What is Sucuri?

Sucuri is a bot in the security scanners category, operated by Sucuri.

Bot name
Sucuri
Operator
Sucuri
Type
Bot
Respects robots.txt
Not confirmed
robots.txt user agent
Sucuri
Signs requests (Web Bot Auth)
No

About Sucuri

The Sucuri bot is part of the Sucuri website security platform. It crawls websites to scan for malware, security risks, and blacklisting status.

Security scanners probe sites for vulnerabilities, certificates and exposed services. Some are research projects, some are vendors you hired. Allow your own scanners and block the rest at the WAF.

Sucuri user agent

Sucuri identifies itself with this user agent string:

  • Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 MSIE 7.0; Sucuri Integrity Monitor/2.4

Anyone can copy a user agent string. Transfon Security also checks where each request comes from, so a request that claims to be a known crawler but comes from the wrong network is treated as a fake, not as the real crawler.

How to block Sucuri in robots.txt

We have not confirmed whether Sucuri follows robots.txt. Add a rule, then check your logs to see that it stopped. robots.txt is a plain text file at the root of your domain, such as https://example.com/robots.txt.

Block Sucuri from the whole site

User-agent: Sucuri
Disallow: /

Block Sucuri from some folders

User-agent: Sucuri
Disallow: /private/
Disallow: /search

Allow Sucuri only on some folders

User-agent: Sucuri
Allow: /blog/
Disallow: /

Allow Sucuri and block other crawlers

User-agent: Sucuri
Allow: /

User-agent: *
Disallow: /

Things to know

  • Each host needs its own file. Rules on www.example.com do not apply to shop.example.com.
  • A crawler obeys only the most specific group that names it. Once you add a User-agent: Sucuri group, Sucuri ignores your User-agent: * rules, so repeat any that should still apply.
  • The user agent name is not case sensitive. We take Sucuri from Sucuri's user agent; check Sucuri's own documentation if it publishes a different robots.txt name.
  • Crawlers cache robots.txt, so changes can take up to a day to apply. Disallow stops crawling but does not remove pages already collected or indexed.

Limits of robots.txt

  1. Sucuri may not follow the rule. robots.txt is a request that nothing enforces, and we have not confirmed that Sucuri follows it. Check your logs after adding a rule.
  2. The user agent could be fake. robots.txt matches the name a request claims. Anyone can send Sucuri's user agent, and a scraper using it is not bound by Sucuri's robots.txt policy. Only checking the source network tells a real Sucuri from a fake one.

Treat robots.txt as a statement of your policy, and enforce it where requests arrive.

Who should care about Sucuri

Publishers

Allow Sucuri if it is a service you use, and keep its visits out of page views and ad requests either way.

Transfon Security for publishers

Media buyers and advertisers

Sucuri is not a person. Exclude it from campaign and conversion data so reports reflect real visitors.

Transfon Security for advertisers

E-commerce

Allow Sucuri only if it works for your store, and keep it away from cart and checkout.

Transfon Security for e-commerce

SaaS and APIs

If Sucuri is a service you use, allow it on the endpoints it needs and block it elsewhere.

Transfon Security for SaaS and APIs

Block Sucuri with Transfon Security

robots.txt is a request, not an enforcement. Transfon Security shows Sucuri by name in the Top Bots report, so you can see how often it visits and which pages it reads. Block or allow it with a User Agent rule, or slow it down with a rate limit decision rule.

Transfon Security

Control Sucuri on your site

  • See every Sucuri visit and the pages it reads
  • Spot bots that fake trusted crawler names
  • Block, allow or rate limit Sucuri with one rule
  • Works with or without robots.txt support

Frequently asked questions

What is Sucuri?

Sucuri is a bot in the security scanners category, operated by Sucuri. The Sucuri bot is part of the Sucuri website security platform. It crawls websites to scan for malware, security risks, and blacklisting status.

Does Sucuri respect robots.txt?

We have not confirmed whether Sucuri follows robots.txt. Add a robots.txt rule, then check your logs to see that it stopped, and block it by user agent if it did not.

How do I block Sucuri?

Add "User-agent: Sucuri" followed by "Disallow: /" to the robots.txt file at the root of your site. To enforce it, block requests whose user agent contains "Sucuri" at your WAF. In Transfon Security that is one User Agent block rule.

Is robots.txt enough to block Sucuri?

No. robots.txt is voluntary, so Sucuri may not follow it, and anyone can send Sucuri's user agent, so a fake Sucuri ignores your rule. Enforce the rule where requests arrive, at your WAF, and check the source network.

Should I block Sucuri?

Security scanners probe sites for vulnerabilities, certificates and exposed services. Some are research projects, some are vendors you hired. Allow your own scanners and block the rest at the WAF.

Related bots

All security scanners · Full bot directory

See Which Bots Visit Your Site

Transfon Security identifies every bot in this directory in your traffic reports, flags fake search crawlers, and lets you allow, block or rate limit each bot.

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