Malware Analysis Report

2025-03-15 07:45

Sample ID 240223-w7m4asfg5t
Target 1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2
SHA256 1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2
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

1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2

Threat Level: Known bad

The file 1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2 was found to be: Known bad.

Malicious Activity Summary

isfb gozi bootkit persistence

Gozi family

Loads dropped DLL

Enumerates connected drives

Writes to the Master Boot Record (MBR)

Unsigned PE

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-02-23 18:33

Signatures

Gozi family

gozi

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-23 18:33

Reported

2024-02-23 18:36

Platform

win7-20240221-en

Max time kernel

120s

Max time network

126s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe"

Signatures

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.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\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe

"C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.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/1556-4-0x0000000000120000-0x000000000012A000-memory.dmp

memory/1556-5-0x0000000000120000-0x000000000012A000-memory.dmp

memory/1556-11-0x0000000000120000-0x000000000012A000-memory.dmp

memory/1556-10-0x0000000000120000-0x000000000012A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-23 18:33

Reported

2024-02-23 18:36

Platform

win10v2004-20240221-en

Max time kernel

93s

Max time network

114s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe"

Signatures

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.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\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.exe

"C:\Users\Admin\AppData\Local\Temp\1b62bebbf3151197d8124e6e2f9a8802ccc761c3836316438a0466890b9fe6d2.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
US 8.8.8.8:53 82.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 175.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 206.47.33.101.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
CN 113.105.95.120:443 tcp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
CN 125.39.120.82:443 tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp

Files

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

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