Overview

overview

10

Static

static

10

Client-built.exe

windows11-21h2-x64

10

Sharing

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General

  • Target
    Client-built.exe
  • Size 1.6MB
  • Sample260619-rx617sh131
  • SHA256 4d01a1b028cb4fe685f28bbaebbf399e17fbaa5a14d178675623c113f71d45e7
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
quasaroffice04credential_accessdefense_evasiondiscoverypersistenceprivilege_escalationspywarestealertrojan

Malware Config

Extracted

Family

  • quasar

Version

  • 1.6.2

Botnet

  • Office04

C2

  • 193.8.215.36:14447

Mutex

  • c309e0cd-1863-44ff-9d03-abfdcd3f88a5

Attributes
  • encryption_key

    AE82780435B1CCEF85C04A1CA71F0D6403E04CAB

  • install_name

    Client.exe

  • key_salt

    5a23f8394640cb9e40658446a04c0bbae82dc93d0470e1b2a406a90fd2520382

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Pulsar Client Startup

  • subdirectory

    SubDir

Targets

    • Target
      Client-built.exe
    • Size 1.6MB
    • SHA256 4d01a1b028cb4fe685f28bbaebbf399e17fbaa5a14d178675623c113f71d45e7
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    office04credential_accessdefense_evasiondiscoveryquasarpersistenceprivilege_escalationspywarestealertrojan

    • Family: Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Uses browser remote debugging

      Can be used control the browser and steal sensitive information such as credentials and session cookies.

      credential_accessstealer

    • Reads user/profile data of web browsers

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

      spywarestealer
    behavioral1

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Modify Authentication Process

1
T1556

Privilege Escalation

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Defense Evasion

Modify Authentication Process

1
T1556

Credential Access

Credentials from Password Stores

1
T1555

Credentials from Web Browsers

1
T1555.003

Modify Authentication Process

1
T1556

Steal Web Session Cookie

1
T1539

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Browser Information Discovery

1
T1217

Query Registry

1
T1012

System Information Discovery

3
T1082

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