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Linux Analysis Report
dlr.x86.elf

Overview

General Information

Sample name:	dlr.x86.elf
Analysis ID:	1644397
MD5:	9bf6edd0e616fccab3ed88cfceb9195b
SHA1:	f26d85284f33f09722487aeffaa08cde36e80496
SHA256:	945e08108f98a85e02f6d28f22dde11071cd1b0b1658463808acb0aa7e29129f
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	56
Range:	0 - 100

Signatures

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Creates hidden files and/or directories

Creates hidden files without content (potentially used as a mutex)

HTTP GET or POST without a user agent

Sample has stripped symbol table

Yara signature match

Classification

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1644397
Start date and time:	2025-03-20 15:11:15 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 56s
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.x86.elf
Detection:	MAL
Classification:	mal56.linELF@0/0@0/0

Runtime Messages

Command:	/tmp/dlr.x86.elf
PID:	5552
Exit Code:	4
Exit Code Info:
Killed:	False
Standard Output:	AAA
Standard Error:

Process Tree

system is lnxubuntu20

dlr.x86.elf (PID: 5552, Parent: 5471, MD5: 9bf6edd0e616fccab3ed88cfceb9195b) Arguments: /tmp/dlr.x86.elf

cleanup

Yara Signatures

Initial Sample

Source	Rule	Description	Author	Strings
dlr.x86.elf	Linux_Trojan_Mirai_88a1b067	unknown	unknown	0x91:$a: 00 00 00 55 89 E5 0F B6 55 08 0F B6 45 0C C1 E2 18 C1 E0 10

Memory Dumps

Source	Rule	Description	Author	Strings
5552.1.0000000008048000.0000000008049000.r-x.sdmp	Linux_Trojan_Mirai_88a1b067	unknown	unknown	0x91:$a: 00 00 00 55 89 E5 0F B6 55 08 0F B6 45 0C C1 E2 18 C1 E0 10
5552.1.0000000008049000.000000000804a000.rw-.sdmp	Linux_Trojan_Mirai_88a1b067	unknown	unknown	0x91:$a: 00 00 00 55 89 E5 0F B6 55 08 0F B6 45 0C C1 E2 18 C1 E0 10

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

• AV Detection
• Networking
• System Summary
• Persistence and Installation Behavior

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: dlr.x86.elf	Virustotal: Detection: 32%			Perma Link
Source: dlr.x86.elf	ReversingLabs: Detection: 47%

Source: global traffic

HTTP traffic detected: GET /bins/x86 HTTP/Data Raw: Data Ascii:

Source: unknown	TCP traffic detected without corresponding DNS query: 156.253.227.12
Source: unknown	TCP traffic detected without corresponding DNS query: 156.253.227.12
Source: unknown	TCP traffic detected without corresponding DNS query: 156.253.227.12
Source: unknown	TCP traffic detected without corresponding DNS query: 156.253.227.12
Source: unknown	TCP traffic detected without corresponding DNS query: 156.253.227.12
Source: unknown	TCP traffic detected without corresponding DNS query: 156.253.227.12

Source: global traffic

HTTP traffic detected: GET /bins/x86 HTTP/Data Raw: Data Ascii:

System Summary

Malicious sample detected (through community Yara rule)

Source: dlr.x86.elf, type: SAMPLE	Matched rule: Linux_Trojan_Mirai_88a1b067 Author: unknown
Source: 5552.1.0000000008048000.0000000008049000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_88a1b067 Author: unknown
Source: 5552.1.0000000008049000.000000000804a000.rw-.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_88a1b067 Author: unknown

Source: ELF static info symbol of initial sample

.symtab present: no

Source: dlr.x86.elf, type: SAMPLE	Matched rule: Linux_Trojan_Mirai_88a1b067 severity = 100, os = linux, arch_context = x86, creation_date = 2021-06-28, scan_context = file, memory, reference = 1a62db02343edda916cbbf463d8e07ec2ad4509fd0f15a5f6946d0ec6c332dd9, license = Elastic License v2, threat_name = Linux.Trojan.Mirai, fingerprint = b32b42975297aed7cef72668ee272a5cfb753dce7813583f0c3ec91e52f8601f, id = 88a1b067-11d5-4128-b763-2d1747c95eef, last_modified = 2021-09-16
Source: 5552.1.0000000008048000.0000000008049000.r-x.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_88a1b067 severity = 100, os = linux, arch_context = x86, creation_date = 2021-06-28, scan_context = file, memory, reference = 1a62db02343edda916cbbf463d8e07ec2ad4509fd0f15a5f6946d0ec6c332dd9, license = Elastic License v2, threat_name = Linux.Trojan.Mirai, fingerprint = b32b42975297aed7cef72668ee272a5cfb753dce7813583f0c3ec91e52f8601f, id = 88a1b067-11d5-4128-b763-2d1747c95eef, last_modified = 2021-09-16
Source: 5552.1.0000000008049000.000000000804a000.rw-.sdmp, type: MEMORY	Matched rule: Linux_Trojan_Mirai_88a1b067 severity = 100, os = linux, arch_context = x86, creation_date = 2021-06-28, scan_context = file, memory, reference = 1a62db02343edda916cbbf463d8e07ec2ad4509fd0f15a5f6946d0ec6c332dd9, license = Elastic License v2, threat_name = Linux.Trojan.Mirai, fingerprint = b32b42975297aed7cef72668ee272a5cfb753dce7813583f0c3ec91e52f8601f, id = 88a1b067-11d5-4128-b763-2d1747c95eef, last_modified = 2021-09-16

