Analysis

  • max time kernel
    155s
  • max time network
    162s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    17-11-2023 10:42

General

  • Target

    a834e5719f48a4395e41112499245dd821007f623614de089947bbfdc7254734.exe

  • Size

    3.6MB

  • MD5

    ce7d60debc5ac0cc90aef9ebf8b8cc01

  • SHA1

    7bea480bd536850bd49e26865c907cf867b9e9d0

  • SHA256

    a834e5719f48a4395e41112499245dd821007f623614de089947bbfdc7254734

  • SHA512

    a22cc0d52c657edba11608adf31d1b722aee0bcdab7ecacd47dc62a53045dc37a276fe1c83dbb456d44d3614d93a9775037afc816e4846cc967ae0490c27aedb

  • SSDEEP

    49152:N5VY3ApdEjL7Jci2w/9MUvGsan4C3MAt6v+jnCVQ3kOsAWKD12u:3V16jLbAU

Malware Config

Extracted

Family

cobaltstrike

C2

http://59.42.194.18:1941/UJwG

Attributes
  • user_agent

    User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727)

Signatures

  • Cobaltstrike

    Detected malicious payload which is part of Cobaltstrike.

  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Office loads VBA resources, possible macro or embedded object present
  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: RenamesItself 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a834e5719f48a4395e41112499245dd821007f623614de089947bbfdc7254734.exe
    "C:\Users\Admin\AppData\Local\Temp\a834e5719f48a4395e41112499245dd821007f623614de089947bbfdc7254734.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious behavior: RenamesItself
    • Suspicious use of WriteProcessMemory
    PID:1928
    • C:\Windows\SysWOW64\cmd.exe
      cmd " /c " C:\Users\Admin\AppData\Local\Temp\国务院关于提高个人所得税有关专项附加扣除标准的通知.docx
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2420
      • 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\国务院关于提高个人所得税有关专项附加扣除标准的通知.docx"
        3⤵
        • Drops file in Windows directory
        • Modifies Internet Explorer settings
        • Modifies registry class
        • Suspicious behavior: AddClipboardFormatListener
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:892
        • C:\Windows\splwow64.exe
          C:\Windows\splwow64.exe 12288
          4⤵
            PID:3064
      • C:\Users\Public\notepd.exe
        C:\Users\Public\notepd.exe
        2⤵
        • Executes dropped EXE
        PID:1552

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\国务院关于提高个人所得税有关专项附加扣除标准的通知.docx

      Filesize

      12KB

      MD5

      e40adcd070295fa3e90734470639483f

      SHA1

      fb46fb5d0ec22cce1ef9b121849fbee33d86eff9

      SHA256

      b977c3bfe02ce8ebb4d8cd0f0c49ad330b5f663913f6fcd1d85c12def4b5331b

      SHA512

      5693f9f74bde3267e5b3ecd1eaca7d4d24db8203528d948eb669399192203d7471289ae81f3140e57372f88d9c7e97d79c9181e564030de9eb5bec9134b62bec

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

      Filesize

      20KB

      MD5

      b917417998438b869d00c965f8ce7085

      SHA1

      4f78938df11a80e1dbb5bdccfda949d7ae5e45fd

      SHA256

      ad75391e4fd6ef315ff4d277a93af864a268e0f21fa8341c718ceef20d09dd9f

      SHA512

      58990f8e3d1a908e46f156f7fd5eaae7eb9c2e047db09adaf23162338d1638f13071405e923bb698c4a9afaed77888efbf0887fdc4002c654406496c090cb32b

    • C:\Users\Admin\AppData\Roaming\Microsoft\UProof\ExcludeDictionaryEN0409.lex

      Filesize

      2B

      MD5

      f3b25701fe362ec84616a93a45ce9998

      SHA1

      d62636d8caec13f04e28442a0a6fa1afeb024bbb

      SHA256

      b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

      SHA512

      98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

    • C:\Users\Public\notepd.exe

      Filesize

      1.6MB

      MD5

      be26a7f28e1259e7a39c15a7312c3baf

      SHA1

      a3e0ce80c31fae5d0ac8e7e52954151415bbb906

      SHA256

      5ff4fad88f868dc2747db3df638787aed7209fd4ea04552f8c84ca5e92797be7

      SHA512

      2c7251d20d0c9c5e14f5fbe731100d1654005d004fa97bc790b1feb42d527b1e7299d1b71955cfe9d2c15ee841e6bae8cbbf18abf08f5c78f92e9e37bb656954

    • \Users\Public\notepd.exe

      Filesize

      1.6MB

      MD5

      be26a7f28e1259e7a39c15a7312c3baf

      SHA1

      a3e0ce80c31fae5d0ac8e7e52954151415bbb906

      SHA256

      5ff4fad88f868dc2747db3df638787aed7209fd4ea04552f8c84ca5e92797be7

      SHA512

      2c7251d20d0c9c5e14f5fbe731100d1654005d004fa97bc790b1feb42d527b1e7299d1b71955cfe9d2c15ee841e6bae8cbbf18abf08f5c78f92e9e37bb656954

    • \Users\Public\notepd.exe

      Filesize

      1.6MB

      MD5

      be26a7f28e1259e7a39c15a7312c3baf

      SHA1

      a3e0ce80c31fae5d0ac8e7e52954151415bbb906

      SHA256

      5ff4fad88f868dc2747db3df638787aed7209fd4ea04552f8c84ca5e92797be7

      SHA512

      2c7251d20d0c9c5e14f5fbe731100d1654005d004fa97bc790b1feb42d527b1e7299d1b71955cfe9d2c15ee841e6bae8cbbf18abf08f5c78f92e9e37bb656954

    • memory/892-33-0x000000002F271000-0x000000002F272000-memory.dmp

      Filesize

      4KB

    • memory/892-35-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/892-36-0x0000000071A5D000-0x0000000071A68000-memory.dmp

      Filesize

      44KB

    • memory/892-55-0x0000000071A5D000-0x0000000071A68000-memory.dmp

      Filesize

      44KB

    • memory/892-73-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1552-10-0x00000000007A0000-0x00000000007A1000-memory.dmp

      Filesize

      4KB