Analysis

  • max time kernel
    123s
  • max time network
    142s
  • platform
    windows10_x64
  • resource
    win10-en-20211208
  • submitted
    15/01/2022, 11:25

General

  • Target

    f323e2e20fc2f1d9d5afe645acfb33670f4fc8be2d472dfc5d1151b723321004.exe

  • Size

    316KB

  • MD5

    f311b9f8b7b18430f985d40b156dfd07

  • SHA1

    5ebeddb6a903f9d51f840858827ebc1f21fee122

  • SHA256

    f323e2e20fc2f1d9d5afe645acfb33670f4fc8be2d472dfc5d1151b723321004

  • SHA512

    bb721a5aa14ac3e4c5d3b7fd16d40c1d795bf8b2ca103c47a1b95c6f6accb460b12a5580f54370e6af3ff03e2ba1ad2837c64b0ca5aad720d67e55899fff705f

Malware Config

Extracted

Family

arkei

Botnet

Default

C2

http://file-file-host4.com/tratata.php

Signatures

  • Arkei

    Arkei is an infostealer written in C++.

  • Arkei Stealer Payload 2 IoCs
  • Downloads MZ/PE file
  • Loads dropped DLL 3 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 WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f323e2e20fc2f1d9d5afe645acfb33670f4fc8be2d472dfc5d1151b723321004.exe
    "C:\Users\Admin\AppData\Local\Temp\f323e2e20fc2f1d9d5afe645acfb33670f4fc8be2d472dfc5d1151b723321004.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious use of WriteProcessMemory
    PID:3716
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\f323e2e20fc2f1d9d5afe645acfb33670f4fc8be2d472dfc5d1151b723321004.exe" & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3568
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 5
        3⤵
        • Delays execution with timeout.exe
        PID:3784

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • memory/3716-115-0x00000000007BA000-0x00000000007CB000-memory.dmp

          Filesize

          68KB

        • memory/3716-116-0x0000000000640000-0x000000000065C000-memory.dmp

          Filesize

          112KB

        • memory/3716-117-0x0000000000400000-0x000000000055F000-memory.dmp

          Filesize

          1.4MB