Analysis
- max time kernel
140s - max time network
128s - platform
windows10-2004_x64 - resource
win10v2004-20240508-en - resource tags
- submitted
17/05/2024, 16:08
General
- Target a2f94952c89ea440f82877365db5b4a5cf14a10e4168a22a92fce4a8fd98404f.exe
- Size 363KB
- Sample240517-tk9bxafe78
- SHA256 a2f94952c89ea440f82877365db5b4a5cf14a10e4168a22a92fce4a8fd98404f
Malware Config
Extracted
-
stealc
Signatures
- Detect Vidar Stealer 11 IoCs
- Stealc
Stealc is an infostealer written in C++.
- Vidar
Vidar is an infostealer based on Arkei stealer.
- Downloads MZ/PE file
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- Reads user/profile data of local email clients 2 TTPs
Email clients store some user data on disk where infostealers will often target it.
- 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.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of WriteProcessMemory 15 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\a2f94952c89ea440f82877365db5b4a5cf14a10e4168a22a92fce4a8fd98404f.exe"C:\Users\Admin\AppData\Local\Temp\a2f94952c89ea440f82877365db5b4a5cf14a10e4168a22a92fce4a8fd98404f.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"2⤵
- Checks computer location settings
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\HIDGCFBFBFBK" & exit3⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\timeout.exetimeout /t 104⤵
- Delays execution with timeout.exe
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
memory/3364-0-0x00000000009B0000-0x00000000009B1000-memory.dmp
memory/3364-1-0x00000000009B0000-0x00000000009B1000-memory.dmp
memory/3364-3-0x00000000009B0000-0x00000000009B1000-memory.dmp
memory/4356-2-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-5-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-7-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-14-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-15-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-17-0x0000000019410000-0x000000001966F000-memory.dmp
memory/4356-32-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-33-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-49-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-50-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-67-0x0000000000400000-0x0000000000646000-memory.dmp
memory/4356-68-0x0000000000400000-0x0000000000646000-memory.dmp