Analysis
- max time kernel
92s - max time network
138s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
23/03/2024, 02:23
General
- Target 8d07bba15f6b25a91f0c22cc94c0080539e5e1dd7864a1274def86312be11478.exe
- Size 47KB
- Sample240323-ct6tpseh7v
- SHA256 8d07bba15f6b25a91f0c22cc94c0080539e5e1dd7864a1274def86312be11478
Malware Config
Extracted
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asyncrat
-
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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hdiljmvrfdqyxyxpu
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delay
6
-
install
true
-
install_file
microseftor.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 1 IoCs
- Detects file containing reversed ASEP Autorun registry keys 2 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\8d07bba15f6b25a91f0c22cc94c0080539e5e1dd7864a1274def86312be11478.exe"C:\Users\Admin\AppData\Local\Temp\8d07bba15f6b25a91f0c22cc94c0080539e5e1dd7864a1274def86312be11478.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 8d07bba15f6b25a91f0c22cc94c0080539e5e1dd7864a1274def86312be11478 /tr '"C:\Users\Admin\AppData\Roaming\microseftor.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /ru system /rl highest /tn 8d07bba15f6b25a91f0c22cc94c0080539e5e1dd7864a1274def86312be11478 /tr '"C:\Users\Admin\AppData\Roaming\microseftor.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\tmp6C85.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\microseftor.exe"C:\Users\Admin\AppData\Roaming\microseftor.exe"3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
tmp6C85.tmp.bat
microseftor.exe
memory/2328-12-0x00007FFE85FC0000-0x00007FFE86A81000-memory.dmp
memory/2328-13-0x000000001B210000-0x000000001B220000-memory.dmp
memory/2328-16-0x00007FFE85FC0000-0x00007FFE86A81000-memory.dmp
memory/2328-17-0x000000001B210000-0x000000001B220000-memory.dmp
memory/2516-0-0x0000000000C90000-0x0000000000CA2000-memory.dmp
memory/2516-1-0x00007FFE86510000-0x00007FFE86FD1000-memory.dmp
memory/2516-2-0x0000000002E80000-0x0000000002E90000-memory.dmp
memory/2516-7-0x00007FFE86510000-0x00007FFE86FD1000-memory.dmp