Source: classification engine

Classification label: mal56.linELF@0/0@0/0

Source: /tmp/dlr.x86.elf (PID: 5552)

File: /tmp/.2351

Jump to behavior

Source: /tmp/dlr.x86.elf (PID: 5552)

Empty hidden file: /tmp/.2351

Jump to behavior

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 Hide Artifacts	OS Credential Dumping	System Service 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	1 Hidden Files and Directories	LSASS Memory	Application Window Discovery	Remote Desktop Protocol	Data from Removable Media	1 Application Layer Protocol	Exfiltration Over Bluetooth	Network Denial of Service
Email Addresses	DNS Server	Domain Accounts	At	Logon Script (Windows)	Logon Script (Windows)	Obfuscated Files or Information	Security Account Manager	Query Registry	SMB/Windows Admin Shares	Data from Network Shared Drive	1 Ingress Tool Transfer	Automated Exfiltration	Data Encrypted for Impact

Malware Configuration

⊘No configs have been found

Behavior Graph

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Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Number of created Files
Is malicious
Internet

Screenshots

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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.x86.elf	32%	Virustotal		Browse
dlr.x86.elf	47%	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	Flag	ASN	ASN Name	Malicious
156.253.227.12	unknown	Seychelles		132839	POWERLINE-AS-APPOWERLINEDATACENTERHK	false

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
156.253.227.12	dlr.mpsl.elf	Get hash	malicious	Unknown	Browse	/bins/mpsl
	dlr.arm6.elf	Get hash	malicious	Unknown	Browse	/bins/arm6
	dlr.mips.elf	Get hash	malicious	Unknown	Browse	/bins/mips

Domains

⊘No context

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
POWERLINE-AS-APPOWERLINEDATACENTERHK	dlr.mpsl.elf	Get hash	malicious	Unknown	Browse	156.253.227.12
	dlr.arm6.elf	Get hash	malicious	Unknown	Browse	156.253.227.12
	dlr.mips.elf	Get hash	malicious	Unknown	Browse	156.253.227.12
	hoho.sparc.elf	Get hash	malicious	Unknown	Browse	45.202.220.126
	dokument wysy#U00c5 kowy faktury nr 52-FK-25.js	Get hash	malicious	FormBook	Browse	45.202.215.236
	dokument wysy#U00c5 kowy faktury nr 52-FK-25.js	Get hash	malicious	FormBook	Browse	45.202.215.236
	EU-Business-Register 2024-2025#U00b7pdf.vbs	Get hash	malicious	FormBook, GuLoader	Browse	160.124.31.74
	ID2025-019#U00b7pdf.vbs	Get hash	malicious	FormBook, GuLoader	Browse	160.124.31.74
	PE2025-019#U00b7pdf.vbs	Get hash	malicious	FormBook, GuLoader	Browse	160.124.31.74
	splspc.elf	Get hash	malicious	Unknown	Browse	154.193.113.237

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, Intel 80386, version 1 (SYSV), statically linked, stripped
Entropy (8bit):	5.438643962626416
TrID:	ELF Executable and Linkable format (Linux) (4029/14) 50.16% ELF Executable and Linkable format (generic) (4004/1) 49.84%
File name:	dlr.x86.elf
File size:	1'180 bytes
MD5:	9bf6edd0e616fccab3ed88cfceb9195b
SHA1:	f26d85284f33f09722487aeffaa08cde36e80496
SHA256:	945e08108f98a85e02f6d28f22dde11071cd1b0b1658463808acb0aa7e29129f
SHA512:	7ba79c4e39845037183b425cadd683889e117738ef19c9b7f05efcf80ee6be9d0b05c82ba6c11084ee6433ad911de71d524e245f75b3e5b199c2ac6e1e9db535
SSDEEP:	24:FlqMoJFHxgxEmceZGQleZ3eLjSJvd1wyGues9O7UruQQBVNfRh:fqxL+coGQlo3eLjYFxqss7IHQPN5h
TLSH:	6C21C2A7E1D4ED32D76200F662C6EF5723A5CE956016FF0B8A515402DD3A6D4C133274
File Content Preview:	.ELF....................$...4...........4. ...(.....................................................................Q.td............................U....U...E...........M...E........].....................................U......u.j..D........U......u.j../.

