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

  • Sample

    200708-rkhd2eyrge

  • MD5

    db3c2530d727bac602e6c41cb3e60562

  • SHA1

    0d62d5a5fba84c1e826591f27892466a1cd59257

  • SHA256

    e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1

  • SHA512

    03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

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

    • MD5

      db3c2530d727bac602e6c41cb3e60562

    • SHA1

      0d62d5a5fba84c1e826591f27892466a1cd59257

    • SHA256

      e212e5bc428a0bca4615205f07c10d4e57dc881a2f32a9b8aeec040169435aa1

    • SHA512

      03e25d32a262c88ec2cf9303b7835da93b321a1d2a092531c96df8d95065944250f63c075792ca72b6d2a12d60c492782ba516712fbca0bf3b0239477b6b06e8

    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 Matrix ATT&CK v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

1
T1004

Privilege Escalation

Defense Evasion

Modify Registry

1
T1112

Credential Access

Discovery

Query Registry

1
T1012

Peripheral Device Discovery

1
T1120

System Information Discovery

2
T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Tasks