Analysis

  • max time kernel
    167s
  • max time network
    136s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    25-06-2022 05:17

General

  • Target

    48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930.exe

  • Size

    253KB

  • MD5

    5c86e45799654b4ff55e5f84d4a483e2

  • SHA1

    f840b9b62d1b4c8072883876edf03a2274323a7f

  • SHA256

    48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930

  • SHA512

    c91c1240567eeace40e1cc37580b729fe43040b370b13a7a247c0c706478290855745397cb0f8ba6e79a58b552f66ea2e75fc8f3dd494359776d2e7b978164cf

Score
10/10

Malware Config

Extracted

Family

buer

C2

https://95.217.81.68/

http://95.217.81.68:8080/

Signatures

  • Buer

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

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Buer Loader 5 IoCs

    Detects Buer loader in memory or disk.

  • Executes dropped EXE 1 IoCs
  • Program crash 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930.exe
    "C:\Users\Admin\AppData\Local\Temp\48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4224
    • C:\ProgramData\ErrorResponder\errorResponder.exe
      C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930.exe" ensgJJ
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3692
      • C:\Windows\SysWOW64\secinit.exe
        C:\ProgramData\ErrorResponder\errorResponder.exe
        3⤵
          PID:2892
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2892 -s 272
            4⤵
            • Program crash
            PID:3144
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4224 -s 440
        2⤵
        • Program crash
        PID:4404
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4224 -s 472
        2⤵
        • Program crash
        PID:1528
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4224 -ip 4224
      1⤵
        PID:2020
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4224 -ip 4224
        1⤵
          PID:4356
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 2892 -ip 2892
          1⤵
            PID:3536

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\ProgramData\ErrorResponder\errorResponder.exe

            Filesize

            253KB

            MD5

            5c86e45799654b4ff55e5f84d4a483e2

            SHA1

            f840b9b62d1b4c8072883876edf03a2274323a7f

            SHA256

            48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930

            SHA512

            c91c1240567eeace40e1cc37580b729fe43040b370b13a7a247c0c706478290855745397cb0f8ba6e79a58b552f66ea2e75fc8f3dd494359776d2e7b978164cf

          • C:\ProgramData\ErrorResponder\errorResponder.exe

            Filesize

            253KB

            MD5

            5c86e45799654b4ff55e5f84d4a483e2

            SHA1

            f840b9b62d1b4c8072883876edf03a2274323a7f

            SHA256

            48169d26f0752a5bb08334a4a41bbd2cc890c326fc0115e3b9ac1db6f9741930

            SHA512

            c91c1240567eeace40e1cc37580b729fe43040b370b13a7a247c0c706478290855745397cb0f8ba6e79a58b552f66ea2e75fc8f3dd494359776d2e7b978164cf

          • memory/2892-142-0x0000000000C00000-0x0000000004EDB000-memory.dmp

            Filesize

            66.9MB

          • memory/3692-139-0x0000000040000000-0x00000000442DB000-memory.dmp

            Filesize

            66.9MB

          • memory/3692-138-0x000000000079D000-0x00000000007A4000-memory.dmp

            Filesize

            28KB

          • memory/4224-134-0x0000000040000000-0x00000000442DB000-memory.dmp

            Filesize

            66.9MB

          • memory/4224-133-0x00000000004AE000-0x00000000004B6000-memory.dmp

            Filesize

            32KB

          • memory/4224-130-0x00000000004AE000-0x00000000004B6000-memory.dmp

            Filesize

            32KB

          • memory/4224-140-0x0000000040000000-0x00000000442DB000-memory.dmp

            Filesize

            66.9MB

          • memory/4224-132-0x0000000040000000-0x00000000442DB000-memory.dmp

            Filesize

            66.9MB

          • memory/4224-131-0x0000000000480000-0x000000000048A000-memory.dmp

            Filesize

            40KB