Multiple vendors were hacked in a coordinated supply chain attack, Sansec found 21 applications with the same backdoor. Curiously, the malware was injected 6 years ago, but came to life this week as attackers took full control of ecommerce servers. Sansec estimates that between 500 and 1000 stores are running backdoored software.

Hundreds of stores, including a $40 billion multinational, are running backdoored versions of popular ecommerce software. We found that the backdoor is actively used since at least April 20th. Sansec identified these backdoors in the following packages which were published between 2019 and 2022.

Vendor Package
Tigren Ajaxsuite
Tigren Ajaxcart
Tigren Ajaxlogin
Tigren Ajaxcompare
Tigren Ajaxwishlist
Tigren MultiCOD
Meetanshi ImageClean
Meetanshi CookieNotice
Meetanshi Flatshipping
Meetanshi FacebookChat
Meetanshi CurrencySwitcher
Meetanshi DeferJS
MGS Lookbook
MGS StoreLocator
MGS Brand
MGS GDPR
MGS Portfolio
MGS Popup
MGS DeliveryTime
MGS ProductTabs
MGS Blog
We established that Tigren, Magesolution (MGS) and Meetanshi servers have been breached and that attackers were able to inject backdoors on their download servers.

This hack is called a Supply Chain Attack, which is one of the worst types. By hacking these vendors, the attacker gained access to all of their customers' stores. And by proxy, to all of the customers that visit these stores.

We also found a backdoored version of the Weltpixel GoogleTagManager extension, but we have not been able to establish whether Weltpixel or these particular stores got compromised.