Analysis

  • max time kernel
    141s
  • max time network
    140s
  • platform
    windows7_x64
  • resource
    win7v200430
  • submitted
    06-07-2020 07:30

General

  • Target

    070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083.exe

  • Size

    38KB

  • MD5

    d91043ee270758fbc29613e993cf17a6

  • SHA1

    bf3baf3e2d446f65b14d310e0e0a79d4002f9c03

  • SHA256

    070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083

  • SHA512

    1b8daad67e37e02835666acb1a815baccd235f955c95cf34bb28a9f4301eae32767919c1a473614da61ff7c0c0e646ac04317145228d6c57f02f3a0e55535000

Score
10/10

Malware Config

Extracted

Family

buer

C2

https://66.228.45.248/

https://server-linode.nl/

Signatures

  • Buer

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

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Buer Loader 4 IoCs

    Detects Buer loader in memory or disk.

  • Executes dropped EXE 1 IoCs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 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 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083.exe
    "C:\Users\Admin\AppData\Local\Temp\070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1528
    • C:\ProgramData\d27b15bf5fed4179aa6c\gennt.exe
      C:\ProgramData\d27b15bf5fed4179aa6c\gennt.exe "C:\Users\Admin\AppData\Local\Temp\070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083.exe" ensgJJ
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Deletes itself
      • Enumerates connected drives
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1828
      • C:\Windows\SysWOW64\secinit.exe
        C:\ProgramData\d27b15bf5fed4179aa6c\gennt.exe
        3⤵
          PID:1836
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" powershell.exe -Command "& {Add-MpPreference -ExclusionPath C:\ProgramData\d27b15bf5fed4179aa6c}"
          3⤵
            PID:1868

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\d27b15bf5fed4179aa6c\gennt.exe

        MD5

        d91043ee270758fbc29613e993cf17a6

        SHA1

        bf3baf3e2d446f65b14d310e0e0a79d4002f9c03

        SHA256

        070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083

        SHA512

        1b8daad67e37e02835666acb1a815baccd235f955c95cf34bb28a9f4301eae32767919c1a473614da61ff7c0c0e646ac04317145228d6c57f02f3a0e55535000

      • C:\ProgramData\d27b15bf5fed4179aa6c\gennt.exe

        MD5

        d91043ee270758fbc29613e993cf17a6

        SHA1

        bf3baf3e2d446f65b14d310e0e0a79d4002f9c03

        SHA256

        070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083

        SHA512

        1b8daad67e37e02835666acb1a815baccd235f955c95cf34bb28a9f4301eae32767919c1a473614da61ff7c0c0e646ac04317145228d6c57f02f3a0e55535000

      • \ProgramData\d27b15bf5fed4179aa6c\gennt.exe

        MD5

        d91043ee270758fbc29613e993cf17a6

        SHA1

        bf3baf3e2d446f65b14d310e0e0a79d4002f9c03

        SHA256

        070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083

        SHA512

        1b8daad67e37e02835666acb1a815baccd235f955c95cf34bb28a9f4301eae32767919c1a473614da61ff7c0c0e646ac04317145228d6c57f02f3a0e55535000

      • \ProgramData\d27b15bf5fed4179aa6c\gennt.exe

        MD5

        d91043ee270758fbc29613e993cf17a6

        SHA1

        bf3baf3e2d446f65b14d310e0e0a79d4002f9c03

        SHA256

        070d785aab37f9ac742f0c5ad255be4d46147ae9917960058fe5846a2e2e1083

        SHA512

        1b8daad67e37e02835666acb1a815baccd235f955c95cf34bb28a9f4301eae32767919c1a473614da61ff7c0c0e646ac04317145228d6c57f02f3a0e55535000

      • memory/1828-2-0x0000000000000000-mapping.dmp

      • memory/1868-4-0x0000000000000000-mapping.dmp