likely with other browser software. apply additional filters for any other browsers you might use.

Techniques

t1219

Sample rules

DNS Query To AzureWebsites.NET By Non-Browser Process

source: sigma
technicques:
- t1219

Description

Detects a DNS query 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.

Detection logic

condition: selection and not 1 of filter_optional_*
filter_optional_avant:
  Image|endswith: \avant.exe
  Image|startswith:
  - C:\Program Files (x86)\Avant Browser\
  - C:\Program Files\Avant Browser\
filter_optional_brave:
  Image|endswith: \brave.exe
  Image|startswith: C:\Program Files\BraveSoftware\
filter_optional_chrome:
  Image:
  - C:\Program Files\Google\Chrome\Application\chrome.exe
  - C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
filter_optional_defender:
  Image|endswith:
  - \MsMpEng.exe
  - \MsSense.exe
filter_optional_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_optional_edge_2:
  Image|endswith:
  - \msedge.exe
  - \msedgewebview2.exe
  Image|startswith:
  - C:\Program Files (x86)\Microsoft\EdgeCore\
  - C:\Program Files\Microsoft\EdgeCore\
filter_optional_falkon:
  Image|endswith: \falkon.exe
  Image|startswith:
  - C:\Program Files\Falkon\
  - C:\Program Files (x86)\Falkon\
filter_optional_firefox:
  Image:
  - C:\Program Files\Mozilla Firefox\firefox.exe
  - C:\Program Files (x86)\Mozilla Firefox\firefox.exe
filter_optional_flock:
  Image|contains: \AppData\Local\Flock\
  Image|endswith: \Flock.exe
filter_optional_ie:
  Image:
  - C:\Program Files (x86)\Internet Explorer\iexplore.exe
  - C:\Program Files\Internet Explorer\iexplore.exe
filter_optional_maxthon:
  Image|contains: \AppData\Local\Maxthon\
  Image|endswith: \maxthon.exe
filter_optional_midori:
  Image|contains: \AppData\Local\Programs\midori-ng\
  Image|endswith: \Midori Next Generation.exe
filter_optional_opera:
  Image|contains: \AppData\Local\Programs\Opera\
  Image|endswith: \opera.exe
filter_optional_phoebe:
  Image|contains: \AppData\Local\Phoebe\
  Image|endswith: \Phoebe.exe
filter_optional_safari:
  Image|endswith: \safari.exe
filter_optional_seamonkey:
  Image|endswith: \seamonkey.exe
  Image|startswith:
  - C:\Program Files\SeaMonkey\
  - C:\Program Files (x86)\SeaMonkey\
filter_optional_slimbrowser:
  Image|endswith: \slimbrowser.exe
  Image|startswith:
  - C:\Program Files\SlimBrowser\
  - C:\Program Files (x86)\SlimBrowser\
filter_optional_tor:
  Image|contains: \Tor Browser\
filter_optional_vivaldi:
  Image|contains: \AppData\Local\Vivaldi\
  Image|endswith: \vivaldi.exe
filter_optional_whale:
  Image|endswith: \whale.exe
  Image|startswith:
  - C:\Program Files\Naver\Naver Whale\
  - C:\Program Files (x86)\Naver\Naver Whale\
filter_optional_whaterfox:
  Image|endswith: \Waterfox.exe
  Image|startswith:
  - C:\Program Files\Waterfox\
  - C:\Program Files (x86)\Waterfox\
selection:
  QueryName|endswith: azurewebsites.net

DNS Query To Remote Access Software Domain From Non-Browser App

source: sigma
technicques:
- t1219

Description

An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be allowed by application control within a target environment. Remote access tools like VNC, Ammyy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. (Citation: Symantec Living off the Land)

