Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
22/03/2024, 13:21
General
- Target ferUjasO2.exe
- Size 1.3MB
- Sample240322-qlnvtaeb6z
- SHA256 705a49fea31717ee3b3f6ab417011caf2e30a5993331698fbdc18f20a342b9c5
Malware Config
Extracted
-
asyncrat
-
Default
-
1K弗JץץAd2rwFaתNDh比P2
-
delay
1
-
install
true
-
install_file
svchost.exe
-
install_folder
%AppData%
-
pastebin_config
https://pastebin.com/raw/z5PQ82wE
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 3 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 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\ferUjasO2.exe"C:\Users\Admin\AppData\Local\Temp\ferUjasO2.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'3⤵
- Creates scheduled task(s)
-
-
-
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3F1C.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
-
-
C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
tmp3F1C.tmp.bat
svchost.exe
memory/3552-15-0x00007FFD88430000-0x00007FFD88625000-memory.dmp
memory/3552-14-0x00007FFD69D20000-0x00007FFD6A7E1000-memory.dmp
memory/3552-18-0x00007FFD784F0000-0x00007FFD78509000-memory.dmp
memory/3552-19-0x00007FFD69D20000-0x00007FFD6A7E1000-memory.dmp
memory/3552-20-0x00007FFD88430000-0x00007FFD88625000-memory.dmp
memory/4164-8-0x00007FFD6A3A0000-0x00007FFD6AE61000-memory.dmp
memory/4164-9-0x00007FFD784F0000-0x00007FFD78509000-memory.dmp
memory/4164-7-0x00007FFD88430000-0x00007FFD88625000-memory.dmp
memory/4164-2-0x0000000002EF0000-0x0000000002F00000-memory.dmp
memory/4164-1-0x00007FFD6A3A0000-0x00007FFD6AE61000-memory.dmp
memory/4164-0-0x0000000000E30000-0x0000000000E46000-memory.dmp