Overview

overview

10

Static

static

3

2379cbf1b5...bb.exe

windows7-x64

10

2379cbf1b5...bb.exe

windows10-2004-x64

7

Sharing

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General

  • Target

    2379cbf1b539be7380bed6b1c5e1d29c77acc795d291fa2a687819d48df930bb

  • Size

    3.2MB

  • Sample

    240527-ylvx5ahb33

  • MD5

    6c16807e4417e60366cde4515d148ab3

  • SHA1

    b8212729ae453b48531c5331cfdaea3aa213cf85

  • SHA256

    2379cbf1b539be7380bed6b1c5e1d29c77acc795d291fa2a687819d48df930bb

  • SHA512

    eb448d72c2d7d74cae67cac46ebc0262e50113b40164d0c9837e4e0d481c23038f85a414dd92561fdbe5958ecdbaa86e8cdd921cc1cc2571eb96f9dd76cc2efe

  • SSDEEP

    49152:6oHBs26nkjh/a3LlwLkl6cV0ymGIj5y60K9F8AA/qDTvyNUjqwZjAN+68OxcIzQW:9B6Wh/9L3clIVy6RwA29NGoN+3OWIzQ

Score
10/10
quasaroffice04executionspywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

1`:4782

Mutex

af2aa588-6605-4638-8da1-ae434f48b4a8

Attributes
  • encryption_key

    45ADA9B733F36F800D08E295E8F812611F35D087

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Targets

    • Target

      2379cbf1b539be7380bed6b1c5e1d29c77acc795d291fa2a687819d48df930bb

    • Size

      3.2MB

    • MD5

      6c16807e4417e60366cde4515d148ab3

    • SHA1

      b8212729ae453b48531c5331cfdaea3aa213cf85

    • SHA256

      2379cbf1b539be7380bed6b1c5e1d29c77acc795d291fa2a687819d48df930bb

    • SHA512

      eb448d72c2d7d74cae67cac46ebc0262e50113b40164d0c9837e4e0d481c23038f85a414dd92561fdbe5958ecdbaa86e8cdd921cc1cc2571eb96f9dd76cc2efe

    • SSDEEP

      49152:6oHBs26nkjh/a3LlwLkl6cV0ymGIj5y60K9F8AA/qDTvyNUjqwZjAN+68OxcIzQW:9B6Wh/9L3clIVy6RwA29NGoN+3OWIzQ

    Score
    10/10
    quasaroffice04executionspywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Detects Windows executables referencing non-Windows User-Agents

    • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

    • Detects executables containing common artifacts observed in infostealers

    • Checks computer location settings

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

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to get system information.

      execution

    • Suspicious use of SetThreadContext

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Persistence

Scheduled Task/Job

1
T1053

Privilege Escalation

Scheduled Task/Job

1
T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Remote System Discovery

1
T1018

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Tasks