Overview

overview

8

Static

static

3

Holzer.exe

windows7-x64

8

Holzer.exe

windows10-2004-x64

8

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General

  • Target

    Holzer.zip

  • Size

    50KB

  • Sample

    230509-xr6fdafe4z

  • MD5

    46c66dccda54ac15c941e7589a5da5ca

  • SHA1

    49a4f3b61753f261fc5f3e7d69f599ac0a5e083e

  • SHA256

    f7f624d237f1d81858259c1783be9c7a605fe260b22092af064bc91035010fef

  • SHA512

    c4c96aebf3d0de7127e3e45c5670323781ed8ae4bc0413c6b35cb2f5e9ee8ccaf84d5dbf655b384a1cec4b8d8fcbe5970c43e79bad76cf9a17ada1b3717c57a2

  • SSDEEP

    1536:5dlKxgjOc91+xkuSL7/jVqFqGBh8tCxFngg/:PlJjOc9WkuoQtF1gg/

Score
8/10
bootkitdiscoveryevasionpersistence

Malware Config

Targets

    • Target

      Holzer.exe

    • Size

      135KB

    • MD5

      c971c68b4e58ccc82802b21ae8488bc7

    • SHA1

      7305f3a0a0a0d489e0bcf664353289f61556de77

    • SHA256

      cede0b15d88c20bc750b516858f8bf31ee472f6cbd01640840890736c4333cce

    • SHA512

      ff199691c35f2748772410bf454e8b76dd67d892dd76fc87d20b3bbe6c145c6af1685344de636326692df792f55d0fba9a0025a7cf491d0b4e73ff45c3b039d7

    • SSDEEP

      3072:2EYGNIaWY/0kTKxIJXtJ0YCHiQtSetFITTTTTHvvvvvNKB:HN5TKvr9PuKB

    Score
    8/10
    bootkitevasionpersistencediscovery

    • Disables RegEdit via registry modification

      evasion

    • Disables Task Manager via registry modification

      evasion

    • Checks computer location settings

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

    • Modifies file permissions

      discovery

    • Enumerates connected drives

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

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

      bootkitpersistence

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Enterprise v6

Tasks