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Linux Analysis Report
dlr.sh4.elf

Overview

General Information

Sample name:	dlr.sh4.elf
Analysis ID:	1644394
MD5:	12b5ebcb0bafa4d97c39563425d3ef14
SHA1:	2f15d613284dcd9a5a4373fdef861c501794e6b8
SHA256:	2c1075ba22ea28284d24aed67fd3a1a4d194bc2bfa1bfcd3499f82bcac16ff8d
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	48
Range:	0 - 100

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:	42.0.0 Malachite
Analysis ID:	1644394
Start date and time:	2025-03-20 15:01:21 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 19s
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.sh4.elf
Detection:	MAL
Classification:	mal48.linELF@0/0@2/0

Runtime Messages

Command:	/tmp/dlr.sh4.elf
PID:	5510
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.sh4.elf (PID: 5510, Parent: 5436, MD5: 8943e5f8f8c280467b4472c15ae93ba9) Arguments: /tmp/dlr.sh4.elf

dash New Fork (PID: 5582, Parent: 3670)

rm (PID: 5582, Parent: 3670, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.0LzhoEqSOJ /tmp/tmp.pJ90DIyziu /tmp/tmp.Hcz5ZJixyh

dash New Fork (PID: 5583, Parent: 3670)

rm (PID: 5583, Parent: 3670, MD5: aa2b5496fdbfd88e38791ab81f90b95b) Arguments: rm -f /tmp/tmp.0LzhoEqSOJ /tmp/tmp.pJ90DIyziu /tmp/tmp.Hcz5ZJixyh

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

• AV Detection
• Networking
• System Summary
• Persistence and Installation Behavior
• Malware Analysis System Evasion

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: dlr.sh4.elf	Virustotal: Detection: 28%			Perma Link
Source: dlr.sh4.elf	ReversingLabs: Detection: 38%

Source: unknown	UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown	UDP traffic detected without corresponding DNS query: 1.1.1.1

Source: global traffic

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

Source: unknown	Network traffic detected: HTTP traffic on port 49566 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 443 -> 49566

Source: ELF static info symbol of initial sample

.symtab present: no

Source: classification engine

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

Source: /usr/bin/dash (PID: 5582)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.0LzhoEqSOJ /tmp/tmp.pJ90DIyziu /tmp/tmp.Hcz5ZJixyh			Jump to behavior
Source: /usr/bin/dash (PID: 5583)	Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.0LzhoEqSOJ /tmp/tmp.pJ90DIyziu /tmp/tmp.Hcz5ZJixyh			Jump to behavior

Source: /tmp/dlr.sh4.elf (PID: 5510)

Queries kernel information via 'uname':

Jump to behavior

Source: dlr.sh4.elf, 5510.1.00007fff9541f000.00007fff95440000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-sh4
Source: dlr.sh4.elf, 5510.1.00007fff9541f000.00007fff95440000.rw-.sdmp	Binary or memory string: _hx86_64/usr/bin/qemu-sh4/tmp/dlr.sh4.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.sh4.elf
Source: dlr.sh4.elf, 5510.1.000056358bc5d000.000056358bc9f000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/sh4
Source: dlr.sh4.elf, 5510.1.000056358bc5d000.000056358bc9f000.rw-.sdmp	Binary or memory string: 5V5!/etc/qemu-binfmt/sh4

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 Non-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	2 Application Layer Protocol	Automated Exfiltration	Data Encrypted for Impact

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

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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.sh4.elf	29%	Virustotal		Browse
dlr.sh4.elf	39%	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

Name	IP	Active	Malicious	Antivirus Detection	Reputation
daisy.ubuntu.com	162.213.35.25	true	false		high

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
54.217.10.153	unknown	United States		16509	AMAZON-02US	false

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link
54.217.10.153	i686.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	miner.elf	Get hash	malicious	Unknown	Browse
	psmips.elf	Get hash	malicious	Unknown	Browse
	yakuza.m68k.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	main_x86.elf	Get hash	malicious	Mirai	Browse
	jkse.arm7.elf	Get hash	malicious	Mirai	Browse
	re.bot.mips.elf	Get hash	malicious	Unknown	Browse
	45.126.126.33-sora.arm-2025-03-12T01_48_26.elf	Get hash	malicious	Mirai	Browse
	efea6.elf	Get hash	malicious	Mirai	Browse
	tftp.elf	Get hash	malicious	Unknown	Browse

