Malware Analysis Report

2025-03-15 07:46

Sample ID 240206-ybpclagbal
Target 1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e
SHA256 1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e
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

1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e

Threat Level: Known bad

The file 1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e 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

2024-02-06 19:36

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 19:36

Reported

2024-02-06 19:41

Platform

win7-20231129-en

Max time kernel

120s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe"

Signatures

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.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\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe

"C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.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 ce349766c1a0bb07fecc68b6a158290d
SHA1 43e66324a9f8ba43c076f9e97ad0f089ec4ce30d
SHA256 dc8d43605edaec97d0422642c1a13151ccf1b03293fb06c47b638d4fbecfeb1c
SHA512 efeedcfb6e66f75a4ae8d14752987948377e8eb7e9582831dffa3fc89ab368c752598d1def906176242a82af36424d07a2e8da45b7e2639b35b3d4289eee0110

memory/2388-9-0x0000000000430000-0x000000000043A000-memory.dmp

memory/2388-8-0x0000000000430000-0x000000000043A000-memory.dmp

memory/2388-10-0x0000000000430000-0x000000000043A000-memory.dmp

memory/2388-11-0x0000000000430000-0x000000000043A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-06 19:36

Reported

2024-02-06 19:41

Platform

win10v2004-20231222-en

Max time kernel

92s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe"

Signatures

Enumerates connected drives

Description Indicator Process Target
File opened (read-only) \??\F: C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.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\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe

"C:\Users\Admin\AppData\Local\Temp\1587374fae0c225f4759611b34e6781e9e15fffe560005151e209b9f8d048e5e.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 8.8.8.8:53 master.etl.desktop.qq.com udp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
US 8.8.8.8:53 oth.eve.mdt.qq.com udp
SG 101.33.47.68:8081 oth.eve.mdt.qq.com tcp
US 8.8.8.8:53 74.179.17.96.in-addr.arpa udp
US 8.8.8.8:53 76.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 68.47.33.101.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
CN 157.255.4.39:443 master.etl.desktop.qq.com tcp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.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 67.179.17.96.in-addr.arpa udp
CN 125.39.120.82:443 tcp
US 8.8.8.8:53 50.179.17.96.in-addr.arpa udp

Files

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

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