Analysis
- max time kernel
152s - max time network
157s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
22/04/2024, 11:56
General
- Target sclient.exe
- Size 74KB
- Sample240422-n4bbbsbb3v
- SHA256 b79f88a2b7ba116fa4c0a2565d373db22bbbb312be647c352860b015927c6ec8
Malware Config
Extracted
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asyncrat
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Venom RAT + HVNC + Stealer + Grabber v6.0.3
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Default
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drlwrqqffwoynptzb
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delay
1
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install
true
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install_file
system32.exe
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install_folder
%AppData%
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pastebin_config
https://pastebin.com/raw/095APLHG
Signatures
- AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
- Async RAT payload 1 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Legitimate hosting services abused for malware hosting/C2 1 TTPs 46 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 10 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\sclient.exe"C:\Users\Admin\AppData\Local\Temp\sclient.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "system32" /tr '"C:\Users\Admin\AppData\Roaming\system32.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "system32" /tr '"C:\Users\Admin\AppData\Roaming\system32.exe"'3⤵
- Creates scheduled task(s)
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1393.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Roaming\system32.exe"C:\Users\Admin\AppData\Roaming\system32.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
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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 --mojo-platform-channel-handle=4120 --field-trial-handle=2280,i,4114443225282860369,4764091921472631035,262144 --variations-seed-version /prefetch:81⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
tmp1393.tmp.bat
DataLogs.conf
system32.exe
memory/1616-8-0x00007FFD5F250000-0x00007FFD5F445000-memory.dmp
memory/1616-9-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp
memory/1616-10-0x00007FFD5F250000-0x00007FFD5F445000-memory.dmp
memory/1616-0-0x0000000000930000-0x0000000000948000-memory.dmp
memory/1616-3-0x000000001B4E0000-0x000000001B4F0000-memory.dmp
memory/1616-1-0x00007FFD3FDC0000-0x00007FFD40881000-memory.dmp
memory/4204-16-0x00007FFD3FA90000-0x00007FFD40551000-memory.dmp
memory/4204-17-0x000000001AED0000-0x000000001AEE0000-memory.dmp
memory/4204-18-0x00007FFD5F250000-0x00007FFD5F445000-memory.dmp
memory/4204-19-0x00007FFD3FA90000-0x00007FFD40551000-memory.dmp
memory/4204-20-0x000000001AED0000-0x000000001AEE0000-memory.dmp
memory/4204-21-0x00007FFD5F250000-0x00007FFD5F445000-memory.dmp