b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f

Analysis

max time kernel
157s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20231020-en
resource tags

arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
submitted
01/11/2023, 19:36

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General

Target

b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe
Size

3.6MB
MD5

16b80e452869df2939d9bd42c77bcc5a
SHA1

f00536b9971e749d94929350713d1dfa39095e53
SHA256

b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f
SHA512

0499ba39765e4e304d9dc30202956e59cab3f5f0b077dd4f79d1a892442295daf3593292090e869988f78cbf57fa41ee321e166a8900c9b5411680a30d821721
SSDEEP

49152:/tRtavkT9tMpBeKWyT3fezuwkkxTqcUC4HTBgi1SN238WFPt0TI6k7vdSZWIXzkB:/tRXB+SKW+vezulo23RcUrqO

Score

7^/10

bootkit persistence

Malware Config

Signatures

Loads dropped DLL 1 IoCs

pid	Process
3908	b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe

Enumerates connected drives 3 TTPs 1 IoCs

Attempts to read the root path of hard drives other than the default C: drive.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	\??\F:	b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

Bootkits write to the MBR to gain persistence at a level below the operating system.

bootkit persistence

Bootkit

T1542.003

description	ioc	Process
File opened for modification	\??\PhysicalDrive0	b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3908	b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe
3908	b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe

C:\Users\Admin\AppData\Local\Temp\b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe
"C:\Users\Admin\AppData\Local\Temp\b3391c4c9d12aa9612e29dd3f3501b47c184d2f8f4c3d4144467c288f0dd099f.exe"
1⤵
- Loads dropped DLL
- Enumerates connected drives
- Writes to the Master Boot Record (MBR)
- Suspicious behavior: EnumeratesProcesses
PID:3908

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Pre-OS Boot

T1542

Bootkit

T1542.003

Privilege Escalation

Defense Evasion

Pre-OS Boot

T1542

Bootkit

T1542.003

Credential Access

Discovery

Peripheral Device Discovery

T1120

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\Tencent\TxGameAssistant\TGBDownloader\dr.dll

Filesize
74KB

MD5
2814acbd607ba47bdbcdf6ac3076ee95

SHA1
50ab892071bed2bb2365ca1d4bf5594e71c6b13b

SHA256
5904a7e4d97eeac939662c3638a0e145f64ff3dd0198f895c4bf0337595c6a67

SHA512
34c73014ffc8d38d6dd29f4f84c8f4f9ea971bc131f665f65b277f453504d5efc2d483a792cdea610c5e0544bf3997b132dcdbe37224912c5234c15cdb89d498

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