Overview

overview

10

Static

static

DocumentPreview.exe

windows7_x64

10

DocumentPreview.exe

windows10_x64

10

Sharing

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General

  • Target
    DocumentPreview.exe
  • Size 146KB
  • Sample200708-rkhd2eyrge
  • SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
  • MD5 SHA1 SHA512
Score
10/10
buerloaderpersistence

Malware Config

Extracted

Family

  • buer

C2

  • https://162.244.81.87/

  • http://162.244.81.87:8080/

Targets

    • Target
      DocumentPreview.exe
    • Size 146KB
    • SHA256 e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1
    • MD5 SHA1 SHA512
    Score
    10/10
    buerloaderpersistence

    • Buer

      Buer is a new modular loader first seen in August 2019.

      loaderbuer

    • Modifies WinLogon for persistence

      persistence

    • Buer Loader

      Detects Buer loader in memory or disk.

    • Executes dropped EXE

    • Deletes itself

    • Loads dropped DLL

    • Enumerates connected drives

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

    behavioral1behavioral2

MITRE ATT&CK Enterprise v6

Tasks