Analysis
- max time kernel
160s - max time network
170s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
07/05/2023, 12:54
General
- Target FD19B8ABD59BEDA896E4B6BBB96FB1D2888460DCF107C.exe
- Size 47KB
- Sample230507-p5btxsef74
- SHA256 fd19b8abd59beda896e4b6bbb96fb1d2888460dcf107cd584319cba66e264d91
Malware Config
Extracted
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asyncrat
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0.5.6D
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Default
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seznam.zapto.org:6606
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seznam.zapto.org:7707
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seznam.zapto.org:8808
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milla.publicvm.com:6606
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milla.publicvm.com:7707
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milla.publicvm.com:8808
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cqlfsjnbjoef
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delay
9
-
install
true
-
install_file
explorir.exe
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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
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C:\Users\Admin\AppData\Local\Temp\FD19B8ABD59BEDA896E4B6BBB96FB1D2888460DCF107C.exe"C:\Users\Admin\AppData\Local\Temp\FD19B8ABD59BEDA896E4B6BBB96FB1D2888460DCF107C.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 /ru system /rl highest /tn FD19B8ABD59BEDA896E4B6BBB96FB1D2888460DCF107C /tr '"C:\Users\Admin\AppData\Roaming\explorir.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /ru system /rl highest /tn FD19B8ABD59BEDA896E4B6BBB96FB1D2888460DCF107C /tr '"C:\Users\Admin\AppData\Roaming\explorir.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\tmpF9F5.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\explorir.exe"C:\Users\Admin\AppData\Roaming\explorir.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
tmpF9F5.tmp.bat
explorir.exe
explorir.exe
memory/1404-143-0x00000000030E0000-0x00000000030F0000-memory.dmp
memory/1404-144-0x00000000030E0000-0x00000000030F0000-memory.dmp
memory/2624-133-0x00000000004E0000-0x00000000004F2000-memory.dmp
memory/2624-134-0x000000001B310000-0x000000001B320000-memory.dmp