Overview

overview

10

Static

static

3

99862073a5...b1.exe

windows7-x64

10

99862073a5...b1.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    99862073a5f3df00516a49e3b78057b1

  • Size

    635KB

  • Sample

    240213-qlkhdsca79

  • MD5

    99862073a5f3df00516a49e3b78057b1

  • SHA1

    46ac6d3ec2cb7d90d946a1470b5dff98eecee011

  • SHA256

    bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2

  • SHA512

    d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629

  • SSDEEP

    12288:Z+ifBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs+8s7b:csBxrd4lA7OvR/fqKoqsxsvoyFtbsqsK

Score
10/10
quasarvenomratwindows firewallevasionpersistenceratrootkitspywarestealertrojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows firewall

C2

23.105.131.187:7812

Mutex

VNM_MUTEX_zGeT5SjdI1pYgFyiav

Attributes
  • encryption_key

    3kpwI2tkVNrXY2Mm5wlR

  • install_name

    Windows Security.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    Windows Firewall Updates

Targets

    • Target

      99862073a5f3df00516a49e3b78057b1

    • Size

      635KB

    • MD5

      99862073a5f3df00516a49e3b78057b1

    • SHA1

      46ac6d3ec2cb7d90d946a1470b5dff98eecee011

    • SHA256

      bb1956f934dfbebe914a54e3445b5fbafac60e2672794a5e14ed4d1999d5aed2

    • SHA512

      d0d248502db680f17ed2e8d750d809796320c41395284df0df9967fac852f6b39a05df33f5054cc8e45ba116c61eb2c112e3038a26b3fada34056e36f1400629

    • SSDEEP

      12288:Z+ifBbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0Rqs+8s7b:csBxrd4lA7OvR/fqKoqsxsvoyFtbsqsK

    Score
    10/10
    quasarvenomratwindows firewallevasionpersistenceratrootkitspywarestealertrojan

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Modifies Windows Defender Real-time Protection settings

      evasiontrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • VenomRAT

      VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

      ratrootkitstealervenomrat

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Windows security modification

      evasiontrojan

    • Adds Run key to start application

      persistence

    • Looks up external IP address via web service

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

    • Suspicious use of SetThreadContext

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1
T1053

Persistence

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Scheduled Task/Job

1
T1053

Privilege Escalation

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

3
T1112

Impair Defenses

2
T1562

Disable or Modify Tools

2
T1562.001

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Tasks