Malware Analysis Report

2025-01-18 21:27

Sample ID 240321-ygd4tage75
Target 4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2
SHA256 4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2
Tags
adware persistence stealer
score
8/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
8/10

SHA256

4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2

Threat Level: Likely malicious

The file 4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2 was found to be: Likely malicious.

Malicious Activity Summary

adware persistence stealer

Modifies Shared Task Scheduler registry keys

Installs/modifies Browser Helper Object

Drops file in System32 directory

Unsigned PE

Modifies registry class

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-21 19:45

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-21 19:45

Reported

2024-03-21 19:47

Platform

win7-20240221-en

Max time kernel

142s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1

Signatures

Modifies Shared Task Scheduler registry keys

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\SharedTaskScheduler\{52EB730C-730C-2EB7-30C9-D962EB740D95} C:\Windows\SysWOW64\rundll32.exe N/A

Installs/modifies Browser Helper Object

stealer adware
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{0C851EA6-1DA6-C851-DA63-730C951EA73F} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\ C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\NOOP.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\NOOP.dll C:\Windows\SysWOW64\rundll32.exe N/A
File created C:\Windows\SysWOW64\IIIJ.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\IIIJ.dll C:\Windows\SysWOW64\rundll32.exe N/A

Modifies registry class

Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95}\InprocServer32\ = "C:\\Windows\\SysWow64\\NOOP.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\InprocServer32\ = "C:\\Windows\\SysWow64\\IIIJ.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{0C851EA6-1DA6-C851-DA63-730C951EA73F}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{52EB730C-730C-2EB7-30C9-D962EB740D95} C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1192 wrote to memory of 2944 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1

Network

N/A

Files

memory/2944-0-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-1-0x0000000077BF0000-0x0000000077BF1000-memory.dmp

C:\Windows\SysWOW64\NOOP.dll

MD5 78f82703c28efdb3a11c140b987557dc
SHA1 82e6ca3c2b56f5132943f8c4f491aecda64276aa
SHA256 074f60a48f770aae040277f84995fa9d10cf45002baf4641d1a3ed52dc4d6daf
SHA512 db31097d3cb172ff1905ca54637d5082291ebf0cda27b770b8a476545a428934cf3338f5e18a1e66ffa21b93fe4e8df394aa0f98026948ecc0790f51332eb661

memory/2944-10-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-11-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-12-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-13-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-14-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-15-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-16-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-17-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-18-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-19-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-20-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-21-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-22-0x0000000000160000-0x00000000001BC000-memory.dmp

memory/2944-23-0x0000000000160000-0x00000000001BC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-03-21 19:45

Reported

2024-03-21 19:47

Platform

win10v2004-20231215-en

Max time kernel

141s

Max time network

122s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1

Signatures

Modifies Shared Task Scheduler registry keys

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler\{852DA730-963F-41EA-63FB-FC952FB741DA} C:\Windows\SysWOW64\rundll32.exe N/A

Installs/modifies Browser Helper Object

stealer adware
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{2FC841DA-30D9-EB84-0DA6-963FC952EB74} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\ C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\SysWOW64\WRMW.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\WRMW.dll C:\Windows\SysWOW64\rundll32.exe N/A
File created C:\Windows\SysWOW64\CXSB.dll C:\Windows\SysWOW64\rundll32.exe N/A
File opened for modification C:\Windows\SysWOW64\CXSB.dll C:\Windows\SysWOW64\rundll32.exe N/A

Modifies registry class

Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\InprocServer32\ = "C:\\Windows\\SysWow64\\CXSB.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\InprocServer32\ = "C:\\Windows\\SysWow64\\WRMW.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\ C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{2FC841DA-30D9-EB84-0DA6-963FC952EB74}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{852DA730-963F-41EA-63FB-FC952FB741DA}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2244 wrote to memory of 4332 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2244 wrote to memory of 4332 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2244 wrote to memory of 4332 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\4e1bfc80b0afeb98eb5f6ff0454b7059f252d13f99708b9617f1379c5683cda2.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 183.142.211.20.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 186.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 196.178.17.96.in-addr.arpa udp

Files

memory/4332-0-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-1-0x0000000077784000-0x0000000077785000-memory.dmp

C:\Windows\SysWOW64\WRMW.dll

MD5 d68d219b607eefc8bfe7fc6dbfca9b3c
SHA1 6a364f40df329f80c6107ec207ff41722198d0c8
SHA256 c1dfe969a71f81c5d87ab700e28413fb0cb30d30d15d65c242dbd50c1b772ebf
SHA512 89f7c9fc6282c6d848cb4a062c4afc872c6bc33a166bb3eed6196d24965a7fbf4441f4f2e6b739526c013eee5a9e8a0da912f5cf2272499803b71152a92a65b2

memory/4332-12-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-13-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-14-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-15-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-16-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-17-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-18-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-19-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-20-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-21-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-22-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-23-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-24-0x0000000000630000-0x000000000068C000-memory.dmp

memory/4332-25-0x0000000000630000-0x000000000068C000-memory.dmp