Analysis
- max time kernel
144s - max time network
148s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
19/05/2024, 03:49
General
- Target Client-built.exe
- Size 3.1MB
- Sample240519-ede26ahb56
- SHA256 f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa
Malware Config
Extracted
-
quasar
-
1.4.1
-
Office04
-
littlebirdyy-26683.portmap.host:26683
-
91a6c51e-b9c8-459f-82b5-8fd3ea82ad14
-
encryption_key
91837990C32A7683311E3E452264F10B98C1534B
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
Microsoft Service
-
subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 2 IoCs
- Executes dropped EXE 1 IoCs
- Drops file in Program Files directory 5 IoCs
- 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
-
C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Microsoft Service" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
-
-
C:\Program Files\SubDir\Client.exe"C:\Program Files\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Drops file in Program Files 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 "Microsoft Service" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
-
-
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4320,i,13879737908471496610,15335851594401413307,262144 --variations-seed-version --mojo-platform-channel-handle=1416 /prefetch:81⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Client.exe
memory/760-10-0x00007FF842860000-0x00007FF843321000-memory.dmp
memory/760-11-0x00007FF842860000-0x00007FF843321000-memory.dmp
memory/760-12-0x000000001C4C0000-0x000000001C510000-memory.dmp
memory/760-13-0x000000001C5D0000-0x000000001C682000-memory.dmp
memory/760-14-0x00007FF842860000-0x00007FF843321000-memory.dmp
memory/3856-0-0x00007FF842863000-0x00007FF842865000-memory.dmp
memory/3856-1-0x0000000000DC0000-0x00000000010EA000-memory.dmp
memory/3856-2-0x00007FF842860000-0x00007FF843321000-memory.dmp
memory/3856-9-0x00007FF842860000-0x00007FF843321000-memory.dmp