Beware the Return of Wednesday Malware

As fans eagerly await the return of Netflix's "Wednesday" series for its second season, malware by the same name has already made its mark. Last year, our threat management team discovered a malware they called "Wednesday 5.5", which caused havoc on servers around the world. Now, the malware has evolved to "Wednesday 5.6" with several other subversions, and in addition, a new malware within the same family was also identified lately. It seems that "Wednesday" is a name that strikes fear in the hearts of both fans of the show and IT professionals alike.

The previous article was about the notorious Wednesday Malware 5.5 and its impact on cybersecurity. As technology and cyber threats continue to evolve, so does the malware landscape. This follow-up article is a dive into the latest iteration of the Wednesday Malware – version 5.6, its four different subversions, and the mentioned new malware, the Malware Injector. 

The Evolution from 5.5 to 5.6 and the subversions

The 5.6 version of the Wednesday operates in the same way as its predecessor, 5.5, but with added intelligence and sophistication. This version comes with four distinct subversions. While each variant has its unique characteristics, they all share one common feature: every Wednesday, they return to the same address, from which they expect additional data to function maliciously.

Malware Injector

A new malware, which is not a Wednesday variant, has been identified within the same family. This malware, the Wednesday Injector, injects five different copies of the Wednesday 5.6 variant onto a compromised machine. 

The discovery of this new malware is a significant breakthrough for us as it sheds light on how the malware family gains access to systems.

Generating Signatures

Our team’s identification of the Wednesday Injector has enabled us to take preventative measures. By focusing on the commonality of the malware variants – the address to which they send requests to–, we can generate signatures to recognize and combat these threats effectively.

Once we find an address in the code – even if we have not yet identified the specific malware – we generate a signature from it. This method enables us to recognize the malware quickly and efficiently, particularly as long as this common point remains.


The evolution of Wednesday Malware 5.6 and its subversions demonstrates the ever-changing landscape of cyber threats. The addition of the Wednesday Injector to the malware family provides a greater understanding of the family's modus operandi and has allowed security teams to develop more effective measures to combat it. However, the discovery of the Wednesday Injector also highlights the need for individuals and businesses to remain vigilant and informed about emerging cyber threats.

As the Wednesday Malware evolves, so must our efforts to stay one step ahead in the battle against cybercrime. We can all work towards a safer online environment by keeping up to date with the latest developments in the malware landscape and working to identify and combat emerging threats.

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