Analysis
- max time kernel
8s - max time network
149s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
24/08/2026, 16:59
General
- Target 42d456327573520ea9f39a59f6995f4576d2c8b97b322db5100732f7a417a15f.exe
- Size 63KB
- Sample260824-vhsf2sec27
- SHA256 42d456327573520ea9f39a59f6995f4576d2c8b97b322db5100732f7a417a15f
Malware Config
Extracted
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asyncrat
-
5.0.5
-
Clients
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fb88l.co.com:4449
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fb88l.co.com:443
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rter-adfa-egf0aeg342-t
-
delay
1
-
install
true
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install_file
fb88l.exe
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install_folder
%Temp%
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
- 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.
- 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 64 IoCs
- Suspicious use of AdjustPrivilegeToken 4 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
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C:\Users\Admin\AppData\Local\Temp\42d456327573520ea9f39a59f6995f4576d2c8b97b322db5100732f7a417a15f.exe"C:\Users\Admin\AppData\Local\Temp\42d456327573520ea9f39a59f6995f4576d2c8b97b322db5100732f7a417a15f.exe"1⤵
- 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 "fb88l" /tr '"C:\Users\Admin\AppData\Local\Temp\fb88l.exe"' & exit2⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "fb88l" /tr '"C:\Users\Admin\AppData\Local\Temp\fb88l.exe"'3⤵
- Scheduled Task/Job: Scheduled Task
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-
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCBF6.tmp.bat""2⤵
- Executes a command shell one-liner
- 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\Local\Temp\fb88l.exe"C:\Users\Admin\AppData\Local\Temp\fb88l.exe"3⤵
- Executes dropped EXE
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C:\Users\Admin\AppData\Local\Temp\fb88l.exe"C:\Users\Admin\AppData\Local\Temp\fb88l.exe"1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
fb88l.exe
tmpCBF6.tmp.bat
memory/2960-0-0x0000000000F10000-0x0000000000F26000-memory.dmp
memory/2960-1-0x00007FFC3D47F000-0x00007FFC3D480000-memory.dmp
memory/2960-2-0x00007FFC3D2F0000-0x00007FFC3DC94000-memory.dmp
memory/2960-3-0x00007FFC3D2F0000-0x00007FFC3DC94000-memory.dmp
memory/2960-4-0x00007FFC3D2F0000-0x00007FFC3DC94000-memory.dmp
memory/2960-5-0x00007FFC3D2F0000-0x00007FFC3DC94000-memory.dmp
memory/2960-9-0x00007FFC3D2F0000-0x00007FFC3DC94000-memory.dmp