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Malware detection
The term malware, short for "malicious software," refers to any software specifically designed to harm a computer or any software it has installed. Malware can steal sensitive information (like credit card numbers or passwords) or send fake emails from a user's email account, often without the user's knowledge. Malware may include, but is not limited to, viruses, worms, spyware, adware, and Trojan horses.
Containers are automatically scanned for malware. If malware is detected, the affected container will be flagged. Google Tag Manager will not fire tags that point to sites where malware is found.
How do sites and networks get infected?
d In most cases, affected users are unaware that there are tags that serve malware from their containers. Usually through no fault of your own, a network provider becomes infected when they install tainted 3rd party libraries or templates onto their websites, and subsequently transmit that malware to your site via the custom HTML tag that you published onto your website via Tag Manager.
Common symptoms of malware on your site can include unwanted URL redirects, pop-up ads, altered search results, the addition of unwanted browser toolbars or side-search bars, and slow computer speeds.
What can I do if my container gets flagged for malware?
If your container has been flagged for malware, a notification email will be sent to the container owners. Tag Manager will show an alert that a tag is "malware flagged" if it is live in the published version, and the version history will show the same.
To resolve this issue, go into the problematic container and remove all triggers from any malware-affected tags, and remove those tags from any tag sequencing so that they are completely disabled.
When your repaired container configuration has been republished, it will be re-scanned for malware automatically.
