Update:
We also learned that those who use Cloudflare may be affected by the issue(s) reported above.
Cloudflare offers a bot-fighting tool called, “Bot Fight Mode.” To access it, go to: Cloudflare > Firewall > Tools > Bot Fight Mode.
“Bot Fight Mode” – when activated – injects a small, necessary js file into your website which triggers a false-positive when running https://sitecheck.sucuri.net. You’ll get a 503 server error or a “Malware” found message.
We checked with Sucuri, SiteGround (our host), and Cloudfare about this. Their answers:
Sucuri: “We know nothing about this.” No investigations performed. Support was poor.
SiteGround: They double-checked our account for Malware and functionality issues. Nothing found.
Cloudflare: They confirmed that “Bot Fight Mode” is working as intended and that Sucuri needs to review the impact of Cloudflare’s “Bot Fight Mode” on Sucuri’s bots used for malware site-scanning. They need to update their logic and site-scan algorithms to ensure they whitelist Cloudflare’s js file.
For more information on this, please click below:
https://community.cloudflare.com/t/sucuri-has-flagged-as-a-malware-file/229587
Hope this helps the community, and also helps the developers of iThemes update their code to account for Cloudflare’s tool, “Bot Fight Mode.”