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	Intel 80386
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x8048324
Flags:	0x0
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
Section Header Offset:	980
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	0x8048094	0x94	0x2e9	0x0	0x6	AX	4
.rodata	PROGBITS	0x804837d	0x37d	0x34	0x1	0x32	AMS	1
.bss	NOBITS	0x80493b4	0x3b4	0x4	0x0	0x3	WA	4
.shstrtab	STRTAB	0x0	0x3b4	0x1e	0x0	0x0		1

Program Segments

Type	Offset	Virtual Address	Physical Address	File Size	Memory Size	Entropy	Flags	Flags Description	Align	Section Mappings
LOAD	0x0	0x8048000	0x8048000	0x3b1	0x3b1	5.8617	0x5	R E	0x1000	.text .rodata
LOAD	0x3b4	0x80493b4	0x80493b4	0x0	0x4	0.0000	0x6	RW	0x1000	.bss
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x6	RW	0x4

Network Behavior

Download Network PCAP: filtered – full

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Mar 20, 2025 15:12:16.415333033 CET	39034	80	192.168.2.14	156.253.227.12
Mar 20, 2025 15:12:17.429341078 CET	39034	80	192.168.2.14	156.253.227.12
Mar 20, 2025 15:12:17.632602930 CET	80	39034	156.253.227.12	192.168.2.14
Mar 20, 2025 15:12:17.632885933 CET	39034	80	192.168.2.14	156.253.227.12
Mar 20, 2025 15:12:17.633915901 CET	39034	80	192.168.2.14	156.253.227.12
Mar 20, 2025 15:12:17.835814953 CET	80	39034	156.253.227.12	192.168.2.14
Mar 20, 2025 15:12:38.361464977 CET	80	39034	156.253.227.12	192.168.2.14
Mar 20, 2025 15:12:38.364425898 CET	39034	80	192.168.2.14	156.253.227.12
Mar 20, 2025 15:12:38.367685080 CET	39034	80	192.168.2.14	156.253.227.12
Mar 20, 2025 15:12:38.581732035 CET	80	39034	156.253.227.12	192.168.2.14

HTTP Packets

Session ID	Source IP	Source Port	Destination IP	Destination Port
0	192.168.2.14	39034	156.253.227.12	80

Timestamp	Bytes transferred	Direction	Data
Mar 20, 2025 15:12:17.633915901 CET	32	OUT	GET /bins/x86 HTTP/ Data Raw: Data Ascii:

System Behavior

Analysis Process: dlr.x86.elf PID: 5552, Parent PID: 5471

General

Start time (UTC):	14:12:16
Start date (UTC):	20/03/2025
Path:	/tmp/dlr.x86.elf
Arguments:	/tmp/dlr.x86.elf
File size:	1180 bytes
MD5 hash:	9bf6edd0e616fccab3ed88cfceb9195b

Description:	Adversaries may attempt to hide artifacts associated with their behaviors to evade detection. Operating systems may have features to hide various artifacts, such as important system files and administrative task execution, to avoid disrupting user work environments and prevent users from changing files or features on the system. Adversaries may abuse these features to hide artifacts such as files, directories, user accounts, or other system activity to evade detection.
Tactics:	Defense Evasion
Data Sources:	Application Log: Application Log Content, Command: Command Execution, File: File Creation, File: File Metadata, File: File Modification, Firmware: Firmware Modification, Process: OS API Execution, Process: Process Creation, Script: Script Execution, Service: Service Creation, User Account: User Account Creation, User Account: User Account Metadata, Windows Registry: Windows Registry Key Modification
Platforms:	Linux, macOS, Office 365, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may set files and directories to be hidden to evade detection mechanisms. To prevent normal users from accidentally changing special files on a system, most operating systems have the concept of a ‘hidden’ file. These files don’t show up when a user browses the file system with a GUI or when using normal commands on the command line. Users must explicitly ask to show the hidden files either via a series of Graphical User Interface (GUI) prompts or with command line switches ( `dir /a` for Windows and `ls –a` for Linux and macOS).
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Creation, File: File Metadata, Process: Process Creation
Platforms:	Linux, macOS, 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

Description:	Adversaries may transfer tools or other files from an external system into a compromised environment. Tools or files may be copied from an external adversary-controlled system to the victim network through the command and control channel or through alternate protocols such as ftp . Once present, adversaries may also transfer/spread tools between victim devices within a compromised environment (i.e. Lateral Tool Transfer ).
Tactics:	Command and Control
Data Sources:	Command: Command Execution, File: File Creation, Network Traffic: Network Connection Creation, 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.x86.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Runtime Messages

Process Tree

Yara Signatures

Initial Sample

Memory Dumps

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

Persistence and Installation Behavior

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

TCP Packets

HTTP Packets

System Behavior

Analysis Process: dlr.x86.elf PID: 5552, Parent PID: 5471

General

File Activities

File Opened

Chronological Activities

Linux Analysis Report
dlr.x86.elf