b75ff60aaccd7c025a5a2d27afc266bf23808cf46840a4bc868859f0902e09a8

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
26/03/2024, 15:27

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General

Target

TwistedBrush/tbrush.exe
Size

4.5MB
MD5

62cebc5db83820edd5513b55e7d31d2e
SHA1

304b5ad2fc24c85f925de74ad31451febc8310e8
SHA256

7dd6d8d37b589e7f91adba8c57272ca20cdf22d43c3d8a01d7af37e8e38ad413
SHA512

2447f5ac1c2fff104f2d2c73a6fa698d16a4f01b7201e9e4804f17d08672e558a40638cf02ba4839e7f764c5c97624663c0401f1665c3f13f5ebbc7d31c11e34
SSDEEP

49152:D6EEZtfUDQkkj7Jaopyt1x113f71VElPrUlYJP0DACRPlFzzIRTt6P3tssH3rePP:Kfu4jdao09osG

Score

7^/10

Malware Config

Signatures

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	tbrush.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	tbrush.exe

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}\InProcServer32\ThreadingModel = "Apartment"	tbrush.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}	tbrush.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}\InProcServer32	tbrush.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}\InProcServer32\ = "C:\\Windows\\SysWOW64\\Windows.UI.Immersive.dll"	tbrush.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: 33	3024	tbrush.exe
Token: SeIncBasePriorityPrivilege	3024	tbrush.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3024	tbrush.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1352 wrote to memory of 3024	1352	tbrush.exe	89
PID 1352 wrote to memory of 3024	1352	tbrush.exe	89
PID 1352 wrote to memory of 3024	1352	tbrush.exe	89

C:\Users\Admin\AppData\Local\Temp\TwistedBrush\tbrush.exe
"C:\Users\Admin\AppData\Local\Temp\TwistedBrush\tbrush.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1352
- C:\Users\Admin\AppData\Local\Temp\TwistedBrush\tbrush.exe
  "C:\Users\Admin\AppData\Local\Temp\TwistedBrush\tbrush.exe"
  2⤵
  - Checks BIOS information in registry
  - Modifies registry class
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:3024

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1352-1-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1352-16-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-9-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-8-0x00000000004D0000-0x0000000000526000-memory.dmp

Filesize
344KB

Download
memory/3024-11-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-12-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-13-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-14-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-15-0x00000000004D0000-0x0000000000526000-memory.dmp

Filesize
344KB

Download
memory/3024-3-0x00000000004D0000-0x0000000000526000-memory.dmp

Filesize
344KB

Download
memory/3024-17-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-18-0x00000000004D0000-0x0000000000526000-memory.dmp

Filesize
344KB

Download
memory/3024-19-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/3024-20-0x00000000004D0000-0x0000000000526000-memory.dmp

Filesize
344KB

Download