Analysis

  • max time kernel
    151s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26-12-2023 12:17

General

  • Target

    6dde0ef221978abe0a4dc088dc5dde52.exe

  • Size

    53KB

  • MD5

    6dde0ef221978abe0a4dc088dc5dde52

  • SHA1

    cdbe09c9922f34c1f77d29abdf2e83c7704afef7

  • SHA256

    f00e4480a92e46fa7a38dcd06c03ba54ddbe61b0edbe5ac303c0eed6453b0f41

  • SHA512

    3e17623cb8efbf312f0e480136a27aeefb7d6e87f66c91269296a0b9a38c1f4e06e7019d87570f732524fb7961c8c29e374fc1ee6e404e67ceaf18dcfb3664e4

  • SSDEEP

    1536:Yk8s7JfjsCwzvEymEWc94qxdRHdno858c5Fgs0:YkTJfjsCw7FWujxDdnE

Score
10/10

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 16 IoCs
  • Modifies visibility of file extensions in Explorer 2 TTPs 8 IoCs
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 8 IoCs
  • Adds policy Run key to start application 2 TTPs 18 IoCs
  • Disables RegEdit via registry modification 8 IoCs
  • Drops file in Drivers directory 1 IoCs
  • Checks computer location settings 2 TTPs 4 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 7 IoCs
  • Adds Run key to start application 2 TTPs 16 IoCs
  • Enumerates connected drives 3 TTPs 21 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in System32 directory 64 IoCs
  • Drops file in Windows directory 39 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Discovers systems in the same network 1 TTPs 1 IoCs
  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6dde0ef221978abe0a4dc088dc5dde52.exe
    "C:\Users\Admin\AppData\Local\Temp\6dde0ef221978abe0a4dc088dc5dde52.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Modifies visibility of file extensions in Explorer
    • Modifies visiblity of hidden/system files in Explorer
    • Adds policy Run key to start application
    • Disables RegEdit via registry modification
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1068
    • C:\Windows\SysWOW64\s4827\smss.exe
      "C:\Windows\system32\s4827\smss.exe" ~Brontok~Log~
      2⤵
      • Modifies WinLogon for persistence
      • Modifies visibility of file extensions in Explorer
      • Modifies visiblity of hidden/system files in Explorer
      • Adds policy Run key to start application
      • Disables RegEdit via registry modification
      • Checks computer location settings
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:2424
      • C:\Windows\SysWOW64\s4827\winlogon.exe
        "C:\Windows\system32\s4827\winlogon.exe" ~Brontok~Is~The~Best~
        3⤵
        • Modifies WinLogon for persistence
        • Modifies visibility of file extensions in Explorer
        • Modifies visiblity of hidden/system files in Explorer
        • Adds policy Run key to start application
        • Disables RegEdit via registry modification
        • Checks computer location settings
        • Executes dropped EXE
        • Adds Run key to start application
        • Drops file in System32 directory
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1700
        • C:\Windows\SysWOW64\s4827\services.exe
          "C:\Windows\system32\s4827\services.exe" ~Brontok~Serv~
          4⤵
          • Modifies WinLogon for persistence
          • Modifies visibility of file extensions in Explorer
          • Modifies visiblity of hidden/system files in Explorer
          • Adds policy Run key to start application
          • Disables RegEdit via registry modification
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in System32 directory
          • Drops file in Windows directory
          PID:2432
        • C:\Windows\SysWOW64\s4827\m4623.exe
          "C:\Windows\system32\s4827\m4623.exe" ~Brontok~Back~Log~
          4⤵
          • Modifies WinLogon for persistence
          • Modifies visibility of file extensions in Explorer
          • Modifies visiblity of hidden/system files in Explorer
          • Adds policy Run key to start application
          • Disables RegEdit via registry modification
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in System32 directory
          • Drops file in Windows directory
          PID:4444
        • C:\Windows\SysWOW64\at.exe
          "C:\Windows\System32\at.exe" /delete /y
          4⤵
            PID:3212
          • C:\Windows\Ad10218\qm4623.exe
            "C:\Windows\Ad10218\qm4623.exe" ~Brontok~Back~Log~
            4⤵
            • Modifies WinLogon for persistence
            • Modifies visibility of file extensions in Explorer
            • Modifies visiblity of hidden/system files in Explorer
            • Adds policy Run key to start application
            • Disables RegEdit via registry modification
            • Executes dropped EXE
            • Adds Run key to start application
            • Drops file in System32 directory
            • Drops file in Windows directory
            PID:4312
          • C:\Windows\SysWOW64\s4827\lsass.exe
            "C:\Windows\system32\s4827\lsass.exe" ~Brontok~Network~
            4⤵
            • Modifies WinLogon for persistence
            • Modifies visibility of file extensions in Explorer
            • Modifies visiblity of hidden/system files in Explorer
            • Adds policy Run key to start application
            • Disables RegEdit via registry modification
            • Checks computer location settings
            • Executes dropped EXE
            • Adds Run key to start application
            • Enumerates connected drives
            • Drops file in System32 directory
            • Drops file in Windows directory
            • Suspicious use of WriteProcessMemory
            PID:3852
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /c net view /domain > "C:\Windows\system32\s4827\domlist.txt"
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:4676
              • C:\Windows\SysWOW64\net.exe
                net view /domain
                6⤵
                • Discovers systems in the same network
                PID:4840
          • C:\Windows\SysWOW64\s4827\csrss.exe
            "C:\Windows\system32\s4827\csrss.exe" ~Brontok~SpreadMail~
            4⤵
            • Modifies WinLogon for persistence
            • Modifies visibility of file extensions in Explorer
            • Modifies visiblity of hidden/system files in Explorer
            • Adds policy Run key to start application
            • Disables RegEdit via registry modification
            • Drops file in Drivers directory
            • Executes dropped EXE
            • Adds Run key to start application
            • Drops file in System32 directory
            • Drops file in Windows directory
            PID:1328
          • C:\Windows\SysWOW64\at.exe
            "C:\Windows\System32\at.exe" 17:08 /every:M,T,W,Th,F,S,Su "C:\Users\Admin\AppData\Local\jalak-93927015-bali.com"
            4⤵
              PID:1444
            • C:\Windows\SysWOW64\at.exe
              "C:\Windows\System32\at.exe" 11:03 /every:M,T,W,Th,F,S,Su "C:\Users\Admin\AppData\Local\jalak-93927015-bali.com"
              4⤵
                PID:4560

