Extracted

• • Target
    Nuker.exe
  • Size 16.2MB
  • SHA256 1865097f4409bbececdc16eb9a954277e111c488a0bcab48cc7994259a87d3f6
  • MD5 158e38329471b65fbe962bb0f751c057
  • SHA1 bce3f3ac95b1f02fd3f815ab54ebcec3d913ae93
  • SHA512 4188c30c9234dcd76d841da6cfca36ceb4a1405b2a642b4ef915668aa74ded705346b8645543ddd9af9f816e21af611836b9a6497dce9c320eba5a93d6bcad18
  • SSDEEP 393216:TYWhpy9SVoR3jpYH7MmNdlpm69L54CkdS6UOfLlQf:bwSVoRzpYHom7loE54CKxU2Lk
  • TLSH
    T1A707337AC000BD4BCE5F1A70DEBF7EA5F2211A5EB05BA5E00151B5872FAB58AC503673
  • MD5 SHA1 SHA512 SSDEEP TLSH

  Score

  10^/10

  executionumbralstealerdefense_evasiondiscoveryspyware

  • Detects Umbral payload

  • Family: Umbral

    Umbral stealer is an open-source modular stealer written in C#.

    stealerumbral

  • Command and Scripting Interpreter: PowerShell

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

    execution

  • Disables one or more Microsoft Defender components

    Uses the Powershell Set-MpPreference cmdlet to disable one or more Microsoft Defender components.

    defense_evasion

  • Checks computer location settings

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

  • Disables automatic submission of suspicious files to Microsoft by Windows Defender

    Uses the Powershell Set-MpPreference cmdlet to prevent Windows Defender from automatically sending files to Microsoft for analysis.

    defense_evasion

  • 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.

    spywarestealer

  • Contacts third-party web service commonly abused for C2

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Looks up external IP address via web service

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

    discovery
  behavioral1behavioral2