stealc | b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Identifies Wine through registry keys 2 TTPs 1 IoCs

Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

evasion

Query Registry

Virtualization/Sandbox Evasion

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Software\Wine	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Loads dropped DLL 1 IoCs

pid	Process
2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Reads data files stored by FTP clients 2 TTPs
Tries to access configuration files associated with programs like FileZilla.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Unsecured Credentials: Credentials In Files 1 TTPs
Steal credentials from unsecured files.
credential_access stealer

Credentials In Files
T1552.001
Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3664	timeout.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2944 wrote to memory of 208	2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe	86
PID 2944 wrote to memory of 208	2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe	86
PID 2944 wrote to memory of 208	2944	b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe	86
PID 208 wrote to memory of 3664	208	cmd.exe	88
PID 208 wrote to memory of 3664	208	cmd.exe	88
PID 208 wrote to memory of 3664	208	cmd.exe	88

C:\Users\Admin\AppData\Local\Temp\b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe
"C:\Users\Admin\AppData\Local\Temp\b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe"
1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks computer location settings
- Identifies Wine through registry keys
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2944
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\system32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\b4db52719419f608b6b9d01ca88942cf1e27dd03b5509d8b1e36c6d9f1925b3a.exe" & del "C:\ProgramData\*.dll"" & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:208
- - C:\Windows\SysWOW64\timeout.exe
    timeout /t 5
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3664

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Virtualization/Sandbox Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

6

System Information Discovery

4

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Virtualization/Sandbox Evasion