Analysis
- max time kernel
36s - max time network
44s - platform
windows10-2004_x64 - resource
win10v2004-20240319-en - resource tags
- submitted
28/03/2024, 18:06
General
- Target Fix.exe
- Size 3.1MB
- Sample240328-wpq28sdd97
- SHA256 fc49b4827d7ad34dece937cd01a3ad2efb1d963f516b6e87d2f4ffdf1b095894
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
140.238.91.110:42425
-
276d9dc6-b19c-4958-8ac3-89586bd3b515
-
encryption_key
ABCF70C37D1A79A01712038122D1532DF20DF72A
-
install_name
Client.exe
-
log_directory
Error Logs
-
reconnect_delay
3000
-
startup_key
WOS64
-
subdirectory
Windows
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 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 3 IoCs
- Suspicious use of SendNotifyMessage 3 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\Fix.exe"C:\Users\Admin\AppData\Local\Temp\Fix.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "WOS64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Users\Admin\AppData\Roaming\Windows\Client.exe"C:\Users\Admin\AppData\Roaming\Windows\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 "WOS64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Client.exe
memory/3304-11-0x000000001B750000-0x000000001B760000-memory.dmp
memory/3304-10-0x00007FFAD9A00000-0x00007FFADA4C1000-memory.dmp
memory/3304-12-0x000000001C890000-0x000000001C8E0000-memory.dmp
memory/3304-13-0x000000001C9A0000-0x000000001CA52000-memory.dmp
memory/3304-16-0x000000001C920000-0x000000001C932000-memory.dmp
memory/3304-17-0x000000001D0A0000-0x000000001D0DC000-memory.dmp
memory/3304-18-0x00007FFAD9A00000-0x00007FFADA4C1000-memory.dmp
memory/3304-19-0x000000001B750000-0x000000001B760000-memory.dmp
memory/4084-2-0x000000001B5A0000-0x000000001B5B0000-memory.dmp
memory/4084-1-0x00007FFAD9A00000-0x00007FFADA4C1000-memory.dmp
memory/4084-9-0x00007FFAD9A00000-0x00007FFADA4C1000-memory.dmp
memory/4084-0-0x0000000000580000-0x00000000008A4000-memory.dmp