Analysis

  • max time kernel
    144s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    07-04-2024 23:11

General

  • Target

    8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe

  • Size

    424KB

  • MD5

    adde7a82f57387410210b34ebce305ca

  • SHA1

    416e571e09e4a713f5b8ea33a5b64da9990e1a17

  • SHA256

    8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1

  • SHA512

    9aac8f21198c1e838cf4a6b69ff17f3b714ab72fa452ff001e02e5546a3d9cf68bc4848a2a59e7e7effb88f522aab82767d0740b6359bbf7bf927ef4e31968b2

  • SSDEEP

    3072:nQC+GXgmYA/npA+fkBEcBoUTqp8YVE83jy11BGWjyLmar5FCO3ztKSwni9JCa2i:nQqgmYA/npAJBBo4q2YXAyL1L3BYq

Malware Config

Signatures

  • Detects executables containing base64 encoded User Agent 3 IoCs
  • UPX dump on OEP (original entry point) 8 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 7 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • UPX packed file 4 IoCs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

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

  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in Program Files directory 4 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe
    "C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe"
    1⤵
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2960
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\asamj.exe "C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:2044
      • C:\Windows\SysWOW64\PING.EXE
        ping 127.0.0.1 -n 2
        3⤵
        • Runs ping.exe
        PID:1056
      • C:\Users\Admin\AppData\Local\Temp\asamj.exe
        C:\Users\Admin\AppData\Local\Temp\\asamj.exe "C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe"
        3⤵
        • Deletes itself
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:2620
        • \??\c:\Program Files\xwevo\rzuwmuog.exe
          "c:\Program Files\xwevo\rzuwmuog.exe" "c:\Program Files\xwevo\rzuwmuog.dll",Compliance C:\Users\Admin\AppData\Local\Temp\asamj.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Adds Run key to start application
          • Enumerates connected drives
          • Writes to the Master Boot Record (MBR)
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2540

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\asamj.exe

    Filesize

    424KB

    MD5

    46801bc54a7269e17f772498e9c4064c

    SHA1

    e276be41e53f4d45fc67583cc0e374990892602b

    SHA256

    50327d800411ec6d8b0d1eba8fdadafff70623d36c19ac9977b2e3da77210fe7

    SHA512

    e623816353c79b42e0db66b0f3611dc1d858c7e904c6c1c71969e27c32667f47889098d8fdbb6e327dcab2fea36d6635d68d829ddf32cfc7ea48a436fd68f1b9

  • \??\c:\Program Files\xwevo\rzuwmuog.dll

    Filesize

    141KB

    MD5

    b3aaa16bffc7dfbc95c5fc04daac53af

    SHA1

    50c2b94ad4b9ee5c0c8b9994f2388f1efec0fc81

    SHA256

    e9fa5991fd0b30a8eb468b364926c3c3f73b20eca53b0b0a6870b938bed596e3

    SHA512

    29ff308db09b33c1398c19d1f92fde491c160c5d10ecee22162f3013718cec494915fd61a0414b723c4e830aec5b6d0a3d09809a546fe534bf729e9437f5a9a5

  • \Program Files\xwevo\rzuwmuog.exe

    Filesize

    43KB

    MD5

    51138beea3e2c21ec44d0932c71762a8

    SHA1

    8939cf35447b22dd2c6e6f443446acc1bf986d58

    SHA256

    5ad3c37e6f2b9db3ee8b5aeedc474645de90c66e3d95f8620c48102f1eba4124

    SHA512

    794f30fe452117ff2a26dc9d7086aaf82b639c2632ac2e381a81f5239caaec7c96922ba5d2d90bfd8d74f0a6cd4f79fbda63e14c6b779e5cf6834c13e4e45e7d

  • memory/2044-5-0x0000000000290000-0x00000000002F9000-memory.dmp

    Filesize

    420KB

  • memory/2540-21-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2540-22-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2540-23-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2540-24-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2540-28-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2540-36-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2620-13-0x0000000000400000-0x0000000000469000-memory.dmp

    Filesize

    420KB

  • memory/2960-0-0x0000000000400000-0x0000000000469000-memory.dmp

    Filesize

    420KB

  • memory/2960-2-0x0000000000400000-0x0000000000469000-memory.dmp

    Filesize

    420KB