Malware Analysis Report

2025-01-18 04:18

Sample ID 240106-b7qtzaedck
Target acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c
SHA256 acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c
Tags
quasar office04 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

acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c

Threat Level: Known bad

The file acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c was found to be: Known bad.

Malicious Activity Summary

quasar office04 spyware trojan

Quasar RAT

Quasar payload

Executes dropped EXE

Checks computer location settings

Loads dropped DLL

Enumerates physical storage devices

Unsigned PE

Suspicious use of SetWindowsHookEx

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of FindShellTrayWindow

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-01-06 01:47

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-06 01:47

Reported

2024-01-06 01:50

Platform

win7-20231129-en

Max time kernel

147s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe"

Signatures

Quasar RAT

trojan spyware 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\Local\Temp\RarSFX0\System.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\System.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
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\RarSFX0\System.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\System.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\DllHost.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1840 wrote to memory of 2120 N/A C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe
PID 1840 wrote to memory of 2120 N/A C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe
PID 1840 wrote to memory of 2120 N/A C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe
PID 1840 wrote to memory of 2120 N/A C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe
PID 2120 wrote to memory of 2124 N/A C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe C:\Windows\system32\schtasks.exe
PID 2120 wrote to memory of 2124 N/A C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe C:\Windows\system32\schtasks.exe
PID 2120 wrote to memory of 2124 N/A C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe C:\Windows\system32\schtasks.exe
PID 2120 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe C:\Users\Admin\AppData\Roaming\SubDir\System.exe
PID 2120 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe C:\Users\Admin\AppData\Roaming\SubDir\System.exe
PID 2120 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe C:\Users\Admin\AppData\Roaming\SubDir\System.exe
PID 2492 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Roaming\SubDir\System.exe C:\Windows\system32\schtasks.exe
PID 2492 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Roaming\SubDir\System.exe C:\Windows\system32\schtasks.exe
PID 2492 wrote to memory of 2468 N/A C:\Users\Admin\AppData\Roaming\SubDir\System.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe

"C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe"

C:\Windows\SysWOW64\DllHost.exe

C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}

C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe

"C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe"

C:\Windows\system32\schtasks.exe

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

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

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

C:\Windows\system32\schtasks.exe

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

Network

Country Destination Domain Proto
N/A 10.0.0.245:4782 tcp
N/A 192.168.56.1:4782 tcp
CA 99.247.192.130:4782 tcp
N/A 10.0.0.245:4782 tcp
N/A 192.168.56.1:4782 tcp
CA 99.247.192.130:4782 tcp
N/A 10.0.0.245:4782 tcp
N/A 192.168.56.1:4782 tcp
CA 99.247.192.130:4782 tcp

Files

memory/2120-20-0x00000000008A0000-0x0000000000BC4000-memory.dmp

memory/2120-21-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

memory/2120-23-0x000000001AFF0000-0x000000001B070000-memory.dmp

memory/2148-7-0x0000000000920000-0x0000000000921000-memory.dmp

memory/2148-5-0x0000000000090000-0x0000000000092000-memory.dmp

memory/1840-4-0x0000000002440000-0x0000000002442000-memory.dmp

memory/2120-30-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

memory/2492-31-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

memory/2492-32-0x000000001AFE0000-0x000000001B060000-memory.dmp

memory/2492-29-0x0000000000AC0000-0x0000000000DE4000-memory.dmp

memory/2148-33-0x0000000000920000-0x0000000000921000-memory.dmp

memory/2492-34-0x000007FEF5120000-0x000007FEF5B0C000-memory.dmp

memory/2492-35-0x000000001AFE0000-0x000000001B060000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-06 01:47

Reported

2024-01-06 01:50

Platform

win10v2004-20231215-en

Max time kernel

7s

Max time network

128s

Command Line

"C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3791175113-1062217823-1177695025-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
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

Processes

C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe

"C:\Users\Admin\AppData\Local\Temp\acd6a1d56e317e7b5a69567f37eb669a7f7f34afcd37d6e42f14f52e970c6c4c.exe"

C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe

"C:\Users\Admin\AppData\Local\Temp\RarSFX0\System.exe"

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 0.204.248.87.in-addr.arpa udp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 1.181.190.20.in-addr.arpa udp
US 138.91.171.81:80 tcp
N/A 10.0.0.245:4782 tcp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
N/A 192.168.56.1:4782 tcp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 119.110.54.20.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 176.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 211.135.221.88.in-addr.arpa udp
CA 99.247.192.130:4782 tcp
US 8.8.8.8:53 174.178.17.96.in-addr.arpa udp
N/A 10.0.0.245:4782 tcp
US 20.231.121.79:80 tcp
CA 99.247.192.130:4782 tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 32.134.221.88.in-addr.arpa udp

Files

memory/2948-14-0x0000000000ED0000-0x00000000011F4000-memory.dmp

memory/2948-16-0x000000001BE40000-0x000000001BE50000-memory.dmp

memory/2948-15-0x00007FFD86810000-0x00007FFD872D1000-memory.dmp

memory/2948-24-0x00007FFD86810000-0x00007FFD872D1000-memory.dmp

memory/1148-25-0x00007FFD86810000-0x00007FFD872D1000-memory.dmp

memory/1148-26-0x000000001B550000-0x000000001B560000-memory.dmp

memory/1148-28-0x000000001BC60000-0x000000001BD12000-memory.dmp

memory/1148-27-0x000000001BB50000-0x000000001BBA0000-memory.dmp

memory/1148-29-0x00007FFD86810000-0x00007FFD872D1000-memory.dmp

memory/1148-30-0x000000001B550000-0x000000001B560000-memory.dmp