Domains

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
daisy.ubuntu.com	arc.elf	Get hash	malicious	Mirai	Browse	162.213.35.24
	dlr.spc.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	dlr.ppc.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	sh4.elf	Get hash	malicious	Gafgyt, Mirai	Browse	162.213.35.25
	mips.elf	Get hash	malicious	Gafgyt, Mirai	Browse	162.213.35.25
	x86.elf	Get hash	malicious	Gafgyt, Mirai	Browse	162.213.35.24
	resgod.spc.elf	Get hash	malicious	Mirai	Browse	162.213.35.25
	m68k.elf	Get hash	malicious	Gafgyt, Mirai	Browse	162.213.35.24
	i686.elf	Get hash	malicious	Gafgyt, Mirai	Browse	162.213.35.24
	miner.elf	Get hash	malicious	Unknown	Browse	162.213.35.25

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
AMAZON-02US	dlr.mips.elf	Get hash	malicious	Unknown	Browse	34.249.145.219
	x86_64.elf	Get hash	malicious	Mirai	Browse	52.78.126.253
	dlr.arm.elf	Get hash	malicious	Unknown	Browse	34.249.145.219
	https://drive.google.com/file/d/1YZImPeFy9OTIvMvYmUyiIlXPlnFTsmR2/view?usp=sharing	Get hash	malicious	Unknown	Browse	54.231.203.201
	https://krunk.basalikum.top/	Get hash	malicious	HTMLPhisher	Browse	108.138.106.84
	https://eu.knowbe4.com/ui/login/dG9stLnBoaWsxsaXBzQHglmbWsVwmLmNvmbQ==	Get hash	malicious	KnowBe4	Browse	13.225.63.110
	i686.elf	Get hash	malicious	Gafgyt, Mirai	Browse	54.217.10.153
	na.elf	Get hash	malicious	Prometei	Browse	54.255.164.76
	miner.elf	Get hash	malicious	Unknown	Browse	34.254.182.186
	https://protect2.fireeye.com/v1/url?k=31323334-501d2dca-3114f648-454455534531-f18bcc46852af03b&q=1&e=a5b004d0-9ad2-44a3-a203-9d7fb71ea4db&u=https%3A%2F%2Fhyj48i39.s3.us-east-1.amazonaws.com%2Fdocnwhdheb.html	Get hash	malicious	HTMLPhisher	Browse	108.138.106.48

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, Renesas SH, version 1 (SYSV), statically linked, stripped
Entropy (8bit):	5.437895514901329
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	dlr.sh4.elf
File size:	1'192 bytes
MD5:	12b5ebcb0bafa4d97c39563425d3ef14
SHA1:	2f15d613284dcd9a5a4373fdef861c501794e6b8
SHA256:	2c1075ba22ea28284d24aed67fd3a1a4d194bc2bfa1bfcd3499f82bcac16ff8d
SHA512:	d10605a09c9ea98dfca3efc9e87cdd496910e3987d25aa641071ce5c2a7cb5f38d8737e6d194afe6c31ee603a1f90630946f3669260502a3d37c9aad01767f0a
SSDEEP:	24:wCVm4llns9wdGtSnUpzzbBWpzmK+R1eKD5gDrmWvGgkC7m172Nfu:wal/sOdxnUpzzbBWpzmK+xODrmWvGg7q
TLSH:	8B213242B1C59DA8CF18D73C8AB11B507F06D524C85BE3CE0F0C5BB5692F28C6994094
File Content Preview:	.ELF..............*.......@.4...........4. ...(...............@...@...........................A...A.................Q.td............................\e..(E./.D.nK%lf\|g['.F{&c`.@..cc.Ccb<c.&)B(C.F.B; k"+ .o.n............Ce./...n.o.n+A....0.@...Ce./...n.o.n+

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	<unknown>
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x40031c
Flags:	0x16
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
Section Header Offset:	992
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	0x400094	0x94	0x2ec	0x0	0x6	AX	4
.rodata	PROGBITS	0x400380	0x380	0x40	0x1	0x32	AMS	4
.bss	NOBITS	0x4103c0	0x3c0	0x8	0x0	0x3	WA	4
.shstrtab	STRTAB	0x0	0x3c0	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	0x400000	0x400000	0x3c0	0x3c0	5.9551	0x5	R E	0x10000	.text .rodata
LOAD	0x3c0	0x4103c0	0x4103c0	0x0	0x8	0.0000	0x6	RW	0x10000	.bss
GNU_STACK	0x0	0x0	0x0	0x0	0x0	0.0000	0x6	RW	0x4

