General

  • Target
    avast_secure_browser_setup.exe
  • Size 6.8MB
  • Sample260808-ymrl4axzaz
  • SHA256 798e3802db8a96ec665a3edfdb3a4f14db6db6b5a168685cc16a7230d37e7739
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Targets

    • Target
      avast_secure_browser_setup.exe
    • Size 6.8MB
    • SHA256 798e3802db8a96ec665a3edfdb3a4f14db6db6b5a168685cc16a7230d37e7739
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    • Downloads MZ/PE file

    • Event Triggered Execution: Image File Execution Options Injection

    • Uses Session Manager for persistence

      Creates Session Manager registry key to run executable early in system boot.

    • Checks BIOS information in registry

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

    • Checks computer location settings

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

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    • 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

    • Checks for any installed AV software in registry

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Checks whether UAC is enabled

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Drops file in System32 directory

    • Target
      $PLUGINSDIR/AvastBrowserInstaller.exe
    • Size 11.1MB
    • SHA256 5638bd9add1dc2665e09890352d721fd983c2b280f16d2f95ae9b7a57395cc31
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    3/10
    • Target
      $PLUGINSDIR/AvastBrowserUpdateSetup.exe
    • Size 1.6MB
    • SHA256 2425183fa25e5a6e99d38a3a2f98ad74a51da09e3f33105bf88a1f363dfe9666
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    4/10
    • Target
      $PLUGINSDIR/sciterui.dll
    • Size 147KB
    • SHA256 923f9bca72d8b13beabea40b4d733088d5cad1047b4ac4b2699fa1e8b1379e41
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    1/10

MITRE ATT&CK Enterprise v16

Tasks