A researcher has discovered a pair of new Magecart-style web skimmers, each one featuring an evasion technique that’s not typically employed by this breed of malware: steganography and the transfer a data via the WebSocket protocol.
The researcher, who uses the handle @AffableKraut, posted his two findings on Twitter last month, prompting the team from Malwarebytes to further analyze the threats and report the findings.
According to Malwarebytes, the steganography-based skimmer is the first documented skimmer to use this technique, which commonly involves hiding code within harmless-looking imagery.
In a Dec. 26 tweet, @AffableKraut said a colleague of his found the skimmer while searching through SIEM data. “The skimmer group uploads or modifies an existing image and appends the JS code,” the researcher says. In this case, the image appears to be an innocuous “free shipping” ribbon, which was observed on a shopping site.
“As it happens, the majority of web crawlers and scanners will concentrate on HTML and JavaScript files, and often ignore media ..
Support the originator by clicking the read the rest link below.
