Analysis
- max time kernel
143s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
13/02/2024, 16:47
General
- Target 99a488d532eca43a10d3738556a18ffd.exe
- Size 6.6MB
- Sample240213-vahlwaec94
- SHA256 644de3a5de2ef66cd455ae70e50fe10ee356e2baa8df88fbb97eb56ea1d1a79c
Malware Config
Extracted
-
44caliber
-
https://discord.com/api/webhooks/879723240703012945/8DnUmlURQNBRTKRaHbyKS0ELGvIIdoIuBbkkbmM0ZcLBAJj3FlxCIcUk1VDLDyRi-RQK
Signatures
- 44Caliber
An open source infostealer written in C#.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 3 IoCs
- Loads dropped DLL 16 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Detects Pyinstaller 4 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\99a488d532eca43a10d3738556a18ffd.exe"C:\Users\Admin\AppData\Local\Temp\99a488d532eca43a10d3738556a18ffd.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\clarity.exe"C:\Users\Admin\AppData\Local\Temp\clarity.exe"2⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\clarity.exe"C:\Users\Admin\AppData\Local\Temp\clarity.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
-
-
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C:\Users\Admin\AppData\Local\Temp\Insidious.exe"C:\Users\Admin\AppData\Local\Temp\Insidious.exe"2⤵
- Executes dropped EXE
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
Process.txt
Process.txt
Process.txt
Process.txt
Insidious.exe
Insidious.exe
VCRUNTIME140.dll
_asyncio.pyd
_bz2.pyd
_ctypes.pyd
_lzma.pyd
_overlapped.pyd
_socket.pyd
_ssl.pyd
base_library.zip
libcrypto-1_1.dll
libcrypto-1_1.dll
libcrypto-1_1.dll
libffi-7.dll
libssl-1_1.dll
python39.dll
python39.dll
pywintypes39.dll
select.pyd
win32console.pyd
clarity.exe
clarity.exe
clarity.exe
clarity.exe
memory/3820-64-0x00007FFBE5710000-0x00007FFBE61D1000-memory.dmp
memory/3820-0-0x00000000004E0000-0x0000000000B7C000-memory.dmp
memory/3820-2-0x0000000002D00000-0x0000000002D10000-memory.dmp
memory/3820-1-0x00007FFBE5710000-0x00007FFBE61D1000-memory.dmp
memory/5112-43-0x00007FFBE5710000-0x00007FFBE61D1000-memory.dmp
memory/5112-37-0x00000000008F0000-0x000000000093A000-memory.dmp
memory/5112-59-0x000000001B650000-0x000000001B660000-memory.dmp
memory/5112-203-0x00007FFBE5710000-0x00007FFBE61D1000-memory.dmp