Overview

overview

10

Static

static

1

$77-Built.bat

windows10-1703-x64

10

$77-Built.bat

windows10-2004-x64

10

$77-Built.bat

windows11-21h2-x64

10

Sharing

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General

  • Target

    $77-Built.bat

  • Size

    3.5MB

  • Sample

    240526-yck2kahd6w

  • MD5

    297d7e65305917b5a212ca9f4b4d99d2

  • SHA1

    402192fd3b13ea1fd26403e227ceb119e8569b4c

  • SHA256

    cbe56ba5a86d713c4f57d42e3084f9879c379367c46054b805e85922e5654bf9

  • SHA512

    6055d50144ca5a3e6c8889a659d63d654a3a84fb2be78ad36335d0877095592b7923e309c9d818ea9d5fc17a7d4f1b61c3318acddb9ea5041cf0fd996e27cb1a

  • SSDEEP

    49152:cYbGAyBfhKnc19015vyfIchfKpcuGj8RmSMvANLFt/X9oS4ot3X3tLdDh:cG

Score
10/10
quasarrootkitexecutionspywaretrojan

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    3000

Extracted

Family

quasar

Version

1.4.1

Botnet

Rootkit

C2

uk2.localto.net:3444

Mutex

13b8023a-5596-4efa-b088-c87d2ca4e84f

Attributes
  • encryption_key

    6BE0D74806BB58E6DB21FA6E3B6DB38B4A72BAFC

  • install_name

    $77-powershell.exe

  • log_directory

    $77-Logs

  • reconnect_delay

    3000

  • startup_key

    Discord

  • subdirectory

    $77-Rootkit

Targets

    • Target

      $77-Built.bat

    • Size

      3.5MB

    • MD5

      297d7e65305917b5a212ca9f4b4d99d2

    • SHA1

      402192fd3b13ea1fd26403e227ceb119e8569b4c

    • SHA256

      cbe56ba5a86d713c4f57d42e3084f9879c379367c46054b805e85922e5654bf9

    • SHA512

      6055d50144ca5a3e6c8889a659d63d654a3a84fb2be78ad36335d0877095592b7923e309c9d818ea9d5fc17a7d4f1b61c3318acddb9ea5041cf0fd996e27cb1a

    • SSDEEP

      49152:cYbGAyBfhKnc19015vyfIchfKpcuGj8RmSMvANLFt/X9oS4ot3X3tLdDh:cG

    Score
    10/10
    quasarrootkitexecutionspywaretrojan

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

      trojanspywarequasar

    • Quasar payload

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

      execution

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

    behavioral1behavioral2behavioral3

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

6
T1012

System Information Discovery

6
T1082

Peripheral Device Discovery

1
T1120

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Tasks