Analysis Overview
SHA256
33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7
Threat Level: Known bad
The file Client-builttttt.exe was found to be: Known bad.
Malicious Activity Summary
Quasar payload
Quasar RAT
Quasar family
Executes dropped EXE
Drops file in System32 directory
Unsigned PE
Suspicious use of WriteProcessMemory
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Uses Task Scheduler COM API
Creates scheduled task(s)
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-19 22:35
Signatures
Quasar family
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
2024-04-19 22:35
Reported
2024-04-19 22:36
Platform
win11-20240412-en
Max time kernel
27s
Max time network
20s
Command Line
Signatures
Quasar RAT
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:\Windows\system32\SubDir\Client.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe | N/A |
Creates scheduled task(s)
| 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\Client-builttttt.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1440 wrote to memory of 5012 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1440 wrote to memory of 5012 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1440 wrote to memory of 4960 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 1440 wrote to memory of 4960 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 4960 wrote to memory of 1604 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4960 wrote to memory of 1604 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe
"C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\system32\SubDir\Client.exe
"C:\Windows\system32\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.1.139:4782 | tcp | |
| N/A | 127.0.0.1:4782 | tcp |
Files
memory/1440-0-0x0000000000060000-0x0000000000384000-memory.dmp
memory/1440-1-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp
memory/1440-2-0x000000001B110000-0x000000001B120000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | 6008b1f40ce25519bacd9a12f89755df |
| SHA1 | e38e22911d1baebae439caf4d5556143927e3a02 |
| SHA256 | 33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7 |
| SHA512 | 133aea39eb9617aa968c33add336304a1b1796ba1945db7ad7b6748d3463e77dbb405ff3755f4dc1f6d3de37eec870d9b01c3dcbaa0ff399f02e86174ec5a2ce |
memory/1440-9-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp
memory/4960-8-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp
memory/4960-10-0x000000001BBB0000-0x000000001BBC0000-memory.dmp
memory/4960-11-0x000000001C740000-0x000000001C790000-memory.dmp
memory/4960-12-0x000000001C850000-0x000000001C902000-memory.dmp
memory/4960-13-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp
memory/4960-14-0x000000001BBB0000-0x000000001BBC0000-memory.dmp