Analysis
- max time kernel
134s - max time network
124s - platform
windows10-2004_x64 - resource
win10v2004-20240611-en - resource tags
- submitted
25/06/2024, 22:35
General
- Target b8c9903b1ba9c296480f4cfed2f5fe1c7674065e075d009e045c100f5b3bac19.exe
- Size 2.2MB
- Sample240625-2ht37szfmp
- SHA256 b8c9903b1ba9c296480f4cfed2f5fe1c7674065e075d009e045c100f5b3bac19
Malware Config
Extracted
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vidar
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https://t.me/g067n
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https://steamcommunity.com/profiles/76561199707802586
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user_agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:129.0) Gecko/20100101 Firefox/129.0
Signatures
- Detect Vidar Stealer 16 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 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 8 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\b8c9903b1ba9c296480f4cfed2f5fe1c7674065e075d009e045c100f5b3bac19.exe"C:\Users\Admin\AppData\Local\Temp\b8c9903b1ba9c296480f4cfed2f5fe1c7674065e075d009e045c100f5b3bac19.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\kat3DD4.tmpC:\Users\Admin\AppData\Local\Temp\kat3DD4.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\kat3DD4.tmp" & rd /s /q "C:\ProgramData\GDBFCGIIIJDB" & 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
kat3DD4.tmp
memory/1184-60-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-34-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-4-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-33-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-74-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-8-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-22-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-23-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-73-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-25-0x0000000020290000-0x00000000204EF000-memory.dmp
memory/1184-9-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-42-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-43-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-59-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-72-0x0000000000400000-0x0000000000648000-memory.dmp
memory/1184-71-0x0000000000400000-0x0000000000648000-memory.dmp
memory/2064-0-0x00000000007D0000-0x00000000007D1000-memory.dmp
memory/2064-1-0x0000000002B40000-0x0000000002C50000-memory.dmp
memory/2064-10-0x0000000000400000-0x0000000000641000-memory.dmp