Malware Analysis Report

2025-01-18 04:07

Sample ID 241104-a1chbsyfrc
Target Fpsunlocker.exe
SHA256 b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f
Tags
office04 quasar spyware trojan
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

b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f

Threat Level: Known bad

The file Fpsunlocker.exe was found to be: Known bad.

Malicious Activity Summary

office04 quasar spyware trojan

Quasar payload

Quasar RAT

Quasar family

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of SendNotifyMessage

Scheduled Task/Job: Scheduled Task

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-04 00:40

Signatures

Quasar family

quasar

Quasar payload

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

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-04 00:40

Reported

2024-11-04 00:43

Platform

win7-20240729-en

Max time kernel

149s

Max time network

138s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

quasar

Quasar payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A
N/A N/A C:\Windows\system32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Fpsunlocker.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 Inversin-43597.portmap.host udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 tcp

Files

memory/1096-0-0x000007FEF57C3000-0x000007FEF57C4000-memory.dmp

memory/1096-1-0x0000000001340000-0x0000000001664000-memory.dmp

memory/1096-2-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

MD5 bf656c2e5e1e942c41fa918132faa7ab
SHA1 1c2ddd815378e54db9e21dd2e61d89067c94da4f
SHA256 b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f
SHA512 54bef34ab722d69f1d3b7f5316f1fbc10fc629bb134f70eecb6a368330b7b73305ef5fa0b9e83c104e6e679ccd1d6e7f5a20caf4f39e6b03d4940b4ed9540b7d

memory/1984-8-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

memory/1984-9-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

memory/1984-7-0x0000000001380000-0x00000000016A4000-memory.dmp

memory/1096-10-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

memory/1984-11-0x000007FEF57C0000-0x000007FEF61AC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-04 00:40

Reported

2024-11-04 00:44

Platform

win10v2004-20241007-en

Max time kernel

138s

Max time network

147s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

quasar

Quasar payload

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

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Fpsunlocker.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Uses Task Scheduler COM API

persistence

Processes

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

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

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 Inversin-43597.portmap.host udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
US 8.8.8.8:53 g.bing.com udp
US 150.171.28.10:443 g.bing.com tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 142.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp

Files

memory/1080-0-0x00007FFC53833000-0x00007FFC53835000-memory.dmp

memory/1080-1-0x0000000000670000-0x0000000000994000-memory.dmp

memory/1080-2-0x00007FFC53830000-0x00007FFC542F1000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

MD5 bf656c2e5e1e942c41fa918132faa7ab
SHA1 1c2ddd815378e54db9e21dd2e61d89067c94da4f
SHA256 b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f
SHA512 54bef34ab722d69f1d3b7f5316f1fbc10fc629bb134f70eecb6a368330b7b73305ef5fa0b9e83c104e6e679ccd1d6e7f5a20caf4f39e6b03d4940b4ed9540b7d

memory/4320-9-0x00007FFC53830000-0x00007FFC542F1000-memory.dmp

memory/1080-8-0x00007FFC53830000-0x00007FFC542F1000-memory.dmp

memory/4320-10-0x00007FFC53830000-0x00007FFC542F1000-memory.dmp

memory/4320-11-0x000000001C5F0000-0x000000001C640000-memory.dmp

memory/4320-12-0x000000001C700000-0x000000001C7B2000-memory.dmp

memory/4320-13-0x00007FFC53830000-0x00007FFC542F1000-memory.dmp