Analysis Overview
SHA256
7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4
Threat Level: Known bad
The file client-2.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar payload
Quasar RAT
Executes dropped EXE
Drops file in System32 directory
Unsigned PE
Enumerates physical storage devices
Uses Task Scheduler COM API
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Suspicious use of SendNotifyMessage
Suspicious use of FindShellTrayWindow
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2023-12-01 10:30
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
2023-12-01 10:30
Reported
2023-12-01 10:33
Platform
win7-20231023-en
Max time kernel
117s
Max time network
121s
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 |
| 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-2.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\client-2.exe | N/A |
Enumerates physical storage devices
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-2.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | 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
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\client-2.exe
"C:\Users\Admin\AppData\Local\Temp\client-2.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar 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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 127.0.0.1:7777 | tcp |
Files
memory/2696-0-0x0000000001250000-0x0000000001574000-memory.dmp
memory/2696-1-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp
memory/2696-2-0x0000000000260000-0x00000000002E0000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | cac610eeae60d8291a852ad9dda90c81 |
| SHA1 | d97afeabdc465c60ba040becfbc5abde19ec9326 |
| SHA256 | 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4 |
| SHA512 | 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5 |
C:\Windows\system32\SubDir\Client.exe
| MD5 | cac610eeae60d8291a852ad9dda90c81 |
| SHA1 | d97afeabdc465c60ba040becfbc5abde19ec9326 |
| SHA256 | 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4 |
| SHA512 | 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5 |
memory/2728-7-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp
memory/2696-8-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp
memory/2728-9-0x00000000003B0000-0x00000000006D4000-memory.dmp
memory/2728-10-0x000007FEF5380000-0x000007FEF5D6C000-memory.dmp
memory/2728-11-0x000000001B600000-0x000000001B680000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2023-12-01 10:30
Reported
2023-12-01 10:33
Platform
win10v2004-20231127-en
Max time kernel
150s
Max time network
155s
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 |
| 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-2.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\client-2.exe | N/A |
Enumerates physical storage devices
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-2.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | 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 4112 wrote to memory of 3788 | N/A | C:\Users\Admin\AppData\Local\Temp\client-2.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4112 wrote to memory of 3788 | N/A | C:\Users\Admin\AppData\Local\Temp\client-2.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4112 wrote to memory of 2972 | N/A | C:\Users\Admin\AppData\Local\Temp\client-2.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 4112 wrote to memory of 2972 | N/A | C:\Users\Admin\AppData\Local\Temp\client-2.exe | C:\Windows\system32\SubDir\Client.exe |
| PID 2972 wrote to memory of 2152 | N/A | C:\Windows\system32\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 2972 wrote to memory of 2152 | 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-2.exe
"C:\Users\Admin\AppData\Local\Temp\client-2.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar 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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| N/A | 127.0.0.1:7777 | tcp | |
| US | 8.8.8.8:53 | 8.8.8.8.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 8.173.189.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 107.175.53.84.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 14.160.190.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 241.154.82.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 68.159.190.20.in-addr.arpa | udp |
Files
memory/4112-0-0x0000000000D40000-0x0000000001064000-memory.dmp
memory/4112-1-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp
memory/4112-2-0x0000000003450000-0x0000000003460000-memory.dmp
C:\Windows\System32\SubDir\Client.exe
| MD5 | cac610eeae60d8291a852ad9dda90c81 |
| SHA1 | d97afeabdc465c60ba040becfbc5abde19ec9326 |
| SHA256 | 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4 |
| SHA512 | 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5 |
C:\Windows\system32\SubDir\Client.exe
| MD5 | cac610eeae60d8291a852ad9dda90c81 |
| SHA1 | d97afeabdc465c60ba040becfbc5abde19ec9326 |
| SHA256 | 7fbdff8ee9930b76ae1ca9310f493ae700e1f7c9aa1b32c47fca64a240317ed4 |
| SHA512 | 887edd3ac530c3014aea7d8aab97756aabf250c5cecf01c837a19787403ca6dcb0ed1e84a6842af69c4418e14e7bd9327762db228344229df24ff536ae81d2e5 |
memory/2972-8-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp
memory/2972-9-0x000000001B280000-0x000000001B290000-memory.dmp
memory/2972-10-0x000000001D7C0000-0x000000001D810000-memory.dmp
memory/2972-11-0x000000001D8D0000-0x000000001D982000-memory.dmp
memory/4112-12-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp
memory/2972-13-0x00007FFE96070000-0x00007FFE96B31000-memory.dmp
memory/2972-14-0x000000001B280000-0x000000001B290000-memory.dmp