General

  • Target

    Wurst_Installer.exe

  • Size

    7.5MB

  • Sample

    240416-brdvgaff2v

  • MD5

    df6c57f4fe366f4ca90052b68398cae2

  • SHA1

    e08dc7d005e014071561cbc93232c01c4475f261

  • SHA256

    096111210234dc3917b632a0d8e1958fbbf7a9124ee1e8948fb74cb3c65fbbf0

  • SHA512

    04e8260460898d5d2f353def0e83215a3da8f5da796386fc2d8ac84ec1e9bf3cbcd34f9c705ebb9c7473cda0114d62aeb77d71dc7b4013dcfabe5e833b359e04

  • SSDEEP

    196608:tdgkqiCs/SeKQ0o8hFX52x9gAD60YOAHWH1:Hqev0oyF8wU2nWH1

Malware Config

Targets

    • Target

      Wurst_Installer.exe

    • Size

      7.5MB

    • MD5

      df6c57f4fe366f4ca90052b68398cae2

    • SHA1

      e08dc7d005e014071561cbc93232c01c4475f261

    • SHA256

      096111210234dc3917b632a0d8e1958fbbf7a9124ee1e8948fb74cb3c65fbbf0

    • SHA512

      04e8260460898d5d2f353def0e83215a3da8f5da796386fc2d8ac84ec1e9bf3cbcd34f9c705ebb9c7473cda0114d62aeb77d71dc7b4013dcfabe5e833b359e04

    • SSDEEP

      196608:tdgkqiCs/SeKQ0o8hFX52x9gAD60YOAHWH1:Hqev0oyF8wU2nWH1

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • UAC bypass

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Checks BIOS information in registry

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

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Obfuscated with Agile.Net obfuscator

      Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Suspicious use of NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Matrix ATT&CK v13

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Modify Registry

2
T1112

Virtualization/Sandbox Evasion

1
T1497

Discovery

Query Registry

3
T1012

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

4
T1082

Tasks