Malware Analysis Report

2024-10-19 10:47

Sample ID 240620-hyxz9avgle
Target 03e873af115a685837d203aa436c0478_JaffaCakes118
SHA256 67ff69794254f402a1c21e976394715801b90c71fdd1c72651e866c19f7a159d
Tags
adware stealer persistence privilege_escalation
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

67ff69794254f402a1c21e976394715801b90c71fdd1c72651e866c19f7a159d

Threat Level: Likely malicious

The file 03e873af115a685837d203aa436c0478_JaffaCakes118 was found to be: Likely malicious.

Malicious Activity Summary

adware stealer persistence privilege_escalation

Event Triggered Execution: AppInit DLLs

Installs/modifies Browser Helper Object

Drops file in System32 directory

Unsigned PE

Modifies registry class

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-20 07:09

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-20 07:09

Reported

2024-06-20 07:11

Platform

win7-20240611-en

Max time kernel

150s

Max time network

120s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\03e873af115a685837d203aa436c0478_JaffaCakes118.dll,#1

Signatures

Installs/modifies Browser Helper Object

stealer adware
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{37AC9076-C898-B098-D098-A18319080973} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer\Browser Helper Objects\{37AC9076-C898-B098-D098-A18319080973}\ = "nhmxcjkl.dll" C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\verclsid.exe C:\Windows\SysWOW64\rundll32.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973}\InprocServer32\ = "C:\\Windows\\SysWow64\\nhmxcjkl.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\rundll32.exe N/A

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\03e873af115a685837d203aa436c0478_JaffaCakes118.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\03e873af115a685837d203aa436c0478_JaffaCakes118.dll,#1

C:\Windows\SysWOW64\cmd.exe

cmd /c C:\Users\Admin\AppData\Local\Temp\~DFD259394968.bat

Network

N/A

Files

C:\Users\Admin\AppData\Local\Temp\~DFD259394968.bat

MD5 09517fc62284f33e877a276463580bd1
SHA1 0b14fe1db4493818f9de0bf2a56ee5370b8d479a
SHA256 6cc6bbb1f3f754b6894d84130f5f2d86569ac3a603e1632d3cefa028f22b6238
SHA512 1b924dd216d0f38199cc6df215e65ff260aa48fa37aa620dabcbc616f434643bd1f2e617d66b14bd52900214148741565128ba9589782ba582fd7308369f4a4d

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-20 07:09

Reported

2024-06-20 07:11

Platform

win10v2004-20240611-en

Max time kernel

150s

Max time network

128s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\03e873af115a685837d203aa436c0478_JaffaCakes118.dll,#1

Signatures

Event Triggered Execution: AppInit DLLs

persistence privilege_escalation

Installs/modifies Browser Helper Object

stealer adware
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{37AC9076-C898-B098-D098-A18319080973} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{37AC9076-C898-B098-D098-A18319080973}\ = "nhmxcjkl.dll" C:\Windows\SysWOW64\rundll32.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\verclsid.exe C:\Windows\SysWOW64\rundll32.exe N/A

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973}\InprocServer32 C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID C:\Windows\SysWOW64\rundll32.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973} C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973}\InprocServer32\ = "C:\\Windows\\SysWow64\\nhmxcjkl.dll" C:\Windows\SysWOW64\rundll32.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{37AC9076-C898-B098-D098-A18319080973}\InprocServer32\ThreadingModel = "Apartment" C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A
N/A N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3532 wrote to memory of 2436 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3532 wrote to memory of 2436 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3532 wrote to memory of 2436 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2436 wrote to memory of 1128 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\cmd.exe
PID 2436 wrote to memory of 1128 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\cmd.exe
PID 2436 wrote to memory of 1128 N/A C:\Windows\SysWOW64\rundll32.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\03e873af115a685837d203aa436c0478_JaffaCakes118.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\03e873af115a685837d203aa436c0478_JaffaCakes118.dll,#1

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c C:\Users\Admin\AppData\Local\Temp\~DFD240597406.bat

Network

Country Destination Domain Proto
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 17.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
NL 23.62.61.129:443 www.bing.com tcp
US 8.8.8.8:53 129.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Temp\~DFD240597406.bat

MD5 09517fc62284f33e877a276463580bd1
SHA1 0b14fe1db4493818f9de0bf2a56ee5370b8d479a
SHA256 6cc6bbb1f3f754b6894d84130f5f2d86569ac3a603e1632d3cefa028f22b6238
SHA512 1b924dd216d0f38199cc6df215e65ff260aa48fa37aa620dabcbc616f434643bd1f2e617d66b14bd52900214148741565128ba9589782ba582fd7308369f4a4d