Analysis Overview
SHA256
7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa
Threat Level: Known bad
The file Client-built.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
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Suspicious use of SetWindowsHookEx
Scheduled Task/Job: Scheduled Task
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-08-18 22:09
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
2024-08-18 22:09
Reported
2024-08-18 22:11
Platform
win7-20240705-en
Max time kernel
149s
Max time network
147s
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\Windows\Windows Host Process.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File created | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Scheduled Task/Job: Scheduled Task
| 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-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\Windows\Windows Host Process.exe
"C:\Windows\system32\Windows\Windows Host Process.exe"
C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp | |
| US | 147.185.221.22:10340 | tcp |
Files
memory/1984-0-0x000007FEF6543000-0x000007FEF6544000-memory.dmp
memory/1984-1-0x0000000001280000-0x00000000015E6000-memory.dmp
memory/1984-2-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp
C:\Windows\System32\Windows\Windows Host Process.exe
| MD5 | 58587e08cc617fb97526bfbac57b62e8 |
| SHA1 | bd38f26aa6541b07a510d0a064b5c7235c9c8a5b |
| SHA256 | 7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa |
| SHA512 | b0ecdbe15b1fd4d2e190c285c14d1e454e9192105698f0d89952999a13b2b238128326eaf243e29c13c8d1c1e8372c7b6d735c92374921e2740fdd91d91da525 |
memory/1984-8-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp
memory/1376-11-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp
memory/1376-10-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp
memory/1376-9-0x00000000010D0000-0x0000000001436000-memory.dmp
memory/1376-12-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp
Analysis: behavioral2
Detonation Overview
Submitted
2024-08-18 22:09
Reported
2024-08-18 22:23
Platform
win10v2004-20240802-en
Max time kernel
444s
Max time network
445s
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\Windows\Windows Host Process.exe | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File opened for modification | C:\Windows\system32\Windows | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| File created | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Scheduled Task/Job: Scheduled Task
| 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-built.exe | N/A |
| Token: SeDebugPrivilege | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| Token: SeCreateGlobalPrivilege | N/A | C:\Windows\system32\dwm.exe | N/A |
| Token: SeChangeNotifyPrivilege | N/A | C:\Windows\system32\dwm.exe | N/A |
| Token: 33 | N/A | C:\Windows\system32\dwm.exe | N/A |
| Token: SeIncBasePriorityPrivilege | N/A | C:\Windows\system32\dwm.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of SetWindowsHookEx
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 1740 wrote to memory of 3588 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1740 wrote to memory of 3588 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 1740 wrote to memory of 5052 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\Windows\Windows Host Process.exe |
| PID 1740 wrote to memory of 5052 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\Windows\Windows Host Process.exe |
| PID 5052 wrote to memory of 4132 | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 5052 wrote to memory of 4132 | N/A | C:\Windows\system32\Windows\Windows Host Process.exe | C:\Windows\SYSTEM32\schtasks.exe |
Uses Task Scheduler COM API
Processes
C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\Windows\Windows Host Process.exe
"C:\Windows\system32\Windows\Windows Host Process.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
C:\Windows\system32\dwm.exe
"dwm.exe"
C:\Windows\system32\sihost.exe
sihost.exe
C:\Windows\system32\sihost.exe
sihost.exe
C:\Windows\system32\dwm.exe
"dwm.exe"
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 28.118.140.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 25.140.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 134.32.126.40.in-addr.arpa | udp |
| US | 147.185.221.22:10340 | tcp | |
| US | 8.8.8.8:53 | 22.221.185.147.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 88.156.103.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | ipwho.is | udp |
| DE | 195.201.57.90:443 | ipwho.is | tcp |
| US | 8.8.8.8:53 | 90.57.201.195.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 13.86.106.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 232.168.11.51.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 103.169.127.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 198.187.3.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 217.135.221.88.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.143.123.92.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 240.221.184.93.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 26.35.223.20.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 11.227.111.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 28.73.42.20.in-addr.arpa | udp |
Files
memory/1740-0-0x00007FFDDF7D3000-0x00007FFDDF7D5000-memory.dmp
memory/1740-1-0x0000000000170000-0x00000000004D6000-memory.dmp
memory/1740-2-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp
C:\Windows\System32\Windows\Windows Host Process.exe
| MD5 | 58587e08cc617fb97526bfbac57b62e8 |
| SHA1 | bd38f26aa6541b07a510d0a064b5c7235c9c8a5b |
| SHA256 | 7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa |
| SHA512 | b0ecdbe15b1fd4d2e190c285c14d1e454e9192105698f0d89952999a13b2b238128326eaf243e29c13c8d1c1e8372c7b6d735c92374921e2740fdd91d91da525 |
memory/5052-9-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp
memory/1740-10-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp
memory/5052-11-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp
memory/5052-12-0x000000001C2F0000-0x000000001C340000-memory.dmp
memory/5052-13-0x000000001C400000-0x000000001C4B2000-memory.dmp
memory/5052-16-0x000000001C340000-0x000000001C352000-memory.dmp
memory/5052-17-0x000000001C3A0000-0x000000001C3DC000-memory.dmp
memory/5052-18-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp
memory/5052-19-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp
memory/5052-21-0x00007FFDDF7D0000-0x00007FFDE0291000-memory.dmp