Malware Analysis Report

2025-01-18 21:45

Sample ID 240414-1vrceaeg37
Target ef9ab2023977e956d28040b05d00703c_JaffaCakes118
SHA256 0c91706d6fecc4bad18e1e0b527e8bf1ffa13befe9ce2ca6a7ba8513df4e65f8
Tags
aspackv2 adware persistence stealer
score
7/10

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
7/10

SHA256

0c91706d6fecc4bad18e1e0b527e8bf1ffa13befe9ce2ca6a7ba8513df4e65f8

Threat Level: Shows suspicious behavior

The file ef9ab2023977e956d28040b05d00703c_JaffaCakes118 was found to be: Shows suspicious behavior.

Malicious Activity Summary

aspackv2 adware persistence stealer

ASPack v2.12-2.42

Adds Run key to start application

Installs/modifies Browser Helper Object

Unsigned PE

Modifies registry class

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-14 21:58

Signatures

ASPack v2.12-2.42

aspackv2
Description Indicator Process Target
N/A N/A N/A N/A

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-14 21:58

Reported

2024-04-14 22:01

Platform

win7-20240221-en

Max time kernel

119s

Max time network

129s

Command Line

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll

Signatures

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\{b3e4bcce-59d8-64cc-8c94-f93fc19fe155} = "C:\\Windows\\System32\\Rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll\" DllStart" C:\Windows\SysWOW64\regsvr32.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\{beff04d1-f40e-6766-65bb-ef7c88b0801a} C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{beff04d1-f40e-6766-65bb-ef7c88b0801a}\NoExplorer = "\"\"" C:\Windows\SysWOW64\regsvr32.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{beff04d1-f40e-6766-65bb-ef7c88b0801a} C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{beff04d1-f40e-6766-65bb-ef7c88b0801a}\ = "adsonmedia browser optimizer" C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{beff04d1-f40e-6766-65bb-ef7c88b0801a}\InProcServer32 C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{beff04d1-f40e-6766-65bb-ef7c88b0801a}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{beff04d1-f40e-6766-65bb-ef7c88b0801a}\InProcServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\regsvr32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 2804 wrote to memory of 2732 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe

Processes

C:\Windows\system32\regsvr32.exe

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll

C:\Windows\SysWOW64\regsvr32.exe

/s C:\Users\Admin\AppData\Local\Temp\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll

Network

N/A

Files

memory/2732-0-0x0000000010000000-0x0000000010072000-memory.dmp

memory/2732-1-0x0000000001DB0000-0x0000000001E0A000-memory.dmp

memory/2732-2-0x00000000030A0000-0x00000000030A2000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-14 21:58

Reported

2024-04-14 22:01

Platform

win10v2004-20240412-en

Max time kernel

121s

Max time network

166s

Command Line

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll

Signatures

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\{36b99ea0-d2ab-a2a4-39d4-41049dc00a24} = "C:\\Windows\\System32\\Rundll32.exe \"C:\\Users\\Admin\\AppData\\Local\\Temp\\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll\" DllStart" C:\Windows\SysWOW64\regsvr32.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\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f} C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f}\NoExplorer = "\"\"" C:\Windows\SysWOW64\regsvr32.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f} C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f}\ = "adsonmedia browser optimizer" C:\Windows\SysWOW64\regsvr32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f}\InProcServer32 C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f}\InProcServer32\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll" C:\Windows\SysWOW64\regsvr32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{fcd4eee4-ec1d-1b53-9a6e-2edd34d2547f}\InProcServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\regsvr32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1404 wrote to memory of 1016 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 1404 wrote to memory of 1016 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe
PID 1404 wrote to memory of 1016 N/A C:\Windows\system32\regsvr32.exe C:\Windows\SysWOW64\regsvr32.exe

Processes

C:\Windows\system32\regsvr32.exe

regsvr32 /s C:\Users\Admin\AppData\Local\Temp\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll

C:\Windows\SysWOW64\regsvr32.exe

/s C:\Users\Admin\AppData\Local\Temp\ef9ab2023977e956d28040b05d00703c_JaffaCakes118.dll

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 23.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 24.139.73.23.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 169.117.168.52.in-addr.arpa udp

Files

memory/1016-0-0x0000000010000000-0x0000000010072000-memory.dmp

memory/1016-1-0x00000000015D0000-0x000000000162A000-memory.dmp

memory/1016-2-0x0000000003DE0000-0x0000000003DE2000-memory.dmp

memory/1016-3-0x0000000000FE0000-0x0000000000FE1000-memory.dmp

memory/1016-4-0x0000000000FF0000-0x0000000000FF1000-memory.dmp

memory/1016-5-0x0000000002F50000-0x0000000002F51000-memory.dmp

memory/1016-6-0x0000000003160000-0x0000000003161000-memory.dmp

memory/1016-7-0x0000000003E30000-0x0000000003E31000-memory.dmp

memory/1016-8-0x0000000003210000-0x0000000003211000-memory.dmp

memory/1016-9-0x0000000003E50000-0x0000000003E51000-memory.dmp

memory/1016-10-0x0000000003EC0000-0x0000000003EC1000-memory.dmp

memory/1016-11-0x0000000003EB0000-0x0000000003EB1000-memory.dmp

memory/1016-12-0x0000000003ED0000-0x0000000003ED1000-memory.dmp

memory/1016-13-0x0000000003ED0000-0x0000000003ED1000-memory.dmp