Analysis

  • max time kernel
    122s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    15/01/2022, 08:30

General

  • Target

    bfa2ac832261df46640df025737b8c4a.exe

  • Size

    316KB

  • MD5

    bfa2ac832261df46640df025737b8c4a

  • SHA1

    d7922ef0cef7cc4f7ce9df47ba4de6c9822f14a9

  • SHA256

    81bc6e0cf586a808ef3ee9c5ace20622f414853a8606007357104c39f5fa5693

  • SHA512

    097cd3a632d90ecc95531c467b5460aa48d397887c17838ad17a53b7a1162cf3b78c45e978a030d637aef98fcf50444baf4fbef35c8501f8b6e5885b1f50bea9

Malware Config

Extracted

Family

arkei

Botnet

Default

C2

http://209.209.115.111/SYiQ6N1zUJ.php

Signatures

  • Arkei

    Arkei is an infostealer written in C++.

  • Arkei Stealer Payload 2 IoCs
  • Downloads MZ/PE file
  • Deletes itself 1 IoCs
  • Loads dropped DLL 5 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 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bfa2ac832261df46640df025737b8c4a.exe
    "C:\Users\Admin\AppData\Local\Temp\bfa2ac832261df46640df025737b8c4a.exe"
    1⤵
    • Loads dropped DLL
    • Checks processor information in registry
    • Suspicious use of WriteProcessMemory
    PID:1368
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\bfa2ac832261df46640df025737b8c4a.exe" & exit
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1832
      • C:\Windows\SysWOW64\timeout.exe
        timeout /t 5
        3⤵
        • Delays execution with timeout.exe
        PID:1768

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • memory/1368-55-0x000000000067B000-0x000000000068C000-memory.dmp

          Filesize

          68KB

        • memory/1368-57-0x0000000000400000-0x000000000055F000-memory.dmp

          Filesize

          1.4MB

        • memory/1368-56-0x0000000000220000-0x000000000023C000-memory.dmp

          Filesize

          112KB

        • memory/1368-58-0x0000000076371000-0x0000000076373000-memory.dmp

          Filesize

          8KB