Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    06-06-2024 15:27

General

  • Target

    56b4ddf6c247124f9bc633b06b169a84.rtf

  • Size

    35KB

  • MD5

    56b4ddf6c247124f9bc633b06b169a84

  • SHA1

    f6d0dfca950ccd1fcb92ed511afba92db7edc843

  • SHA256

    67ad0f57895b9963fff217941c49d4eb97023d65fd5b3d36ab936c24fa35a6f0

  • SHA512

    6b9e14c704e944b576091f0339e874ed679eeb6d2eba55bb65826fa66d7cb0856d20e1a99cb3cb40599b1065586a138aacf64617490c1c7a237e67ed61b980a3

  • SSDEEP

    384:hWpJrekkBQCwF1YiQwB622Kfc51AD1BMulQGcCAnYuw:hWvSQ3F1YiQwMZFsAulQQAw

Malware Config

Extracted

Family

purecrypter

C2

https://www1.militarydefensenow.com/Stay/Vdopcuygit.vdf

Signatures

  • PureCrypter

    PureCrypter is a .NET malware loader first seen in early 2021.

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Drops file in Windows directory 1 IoCs
  • Office loads VBA resources, possible macro or embedded object present
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\56b4ddf6c247124f9bc633b06b169a84.rtf"
    1⤵
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2168
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:3000
    • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
      "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
      1⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Launches Equation Editor
      • Suspicious use of WriteProcessMemory
      PID:2708
      • C:\Users\Admin\AppData\Roaming\igcc.exe
        "C:\Users\Admin\AppData\Roaming\igcc.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2904

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\Microsoft\Templates\Normal.dotm

      Filesize

      20KB

      MD5

      270a8456600906b5151609fbf9ab42a2

      SHA1

      a566c122568db1d37ea3a512f4b17bb59b47b423

      SHA256

      d95c65d81b00242aef348e7494f6eb5892fc3dc1e4ac0f46bb713d4c17b56f5b

      SHA512

      1280e51b68fe5b1a65c3d05adbc09c478fe28ab397d7a12d6aa99ffea173ecd6dab928e16530fe7705448f2abe52e232f128c7088d64349f00fda759ee2dc57d

    • C:\Users\Admin\AppData\Roaming\igcc.exe

      Filesize

      7KB

      MD5

      e0354350b177887076f4c89567e0af8d

      SHA1

      999fc3514c83f5b3bfaf899b656a194f7f60ed05

      SHA256

      584c91693287a0d6c66f27a8c0f1841aad3368bc48b9d36b1088548f9f370032

      SHA512

      5972d529569ad3aecd8a02de1b2150a3901e2fe09aa5223956d4fd9f77ec9acd308d938c5748b8e38b6090484d0ec6f288f2295f67a6fcc12b0dc770620600fd

    • memory/2168-0-0x000000002FB51000-0x000000002FB52000-memory.dmp

      Filesize

      4KB

    • memory/2168-1-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/2168-2-0x0000000070E1D000-0x0000000070E28000-memory.dmp

      Filesize

      44KB

    • memory/2168-22-0x0000000070E1D000-0x0000000070E28000-memory.dmp

      Filesize

      44KB

    • memory/2168-40-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/2904-15-0x00000000008F0000-0x00000000008F8000-memory.dmp

      Filesize

      32KB