Analysis Overview
SHA256
19b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55
Threat Level: Known bad
The file Windows Remote Access Trojan.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar RAT
Quasar payload
Executes dropped EXE
Unsigned PE
Creates scheduled task(s)
Suspicious use of SetWindowsHookEx
Uses Task Scheduler COM API
Modifies registry class
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-20 17:51
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
2024-04-20 17:51
Reported
2024-04-20 17:55
Platform
win11-20240412-en
Max time kernel
198s
Max time network
207s
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:\Users\Admin\AppData\Roaming\SubDir\Client.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 |
Modifies registry class
| Description | Indicator | Process | Target |
| Key created | \REGISTRY\USER\S-1-5-21-834482027-582050234-2368284635-1000_Classes\Local Settings | C:\Windows\system32\OpenWith.exe | N/A |
Suspicious use of AdjustPrivilegeToken
| Description | Indicator | Process | Target |
| Token: SeDebugPrivilege | N/A | C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe | N/A |
| Token: SeDebugPrivilege | 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 |
| N/A | N/A | C:\Windows\system32\OpenWith.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4720 wrote to memory of 2844 | N/A | C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4720 wrote to memory of 2844 | N/A | C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4720 wrote to memory of 1148 | N/A | C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 4720 wrote to memory of 1148 | N/A | C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe |
| PID 1148 wrote to memory of 4240 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1148 wrote to memory of 4240 | N/A | C:\Users\Admin\AppData\Roaming\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe
"C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
Network
| Country | Destination | Domain | Proto |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp | |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| GB | 104.86.110.112:443 | tcp | |
| US | 8.8.8.8:53 | 172.210.232.199.in-addr.arpa | udp |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp | |
| N/A | 192.168.1.154:4782 | tcp |
Files
memory/4720-0-0x00000000006C0000-0x00000000009E4000-memory.dmp
memory/4720-1-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp
memory/4720-2-0x000000001B700000-0x000000001B710000-memory.dmp
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
| MD5 | 2c2172ccafa055a00312e4e3a08f229a |
| SHA1 | 1c9dd30693318258d8ffd70984cb348d755c5d97 |
| SHA256 | 19b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55 |
| SHA512 | ceecdee4cdb348a59f7b918b7c1d641e6ac398601493d87e1c91128387664effb457256cec427f71686cda808418003c8dc01ae9b22cb6ce76338237e5213225 |
memory/4720-9-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp
memory/1148-10-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp
memory/1148-11-0x000000001BD60000-0x000000001BD70000-memory.dmp
memory/1148-12-0x000000001C9B0000-0x000000001CA00000-memory.dmp
memory/1148-13-0x000000001CAC0000-0x000000001CB72000-memory.dmp
memory/1148-14-0x00007FFE5F740000-0x00007FFE60202000-memory.dmp
memory/1148-15-0x000000001BD60000-0x000000001BD70000-memory.dmp