Analysis
- max time kernel
147s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
25/04/2023, 03:32
General
- Target KaSr_uni.exe
- Size 63KB
- Sample230425-d3x4lagb98
- SHA256 9bc6f7078b4a80e7363336194ffccb04d646da487bb093775b3caefd224f7d87
Malware Config
Extracted
-
asyncrat
-
1.1.0
-
Default
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31.192.236.139:3434
-
KalaChowaMutex_alladin
-
delay
1
-
install
true
-
install_file
WinService.exe
-
install_folder
%AppData%
Signatures
- AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
- Async RAT payload 3 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- 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 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 23 IoCs
- Suspicious use of AdjustPrivilegeToken 2 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
-
C:\Users\Admin\AppData\Local\Temp\KaSr_uni.exe"C:\Users\Admin\AppData\Local\Temp\KaSr_uni.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 "WinService" /tr '"C:\Users\Admin\AppData\Roaming\WinService.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "WinService" /tr '"C:\Users\Admin\AppData\Roaming\WinService.exe"'3⤵
- Creates scheduled task(s)
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-
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7218.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\WinService.exe"C:\Users\Admin\AppData\Roaming\WinService.exe"3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
tmp7218.tmp.bat
WinService.exe
WinService.exe
memory/1340-133-0x0000000000A10000-0x0000000000A26000-memory.dmp
memory/1340-134-0x000000001CCD0000-0x000000001CCE0000-memory.dmp
memory/1340-139-0x000000001CAB0000-0x000000001CBFE000-memory.dmp
memory/1580-144-0x000000001C2C0000-0x000000001C2D0000-memory.dmp
memory/1580-145-0x000000001C2C0000-0x000000001C2D0000-memory.dmp