General

Malware Config

Extracted

Family

revengerat

Botnet

Guest

C2

0.tcp.ngrok.io:19521

Mutex

RV_MUTEX

Extracted

Family

darkcomet

Botnet

Guest1111

C2

193.242.166.48:1605

Mutex

DC_MUTEX-2QRLPN3

Attributes
  • InstallPath

    Windupdt\winupdate.exe

  • gencode

    Rb5l52XcV9no

  • install

    true

  • offline_keylogger

    false

  • password

    313131

  • persistence

    true

  • reg_key

    winupdater

rc4.plain

Targets

    • Chimera

      Ransomware which infects local and network files, often distributed via Dropbox links.

    • Chimera Ransomware Loader DLL

      Drops/unpacks executable file which resembles Chimera's Loader.dll.

    • Chimera family

    • Darkcomet

      DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

    • Darkcomet family

    • Modifies WinLogon for persistence

    • Njrat family

    • RevengeRAT

      Remote-access trojan with a wide range of capabilities.

    • Revengerat family

    • njRAT/Bladabindi

      Widely used RAT written in .NET.

    • Renames multiple (3245) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

    • RevengeRat Executable

    • Downloads MZ/PE file

    • Modifies Windows Firewall

    • Sets file to hidden

      Modifies file attributes to stop it showing in Explorer etc.

    • Drops startup file

    • Executes dropped EXE

    • Reads user/profile data of web browsers

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

    • Uses the VBS compiler for execution

    • Adds Run key to start application

    • Drops desktop.ini file(s)

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks