Analysis
- max time kernel
147s - max time network
163s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
08/01/2024, 16:25
General
- Target Client-built.exe
- Size 3.1MB
- Sample240108-tw8vhsdeaj
- SHA256 065c4ba53ac2d46073f7eebb96c4554451b456eabcb8ce6e9337128136dbc3a1
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.183.131:4782
-
36a36f5a-f169-419f-88b1-97b130a80149
-
encryption_key
BFE6DAA9699210DECB126F5EC8A584F15B1C0EDB
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Quasar Client Startup
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 3 IoCs
- Executes dropped EXE 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SendNotifyMessage 1 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
Client.exe
memory/4768-0-0x00000000008C0000-0x0000000000BE4000-memory.dmp
memory/4768-1-0x00007FFFA4780000-0x00007FFFA5241000-memory.dmp
memory/4768-2-0x0000000002F10000-0x0000000002F20000-memory.dmp
memory/4768-10-0x00007FFFA4780000-0x00007FFFA5241000-memory.dmp
memory/5100-9-0x00007FFFA4780000-0x00007FFFA5241000-memory.dmp
memory/5100-11-0x0000000000E00000-0x0000000000E10000-memory.dmp
memory/5100-12-0x000000001C330000-0x000000001C380000-memory.dmp
memory/5100-13-0x000000001C440000-0x000000001C4F2000-memory.dmp
memory/5100-14-0x00007FFFA4780000-0x00007FFFA5241000-memory.dmp
memory/5100-15-0x0000000000E00000-0x0000000000E10000-memory.dmp