Network Connection Initiated To AzureWebsites.NET By Non-Browser Process

Title: Network Connection Initiated To AzureWebsites.NET By Non-Browser Process
Status: test
Description:Detects an initiated network connection by a non browser process on the system to "azurewebsites.net". The latter was often used by threat actors as a malware hosting and exfiltration site.
References:
  -https://www.sentinelone.com/labs/wip26-espionage-threat-actors-abuse-cloud-infrastructure-in-targeted-telco-attacks/
  -https://symantec-enterprise-blogs.security.com/threat-intelligence/harvester-new-apt-attacks-asia
  -https://www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/higaisa-or-winnti-apt-41-backdoors-old-and-new/
  -https://intezer.com/blog/research/how-we-escaped-docker-in-azure-functions/
Author: Nasreddine Bencherchali (Nextron Systems)
Date: 2024-06-24
modified:2024-07-16
Tags:

• -'attack.command-and-control'
• -'attack.t1102'
• -'attack.t1102.001'

Logsource:

• category: network_connection
• product: windows

Detection:
  selection:
    Initiated: 'true'
    DestinationHostname|endswith: 'azurewebsites.net'
  filter_main_chrome:
    Image:
      -'C:\Program Files\Google\Chrome\Application\chrome.exe'
      -'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'

  filter_main_chrome_appdata:
    Image|startswith: 'C:\Users\'
    Image|endswith: '\AppData\Local\Google\Chrome\Application\chrome.exe'
  filter_main_firefox:
    Image:
      -'C:\Program Files\Mozilla Firefox\firefox.exe'
      -'C:\Program Files (x86)\Mozilla Firefox\firefox.exe'

  filter_main_firefox_appdata:
    Image|startswith: 'C:\Users\'
    Image|endswith: '\AppData\Local\Mozilla Firefox\firefox.exe'
  filter_main_ie:
    Image:
      -'C:\Program Files (x86)\Internet Explorer\iexplore.exe'
      -'C:\Program Files\Internet Explorer\iexplore.exe'

  filter_main_edge_1:
Image|startswith:'C:\Program Files (x86)\Microsoft\EdgeWebView\Application\' Image|endswith:'\WindowsApps\MicrosoftEdge.exe'     - Image:
      - 'C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe'
      - 'C:\Program Files\Microsoft\Edge\Application\msedge.exe'
  filter_main_edge_2:
    Image|startswith:
      -'C:\Program Files (x86)\Microsoft\EdgeCore\'
      -'C:\Program Files\Microsoft\EdgeCore\'

    Image|endswith:
      -'\msedge.exe'
      -'\msedgewebview2.exe'

  filter_main_safari:
    Image|contains:
      -'C:\Program Files (x86)\Safari\'
      -'C:\Program Files\Safari\'

    Image|endswith: '\safari.exe'
  filter_main_defender:
    Image|contains:
      -'C:\Program Files\Windows Defender Advanced Threat Protection\'
      -'C:\Program Files\Windows Defender\'
      -'C:\ProgramData\Microsoft\Windows Defender\Platform\'

    Image|endswith:
      -'\MsMpEng.exe'
      -'\MsSense.exe'

  filter_main_prtg:
    Image|endswith:
      -'C:\Program Files (x86)\PRTG Network Monitor\PRTG Probe.exe'
      -'C:\Program Files\PRTG Network Monitor\PRTG Probe.exe'

  filter_main_brave:
    Image|startswith: 'C:\Program Files\BraveSoftware\'
    Image|endswith: '\brave.exe'
  filter_main_maxthon:
    Image|contains: '\AppData\Local\Maxthon\'
    Image|endswith: '\maxthon.exe'
  filter_main_opera:
    Image|contains: '\AppData\Local\Programs\Opera\'
    Image|endswith: '\opera.exe'
  filter_main_seamonkey:
    Image|startswith:
      -'C:\Program Files\SeaMonkey\'
      -'C:\Program Files (x86)\SeaMonkey\'

    Image|endswith: '\seamonkey.exe'
  filter_main_vivaldi:
    Image|contains: '\AppData\Local\Vivaldi\'
    Image|endswith: '\vivaldi.exe'
  filter_main_whale:
    Image|startswith:
      -'C:\Program Files\Naver\Naver Whale\'
      -'C:\Program Files (x86)\Naver\Naver Whale\'

    Image|endswith: '\whale.exe'
  filter_main_whaterfox:
    Image|startswith:
      -'C:\Program Files\Waterfox\'
      -'C:\Program Files (x86)\Waterfox\'

    Image|endswith: '\Waterfox.exe'
  filter_main_slimbrowser:
    Image|startswith:
      -'C:\Program Files\SlimBrowser\'
      -'C:\Program Files (x86)\SlimBrowser\'

    Image|endswith: '\slimbrowser.exe'
  filter_main_flock:
    Image|contains: '\AppData\Local\Flock\'
    Image|endswith: '\Flock.exe'
  filter_main_phoebe:
    Image|contains: '\AppData\Local\Phoebe\'
    Image|endswith: '\Phoebe.exe'
  filter_main_falkon:
    Image|startswith:
      -'C:\Program Files\Falkon\'
      -'C:\Program Files (x86)\Falkon\'

    Image|endswith: '\falkon.exe'
  filter_main_qtweb:
    Image|startswith:
      -'C:\Program Files (x86)\QtWeb\'
      -'C:\Program Files\QtWeb\'

    Image|endswith: '\QtWeb.exe'
  filter_main_avant:
    Image|startswith:
      -'C:\Program Files (x86)\Avant Browser\'
      -'C:\Program Files\Avant Browser\'

    Image|endswith: '\avant.exe'
  filter_main_discord:
    Image|contains: '\AppData\Local\Discord\'
    Image|endswith: '\Discord.exe'
  filter_main_null:
    Image: 'None'
  filter_main_empty:
    Image: ''
  condition:selection and not 1 of filter_main_*
Falsepositives:
  -Unknown
Level: medium