Overview

overview

10

Static

static

Invoice.xlsb

windows7_x64

10

Invoice.xlsb

windows10_x64

10

Analysis

  • max time kernel
    138s
  • max time network
    133s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    15/12/2020, 15:20

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General

  • Target
    Invoice.xlsb
  • Size 155KB
  • Sample201215-fyjsnn35hj
  • SHA256 45cc417aeb30d7aaba675077c10f70d66ee9b1b8b4820f0469221f0a87fe9545
  • MD5 SHA1 SHA512
Score
10/10
buerloader

Malware Config

Extracted

Family

  • buer

C2

  • softwareconsbank.com

Signatures

  • Buer

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

    loaderbuer
  • Buer Loader 3 IoCs

    Detects Buer loader in memory or disk.

  • Executes dropped EXE 2 IoCs
  • 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.

  • NSIS installer 6 IoCs
    installer
  • Checks processor information in registry 2 TTPs 3 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of SetWindowsHookEx 12 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
    "C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\Invoice.xlsb"
    1⤵
    • Checks processor information in registry
    • Enumerates system info in registry
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1924
    • C:\GSEER\GefeDFpa\spoolv.exe
      "C:\GSEER\GefeDFpa\spoolv.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of WriteProcessMemory
      PID:1956
      • C:\GSEER\GefeDFpa\spoolv.exe
        "C:\GSEER\GefeDFpa\spoolv.exe"
        3⤵
        • Executes dropped EXE
        PID:3816

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/1924-2-0x00007FFB89D70000-0x00007FFB8A3A7000-memory.dmp
        Download

        memory/3816-7-0x0000000040000000-0x0000000040009000-memory.dmp
        Download

        memory/3816-10-0x0000000040000000-0x0000000040009000-memory.dmp
        Download