Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
25/03/2024, 17:10
General
- Target Client-built.exe
- Size 3.1MB
- Sample240325-vp29tsge71
- SHA256 32af4fc5c3378eebefe2097f13c727cc76ef69cc3a72ee80441660ece414dbd7
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
76.104.23.114:4782
-
68e45ba9-7e21-4f0d-931a-cedfb3768955
-
encryption_key
A50E2BA4794226E7D5971DAC3C0FDE6E752B0E33
-
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 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
-
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
-
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 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
Loading Replay Monitor...
Downloads
Client.exe
Client.exe
memory/3808-10-0x00007FFE8CE20000-0x00007FFE8D8E1000-memory.dmp
memory/3808-11-0x000000001B240000-0x000000001B250000-memory.dmp
memory/3808-12-0x000000001BD00000-0x000000001BD50000-memory.dmp
memory/3808-13-0x000000001BE10000-0x000000001BEC2000-memory.dmp
memory/3808-14-0x00007FFE8CE20000-0x00007FFE8D8E1000-memory.dmp
memory/4016-0-0x0000000000F80000-0x00000000012A4000-memory.dmp
memory/4016-1-0x00007FFE8CE20000-0x00007FFE8D8E1000-memory.dmp
memory/4016-2-0x0000000003430000-0x0000000003440000-memory.dmp
memory/4016-9-0x00007FFE8CE20000-0x00007FFE8D8E1000-memory.dmp