Analysis

  • max time kernel
    120s
  • max time network
    123s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    11/05/2021, 16:02

General

  • Target

    a5c463db805e356cb6e73e5676b397eab265e061c6797.exe

  • Size

    740KB

  • MD5

    e458dc2ba9e161ea08ff8bebea2a469e

  • SHA1

    33c3d82ad1a6ae6025f3c6d7230b7182da4b0765

  • SHA256

    a5c463db805e356cb6e73e5676b397eab265e061c6797e27b626b8b4aee892a3

  • SHA512

    f798ec39f39ecff88ed5092751e4500f4f7542e74d4b4c118b1dd85c390186d00b543aa9f26d6baf1317993bd7ee360177eb32b5c698d0356be3bbf1cb7d9eb1

Malware Config

Extracted

Family

cryptbot

C2

remdvz22.top

morjgs02.top

Attributes
  • payload_url

    http://sulsxq03.top/download.php?file=lv.exe

Signatures

  • CryptBot

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

  • CryptBot Payload 2 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Drops startup file 1 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 behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a5c463db805e356cb6e73e5676b397eab265e061c6797.exe
    "C:\Users\Admin\AppData\Local\Temp\a5c463db805e356cb6e73e5676b397eab265e061c6797.exe"
    1⤵
    • Checks processor information in registry
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:800
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c start "" "C:\Users\Admin\AppData\Local\Temp\XsFuvN.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3852
      • C:\Users\Admin\AppData\Local\Temp\XsFuvN.exe
        "C:\Users\Admin\AppData\Local\Temp\XsFuvN.exe"
        3⤵
        • Executes dropped EXE
        • Drops startup file
        • Suspicious use of WriteProcessMemory
        PID:1352
        • C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe
          "C:\Users\Admin\AppData\Roaming\Smart Clock\SmartClock.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: AddClipboardFormatListener
          PID:4088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\system32\cmd.exe" /c rd /s /q C:\Users\Admin\AppData\Local\Temp\PTabHtqkBXmsC & timeout 3 & del /f /q "C:\Users\Admin\AppData\Local\Temp\a5c463db805e356cb6e73e5676b397eab265e061c6797.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2104
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:908

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • memory/800-114-0x0000000002370000-0x0000000002451000-memory.dmp

          Filesize

          900KB

        • memory/800-115-0x0000000000400000-0x00000000004E5000-memory.dmp

          Filesize

          916KB

        • memory/1352-128-0x0000000001F60000-0x0000000001F86000-memory.dmp

          Filesize

          152KB

        • memory/1352-129-0x0000000000400000-0x000000000046E000-memory.dmp

          Filesize

          440KB

        • memory/4088-134-0x0000000000400000-0x000000000046E000-memory.dmp

          Filesize

          440KB