General

  • Target

    RuntimeBroker.exe

  • Size

    346KB

  • Sample

    240922-wjvs8ssepj

  • MD5

    6a983258dfa7b270cc0938e4c453f66a

  • SHA1

    21cb0158a55a859552fbfe442b7e7ca04c3dd77f

  • SHA256

    2b80a0860ed3b8e262f242f251839d513808829fc3e209b93d2048c272ccc205

  • SHA512

    7273d35af4e4c590566c9d514a26a24aa71696a94aab0a0bfc30820d6a6e9918044cd0df11c20b9b983b3b30edcfecc76a6e9670bdbb8ab7a7ed48c9d405fef5

  • SSDEEP

    6144:q/cLTw+cOiFUk6Pv6U9yy/J6cIiPx166FpQoO/KzFHT809ii6VfNtvAeB9:q0LdcOiFhXKU6/3zFA09iD1tIeB9

Malware Config

Extracted

Family

xworm

C2

expected-schema.gl.at.ply.gg:2980

Attributes
  • Install_directory

    %Userprofile%

  • install_file

    USB.exe

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1287360783734411274/Muly1yjywcFg321yTLGVUf6Ilh44xbfhxhT17VnDw6_iOfAw6PaTOvV1EsNLG7xaTeEl

Targets

    • Target

      RuntimeBroker.exe

    • Size

      346KB

    • MD5

      6a983258dfa7b270cc0938e4c453f66a

    • SHA1

      21cb0158a55a859552fbfe442b7e7ca04c3dd77f

    • SHA256

      2b80a0860ed3b8e262f242f251839d513808829fc3e209b93d2048c272ccc205

    • SHA512

      7273d35af4e4c590566c9d514a26a24aa71696a94aab0a0bfc30820d6a6e9918044cd0df11c20b9b983b3b30edcfecc76a6e9670bdbb8ab7a7ed48c9d405fef5

    • SSDEEP

      6144:q/cLTw+cOiFUk6Pv6U9yy/J6cIiPx166FpQoO/KzFHT809ii6VfNtvAeB9:q0LdcOiFhXKU6/3zFA09iD1tIeB9

    • Detect Umbral payload

    • Detect Xworm Payload

    • Umbral

      Umbral stealer is an opensource moduler stealer written in C#.

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Credentials from Password Stores: Credentials from Web Browsers

      Malicious Access or copy of Web Browser Credential store.

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Drops file in Drivers directory

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

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

    • Adds Run key to start application

    • 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.

MITRE ATT&CK Enterprise v15

Tasks