Analysis
- max time kernel
81s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20230220-en - resource tags
- submitted
24/03/2023, 12:51
General
- Target a92bef216bec5b6fcc6a958305f81391.exe
- Size 127KB
- Sample230324-p3gmdsed48
- SHA256 7b9a9b11fc9794d4e31d647a3cab02fecdb048e81bc13d37d1c3533b8e96a8d3
Malware Config
Extracted
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asyncrat
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| Edit 3LOSH RAT
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AsyncMutex_7SI8OkPnk
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delay
3
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install
true
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install_file
ContainerRuntime.exe
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install_folder
%AppData%
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pastebin_config
https://pastebin.com/raw/YgX9vKea
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
- Legitimate hosting services abused for malware hosting/C2 1 TTPs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- 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 26 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\a92bef216bec5b6fcc6a958305f81391.exe"C:\Users\Admin\AppData\Local\Temp\a92bef216bec5b6fcc6a958305f81391.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 "ContainerRuntime" /tr '"C:\Users\Admin\AppData\Roaming\ContainerRuntime.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "ContainerRuntime" /tr '"C:\Users\Admin\AppData\Roaming\ContainerRuntime.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\tmp7D05.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\ContainerRuntime.exe"C:\Users\Admin\AppData\Roaming\ContainerRuntime.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
tmp7D05.tmp.bat
ContainerRuntime.exe
ContainerRuntime.exe
memory/1608-133-0x0000000000B00000-0x0000000000B26000-memory.dmp
memory/1608-134-0x0000000002F00000-0x0000000002F10000-memory.dmp
memory/1608-135-0x0000000005660000-0x00000000056FC000-memory.dmp
memory/4272-144-0x00000000057F0000-0x0000000005800000-memory.dmp
memory/4272-145-0x00000000060F0000-0x0000000006694000-memory.dmp
memory/4272-146-0x0000000005CE0000-0x0000000005D72000-memory.dmp
memory/4272-147-0x0000000006960000-0x000000000696A000-memory.dmp
memory/4272-148-0x0000000006C80000-0x0000000006CE6000-memory.dmp
memory/4272-149-0x00000000057F0000-0x0000000005800000-memory.dmp