Analysis Overview
SHA256
b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar RAT
Quasar family
Quasar payload
Executes dropped EXE
Drops file in Program Files directory
Enumerates physical storage devices
Unsigned PE
Uses Task Scheduler COM API
Suspicious use of WriteProcessMemory
Suspicious use of SendNotifyMessage
Scheduled Task/Job: Scheduled Task
Suspicious use of FindShellTrayWindow
Suspicious use of AdjustPrivilegeToken
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-12-14 09:41
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
2024-12-14 09:41
Reported
2024-12-14 09:42
Platform
win10v2004-20241007-en
Max time kernel
30s
Max time network
31s
Command Line
Signatures
Quasar RAT
Quasar family
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:\Program Files\SubDir\Client.exe | N/A |
Drops file in Program Files directory
| Description | Indicator | Process | Target |
| File created | C:\Program Files\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Program Files\SubDir\Client.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Program Files\SubDir | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Program Files\SubDir\Client.exe | C:\Program Files\SubDir\Client.exe | N/A |
| File opened for modification | C:\Program Files\SubDir | C:\Program Files\SubDir\Client.exe | N/A |
Enumerates physical storage devices
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:\Program Files\SubDir\Client.exe | N/A |
Suspicious use of FindShellTrayWindow
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Program Files\SubDir\Client.exe | N/A |
Suspicious use of SendNotifyMessage
| Description | Indicator | Process | Target |
| N/A | N/A | C:\Program Files\SubDir\Client.exe | N/A |
| N/A | N/A | C:\Program Files\SubDir\Client.exe | N/A |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 4896 wrote to memory of 2276 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4896 wrote to memory of 2276 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 4896 wrote to memory of 3596 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Program Files\SubDir\Client.exe |
| PID 4896 wrote to memory of 3596 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Program Files\SubDir\Client.exe |
| PID 3596 wrote to memory of 2576 | N/A | C:\Program Files\SubDir\Client.exe | C:\Windows\SYSTEM32\schtasks.exe |
| PID 3596 wrote to memory of 2576 | N/A | C:\Program Files\SubDir\Client.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 "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
C:\Program Files\SubDir\Client.exe
"C:\Program Files\SubDir\Client.exe"
C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
Network
| Country | Destination | Domain | Proto |
| US | 8.8.8.8:53 | 133.211.185.52.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 72.32.126.40.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 95.221.229.192.in-addr.arpa | udp |
| US | 8.8.8.8:53 | Waix-40247.portmap.host | udp |
| DE | 193.161.193.99:40247 | Waix-40247.portmap.host | tcp |
| US | 8.8.8.8:53 | 217.106.137.52.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 | 99.193.161.193.in-addr.arpa | udp |
| US | 8.8.8.8:53 | 90.57.201.195.in-addr.arpa | udp |
Files
memory/4896-0-0x00007FFD4F463000-0x00007FFD4F465000-memory.dmp
memory/4896-1-0x00000000003D0000-0x00000000006F4000-memory.dmp
memory/4896-2-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp
C:\Program Files\SubDir\Client.exe
| MD5 | 5d941424d5ea2bcacc9205837acc1dff |
| SHA1 | dad94e588db27fb9afabce3831f2bf4f6ed1e8f2 |
| SHA256 | b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6 |
| SHA512 | f3ef395430ccb27ab7fbac3b8b120aac0d93ac605b09862bfa3085005e9e241e6deee3def80ed7d6c8ae7a1c46c93400ad97f0049e5f79aefb05e65a82d1dab4 |
memory/3596-9-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp
memory/4896-10-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp
memory/3596-11-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp
memory/3596-12-0x000000001C200000-0x000000001C250000-memory.dmp
memory/3596-13-0x000000001C310000-0x000000001C3C2000-memory.dmp
memory/3596-14-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp
memory/3596-17-0x000000001C250000-0x000000001C262000-memory.dmp
memory/3596-18-0x000000001C2B0000-0x000000001C2EC000-memory.dmp