Analysis
- max time kernel
35s - max time network
36s - platform
windows10-2004_x64 - resource
win10v2004-20240802-en - resource tags
- submitted
24/08/2024, 21:46
General
- Target Client-built.exe
- Size 3.1MB
- Sample240824-1mr9qs1fkf
- SHA256 62ba28de283c1a55c661e50f1a00ee32d6e8d698c902e76502d4dd35f0619199
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
192.168.42.120:4782
-
b0cb9350-994a-47b5-8b24-177175f2d8a2
-
encryption_key
99A9E29AF4C17D170114202006F56B24FDE0F705
-
install_name
NovaFn.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Windows Assistant
-
subdirectory
MandatoryUtils
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in System32 directory 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 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
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Windows Assistant" /sc ONLOGON /tr "C:\Windows\system32\MandatoryUtils\NovaFn.exe" /rl HIGHEST /f2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Windows\system32\MandatoryUtils\NovaFn.exe"C:\Windows\system32\MandatoryUtils\NovaFn.exe"2⤵
- Executes dropped EXE
- Drops file in System32 directory
- 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 "Windows Assistant" /sc ONLOGON /tr "C:\Windows\system32\MandatoryUtils\NovaFn.exe" /rl HIGHEST /f3⤵
- Scheduled Task/Job: Scheduled Task
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
NovaFn.exe
memory/1052-0-0x00007FF9CAE13000-0x00007FF9CAE15000-memory.dmp
memory/1052-1-0x0000000000120000-0x0000000000444000-memory.dmp
memory/1052-2-0x00007FF9CAE10000-0x00007FF9CB8D1000-memory.dmp
memory/1052-9-0x00007FF9CAE10000-0x00007FF9CB8D1000-memory.dmp
memory/3272-10-0x00007FF9CAE10000-0x00007FF9CB8D1000-memory.dmp
memory/3272-11-0x00007FF9CAE10000-0x00007FF9CB8D1000-memory.dmp
memory/3272-12-0x000000001C8E0000-0x000000001C930000-memory.dmp
memory/3272-13-0x000000001C9F0000-0x000000001CAA2000-memory.dmp
memory/3272-14-0x00007FF9CAE10000-0x00007FF9CB8D1000-memory.dmp
memory/3272-15-0x000000001D0E0000-0x000000001D608000-memory.dmp