Analysis

  • max time kernel
    39s
  • max time network
    42s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    14/05/2021, 07:02

General

  • Target

    2da5f09b58088a8e3a3ffa45d1f5f5d9.exe

  • Size

    771KB

  • MD5

    2da5f09b58088a8e3a3ffa45d1f5f5d9

  • SHA1

    3086e2a39dd09b0c8f2a9e9e8a471555f417e0e4

  • SHA256

    3fbbe701191020522bf1488b4015d325f38c46acd07456de0cd8f4035f1ed170

  • SHA512

    0cf11a5556069e78aac01f4281507a71186d997790b902e0378342930db44bc9403c422ab0ae73634b695cef3a164baca0b45dbea7c95202072ea314b94704b6

Malware Config

Extracted

Family

cryptbot

C2

remkoy32.top

morkqz03.top

Attributes
  • payload_url

    http://sulejx04.top/download.php?file=lv.exe

Signatures

  • CryptBot

    A C++ stealer distributed widely in bundle with other software.

  • CryptBot Payload 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2da5f09b58088a8e3a3ffa45d1f5f5d9.exe
    "C:\Users\Admin\AppData\Local\Temp\2da5f09b58088a8e3a3ffa45d1f5f5d9.exe"
    1⤵
    • Checks processor information in registry
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\HkMdXqQiCgEXj & timeout 3 & del /f /q "C:\Users\Admin\AppData\Local\Temp\2da5f09b58088a8e3a3ffa45d1f5f5d9.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:652
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1268

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • memory/856-114-0x0000000002650000-0x0000000002731000-memory.dmp

          Filesize

          900KB

        • memory/856-115-0x0000000000400000-0x00000000008B9000-memory.dmp

          Filesize

          4.7MB