Analysis
- max time kernel
90s - max time network
125s - platform
windows10-2004_x64 - resource
win10v2004-20220901-en - resource tags
- submitted
17/10/2022, 09:07
General
- Target file.exe
- Size 3.2MB
- Sample221017-k3a3dsbdgj
- SHA256 6ed5e19aac6c1cf5f1d2cd08f1db7fec2f1455fc79a9ddaa7cc45a8ce43a9fbe
Malware Config
Extracted
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vidar
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55
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1679
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http://138.201.90.120:80
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profile_id
1679
Signatures
- Vidar
Vidar is an infostealer based on Arkei stealer.
- Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- 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.
- Themida packer 9 IoCs
Detects Themida, an advanced Windows software protection system.
- Accesses 2FA software files, possible credential harvesting 2 TTPs
- 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.
- Checks whether UAC is enabled 1 TTPs 1 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- 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
- Kills process with taskkill 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\file.exe"C:\Users\Admin\AppData\Local\Temp\file.exe"1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- 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" 8ý/c taskkill /im file.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\file.exe" & del C:\PrograData\*.dll & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /im file.exe /f3⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\timeout.exetimeout /t 63⤵
- Delays execution with timeout.exe
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
mozglue.dll
nss3.dll
memory/2264-140-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-137-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-138-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-139-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-132-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-141-0x0000000061E00000-0x0000000061EF3000-memory.dmp
memory/2264-136-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-135-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-134-0x00000000777C0000-0x0000000077963000-memory.dmp
memory/2264-133-0x0000000000530000-0x0000000000E58000-memory.dmp
memory/2264-165-0x00000000777C0000-0x0000000077963000-memory.dmp
memory/2264-164-0x0000000000530000-0x0000000000E58000-memory.dmp