Overview

overview

10

Static

static

3

Update.exe

windows7-x64

10

Update.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    Update.exe

  • Size

    20.4MB

  • Sample

    240601-b2cedsdc2z

  • MD5

    88246c2a001042481486e559a6d10d91

  • SHA1

    e64a646ba23b7795ec3dfb5ae4d80b02c7dd274f

  • SHA256

    4a424271b9a191afc76110e2bccd45f23cc281853f223d3e27756e16c14b5019

  • SHA512

    f3daab1877324bc8ac1f52bc9d1c7327230840fc53899aed47b69dd6b7e996cf3fde70c7efe209fa6fb9d80d58687abbd2f144a66e26de17b99b539d20f6e5ad

  • SSDEEP

    393216:XlHpZSFSVTVyVSJXSUEJRnpyQnXUWJjv0xamVNA3guo9N:9p0FmyVSNSUE7npyQnkWJjv0DV23o

Score
10/10
quasaremmassubdiscoveryexecutionspywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

EmmasSub

C2

85.23.24.170:4782

85.23.109.34:4782

82.128.254.93:4782
Mutex

f82c7021-f558-4f6f-bbb3-fbe420c708e5

Attributes
  • encryption_key

    4DC093FC202D016F95DCEE92AAF2874F56ACC3F2

  • install_name

    RuntimeBroker.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Update

  • subdirectory

    WindowsSecureManager

Targets

    • Target

      Update.exe

    • Size

      20.4MB

    • MD5

      88246c2a001042481486e559a6d10d91

    • SHA1

      e64a646ba23b7795ec3dfb5ae4d80b02c7dd274f

    • SHA256

      4a424271b9a191afc76110e2bccd45f23cc281853f223d3e27756e16c14b5019

    • SHA512

      f3daab1877324bc8ac1f52bc9d1c7327230840fc53899aed47b69dd6b7e996cf3fde70c7efe209fa6fb9d80d58687abbd2f144a66e26de17b99b539d20f6e5ad

    • SSDEEP

      393216:XlHpZSFSVTVyVSJXSUEJRnpyQnXUWJjv0xamVNA3guo9N:9p0FmyVSNSUE7npyQnkWJjv0DV23o

    Score
    10/10
    quasaremmassubdiscoveryexecutionspywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Command and Scripting Interpreter: PowerShell

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

      execution

    • Executes dropped EXE

    • Loads dropped DLL

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

      discovery

    • Drops file in System32 directory

    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

3
T1012

System Information Discovery

2
T1082

Peripheral Device Discovery

1
T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Tasks