Analysis
- max time kernel
91s - max time network
148s - platform
windows10-2004_x64 - resource
win10v2004-20230831-en - resource tags
- submitted
04/09/2023, 01:52
General
- Target 641926faa61b285dc56392e849301861e5f786a3e45a7373dd334f34aa65d40d.exe
- Size 47KB
- Sample230904-capfbadg25
- SHA256 641926faa61b285dc56392e849301861e5f786a3e45a7373dd334f34aa65d40d
Malware Config
Extracted
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asyncrat
-
0.5.7B
-
Default
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65.108.24.87:6606
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65.108.24.87:7707
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65.108.24.87:8808
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AsyncMutex_6SI8OkPnk
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delay
3
-
install
true
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install_file
win10.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 21 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\641926faa61b285dc56392e849301861e5f786a3e45a7373dd334f34aa65d40d.exe"C:\Users\Admin\AppData\Local\Temp\641926faa61b285dc56392e849301861e5f786a3e45a7373dd334f34aa65d40d.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "win10" /tr '"C:\Users\Admin\AppData\Roaming\win10.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "win10" /tr '"C:\Users\Admin\AppData\Roaming\win10.exe"'3⤵
- Creates scheduled task(s)
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBEBC.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Roaming\win10.exe"C:\Users\Admin\AppData\Roaming\win10.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
tmpBEBC.tmp.bat
win10.exe
win10.exe
memory/3544-14-0x00000000057C0000-0x00000000057D0000-memory.dmp
memory/3544-13-0x0000000074810000-0x0000000074FC0000-memory.dmp
memory/3544-15-0x0000000006100000-0x00000000066A4000-memory.dmp
memory/3544-16-0x0000000005BC0000-0x0000000005C26000-memory.dmp
memory/3544-17-0x0000000074810000-0x0000000074FC0000-memory.dmp
memory/3544-18-0x00000000057C0000-0x00000000057D0000-memory.dmp
memory/4892-8-0x00000000748B0000-0x0000000075060000-memory.dmp
memory/4892-3-0x0000000004A70000-0x0000000004B0C000-memory.dmp
memory/4892-2-0x00000000048C0000-0x00000000048D0000-memory.dmp
memory/4892-1-0x00000000748B0000-0x0000000075060000-memory.dmp
memory/4892-0-0x0000000000040000-0x0000000000052000-memory.dmp