Detection logic

condition: 1 of selection_* and not 1 of filter_optional_*
filter_optional_avant:
  Image|endswith: \avant.exe
  Image|startswith:
  - C:\Program Files (x86)\Avant Browser\
  - C:\Program Files\Avant Browser\
filter_optional_brave:
  Image|endswith: \brave.exe
  Image|startswith: C:\Program Files\BraveSoftware\
filter_optional_chrome:
  Image:
  - C:\Program Files\Google\Chrome\Application\chrome.exe
  - C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
filter_optional_defender:
  Image|endswith:
  - \MsMpEng.exe
  - \MsSense.exe
filter_optional_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_optional_edge_2:
  Image|endswith:
  - \msedge.exe
  - \msedgewebview2.exe
  Image|startswith:
  - C:\Program Files (x86)\Microsoft\EdgeCore\
  - C:\Program Files\Microsoft\EdgeCore\
filter_optional_falkon:
  Image|endswith: \falkon.exe
  Image|startswith:
  - C:\Program Files\Falkon\
  - C:\Program Files (x86)\Falkon\
filter_optional_firefox:
  Image:
  - C:\Program Files\Mozilla Firefox\firefox.exe
  - C:\Program Files (x86)\Mozilla Firefox\firefox.exe
filter_optional_flock:
  Image|contains: \AppData\Local\Flock\
  Image|endswith: \Flock.exe
filter_optional_ie:
  Image:
  - C:\Program Files (x86)\Internet Explorer\iexplore.exe
  - C:\Program Files\Internet Explorer\iexplore.exe
filter_optional_maxthon:
  Image|contains: \AppData\Local\Maxthon\
  Image|endswith: \maxthon.exe
filter_optional_midori:
  Image|contains: \AppData\Local\Programs\midori-ng\
  Image|endswith: \Midori Next Generation.exe
filter_optional_opera:
  Image|contains: \AppData\Local\Programs\Opera\
  Image|endswith: \opera.exe
filter_optional_phoebe:
  Image|contains: \AppData\Local\Phoebe\
  Image|endswith: \Phoebe.exe
filter_optional_safari:
  Image|endswith: \safari.exe
filter_optional_seamonkey:
  Image|endswith: \seamonkey.exe
  Image|startswith:
  - C:\Program Files\SeaMonkey\
  - C:\Program Files (x86)\SeaMonkey\
filter_optional_slimbrowser:
  Image|endswith: \slimbrowser.exe
  Image|startswith:
  - C:\Program Files\SlimBrowser\
  - C:\Program Files (x86)\SlimBrowser\
filter_optional_tor:
  Image|contains: \Tor Browser\
filter_optional_vivaldi:
  Image|contains: \AppData\Local\Vivaldi\
  Image|endswith: \vivaldi.exe
filter_optional_whale:
  Image|endswith: \whale.exe
  Image|startswith:
  - C:\Program Files\Naver\Naver Whale\
  - C:\Program Files (x86)\Naver\Naver Whale\
filter_optional_whaterfox:
  Image|endswith: \Waterfox.exe
  Image|startswith:
  - C:\Program Files\Waterfox\
  - C:\Program Files (x86)\Waterfox\
selection_generic:
  QueryName|endswith:
  - agent.jumpcloud.com
  - agentreporting.atera.com
  - ammyy.com
  - api.parsec.app
  - api.playanext.com
  - api.splashtop.com
  - app.atera.com
  - assist.zoho.com
  - authentication.logmeininc.com
  - beyondtrustcloud.com
  - cdn.kaseya.net
  - client.teamviewer.com
  - comserver.corporate.beanywhere.com
  - control.connectwise.com
  - downloads.zohocdn.com
  - dwservice.net
  - express.gotoassist.com
  - getgo.com
  - getscreen.me
  - integratedchat.teamviewer.com
  - join.zoho.com
  - kickstart.jumpcloud.com
  - license.bomgar.com
  - logmein-gateway.com
  - logmein.com
  - logmeincdn.http.internapcdn.net
  - n-able.com
  - net.anydesk.com
  - netsupportsoftware.com
  - parsecusercontent.com
  - pubsub.atera.com
  - relay.kaseya.net
  - relay.screenconnect.com
  - relay.splashtop.com
  - remoteassistance.support.services.microsoft.com
  - remotedesktop-pa.googleapis.com
  - remoteutilities.com
  - secure.logmeinrescue.com
  - services.vnc.com
  - static.remotepc.com
  - swi-rc.com
  - swi-tc.com
  - tailscale.com
  - telemetry.servers.qetqo.com
  - tmate.io
  - twingate.com
  - zohoassist.com
selection_rustdesk:
  QueryName|endswith: .rustdesk.com
  QueryName|startswith: rs-