General

  • Target

    Bootstrapper.exe

  • Size

    796KB

  • Sample

    240819-bmkr8ayhkr

  • MD5

    76639ab92661f5c384302899934051ab

  • SHA1

    9b33828f8ad3a686ff02b1a4569b8ae38128caed

  • SHA256

    6bb9ad960bcc9010db1b9918369bdfc4558f19287b5b6562079c610a28320178

  • SHA512

    928e4374c087070f8a6786f9082f05a866751ea877edf9afa23f6941dfc4d6762e1688bbb135788d6286ec324fa117fc60b46fed2f6e3a4ab059465a00f2ebee

  • SSDEEP

    12288:THeLH6iTPSE54sgweI9oaQJj3r+piq+77xOZ+eMm:THeLHdTSEeyoaQJj3Spiq+77xd

Malware Config

Targets

    • Target

      Bootstrapper.exe

    • Size

      796KB

    • MD5

      76639ab92661f5c384302899934051ab

    • SHA1

      9b33828f8ad3a686ff02b1a4569b8ae38128caed

    • SHA256

      6bb9ad960bcc9010db1b9918369bdfc4558f19287b5b6562079c610a28320178

    • SHA512

      928e4374c087070f8a6786f9082f05a866751ea877edf9afa23f6941dfc4d6762e1688bbb135788d6286ec324fa117fc60b46fed2f6e3a4ab059465a00f2ebee

    • SSDEEP

      12288:THeLH6iTPSE54sgweI9oaQJj3r+piq+77xOZ+eMm:THeLHdTSEeyoaQJj3Spiq+77xd

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

    • Downloads MZ/PE file

    • 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.

    • Executes dropped EXE

    • Loads dropped DLL

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Blocklisted process makes network request

    • 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

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Suspicious use of NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Enterprise v15

Tasks