Network Behavior

Download Network PCAP: filtered – full

Network Port Distribution

Total Packets: 4
• 443 (HTTPS)
• 53 (DNS)

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Mar 20, 2025 15:02:03.565551996 CET	49566	443	192.168.2.15	54.217.10.153
Mar 20, 2025 15:02:28.580735922 CET	49566	443	192.168.2.15	54.217.10.153
Mar 20, 2025 15:02:28.805850983 CET	443	49566	54.217.10.153	192.168.2.15

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Mar 20, 2025 15:02:00.273725986 CET	39246	53	192.168.2.15	1.1.1.1
Mar 20, 2025 15:02:00.273725986 CET	32906	53	192.168.2.15	1.1.1.1
Mar 20, 2025 15:02:00.374680996 CET	53	39246	1.1.1.1	192.168.2.15
Mar 20, 2025 15:02:00.377922058 CET	53	32906	1.1.1.1	192.168.2.15

DNS Queries

Timestamp	Source IP	Dest IP	Trans ID	OP Code	Name	Type	Class	DNS over HTTPS
Mar 20, 2025 15:02:00.273725986 CET	192.168.2.15	1.1.1.1	0xbba1	Standard query (0)	daisy.ubuntu.com	A (IP address)	IN (0x0001)	false
Mar 20, 2025 15:02:00.273725986 CET	192.168.2.15	1.1.1.1	0xb8c	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 20, 2025 15:02:00.374680996 CET	1.1.1.1	192.168.2.15	0xbba1	No error (0)	daisy.ubuntu.com		162.213.35.25	A (IP address)	IN (0x0001)	false
Mar 20, 2025 15:02:00.374680996 CET	1.1.1.1	192.168.2.15	0xbba1	No error (0)	daisy.ubuntu.com		162.213.35.24	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: dlr.sh4.elf PID: 5510, Parent PID: 5436

General

Start time (UTC):	14:01:58
Start date (UTC):	20/03/2025
Path:	/tmp/dlr.sh4.elf
Arguments:	/tmp/dlr.sh4.elf
File size:	4139976 bytes
MD5 hash:	8943e5f8f8c280467b4472c15ae93ba9

File Activities

File Opened

File Read

Process Activities

Thread Sleep

System Activities

Query System Information (uname)

Chronological Activities

Analysis Process: dash PID: 5582, Parent PID: 3670

General

Start time (UTC):	14:02:27
Start date (UTC):	20/03/2025
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Process Activities

Process Overlayed (Exec)

Chronological Activities

Analysis Process: rm PID: 5582, Parent PID: 3670

General

Start time (UTC):	14:02:27
Start date (UTC):	20/03/2025
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.0LzhoEqSOJ /tmp/tmp.pJ90DIyziu /tmp/tmp.Hcz5ZJixyh
File size:	72056 bytes
MD5 hash:	aa2b5496fdbfd88e38791ab81f90b95b

File Activities

File Opened

File Deleted

File Read

Chronological Activities

Analysis Process: dash PID: 5583, Parent PID: 3670

General

Start time (UTC):	14:02:27
Start date (UTC):	20/03/2025
Path:	/usr/bin/dash
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Process Activities

Process Overlayed (Exec)

Chronological Activities

Analysis Process: rm PID: 5583, Parent PID: 3670

General

Start time (UTC):	14:02:27
Start date (UTC):	20/03/2025
Path:	/usr/bin/rm
Arguments:	rm -f /tmp/tmp.0LzhoEqSOJ /tmp/tmp.pJ90DIyziu /tmp/tmp.Hcz5ZJixyh
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 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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Warning!

Linux Analysis Report dlr.sh4.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

UDP Packets

DNS Queries

DNS Answers

System Behavior

Analysis Process: dlr.sh4.elf PID: 5510, Parent PID: 5436

General

File Activities

File Opened

File Read

Process Activities

Thread Sleep

System Activities

Query System Information (uname)

Chronological Activities

Analysis Process: dash PID: 5582, Parent PID: 3670

General

Process Activities

Process Overlayed (Exec)

Chronological Activities

Analysis Process: rm PID: 5582, Parent PID: 3670

General

File Activities

File Opened

File Deleted

File Read

Chronological Activities

Linux Analysis Report
dlr.sh4.elf