Overview

overview

10

Static

static

ReviewDocument.exe

windows7_x64

10

ReviewDocument.exe

windows10_x64

10

Analysis

  • max time kernel
    138s
  • max time network
    109s
  • platform
    windows7_x64
  • resource
    win7v200430
  • submitted
    14-07-2020 16:36

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General

  • Target

    ReviewDocument.exe

  • Size

    178KB

  • MD5

    9bd3bbc082d0b3446fd456d750a8bbbe

  • SHA1

    d50d739d91ff82ad31a6227ba734b6658f1a577a

  • SHA256

    63913936a820bf5e79bccb7ac74b80f78fae9aec0f2dbfa097f057227a2e4aa2

  • SHA512

    c0ba3a8a7a305dfc2539ef0ead8e418795532eb39a70571296e06d5b27c2cdd9425165dd88afbb90511c2bb68be5bd587c5233743a395d0b3dfe76d90a42bb7b

Score
10/10
buerloaderpersistence

Malware Config

Extracted

Family

buer

C2

https://162.244.81.87/

http://162.244.81.87:8080/

Signatures

  • Buer

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

    loaderbuer
  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
    persistence
  • Buer Loader 1 IoCs

    Detects Buer loader in memory or disk.

  • Executes dropped EXE 1 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

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

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ReviewDocument.exe
    "C:\Users\Admin\AppData\Local\Temp\ReviewDocument.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1312
    • C:\ProgramData\327dc086d52122b7ba88\gennt.exe
      C:\ProgramData\327dc086d52122b7ba88\gennt.exe "C:\Users\Admin\AppData\Local\Temp\ReviewDocument.exe" ensgJJ
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Deletes itself
      • Enumerates connected drives
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1740
      • C:\Windows\SysWOW64\secinit.exe
        C:\ProgramData\327dc086d52122b7ba88\gennt.exe
        3⤵
          PID:1848
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\327dc086d52122b7ba88}"
          3⤵
            PID:520

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • memory/1312-0-0x00000000001A0000-0x00000000001AC000-memory.dmp

        Filesize

        48KB

        Download