Overview

overview

6

Static

static

1

avast_secu...up.exe

windows10-2004-x64

6

avast_secu...up.exe

windows11-21h2-x64

6

$PLUGINSDI...er.exe

windows10-2004-x64

3

$PLUGINSDI...er.exe

windows11-21h2-x64

3

$PLUGINSDI...up.exe

windows10-2004-x64

4

$PLUGINSDI...up.exe

windows11-21h2-x64

4

$PLUGINSDI...ui.dll

windows10-2004-x64

1

$PLUGINSDI...ui.dll

windows11-21h2-x64

1

Analysis

  • max time kernel
    149s
  • max time network
    118s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    06/06/2026, 18:12

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General

  • Target
    avast_secure_browser_setup.exe
  • Size 6.8MB
  • Sample260606-wtk2sabv2s
  • SHA256 ef71f59d26c78e7d9a39e2554de20086f844132b23e21891e81c47c55dbd0d3f
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
6/10
bootkitdiscoverypersistencespywarestealer

Malware Config

Signatures

  • Checks for any installed AV software in registry 1 TTPs 1 IoCs
  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

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

    bootkitpersistence
  • Executes dropped EXE 1 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

    discovery
  • Enumerates physical storage devices 1 TTPs

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

  • Reads user/profile data of web browsers 3 TTPs

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

    spywarestealer
  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 20 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\avast_secure_browser_setup.exe
    "C:\Users\Admin\AppData\Local\Temp\avast_secure_browser_setup.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4824
    • C:\Users\Admin\AppData\Local\Temp\nsjDC86.tmp\AvastBrowserInstaller.exe
      "C:\Users\Admin\AppData\Local\Temp\nsjDC86.tmp\AvastBrowserInstaller.exe" "C:\Users\Admin\AppData\Local\Temp\avast_secure_browser_setup.exe"
      2⤵
      • Checks for any installed AV software in registry
      • Writes to the Master Boot Record (MBR)
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:4828

Network

        MITRE ATT&CK Enterprise v16

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        Downloads

        AvastBrowserInstaller.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nsjDC86.tmp\AvastBrowserInstaller.exe
        • Size 11.1MB
        • SHA256 65a1bf6f3657c05c6eaf4a3031038b61d58b4ba1007c46fa815585ff6b2f58c8
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        AvastBrowserUpdateSetup.exe
        • Path C:\Users\Admin\AppData\Local\Temp\nsjDC86.tmp\AvastBrowserUpdateSetup.exe
        • Size 1.6MB
        • SHA256 2425183fa25e5a6e99d38a3a2f98ad74a51da09e3f33105bf88a1f363dfe9666
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        sciterui.dll
        • Path C:\Users\Admin\AppData\Local\Temp\nsjDC86.tmp\sciterui.dll
        • Size 147KB
        • SHA256 923f9bca72d8b13beabea40b4d733088d5cad1047b4ac4b2699fa1e8b1379e41
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download