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Analysis

  • max time kernel
    90s
  • max time network
    128s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/10/2022, 15:52

General

  • Target

    documents.lnk

  • Size

    995B

  • MD5

    657e82d44e6e48dc6cb9822bc074e37b

  • SHA1

    2a8f2a505b1fe7dec3550cc5b2d1969a7aec91a2

  • SHA256

    9d3b6e8b7bd58f0ff72fb9188e4aefdd988fa86d81043f2850f335bea004b182

  • SHA512

    16759c899c1c08688885ba4c9b5d8b3a43583b5d2bd8ce3824a0de422cc34dfe5385241e058d7f1862b4a4de0f5ed1727b1a41e0d0e00b87fd7b444d6924ce9a

Malware Config

Extracted

Family

bumblebee

Botnet

2510

C2

69.46.15.158:443

135.125.241.35:443

172.86.120.141:443

rc4.plain

Signatures

  • BumbleBee

    BumbleBee is a webshell malware written in C++.

  • Enumerates VirtualBox registry keys 2 TTPs 5 IoCs
  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 3 IoCs
  • Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
  • Checks BIOS information in registry 2 TTPs 3 IoCs

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

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Identifies Wine through registry keys 2 TTPs 1 IoCs

    Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    cmd /c C:\Users\Admin\AppData\Local\Temp\documents.lnk
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1208
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c OUBcVbISpNCsLG.bat
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1660
      • C:\Windows\system32\rundll32.exe
        rundll32 lXNqexIxTwBWAS.dll,newrequest
        3⤵
        • Enumerates VirtualBox registry keys
        • Identifies VirtualBox via ACPI registry values (likely anti-VM)
        • Looks for VirtualBox Guest Additions in registry
        • Checks BIOS information in registry
        • Identifies Wine through registry keys
        • Suspicious use of NtCreateThreadExHideFromDebugger
        • Suspicious behavior: EnumeratesProcesses
        PID:4604

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/4604-134-0x000002F5EAEC0000-0x000002F5EB013000-memory.dmp

    Filesize

    1.3MB