Overview

overview

10

Static

static

3

c4931e69ad...9c.exe

windows7-x64

6

c4931e69ad...9c.exe

windows10-2004-x64

10

Sharing

Copy URL
Twitter E-mail

General

  • Target

    c4931e69ad579b38cec44aa9edb8059c

  • Size

    638KB

  • Sample

    240313-bfebvsab23

  • MD5

    c4931e69ad579b38cec44aa9edb8059c

  • SHA1

    95421f27626920e4ec0427c0b5c2d4e10a6a4e87

  • SHA256

    a6accf62cd5ec2b1fdd5da1a8611913453f129a96c495ca5a8d7fcc1a6a47061

  • SHA512

    0f7d46742941ac4890f2c4521843b9c2f037fcb60dfaba1c76f7a5cb55ce88c3a0936d1f99195e59e418dc89b1bd2c06395c54d237b348b0f77605ac85b365de

  • SSDEEP

    12288:a+BbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0RqsT79:a+Bxrd4lA7OvR/fqKoqsxsvoyFtbsqsd

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

      c4931e69ad579b38cec44aa9edb8059c

    • Size

      638KB

    • MD5

      c4931e69ad579b38cec44aa9edb8059c

    • SHA1

      95421f27626920e4ec0427c0b5c2d4e10a6a4e87

    • SHA256

      a6accf62cd5ec2b1fdd5da1a8611913453f129a96c495ca5a8d7fcc1a6a47061

    • SHA512

      0f7d46742941ac4890f2c4521843b9c2f037fcb60dfaba1c76f7a5cb55ce88c3a0936d1f99195e59e418dc89b1bd2c06395c54d237b348b0f77605ac85b365de

    • SSDEEP

      12288:a+BbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0RqsT79:a+Bxrd4lA7OvR/fqKoqsxsvoyFtbsqsd

    Score
    10/10
    persistencequasarvenomratwindows firewallevasionratrootkitspywarestealertrojan

    • 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

    • 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