Overview

overview

8

Static

static

1

avast_free...ne.exe

windows7-x64

8

avast_free...ne.exe

windows10-2004-x64

8

Sharing

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General

  • Target

    avast_free_antivirus_setup_online.exe

  • Size

    256KB

  • Sample

    230331-y4zc9see2x

  • MD5

    47f173cbb0347b15573208f9a25200b2

  • SHA1

    805d9b978da2c1c825d942b83169d14646be3e44

  • SHA256

    8cecb52c489f92e8622b824fd01e0e7a25d029c4455ea6c6b1e2032a6285a3ad

  • SHA512

    d4a460adf093b72f39b5e32d6edd509840718ed2429f77dcf0e67a6af49b76fe61607b574f1feb54a0c29aff60f4dd5f6c7ae9f30a8c5786ec2859e335a19754

  • SSDEEP

    6144:TCfHrZae3GFqRQcMeh4WpywpjchNCPn9ebT6:TCfLZadcM24fRNiea

Score
8/10
bootkitdiscoverypersistence

Malware Config

Targets

    • Target

      avast_free_antivirus_setup_online.exe

    • Size

      256KB

    • MD5

      47f173cbb0347b15573208f9a25200b2

    • SHA1

      805d9b978da2c1c825d942b83169d14646be3e44

    • SHA256

      8cecb52c489f92e8622b824fd01e0e7a25d029c4455ea6c6b1e2032a6285a3ad

    • SHA512

      d4a460adf093b72f39b5e32d6edd509840718ed2429f77dcf0e67a6af49b76fe61607b574f1feb54a0c29aff60f4dd5f6c7ae9f30a8c5786ec2859e335a19754

    • SSDEEP

      6144:TCfHrZae3GFqRQcMeh4WpywpjchNCPn9ebT6:TCfLZadcM24fRNiea

    Score
    8/10
    bootkitpersistencediscovery

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Sets service image path in registry

      persistence

    • Executes dropped EXE

    • Loads dropped DLL

    • Registers COM server for autorun

      persistence

    • Adds Run key to start application

      persistence

    • 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.

      discovery

    • Writes to the Master Boot Record (MBR)

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

      bootkitpersistence

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

3
T1060

Bootkit

1
T1067

Privilege Escalation

Defense Evasion

Modify Registry

3
T1112

Install Root Certificate

1
T1130

Credential Access

Discovery

Security Software Discovery

1
T1063

Query Registry

4
T1012

Peripheral Device Discovery

1
T1120

System Information Discovery

2
T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Tasks