What it detects01
What does 'Favicon Hash Periodic Rotation Pattern' indicate?
It indicates that favicon hashes change following a regular or repeating time pattern, suggesting automated or scheduled favicon rotation.
Favicon Hash Periodic Rotation Pattern
It indicates that favicon hashes change following a regular or repeating time pattern, suggesting automated or scheduled favicon rotation.
Analyst Q&A
What this signal answers
The questions every analyst asks before acting on this signal.
Why it matters02
Why is this considered a risky signal?
Periodic favicon rotation is uncommon in legitimate websites but frequently observed in automated infrastructures, phishing kits, or evasive deployment pipelines.
How analysts use it03
How should SOC analysts use this label?
Use it as a pattern-strengthening signal when favicon hash churn is already present, especially in combination with other indicators of automated or campaign-based activity.
Often paired with:alert_only
Evidence shape
What Favicon Hash Periodic Rotation Pattern looks like in the response
A realistic shape of the entry the engine appends to the risk_signals array when this signal fires. Evidence keys are subgroup-default; per-signal overrides documented in the API reference.
json
{
"slug": "favicon_hash_rotation_periodic_pattern",
"name": "Favicon Hash Periodic Rotation Pattern",
"group": "http_crawling_history",
"subgroup": "favicon_behaviour",
"direction": "malicious",
"evidence": {
"favicon_hash": "-1293291467",
"unique_hash_count_90d": 3,
"favicon_domain": "cdn-login-assets[.]top",
"hosting_type": "third_party",
"service_match": false
}
}Siblings
Peers in Favicon Behavior
16 other signals share the same subgroup. They detect related behaviors and often co-fire on the same IOC.
Favicon Hash Change Burst Window
It indicates that multiple favicon hash changes occurred within a short time window, reflecting sudden instability in fa…
Malicious
Favicon Hash Recently First Seen
It indicates that a recent change occurred in the favicon hash associated with the domain, highlighting short-term insta…
Malicious
High Favicon Hash Churn
It indicates that the favicon hash associated with a domain has changed over time, reflecting instability in the site's …
MaliciousCore
Stable Single Favicon Hash
It indicates that only one favicon hash has been observed for the domain and that the hash has not changed across multip…
Safe
In the wild
See Favicon Hash Periodic Rotation Pattern fire on real IOCs
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