Connection to Commonly Abused Web Services

Adversaries may implement command and control communications that use common web services in order to hide their activity. This attack technique is typically targeted to an organization and uses web services common to the victim network which allows the adversary to blend into legitimate traffic. activity. These popular services are typically targeted since they have most likely been used before a compromise and allow adversaries to blend in the network.

Rule type: eql

Rule indices:

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

Version: 2 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 7.11.2

Rule authors: Elastic

Rule license: Elastic License

network where network.protocol == "dns" and /* Add new
WebSvc domains here */ wildcard(dns.question.name,
"*.githubusercontent.*",
"*.pastebin.*",
"*drive.google.*",
"*docs.live.*",
"*api.dropboxapi.*",
"*dropboxusercontent.*",
"*onedrive.*", "*4shared.*",
"*.file.io", "*filebin.net",
"*slack-files.com",
"*ghostbin.*", "*ngrok.*",
"*portmap.*", "*serveo.net",
"*localtunnel.me",
"*pagekite.me",
"*localxpose.io",
"*notabug.org" ) and
/* Insert noisy false positives here */ not process.name
in ("MicrosoftEdgeCP.exe",
"MicrosoftEdge.exe",
"iexplore.exe", "chrome.exe",
"msedge.exe", "opera.exe",
"firefox.exe", "Dropbox.exe",
"slack.exe", "svchost.exe",
"thunderbird.exe", "outlook.exe",
"OneDrive.exe")