Analysis
- max time kernel
149s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20240426-en - resource tags
- submitted
04/06/2024, 00:11
General
- Target b87fdfa08b98fe95ac0aae4fa627d2561a3125e1d0837fbe2624965313ee6365.exe
- Size 1.8MB
- Sample240604-ag12ksec5t
- SHA256 b87fdfa08b98fe95ac0aae4fa627d2561a3125e1d0837fbe2624965313ee6365
Malware Config
Extracted
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stealc
Extracted
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vidar
-
https://t.me/ta904ek
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https://steamcommunity.com/profiles/76561199695752269
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user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0
Signatures
- Detect Vidar Stealer 13 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.
- Executes dropped EXE 1 IoCs
- Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
- 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 14 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\b87fdfa08b98fe95ac0aae4fa627d2561a3125e1d0837fbe2624965313ee6365.exe"C:\Users\Admin\AppData\Local\Temp\b87fdfa08b98fe95ac0aae4fa627d2561a3125e1d0837fbe2624965313ee6365.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\kat3C8C.tmpC:\Users\Admin\AppData\Local\Temp\kat3C8C.tmp2⤵
- Checks computer location settings
- Executes dropped EXE
- 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 & del /f /q "C:\Users\Admin\AppData\Local\Temp\kat3C8C.tmp" & rd /s /q "C:\ProgramData\IEHCBAFIDAEC" & exit3⤵
- Suspicious use of WriteProcessMemory
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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
kat3C8C.tmp
memory/2912-14-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-32-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-62-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-9-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-61-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-4-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-8-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-31-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-16-0x00000000192B0000-0x000000001950F000-memory.dmp
memory/2912-60-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-13-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-48-0x0000000000400000-0x0000000000649000-memory.dmp
memory/2912-49-0x0000000000400000-0x0000000000649000-memory.dmp
memory/3380-0-0x0000000002320000-0x0000000002321000-memory.dmp
memory/3380-2-0x00000000029E0000-0x0000000002B2C000-memory.dmp
memory/3380-10-0x0000000000400000-0x00000000005CE000-memory.dmp