Malware Analysis Report

2025-03-15 07:46

Sample ID 240206-x9l5fsgaan
Target a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2
SHA256 a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2
Tags
isfb gozi bootkit persistence
score
10/10

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
10/10

SHA256

a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2

Threat Level: Known bad

The file a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2 was found to be: Known bad.

Malicious Activity Summary

isfb gozi bootkit persistence

Gozi family

Loads dropped DLL

Writes to the Master Boot Record (MBR)

Enumerates connected drives

Unsigned PE

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-02-06 19:33

Signatures

Gozi family

gozi

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-06 19:33

Reported

2024-02-06 19:36

Platform

win7-20231215-en

Max time kernel

119s

Max time network

120s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe"

Signatures

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe

"C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 master.etl.desktop.qq.com udp
US 8.8.8.8:53 oth.eve.mdt.qq.com udp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
SG 101.33.47.206:8081 oth.eve.mdt.qq.com tcp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
CN 113.105.95.120:443 tcp
CN 125.39.120.82:443 tcp

Files

\Users\Admin\AppData\Local\Tencent\TxGameAssistant\TGBDownloader\dr.dll

MD5 2814acbd607ba47bdbcdf6ac3076ee95
SHA1 50ab892071bed2bb2365ca1d4bf5594e71c6b13b
SHA256 5904a7e4d97eeac939662c3638a0e145f64ff3dd0198f895c4bf0337595c6a67
SHA512 34c73014ffc8d38d6dd29f4f84c8f4f9ea971bc131f665f65b277f453504d5efc2d483a792cdea610c5e0544bf3997b132dcdbe37224912c5234c15cdb89d498

memory/1992-4-0x0000000000160000-0x000000000016A000-memory.dmp

memory/1992-5-0x0000000000160000-0x000000000016A000-memory.dmp

memory/1992-10-0x0000000000160000-0x000000000016A000-memory.dmp

memory/1992-11-0x0000000000160000-0x000000000016A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-06 19:33

Reported

2024-02-06 19:36

Platform

win10v2004-20231222-en

Max time kernel

88s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe"

Signatures

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe N/A

Writes to the Master Boot Record (MBR)

bootkit persistence
Description Indicator Process Target
File opened for modification \??\PhysicalDrive0 C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe

"C:\Users\Admin\AppData\Local\Temp\a54ae659b32861da942b476bd044f68a940d6bd6a1c5a0b3317e76e02835afd2.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 master.etl.desktop.qq.com udp
US 8.8.8.8:53 oth.eve.mdt.qq.com udp
SG 101.33.47.206:8081 oth.eve.mdt.qq.com tcp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
US 8.8.8.8:53 206.47.33.101.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 64.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 79.121.231.20.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 28.160.77.104.in-addr.arpa udp
CN 113.105.95.120:443 tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
CN 125.39.120.82:443 tcp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp

Files

C:\Users\Admin\AppData\Local\Tencent\TxGameAssistant\TGBDownloader\dr.dll

MD5 2814acbd607ba47bdbcdf6ac3076ee95
SHA1 50ab892071bed2bb2365ca1d4bf5594e71c6b13b
SHA256 5904a7e4d97eeac939662c3638a0e145f64ff3dd0198f895c4bf0337595c6a67
SHA512 34c73014ffc8d38d6dd29f4f84c8f4f9ea971bc131f665f65b277f453504d5efc2d483a792cdea610c5e0544bf3997b132dcdbe37224912c5234c15cdb89d498