42

System Behavior

Analysis Process: dash PID: 6223, Parent PID: 4341

General

Start time (UTC):	05:02:48
Start date (UTC):	16/01/2025
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6223, Parent PID: 4341

General

Start time (UTC):	05:02:48
Start date (UTC):	16/01/2025
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.1aImyQcZQQ /tmp/tmp.eoLQpca8xb /tmp/tmp.fbWCndrAKI
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: dash PID: 6224, Parent PID: 4341

General

Start time (UTC):	05:02:48
Start date (UTC):	16/01/2025
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Chronological Activities

Analysis Process: rm PID: 6224, Parent PID: 4341

General

Start time (UTC):	05:02:48
Start date (UTC):	16/01/2025
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.1aImyQcZQQ /tmp/tmp.eoLQpca8xb /tmp/tmp.fbWCndrAKI
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

Chronological Activities

Analysis Process: dlr.arm5.elf PID: 6254, Parent PID: 6156

General

Start time (UTC):	05:02:53
Start date (UTC):	16/01/2025
Path:	/tmp/dlr.arm5.elf
Arguments:	/tmp/dlr.arm5.elf
File size:	4956856 bytes
MD5 hash:	5ebfcae4fe2471fcc5695c2394773ff1

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 enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system. Adversaries may use the information from File and Directory 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, Process: OS API Execution, Process: Process Creation
Platforms:	Linux, macOS, Network, 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.arm5.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

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: dash PID: 6223, Parent PID: 4341

General

Chronological Activities

Analysis Process: rm PID: 6223, Parent PID: 4341

General

Chronological Activities

Analysis Process: dash PID: 6224, Parent PID: 4341

General

Chronological Activities

Analysis Process: rm PID: 6224, Parent PID: 4341

General

Chronological Activities

Analysis Process: dlr.arm5.elf PID: 6254, Parent PID: 6156

General

Chronological Activities

Linux Analysis Report
dlr.arm5.elf