Analysis Overview
SHA256
a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840
Threat Level: Known bad
The file Client-built.exe was found to be: Known bad.
Malicious Activity Summary
Quasar family
Quasar RAT
Quasar payload
Drops file in System32 directory
Unsigned PE
Creates scheduled task(s)
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
MITRE ATT&CK
Enterprise Matrix V15
Analysis: static1
Detonation Overview
Reported
2024-04-18 21:56
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
2024-04-18 21:56
Reported
2024-04-18 21:57
Platform
win7-20240319-en
Max time kernel
32s
Max time network
27s
Command Line
Signatures
Quasar RAT
Quasar payload
| Description | Indicator | Process | Target |
| N/A | N/A | N/A | N/A |
Drops file in System32 directory
| Description | Indicator | Process | Target |
| File created | C:\Windows\system32\SubDir\updale.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
| File opened for modification | C:\Windows\system32\SubDir\updale.exe | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | N/A |
Creates scheduled task(s)
| Description | Indicator | Process | Target |
| 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 |
Suspicious use of WriteProcessMemory
| Description | Indicator | Process | Target |
| PID 340 wrote to memory of 1716 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\schtasks.exe |
| PID 340 wrote to memory of 1716 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.exe | C:\Windows\system32\schtasks.exe |
| PID 340 wrote to memory of 1716 | N/A | C:\Users\Admin\AppData\Local\Temp\Client-built.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 av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f
C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
Network
Files
memory/340-0-0x0000000000860000-0x0000000000B84000-memory.dmp
memory/340-1-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp
memory/340-2-0x0000000000300000-0x0000000000380000-memory.dmp
memory/340-4-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp
memory/340-5-0x0000000000300000-0x0000000000380000-memory.dmp