What it detects01
What does 'Favicon Hash Churn' indicate?
It indicates that the favicon hash associated with a domain has changed over time, reflecting instability in the site's favicon fingerprint.
High Favicon Hash Churn
It indicates that the favicon hash associated with a domain has changed over time, reflecting instability in the site's favicon fingerprint.
Analyst Q&A
What this signal answers
The questions every analyst asks before acting on this signal.
Why it matters02
Why is favicon hash churn considered risky?
Frequent changes to favicon assets are uncommon in stable websites and are often observed in rapidly redeployed, disposable, or evasive web infrastructures.
How analysts use it03
How should SOC analysts interpret low vs high churn?
Low churn suggests limited or occasional changes, while high churn indicates frequent changes that may point to automated redeployment or campaign-driven behavior.
Often paired with:block_domain
Evidence shape
What High Favicon Hash Churn 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_churn",
"name": "High Favicon Hash Churn",
"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 Periodic Rotation Pattern
It indicates that favicon hashes change following a regular or repeating time pattern, suggesting automated or scheduled…
Malicious
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
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
In the wild
See High Favicon Hash Churn fire on real IOCs
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