Analysis
- max time kernel
148s - max time network
149s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
27/10/2026, 02:48
General
- Target splwow.exe
- Size 962KB
- Sample261027-dav4jaxy6q
- SHA256 75c2f12971057a45536a988ec82f7dc1fab40113d3f1cfd3a0fe1f19c79d2170
Malware Config
Extracted
-
asyncrat
-
1.0.7
-
Admin
-
DcRatMutex_0101010101010100101001010100101010100101
-
delay
5
-
install
true
-
install_file
Defender.exe
-
install_folder
%AppData%
-
pastebin_config
https://pastebin.com/raw/JvYZi5A2
Signatures
- Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
- Async RAT payload 1 IoCs
- Executes dropped EXE 2 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 2 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- Delays execution with timeout.exe 1 IoCs
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 31 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 5 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\splwow.exe"C:\Users\Admin\AppData\Local\Temp\splwow.exe"1⤵
- 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 "Defender" /tr '"C:\Users\Admin\AppData\Roaming\Defender.exe"' & exit2⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "Defender" /tr '"C:\Users\Admin\AppData\Roaming\Defender.exe"'3⤵
- Scheduled Task/Job: Scheduled Task
-
-
-
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp1D52.tmp.bat""2⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
-
-
C:\Users\Admin\AppData\Roaming\Defender.exe"C:\Users\Admin\AppData\Roaming\Defender.exe"3⤵
- Executes dropped EXE
-
-
-
C:\Users\Admin\AppData\Roaming\Defender.exe"C:\Users\Admin\AppData\Roaming\Defender.exe"1⤵
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
tmp1D52.tmp.bat
Defender.exe
memory/2548-14-0x0000000000400000-0x00000000004F8000-memory.dmp
memory/3228-0-0x0000000000180000-0x000000000019A000-memory.dmp
memory/3228-1-0x00007FF866A6F000-0x00007FF866A70000-memory.dmp
memory/3228-2-0x00000000026F0000-0x0000000002706000-memory.dmp
memory/3228-3-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/3228-4-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/3228-8-0x0000000000400000-0x00000000004F8000-memory.dmp
memory/3228-9-0x00007FF8668E0000-0x00007FF867284000-memory.dmp
memory/4496-15-0x0000000000400000-0x00000000004F8000-memory.dmp