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Linux Analysis Report
zersh4.elf

Overview

General Information

Sample name:	zersh4.elf
Analysis ID:	1580189
MD5:	7475341fd60a61765cfdead32577e63d
SHA1:	7a9431cdbc301834086c062390f5505a67731290
SHA256:	59cf733d8bc6be41eca3211640666bdd438614dc4f8d3f1dfc6712a5fc3d9884
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	52
Range:	0 - 100
Whitelisted:	false

Signatures

Multi AV Scanner detection for submitted file

Connects to many ports of the same IP (likely port scanning)

Detected TCP or UDP traffic on non-standard ports

Sample contains strings indicative of BusyBox which embeds multiple Unix commands in a single executable

Sample has stripped symbol table

Sample listens on a socket

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

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1580189
Start date and time:	2024-12-24 04:00:40 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 37s
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:	zersh4.elf
Detection:	MAL
Classification:	mal52.troj.linELF@0/0@1/0

Runtime Messages

Command:	/tmp/zersh4.elf
PID:	5540
Exit Code:	0
Exit Code Info:
Killed:	False
Standard Output:	The Peoples Bank of China.
Standard Error:

Process Tree

system is lnxubuntu20

zersh4.elf (PID: 5540, Parent: 5460, MD5: 8943e5f8f8c280467b4472c15ae93ba9) Arguments: /tmp/zersh4.elf

zersh4.elf New Fork (PID: 5542, Parent: 5540)

zersh4.elf New Fork (PID: 5544, Parent: 5542)

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: zersh4.elf

ReversingLabs: Detection: 28%

Networking

Connects to many ports of the same IP (likely port scanning)

Source: global traffic

TCP traffic: 209.38.192.73 ports 38241,1,2,3,4,8

Source: global traffic

TCP traffic: 192.168.2.14:37084 -> 209.38.192.73:38241

Source: /tmp/zersh4.elf (PID: 5540)

Socket: 127.0.0.1:39148

Jump to behavior

Source: unknown

UDP traffic detected without corresponding DNS query: 185.181.61.24

Source: global traffic

DNS traffic detected: DNS query: serisontop.dyn

Source: Initial sample	String containing 'busybox' found: /bin/busybox echo -ne
Source: Initial sample	String containing 'busybox' found: /bin/busybox echo -ne >> > .d

Source: ELF static info symbol of initial sample

.symtab present: no

Source: classification engine

Classification label: mal52.troj.linELF@0/0@1/0

Source: /tmp/zersh4.elf (PID: 5540)

Queries kernel information via 'uname':

Jump to behavior

Source: zersh4.elf, 5540.1.00007fff9a9fd000.00007fff9aa1e000.rw-.sdmp	Binary or memory string: \x86_64/usr/bin/qemu-sh4/tmp/zersh4.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/zersh4.elf
Source: zersh4.elf, 5540.1.00007fff9a9fd000.00007fff9aa1e000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-sh4
Source: zersh4.elf, 5540.1.000055871aa7b000.000055871aade000.rw-.sdmp	Binary or memory string: U5!/etc/qemu-binfmt/sh4
Source: zersh4.elf, 5540.1.000055871aa7b000.000055871aade000.rw-.sdmp	Binary or memory string: /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	Direct Volume Access	OS Credential Dumping	11 Security Software Discovery	Remote Services	Data from Local System	1 Non-Standard Port	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	1 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

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
zersh4.elf	29%	ReversingLabs	Linux.Backdoor.Gafgyt

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Contacted Domains

Name	IP	Active	Malicious	Antivirus Detection	Reputation
serisontop.dyn	154.216.16.250	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
209.38.192.73	unknown	United States		7018	ATT-INTERNET4US	true

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link
209.38.192.73	zerspc.elf	Get hash	malicious	Unknown	Browse
	zerm68k.elf	Get hash	malicious	Unknown	Browse
	zermpsl.elf	Get hash	malicious	Unknown	Browse
	zerarm.elf	Get hash	malicious	Unknown	Browse
	zerx86.elf	Get hash	malicious	Unknown	Browse

