b75ff60aaccd7c025a5a2d27afc266bf23808cf46840a4bc868859f0902e09a8

Analysis

max time kernel
140s
max time network
125s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-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

upx

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

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral25/memory/1204-23-0x0000000004E40000-0x0000000005052000-memory.dmp	upx
behavioral25/memory/1204-40-0x0000000004E40000-0x0000000005052000-memory.dmp	upx

Modifies registry class 4 IoCs

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}\ = "UIHost Class"	tbrush.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}\AppID = "{36938566-B1AA-4E77-9B3F-730CF4E996AB}"	tbrush.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}\Programmable	tbrush.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{5F758A17-C5A7-42F4-D83A-BC4176A94429}	tbrush.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1204	tbrush.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: 33	1204	tbrush.exe
Token: SeIncBasePriorityPrivilege	1204	tbrush.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1204	tbrush.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2360 wrote to memory of 1204	2360	tbrush.exe	28
PID 2360 wrote to memory of 1204	2360	tbrush.exe	28
PID 2360 wrote to memory of 1204	2360	tbrush.exe	28
PID 2360 wrote to memory of 1204	2360	tbrush.exe	28

C:\Users\Admin\AppData\Local\Temp\TwistedBrush\tbrush.exe
"C:\Users\Admin\AppData\Local\Temp\TwistedBrush\tbrush.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2360
- 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 behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:1204

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

C:\Users\Admin\AppData\Local\Temp\TwistedBrush\log.txt

Filesize
1KB

MD5
1269ed3f877da04f64e4d2fd49c7030e

SHA1
4536a58b0270fff09d9111e8e5fde5a2605faccc

SHA256
f0251275bac1cd54748e20923d73e4d7a17d91d77ed11c8fee354809dc384cda

SHA512
2912386c76bcf47a6c343995f874ea85ef2fd3ddb6e8ac1d8a4670822329aee3ac2847753c8e0bf2d181d7f167a36d3f8b90a973823612278c99d9a465eb6cee

Download Submit
C:\Users\Admin\AppData\Local\Temp\TwistedBrush\log.txt

Filesize
721B

MD5
988541e5fdd3123d673aaf723b3a5fb9

SHA1
0aa6a642ec66a1e6b1d850222236abeda286b6af

SHA256
b332f4221f244d515aba3260513e24864a31585edf473d40d0cda1e6aa5cb1d6

SHA512
cfff5dac7d5eef365f9d541cf5d7cdfeeffdf85bf335d27050fbe14ebae68c98c0dd42efa19843d43f1119e6e0d642628a36048b213d7936604b6cd9a06eb172

Download Submit
memory/1204-145-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-39-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-40-0x0000000004E40000-0x0000000005052000-memory.dmp

Filesize
2.1MB

Download
memory/1204-9-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-11-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-12-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-13-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-14-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-15-0x00000000002C0000-0x0000000000316000-memory.dmp

Filesize
344KB

Download
memory/1204-175-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-17-0x0000000004C70000-0x0000000004C7C000-memory.dmp

Filesize
48KB

Download
memory/1204-18-0x0000000003590000-0x0000000003701000-memory.dmp

Filesize
1.4MB

Download
memory/1204-19-0x0000000004D90000-0x0000000004E24000-memory.dmp

Filesize
592KB

Download
memory/1204-20-0x0000000004E30000-0x0000000004E40000-memory.dmp

Filesize
64KB

Download
memory/1204-21-0x0000000005060000-0x000000000524B000-memory.dmp

Filesize
1.9MB

Download
memory/1204-23-0x0000000004E40000-0x0000000005052000-memory.dmp

Filesize
2.1MB

Download
memory/1204-24-0x00000000052A0000-0x0000000005306000-memory.dmp

Filesize
408KB

Download
memory/1204-27-0x0000000005430000-0x000000000556D000-memory.dmp

Filesize
1.2MB

Download
memory/1204-26-0x0000000005310000-0x0000000005425000-memory.dmp

Filesize
1.1MB

Download
memory/1204-29-0x00000000002C0000-0x0000000000316000-memory.dmp

Filesize
344KB

Download
memory/1204-6-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-30-0x00000000032B0000-0x0000000003328000-memory.dmp

Filesize
480KB

Download
memory/1204-8-0x00000000002C0000-0x0000000000316000-memory.dmp

Filesize
344KB

Download
memory/1204-41-0x00000000032B0000-0x0000000003328000-memory.dmp

Filesize
480KB

Download
memory/1204-42-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-172-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-169-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-137-0x00000000002C0000-0x0000000000316000-memory.dmp

Filesize
344KB

Download
memory/1204-138-0x0000000003590000-0x0000000003701000-memory.dmp

Filesize
1.4MB

Download
memory/1204-139-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-142-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-0-0x00000000002C0000-0x0000000000316000-memory.dmp

Filesize
344KB

Download
memory/1204-148-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-151-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-154-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-157-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-160-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-163-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/1204-166-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/2360-1-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download
memory/2360-4-0x0000000001DB0000-0x000000000267D000-memory.dmp

Filesize
8.8MB

Download
memory/2360-16-0x0000000010000000-0x00000000108CD000-memory.dmp

Filesize
8.8MB

Download