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Analysis

  • max time kernel
    150s
  • max time network
    125s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    04/03/2024, 14:05

General

  • Target

    b250c62b3f1da424611acaf3ab5621ce.exe

  • Size

    11KB

  • MD5

    b250c62b3f1da424611acaf3ab5621ce

  • SHA1

    a43ebdf943903fd5ac8d9cf890239218e6b5ce86

  • SHA256

    4d4648899888a3eab3c24681b9478ec172d1605a2a4d8d7a1c6e939b4739e8eb

  • SHA512

    5d42c443102f3d8bcb793d591a6dca79d045897ba275aa27f4733a767f534192c847cda480a99011888f9e32bdbad26650d4534a71bf765e18860b1b35e1ffcf

  • SSDEEP

    192:0aww1AUaE0Pmr6iZTK+jZWPFfn6Kv1e1Box18KkNLPS7bg:JAK0PmOiZTZItnf1UB6GKkNL6Pg

Score
8/10

Malware Config

Signatures

  • Modifies AppInit DLL entries 2 TTPs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • UPX packed file 5 IoCs

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

  • Drops file in System32 directory 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b250c62b3f1da424611acaf3ab5621ce.exe
    "C:\Users\Admin\AppData\Local\Temp\b250c62b3f1da424611acaf3ab5621ce.exe"
    1⤵
    • Loads dropped DLL
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2240
    • C:\Windows\SysWOW64\zfashlk.exe
      C:\Windows\system32\zfashlk.exe ˜‰
      2⤵
      • Executes dropped EXE
      PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c C:\Users\Admin\AppData\Local\Temp\b250c62b3f1da424611acaf3ab5621ce.exe.bat
      2⤵
      • Deletes itself
      PID:2024

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\b250c62b3f1da424611acaf3ab5621ce.exe.bat

    Filesize

    182B

    MD5

    4abb5163230be467435a2827f3b68eb8

    SHA1

    5d2019d79979f71474b25f0aecae903a7d73b2ce

    SHA256

    284679f68ed1de52106de7ed96dfe033ea1132f2873ed5a18fc9f5a72b3e21b7

    SHA512

    bd62daa58d797ce87a255e931dec507a4c583c5693f679703d932666ff266e5f0c4d8ed16e8d1a309a2d3f2f29debe30dc32589409ab9dfa7cf6f8cdcd49e377

  • \Windows\SysWOW64\zfashlk.exe

    Filesize

    11KB

    MD5

    b250c62b3f1da424611acaf3ab5621ce

    SHA1

    a43ebdf943903fd5ac8d9cf890239218e6b5ce86

    SHA256

    4d4648899888a3eab3c24681b9478ec172d1605a2a4d8d7a1c6e939b4739e8eb

    SHA512

    5d42c443102f3d8bcb793d591a6dca79d045897ba275aa27f4733a767f534192c847cda480a99011888f9e32bdbad26650d4534a71bf765e18860b1b35e1ffcf

  • memory/2040-12-0x0000000000400000-0x000000000040E000-memory.dmp

    Filesize

    56KB

  • memory/2240-0-0x0000000000400000-0x000000000040E000-memory.dmp

    Filesize

    56KB

  • memory/2240-4-0x0000000000240000-0x000000000024E000-memory.dmp

    Filesize

    56KB

  • memory/2240-10-0x0000000000240000-0x000000000024E000-memory.dmp

    Filesize

    56KB

  • memory/2240-13-0x0000000000400000-0x000000000040E000-memory.dmp

    Filesize

    56KB

  • memory/2240-16-0x0000000000240000-0x000000000024E000-memory.dmp

    Filesize

    56KB