Overview

overview

8

Static

static

1

avast_free...ne.exe

windows10-2004-x64

8

avast_free...ne.exe

windows11-21h2-x64

6

Sharing

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General

  • Target
    avast_free_antivirus_setup_online.exe
  • Size 245KB
  • Sample260426-w2dmnset8z
  • SHA256 263e7acd12bc66cfc6d503b54dae71067872512af7b1f64d49f1e65943f0a455
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
8/10
bootkitdefense_evasiondiscoverypersistenceprivilege_escalation

Malware Config

Targets

    • Target
      avast_free_antivirus_setup_online.exe
    • Size 245KB
    • SHA256 263e7acd12bc66cfc6d503b54dae71067872512af7b1f64d49f1e65943f0a455
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    bootkitdefense_evasiondiscoverypersistenceprivilege_escalation

    • Uses Session Manager for persistence

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

      persistence

    • Checks for any installed AV software in registry

    • Downloads MZ/PE file

    • 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 Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Privilege Escalation

Access Token Manipulation

1
T1134

Create Process with Token

1
T1134.002

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Access Token Manipulation

1
T1134

Create Process with Token

1
T1134.002

Modify Registry

1
T1112

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Credential Access

Discovery

Query Registry

2
T1012

Software Discovery

1
T1518

Security Software Discovery

1
T1518.001

System Information Discovery

1
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

System Network Configuration Discovery

1
T1016

Internet Connection Discovery

1
T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks