Overview

overview

10

Static

static

10

Client-built.exe

windows10-2004-x64

10

Client-built.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    Client-built.exe
  • Size 899KB
  • Sample260722-tdhwdagh47
  • SHA256 08686a1112d2c644eecf6c382279b77274b1376eda000b7acaca8ae67d4c7f0b
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
quasaroffice04adwaredefense_evasiondiscoveryexecutionpersistenceprivilege_escalationspywarestealertrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.5.1

Botnet

  • Office04

C2

  • 9wtcmv5xdj.localto.net:1337

Mutex

  • 5f4957e7-38d6-4c27-a9b5-ac5ff6564b08

Attributes
  • encryption_key

    525DDF3E6BA8BBAEFA28B7E45B804F5FEF1B894B

  • install_name

    Client.exe

  • key_salt

    5a23f8394640cb9e40658446a04c0bbae82dc93d0470e1b2a406a90fd2520382

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    svchost

  • subdirectory

    SubDir

Targets

    • Target
      Client-built.exe
    • Size 899KB
    • SHA256 08686a1112d2c644eecf6c382279b77274b1376eda000b7acaca8ae67d4c7f0b
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    adwareoffice04defense_evasiondiscoveryexecutionquasarpersistenceprivilege_escalationspywarestealertrojan

    • Family: Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Checks computer location settings

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

    • Executes dropped EXE

    • Reads user/profile data of web browsers

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

      spywarestealer
    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

Windows Command Shell

1
T1059.003

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Modify Registry

1
T1112

Credential Access

Credentials from Password Stores

1
T1555

Credentials from Web Browsers

1
T1555.003

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Browser Information Discovery

1
T1217

Query Registry

4
T1012

System Information Discovery

4
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

System Network Configuration Discovery

1
T1016

Wi-Fi Discovery

1
T1016.002

System Time Discovery

1
T1124

Lateral Movement

Collection

Data from Local System

1
T1005

Command and Control

Exfiltration

Impact

Tasks