Analysis
- max time kernel
143s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20230915-en - resource tags
- submitted
30/09/2023, 22:36
General
- Target file.exe
- Size 234KB
- Sample230930-2h8llahc52
- SHA256 421f7e7128482d501fc4c7d44748061d9572f8a1b053bd07cb5fe16e9dcc4428
Malware Config
Extracted
-
stealc
-
url_path
/e9c345fc99a4e67e.php
Signatures
- Stealc
Stealc is an infostealer written in C++.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL 2 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
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Program crash 1 IoCs
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Checks computer location settings
- Loads dropped DLL
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & del "C:\ProgramData\*.dll"" & exit2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\timeout.exetimeout /t 53⤵
- Delays execution with timeout.exe
-
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 1672 -s 27602⤵
- Program crash
-
-
C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 1672 -ip 16721⤵
-
C:\Windows\system32\rundll32.exe"C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe1⤵
-
C:\Windows\System32\svchost.exeC:\Windows\System32\svchost.exe -k UnistackSvcGroup1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
Are.docx
mozglue.dll
mozglue.dll
nss3.dll
memory/1672-51-0x00000000008A0000-0x00000000008B5000-memory.dmp
memory/1672-1-0x0000000002260000-0x000000000227B000-memory.dmp
memory/1672-52-0x0000000002260000-0x000000000227B000-memory.dmp
memory/1672-56-0x0000000000400000-0x000000000062D000-memory.dmp
memory/1672-41-0x0000000000400000-0x000000000062D000-memory.dmp
memory/1672-3-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/1672-2-0x0000000000400000-0x000000000062D000-memory.dmp
memory/1672-0-0x00000000008A0000-0x00000000008B5000-memory.dmp
memory/1672-93-0x0000000000400000-0x000000000062D000-memory.dmp
memory/1672-95-0x0000000000400000-0x000000000062D000-memory.dmp
memory/5100-96-0x0000028DFD480000-0x0000028DFD490000-memory.dmp
memory/5100-112-0x0000028DFD580000-0x0000028DFD590000-memory.dmp
memory/5100-128-0x0000028DFD8F0000-0x0000028DFD8F1000-memory.dmp
memory/5100-130-0x0000028DFD920000-0x0000028DFD921000-memory.dmp
memory/5100-131-0x0000028DFD920000-0x0000028DFD921000-memory.dmp
memory/5100-132-0x0000028DFDA30000-0x0000028DFDA31000-memory.dmp