Overview

overview

10

Static

static

1

ServApi.exe

windows7_x64

10

ServApi.exe

windows10_x64

10

Analysis

  • max time kernel
    140s
  • max time network
    143s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    02/03/2021, 20:17

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General

  • Target
    ServApi.exe
  • Size 281KB
  • Sample210302-pf8fxnpbh6
  • SHA256 f2a883a0e4b01c72b0f063df3be5a0102e5c8fbaedc39c8d35c632b200599283
  • MD5 SHA1 SHA512
Score
10/10
buerloader

Malware Config

Extracted

Family

  • buer

C2

  • verstudiosan.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 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ServApi.exe
    "C:\Users\Admin\AppData\Local\Temp\ServApi.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetThreadContext
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:4808
    • C:\Users\Admin\AppData\Local\Temp\ServApi.exe
      "C:\Users\Admin\AppData\Local\Temp\ServApi.exe"
      2⤵
        PID:892

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/892-4-0x0000000040000000-0x0000000040009000-memory.dmp
          Download