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Windows\SysWOW64\c_31602k.com

          Filesize

          4KB

          MD5

          9e53d7cd352d4b8b574ca07e3442c48c

          SHA1

          436e6d7c281544df5517c4e776dfd8ffb2c4ee74

          SHA256

          751c348d0d1e470fb2ae94cc90b1b92537115d3ba6c1a9176729864cad08808b

          SHA512

          20bf4593bd385afbd32b65b9197ea7647167b352ab37335e2d93f4522c78f641c1c91136a2e33179f98536ad645b7c3132aff5ed3c042b73247d4e6db3045efc

        • C:\Windows\SysWOW64\s4827\smss.exe

          Filesize

          53KB

          MD5

          6dde0ef221978abe0a4dc088dc5dde52

          SHA1

          cdbe09c9922f34c1f77d29abdf2e83c7704afef7

          SHA256

          f00e4480a92e46fa7a38dcd06c03ba54ddbe61b0edbe5ac303c0eed6453b0f41

          SHA512

          3e17623cb8efbf312f0e480136a27aeefb7d6e87f66c91269296a0b9a38c1f4e06e7019d87570f732524fb7961c8c29e374fc1ee6e404e67ceaf18dcfb3664e4

        • memory/1068-14-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1068-47-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1068-0-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1328-418-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-1133-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-1403-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-377-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-1263-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-1020-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-889-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-520-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-780-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-667-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/1700-579-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2424-166-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-599-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-1060-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-1165-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-378-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-668-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-1265-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-1440-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-917-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/2432-781-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/3852-419-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-817-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-1306-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-1443-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-566-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-920-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-671-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-420-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-603-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-1063-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-568-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4312-1170-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-672-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-1171-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-1064-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-921-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-818-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-1307-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-604-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-567-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB

        • memory/4444-421-0x0000000000400000-0x0000000000420040-memory.dmp

          Filesize

          128KB