General

  • Target

    Bootstrapper.exe

  • Size

    797KB

  • Sample

    240911-z3lapateke

  • MD5

    4431cc5538d39fb9c499fc0341a1db01

  • SHA1

    5b547b1fcb6982d79a487588534c4cc4867073c8

  • SHA256

    64c8d087dd78291158fa3bada9c65ad2c6aa15b8c3a25324f9e71ae81c485666

  • SHA512

    bb5b9a105852fc09c82c0d0872cdb907e7a44d8b9b7fd72f8474003e2e55340f74ba07d681439df935b728ea53b34dcad3cf438f8918a640ad65b65601606106

  • SSDEEP

    3072:UTaFZMw6CyYwC+M2FEv80IZOA/CyYwC+M2FEv80IZOA0:yhY7X2Kvh4hY7X2Kvh

Malware Config

Targets

    • Target

      Bootstrapper.exe

    • Size

      797KB

    • MD5

      4431cc5538d39fb9c499fc0341a1db01

    • SHA1

      5b547b1fcb6982d79a487588534c4cc4867073c8

    • SHA256

      64c8d087dd78291158fa3bada9c65ad2c6aa15b8c3a25324f9e71ae81c485666

    • SHA512

      bb5b9a105852fc09c82c0d0872cdb907e7a44d8b9b7fd72f8474003e2e55340f74ba07d681439df935b728ea53b34dcad3cf438f8918a640ad65b65601606106

    • SSDEEP

      3072:UTaFZMw6CyYwC+M2FEv80IZOA/CyYwC+M2FEv80IZOA0:yhY7X2Kvh4hY7X2Kvh

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

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Downloads MZ/PE file

    • Event Triggered Execution: Image File Execution Options Injection

    • Checks BIOS information in registry

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

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    • Executes dropped EXE

    • Loads dropped DLL

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Blocklisted process makes network request

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Checks whether UAC is enabled

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Network Share Discovery

      Attempt to gather information on host network.

    • Checks system information in the registry

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

    • Enumerates processes with tasklist

    • Suspicious use of NtCreateThreadExHideFromDebugger

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks