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Malwarebytes customers are shielded against this campaign via our web protection in Endpoint Protection (EP), Endpoint Detection and Response (EDR) and Malwarebytes Premium. We have been documenting it recently and are reporting the abuse to Cloudflare which it uses to hide its real infrastructure. While the Kritec skimmer hangs around the Google Tag Manager script, we believe it is not related to the other active campaigns. It automatically searches your hard disk or any target you specify, and utilizes an advanced disk defragmenter which organizes your drive for quick and efficient access to your files.
In those instances, the malicious was actually embedded in the Google Tag Manager library itself, which is very clever and difficult to detect. FULL-DISKfighter is an easy-to-use, fast, and powerful utility that frees up valuable disk space by locating unnecessary and unneeded files. We mentioned Akamai's blog but it was also documented by Recorded Future. In the past months there have been several Magecart skimmers abusing Google Tag Manager in one way or another. On the left, the stolen credit card data is sent via a WebSocket skimmer while on the right, it is a POST request: The data exfiltration is also done differently as seen in the image below.
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The injected code calls out a first domain (seen above encoded in Base64) and generates a Base64 response:ĭecoding it reveals a URL pointing to the actual skimming code, which is heavily obfuscated (likely via obfuscator.io): It has an interesting way of loading the malicious JavaScript we had not seen before either. We started calling this new skimmer 'Kritec' after one of its domain names. To complicate things, we observed some stores that had both skimmers at the same time, which is another reason why we believe they are not related:
We believe this is a different campaign and threat actor altogether. They also list nebiltechshop in their IOCs which is a domain we sometimes saw injected near the Google Tag Manager script, but not within it. While details were not shared at the time, we were able to determine thanks to an archived crawl on urlscan.io that the skimmer was using WebSockets and is the same one as described in Akamai's blog.Īkamai notes that they identified multiple compromised websites that had similarities. Researchers at Akamai reported on a Magecart skimmer campaign disguised as Google Tag Manager that also made the news with the compromise of one of Canada's largest liquor store (LCBO). In this blog post, we show how the newly found Kritec skimmer was found along side one of its competitors. In fact, we saw instances of compromised stores having both skimmers loaded, which means double trouble for victims as their credit card information is stolen not just once but twice. In the listed indicators of compromise, we noticed domains that we had seen used in a distinct skimming campaign which didn't seem to be documented yet. Recently, while reading a blog post from security vendor Akamai, we spotted a similar situation. In the past, we have seen such occurrences with Magecart threat actors for example in the breach of the Umbro website. After all, if a vulnerability exists one can expect that it will be exploited more than once.
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