Domains

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
serisontop.dyn	nklm68k.elf	Get hash	malicious	Unknown	Browse	154.216.16.244
	nabmpsl.elf	Get hash	malicious	Unknown	Browse	154.216.16.250
	splmpsl.elf	Get hash	malicious	Unknown	Browse	209.38.192.73
	nabmips.elf	Get hash	malicious	Unknown	Browse	209.38.192.73
	splppc.elf	Get hash	malicious	Unknown	Browse	154.216.16.250
	jklx86.elf	Get hash	malicious	Unknown	Browse	154.216.16.244
	nklmpsl.elf	Get hash	malicious	Unknown	Browse	154.216.16.250
	arm.elf	Get hash	malicious	Unknown	Browse	154.216.16.244
	jklmips.elf	Get hash	malicious	Unknown	Browse	154.216.16.250
	zerspc.elf	Get hash	malicious	Unknown	Browse	209.38.192.73

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
ATT-INTERNET4US	nklm68k.elf	Get hash	malicious	Unknown	Browse	70.254.163.117
	nabmpsl.elf	Get hash	malicious	Unknown	Browse	12.178.23.37
	splmpsl.elf	Get hash	malicious	Unknown	Browse	76.240.173.144
	nabmips.elf	Get hash	malicious	Unknown	Browse	13.141.6.166
	arm7.elf	Get hash	malicious	Unknown	Browse	99.185.12.79
	jklx86.elf	Get hash	malicious	Unknown	Browse	12.140.118.169
	nklmpsl.elf	Get hash	malicious	Unknown	Browse	63.196.53.0
	arm.elf	Get hash	malicious	Unknown	Browse	67.37.29.135
	jklmips.elf	Get hash	malicious	Unknown	Browse	75.12.20.197
	zerspc.elf	Get hash	malicious	Unknown	Browse	209.38.192.73

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):	6.75882966764686
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	zersh4.elf
File size:	42'224 bytes
MD5:	7475341fd60a61765cfdead32577e63d
SHA1:	7a9431cdbc301834086c062390f5505a67731290
SHA256:	59cf733d8bc6be41eca3211640666bdd438614dc4f8d3f1dfc6712a5fc3d9884
SHA512:	0da7638574cbffc2e2e5f2527f0f633e1b28278f58a43ba72d2f6413680660bf1b430d93aeefb802fe118305d8d6e6434cc9a05b075f2e631916be44ff7bdc4a
SSDEEP:	768:QaNwtOc6z8WekUjk+4X9PEE4MZEjUrCxXoODMCXQT:QaNwtOVtJX9MEn0Ur8YcMCXQT
TLSH:	06136DB7D8AEAD94C18D5274E4709E746F13F200D2631EFB594588BA8043AACF60E7F5
File Content Preview:	.ELF.....................@.4...8.......4. ...(...............@...@.t...t...............x...x.A.x.A.\|...............Q.td............................././"O.n........#.@........#.*@.....o&O.n...l..............................././.../.a"O.!...n...a.b("...q.

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:	0x4001a0
Flags:	0x9
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
Number of Program Headers:	3
Section Header Offset:	41784
Section Header Size:	40
Number of Section Headers:	11
Header String Table Index:	10

