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 3.1MB
  • Sample261114-lcmh6sft4v
  • SHA256 6423543c82651a7e9c28690274fd3b42f04f06ed688131cf9e0e93f63a30205a
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
quasaroffice04adwarediscoveryexecutionpersistencespywarestealertrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.4.1

Botnet

  • Office04

C2

  • Valru-53692.portmap.host:53692

Mutex

  • 5a79026a-4032-4dea-b3e7-fd014febb39c

Attributes
  • encryption_key

    23988EACE66F540BD7F90DEB1D4A041E0244A75C

  • install_name

    windowsphotos.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    WindowsClient

  • subdirectory

    Windows Photos

Targets

    • Target
      Client-built.exe
    • Size 3.1MB
    • SHA256 6423543c82651a7e9c28690274fd3b42f04f06ed688131cf9e0e93f63a30205a
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    office04discoveryexecutionquasarpersistencespywaretrojanadwarestealer

    • 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

    • Loads dropped DLL

    • Reads WinSCP keys stored on the system

      Tries to access WinSCP stored sessions.

      spywarestealer

    • 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

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

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

2
T1552

Credentials In Files

1
T1552.001

Credentials in Registry

1
T1552.002

Discovery

Browser Information Discovery

1
T1217

Query Registry

3
T1012

Remote System Discovery

1
T1018

System Information Discovery

3
T1082

System Network Configuration Discovery

2
T1016

Internet Connection Discovery

1
T1016.001

System Time Discovery

1
T1124

Lateral Movement

Collection

Data from Local System

2
T1005

Command and Control

Exfiltration

Impact

Tasks