Analysis

  • max time kernel
    138s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/02/2024, 17:52

General

  • Target

    8fc7c1c53bb2b95576968a2bd3086b12.dll

  • Size

    110KB

  • MD5

    8fc7c1c53bb2b95576968a2bd3086b12

  • SHA1

    46446c12d36457da232b495cc9c3a8596d4efad1

  • SHA256

    a9b89e001fe382a51fc329470dde3cbc463c42386f53018054fb79710e9a333f

  • SHA512

    efac4111b9582e14449c4a5284225300ad22c587a8db25652225dfba703f0a25cd0b282c9db03624e063336cfff36c662f6240d560ad912ab49077fda1ca2f18

  • SSDEEP

    3072:FOIjkBipGSfYurYY1NDM7QnXFlHHdn5X07g:Mmk4xf7YY1NA7G5X0

Malware Config

Signatures

  • Modifies AppInit DLL entries 2 TTPs
  • Loads dropped DLL 1 IoCs
  • UPX packed file 8 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Installs/modifies Browser Helper Object 2 TTPs 4 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Drops file in System32 directory 2 IoCs
  • Modifies registry class 23 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\8fc7c1c53bb2b95576968a2bd3086b12.dll,#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:64
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\8fc7c1c53bb2b95576968a2bd3086b12.dll,#1
      2⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:4428
      • C:\Windows\SysWOW64\rundll32.exe
        rundll32.exe "C:\Windows\system32\asumzu.dll",i
        3⤵
        • Loads dropped DLL
        • Installs/modifies Browser Helper Object
        • Modifies registry class
        PID:228

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Windows\SysWOW64\asumzu.dll

          Filesize

          110KB

          MD5

          8fc7c1c53bb2b95576968a2bd3086b12

          SHA1

          46446c12d36457da232b495cc9c3a8596d4efad1

          SHA256

          a9b89e001fe382a51fc329470dde3cbc463c42386f53018054fb79710e9a333f

          SHA512

          efac4111b9582e14449c4a5284225300ad22c587a8db25652225dfba703f0a25cd0b282c9db03624e063336cfff36c662f6240d560ad912ab49077fda1ca2f18

        • memory/228-10-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/228-13-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/228-14-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/228-15-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/4428-0-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/4428-1-0x0000000000A80000-0x0000000000A99000-memory.dmp

          Filesize

          100KB

        • memory/4428-2-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/4428-3-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/4428-4-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/4428-5-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB

        • memory/4428-8-0x0000000010000000-0x000000001003F000-memory.dmp

          Filesize

          252KB