Sections

Name	Type	Address	Offset	Size	EntSize	Flags	Flags Description	Align
	NULL	0x0	0x0	0x0	0x0	0x0		0
.init	PROGBITS	0x400094	0x94	0x30	0x0	0x6	AX	4
.text	PROGBITS	0x4000e0	0xe0	0x9920	0x0	0x6	AX	32
.fini	PROGBITS	0x409a00	0x9a00	0x24	0x0	0x6	AX	4
.rodata	PROGBITS	0x409a24	0x9a24	0x750	0x0	0x2	A	4
.ctors	PROGBITS	0x41a178	0xa178	0x8	0x0	0x3	WA	4
.dtors	PROGBITS	0x41a180	0xa180	0x8	0x0	0x3	WA	4
.jcr	PROGBITS	0x41a188	0xa188	0x4	0x0	0x3	WA	4
.data	PROGBITS	0x41a18c	0xa18c	0x168	0x0	0x3	WA	4
.bss	NOBITS	0x41a2f4	0xa2f4	0x178	0x0	0x3	WA	4
.shstrtab	STRTAB	0x0	0xa2f4	0x43	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	0xa174	0xa174	6.8185	0x5	R E	0x10000	.init .text .fini .rodata
LOAD	0xa178	0x41a178	0x41a178	0x17c	0x2f4	0.8961	0x6	RW	0x10000	.ctors .dtors .jcr .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
Dec 24, 2024 04:01:38.950690031 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:01:39.070178986 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:01:39.070379019 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:01:39.071274996 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:01:39.190884113 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:01:39.190999031 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:01:39.310482025 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:01:49.081490040 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:01:49.200913906 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:01:49.504801035 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:01:49.504921913 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:02:49.542227030 CET	37084	38241	192.168.2.14	209.38.192.73
Dec 24, 2024 04:02:49.662519932 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:02:49.965883970 CET	38241	37084	209.38.192.73	192.168.2.14
Dec 24, 2024 04:02:49.965964079 CET	37084	38241	192.168.2.14	209.38.192.73

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Dec 24, 2024 04:01:38.693207026 CET	54719	53	192.168.2.14	185.181.61.24
Dec 24, 2024 04:01:38.949628115 CET	53	54719	185.181.61.24	192.168.2.14

DNS Queries

Timestamp	Source IP	Dest IP	Trans ID	OP Code	Name	Type	Class	DNS over HTTPS
Dec 24, 2024 04:01:38.693207026 CET	192.168.2.14	185.181.61.24	0x4468	Standard query (0)	serisontop.dyn	A (IP address)	IN (0x0001)	false

DNS Answers

Timestamp	Source IP	Dest IP	Trans ID	Reply Code	Name	Address	Type	Class	DNS over HTTPS
Dec 24, 2024 04:01:38.949628115 CET	185.181.61.24	192.168.2.14	0x4468	No error (0)	serisontop.dyn	154.216.16.250	A (IP address)	IN (0x0001)	false
Dec 24, 2024 04:01:38.949628115 CET	185.181.61.24	192.168.2.14	0x4468	No error (0)	serisontop.dyn	209.38.192.73	A (IP address)	IN (0x0001)	false
Dec 24, 2024 04:01:38.949628115 CET	185.181.61.24	192.168.2.14	0x4468	No error (0)	serisontop.dyn	154.216.16.244	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: zersh4.elf PID: 5540, Parent PID: 5460

General

Start time (UTC):	03:01:38
Start date (UTC):	24/12/2024
Path:	/tmp/zersh4.elf
Arguments:	/tmp/zersh4.elf
File size:	4139976 bytes
MD5 hash:	8943e5f8f8c280467b4472c15ae93ba9

Chronological Activities

Analysis Process: zersh4.elf PID: 5542, Parent PID: 5540

General

Start time (UTC):	03:01:38
Start date (UTC):	24/12/2024
Path:	/tmp/zersh4.elf
Arguments:	-
File size:	4139976 bytes
MD5 hash:	8943e5f8f8c280467b4472c15ae93ba9

Chronological Activities

Analysis Process: zersh4.elf PID: 5544, Parent PID: 5542

General

Start time (UTC):	03:01:38
Start date (UTC):	24/12/2024
Path:	/tmp/zersh4.elf
Arguments:	-
File size:	4139976 bytes
MD5 hash:	8943e5f8f8c280467b4472c15ae93ba9

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 communicate using a protocol and port pairing that are typically not associated. For example, HTTPS over port 8088or port 587as opposed to the traditional port 443. Adversaries may make changes to the standard port used by a protocol to bypass filtering or muddle analysis/parsing of network data.
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 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 zersh4.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

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: zersh4.elf PID: 5540, Parent PID: 5460

General

Chronological Activities

Analysis Process: zersh4.elf PID: 5542, Parent PID: 5540

General

Chronological Activities

Analysis Process: zersh4.elf PID: 5544, Parent PID: 5542

General

Chronological Activities

Linux Analysis Report
zersh4.elf