Overview

overview

10

Static

static

10

Update.exe

windows10-1703-x64

10

Update.exe

windows10-2004-x64

10

Update.exe

windows11-21h2-x64

10

Sharing

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General

  • Target

    Update.exe

  • Size

    413KB

  • Sample

    240707-xctg9swgmk

  • MD5

    8d4ed7f39ea9c8d397d9fe7cde96f96f

  • SHA1

    1c9f7a1004a813aec578529267f13cf59c963dc6

  • SHA256

    021453aad14a59162bbdcc15650f5c7595a8141864b8f41c1154b1ea7d0edad1

  • SHA512

    75f580d2fbfacd287529434f9fda86a9cc237c4c8a328f93abe2e18b531bf138512e07e359f30a5e1a239f15849e560f3fd8fbcb77eb3568d3e73f4b2155a7d9

  • SSDEEP

    6144:ZhmEjkzQT1TVNfUacoN2IAanViSRHxb3DFFu4zccHoY0MKfIR+wt7IWqsGa:r1TVVDfAanViSr2GccHN2I0wFfGa

Score
10/10
quasaroffice04executionspywaretrojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

Office04

C2

ireless-boston.gl.at.ply.gg:41366

Mutex

$Sxr-a4FI5KvPJWMj2Jorq9

Attributes
  • encryption_key

    2n7OoPxwl2unZ7DjPE2s

  • install_name

    systemlogs.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    systemlogs

  • subdirectory

    SubDir

Targets

    • Target

      Update.exe

    • Size

      413KB

    • MD5

      8d4ed7f39ea9c8d397d9fe7cde96f96f

    • SHA1

      1c9f7a1004a813aec578529267f13cf59c963dc6

    • SHA256

      021453aad14a59162bbdcc15650f5c7595a8141864b8f41c1154b1ea7d0edad1

    • SHA512

      75f580d2fbfacd287529434f9fda86a9cc237c4c8a328f93abe2e18b531bf138512e07e359f30a5e1a239f15849e560f3fd8fbcb77eb3568d3e73f4b2155a7d9

    • SSDEEP

      6144:ZhmEjkzQT1TVNfUacoN2IAanViSRHxb3DFFu4zccHoY0MKfIR+wt7IWqsGa:r1TVVDfAanViSr2GccHN2I0wFfGa

    Score
    10/10
    quasaroffice04executionspywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

      execution

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

      execution

    • Drops file in Drivers directory

    • Checks computer location settings

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

    • Executes dropped EXE

    • Looks up external IP address via web service

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

    • Drops file in System32 directory

    behavioral1behavioral2behavioral3

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

3
T1059

PowerShell

2
T1059.001

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

Credential Access

Discovery

Query Registry

1
T1012

System Information Discovery

3
T1082

Remote System Discovery

1
T1018

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Tasks