Analysis

  • max time kernel
    92s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    03-06-2022 15:16

General

  • Target

    1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe

  • Size

    1.7MB

  • MD5

    5052bb8fdec5fed9db55c44c11cfc568

  • SHA1

    a5b781562d536aeb098113257641b704c2d18715

  • SHA256

    1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa

  • SHA512

    1cef862fb24e26f37167fe385e47a5c22fc7f2a011315b9a019203ac94e651084d6cf059d0db7f0b1ef7a917cfdad8a3f56bf727a6c6178e0610c261b4a194fa

Malware Config

Extracted

Family

buer

C2

http://kload01.info/

http://kload02.info/

Signatures

  • Buer

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

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Buer Loader 7 IoCs

    Detects Buer loader in memory or disk.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Checks BIOS information in registry 2 TTPs 4 IoCs

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

  • Identifies Wine through registry keys 2 TTPs 2 IoCs

    Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe
    "C:\Users\Admin\AppData\Local\Temp\1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe"
    1⤵
    • Identifies VirtualBox via ACPI registry values (likely anti-VM)
    • Checks BIOS information in registry
    • Identifies Wine through registry keys
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2380
    • C:\ProgramData\UBlockPlugin\plugin.exe
      C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa.exe" ensgJJ
      2⤵
      • Modifies WinLogon for persistence
      • Identifies VirtualBox via ACPI registry values (likely anti-VM)
      • Executes dropped EXE
      • Checks BIOS information in registry
      • Identifies Wine through registry keys
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1452
      • C:\Windows\SysWOW64\secinit.exe
        C:\ProgramData\UBlockPlugin\plugin.exe
        3⤵
          PID:4324
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4324 -s 176
            4⤵
            • Program crash
            PID:4756
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 4324 -ip 4324
      1⤵
        PID:3532

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\UBlockPlugin\plugin.exe

        Filesize

        1.7MB

        MD5

        5052bb8fdec5fed9db55c44c11cfc568

        SHA1

        a5b781562d536aeb098113257641b704c2d18715

        SHA256

        1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa

        SHA512

        1cef862fb24e26f37167fe385e47a5c22fc7f2a011315b9a019203ac94e651084d6cf059d0db7f0b1ef7a917cfdad8a3f56bf727a6c6178e0610c261b4a194fa

      • C:\ProgramData\UBlockPlugin\plugin.exe

        Filesize

        1.7MB

        MD5

        5052bb8fdec5fed9db55c44c11cfc568

        SHA1

        a5b781562d536aeb098113257641b704c2d18715

        SHA256

        1286f05c8e544ee2a3c1818a28f4f05d9b2c5d802fc413cd210fadeb537437aa

        SHA512

        1cef862fb24e26f37167fe385e47a5c22fc7f2a011315b9a019203ac94e651084d6cf059d0db7f0b1ef7a917cfdad8a3f56bf727a6c6178e0610c261b4a194fa

      • memory/1452-140-0x000000003F900000-0x000000003FD4B000-memory.dmp

        Filesize

        4.3MB

      • memory/1452-144-0x000000003F900000-0x000000003FD4B000-memory.dmp

        Filesize

        4.3MB

      • memory/1452-143-0x000000003F900000-0x000000003FD4B000-memory.dmp

        Filesize

        4.3MB

      • memory/1452-142-0x000000003F900000-0x000000003FD4B000-memory.dmp

        Filesize

        4.3MB

      • memory/1452-141-0x0000000077990000-0x0000000077B33000-memory.dmp

        Filesize

        1.6MB

      • memory/2380-134-0x000000003FFA0000-0x00000000403EB000-memory.dmp

        Filesize

        4.3MB

      • memory/2380-139-0x0000000077990000-0x0000000077B33000-memory.dmp

        Filesize

        1.6MB

      • memory/2380-138-0x000000003FFA0000-0x00000000403EB000-memory.dmp

        Filesize

        4.3MB

      • memory/2380-130-0x000000003FFA0000-0x00000000403EB000-memory.dmp

        Filesize

        4.3MB

      • memory/2380-133-0x000000003FFA0000-0x00000000403EB000-memory.dmp

        Filesize

        4.3MB

      • memory/2380-132-0x000000003FFA0000-0x00000000403EB000-memory.dmp

        Filesize

        4.3MB

      • memory/2380-131-0x0000000077990000-0x0000000077B33000-memory.dmp

        Filesize

        1.6MB