Overview

overview

10

Static

static

1

form.txt.exe

windows7_x64

10

form.txt.exe

windows10_x64

10

Analysis

  • max time kernel
    10s
  • max time network
    11s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    03/02/2021, 21:38

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General

  • Target
    form.txt.exe
  • Size 123KB
  • Sample210203-lar2cstdrx
  • SHA256 9cd888fa0692f8d0ca69548532ae72171b426d0e9d8b3b46acdbbe7636d653da
  • MD5 SHA1 SHA512
Score
10/10
buerloader

Malware Config

Extracted

Family

  • buer

C2

  • officewestbankingconc.com

Signatures

  • Buer

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

    loaderbuer
  • Buer Loader 1 IoCs

    Detects Buer loader in memory or disk.

  • Loads dropped DLL 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\form.txt.exe
    "C:\Users\Admin\AppData\Local\Temp\form.txt.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:1740
    • C:\Users\Admin\AppData\Local\Temp\form.txt.exe
      "C:\Users\Admin\AppData\Local\Temp\form.txt.exe"
      2⤵
        PID:800

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/800-5-0x0000000040000000-0x000000004000A000-memory.dmp
          Download

          memory/1740-2-0x00000000766F1000-0x00000000766F3000-memory.dmp
          Download