Malware Analysis Report

2025-04-14 04:54

Sample ID 241213-l2s29avlbx
Target cclent.exe
SHA256 a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b
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

a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Suspicious use of AdjustPrivilegeToken

Uses Task Scheduler COM API

Scheduled Task/Job: Scheduled Task

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-13 10:02

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

2024-12-13 10:02

Reported

2024-12-13 10:04

Platform

win7-20240903-en

Max time kernel

148s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\cclent.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\cclent.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

Suspicious use of SetWindowsHookEx

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\cclent.exe

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

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "vchost32" /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 "vchost32" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp

Files

memory/2360-0-0x000007FEF5803000-0x000007FEF5804000-memory.dmp

memory/2360-1-0x0000000001350000-0x0000000001674000-memory.dmp

memory/2360-2-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

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

MD5 94222631ef1071a4f7ceb180cf8a4a5a
SHA1 786d8b2d8b931a9282ee54367d2dda501f1ca946
SHA256 a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b
SHA512 00503983a35e8d0f65eea6a811d7177a389cb1b4d8716d32e50fd5346deb428cd472cbaca7375c56ac3f113ea76db55322993b4d68d816b50a4b27887a2fa14d

memory/1160-8-0x0000000000AB0000-0x0000000000DD4000-memory.dmp

memory/1160-10-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

memory/2360-9-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

memory/1160-11-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

memory/1160-12-0x000007FEF5800000-0x000007FEF61EC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-13 10:02

Reported

2024-12-13 10:04

Platform

win10v2004-20241007-en

Max time kernel

134s

Max time network

144s

Command Line

"C:\Users\Admin\AppData\Local\Temp\cclent.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\cclent.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

Suspicious use of SetWindowsHookEx

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\cclent.exe

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

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "vchost32" /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 "vchost32" /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 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 23.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
NL 91.92.243.191:5401 tcp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
NL 91.92.243.191:5401 tcp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
NL 91.92.243.191:5401 tcp
NL 91.92.243.191:5401 tcp

Files

memory/4684-0-0x00007FFD55DD3000-0x00007FFD55DD5000-memory.dmp

memory/4684-1-0x0000000000530000-0x0000000000854000-memory.dmp

memory/4684-2-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

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

MD5 94222631ef1071a4f7ceb180cf8a4a5a
SHA1 786d8b2d8b931a9282ee54367d2dda501f1ca946
SHA256 a45b373b780f5b9fcf5c51473c69bbf0ed650f300523097602b35f5222bd122b
SHA512 00503983a35e8d0f65eea6a811d7177a389cb1b4d8716d32e50fd5346deb428cd472cbaca7375c56ac3f113ea76db55322993b4d68d816b50a4b27887a2fa14d

memory/3112-9-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

memory/4684-10-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

memory/3112-11-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp

memory/3112-12-0x000000001E050000-0x000000001E0A0000-memory.dmp

memory/3112-13-0x000000001E160000-0x000000001E212000-memory.dmp

memory/3112-14-0x00007FFD55DD0000-0x00007FFD56891000-memory.dmp