Analysis
- max time kernel
143s - max time network
146s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
26/12/2023, 00:03
General
- Target YoudaoDict.exe
- Size 6.8MB
- Sample231226-acdeqabcfk
- SHA256 a238bd522702802eb2a2b71b4b00a1a1553b1c2fff0d8b9e50b13e999cabbdf3
Score
10/10
Malware Config
Extracted
Family
-
marsstealer
Botnet
-
Default
C2
-
www.moscow-post.ru/ryuka/grocktack/fdzeiw.php
Signatures
- Mars Stealer
An infostealer written in C++ based on other infostealers.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\YoudaoDict.exe"C:\Users\Admin\AppData\Local\Temp\YoudaoDict.exe"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
-
C:\ProgramData\TW1YO8D7G27XSA.exe"C:\ProgramData\TW1YO8D7G27XSA.exe"2⤵
- Executes dropped EXE
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 2244 -s 13923⤵
- Program crash
-
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2244 -ip 22441⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
TW1YO8D7G27XSA.exe
memory/2244-10-0x0000000000400000-0x000000000043D000-memory.dmp
memory/2244-14-0x0000000000400000-0x000000000043D000-memory.dmp
memory/2400-0-0x00000000008D0000-0x0000000000958000-memory.dmp
memory/2400-1-0x00000000751B0000-0x0000000075960000-memory.dmp
memory/2400-12-0x00000000751B0000-0x0000000075960000-memory.dmp