Overview

overview

10

Static

static

3

BuiltStub.exe

windows10-ltsc 2021-x64

10

BuiltStub.exe

windows11-21h2-x64

10

Sharing

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General

  • Target

    BuiltStub.exe

  • Size

    5.1MB

  • Sample

    241107-zr9h5sxqfw

  • MD5

    f9459b5f142a8f9acd593c54a3d96c81

  • SHA1

    0308afb7f63eceac4c83ec8d1f9c377b027b81be

  • SHA256

    e014eb99de60b913905f2a6c4267f663c36beee4ef35df66e8ca7f372b871b9b

  • SHA512

    7f4e632b5d4f4718e081c0c2fb59af8dae928880193565b786a8ac870b77e9be9a4aab10f8d1172093671ee45d187fa81a4c369a1fb5d9e46477b7e033eb862e

  • SSDEEP

    49152:YxF/k4/9svPpW78mZEm62L9RiBx4xpqeWK+0dr5Efn7qbZp5m6XH:LXpYaR4xc4Ee9pw8

Score
10/10
remcosremotehostcollectioncredential_accessdiscoveryevasionratstealertrojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

194.59.31.143:4444

Attributes
  • audio_folder

    Random

  • audio_path

    %SystemDrive%

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    DirectX.exe

  • copy_folder

    DirectX

  • delete_file

    true

  • hide_file

    true

  • hide_keylog_file

    true

  • install_flag

    false

  • install_path

    %SystemDrive%

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    Root

  • keylog_path

    %SystemDrive%

  • mouse_option

    false

  • mutex

    Rmc-BGWZJ0

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Targets

    • Target

      BuiltStub.exe

    • Size

      5.1MB

    • MD5

      f9459b5f142a8f9acd593c54a3d96c81

    • SHA1

      0308afb7f63eceac4c83ec8d1f9c377b027b81be

    • SHA256

      e014eb99de60b913905f2a6c4267f663c36beee4ef35df66e8ca7f372b871b9b

    • SHA512

      7f4e632b5d4f4718e081c0c2fb59af8dae928880193565b786a8ac870b77e9be9a4aab10f8d1172093671ee45d187fa81a4c369a1fb5d9e46477b7e033eb862e

    • SSDEEP

      49152:YxF/k4/9svPpW78mZEm62L9RiBx4xpqeWK+0dr5Efn7qbZp5m6XH:LXpYaR4xc4Ee9pw8

    Score
    10/10
    remcosremotehostcollectioncredential_accessdiscoveryevasionratstealertrojan

    • Remcos

      Remcos is a closed-source remote control and surveillance software.

      ratremcos

    • Remcos family

      remcos

    • UAC bypass

      evasiontrojan

    • Detected Nirsoft tools

      Free utilities often used by attackers which can steal passwords, product keys, etc.

    • NirSoft MailPassView

      Password recovery tool for various email clients

    • NirSoft WebBrowserPassView

      Password recovery tool for various web browsers

    • Uses browser remote debugging

      Can be used control the browser and steal sensitive information such as credentials and session cookies.

      credential_accessstealer

    • Executes dropped EXE

    • Accesses Microsoft Outlook accounts

      collection

    • Suspicious use of SetThreadContext

    behavioral1behavioral2

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Modify Authentication Process

1
T1556

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Modify Authentication Process

1
T1556

Modify Registry

3
T1112

Subvert Trust Controls

1
T1553

Install Root Certificate

1
T1553.004

Credential Access

Modify Authentication Process

1
T1556

Steal Web Session Cookie

1
T1539

Discovery

Query Registry

1
T1012

System Information Discovery

1
T1082

System Location Discovery

1
T1614

System Language Discovery

1
T1614.001

Lateral Movement

Collection

Email Collection

1
T1114

Command and Control

Exfiltration

Impact

Tasks