Jester stealer is an information stealer that has been around since mid-July 2021. Originally sold by the Russian speaking threat group "Jester_Stealer", in several underground forums and Telegram channels, they operate under a Malware-as-a-Service (MaaS) model and present themselves as a group of programmers. Here we delved into the Jester stealer functionalities with a code-level analysis and highlight the possible link between Jester stealer and the new breed of Eternity stealer.

This blog describes the attack path we have uncovered during a recent penetration test of a web application, coupled with a back-end infrastructure assessment. Throughout we introduce different attack techniques and tools that can be used to attack the underlying infrastructure and APIs of a web application.

In our latest credit card fraud investigation blog our threat intelligence analysts investigate the current card shop ecosystem, from active shops and the return of Rescator as well as other recently shuttered card shops and credit card fraud to look out for. Methodology Credit Card Fraud Investigation: Active Card Shops Credit Card Fraud Investigation: Inactive Card Shops Conclusions

Ransomware continues to be a prevalent threat to almost every modern industry after a sudden renaissance at the beginning of the COVID-19 pandemic as threat actors sought to capitalize on overwhelmed organizations and their suddenly vulnerable employees. It poses a particular danger to companies that hold sensitive data and house valuable assets, or those that could impact countless other industries and organizations should their critical operations be taken offline.

Corporate credential theft is a targeted effort and makes FTSE 100 companies credentials particularly attractive to cybercriminals with accelerated digital transformation (BYOD and hybrid working). Once an attacker gets hold of stolen user credentials and passwords, they can sell the credentials in the cybercrime underground or use them to compromise an organization’s network, bypassing security measures and threaten the credibility and integrity of the institution.

The first few months of 2022 have brought with them plenty of breaches and vulnerabilities for threat experts to sink their teeth into; in March alone, Microsoft has patched 71 CVEs, two of which, CVE-2022-22006 and CVE-2022-24501, were deemed critical–but more on those later. Meanwhile, cloud-based software company Okta has suffered a cyber-attack, believed to be at the hands of threat actor “Lapsus$”, which has put thousands of its 15,000 customers on high alert.

On Wednesday 30th March 2022, news was disclosed online about an unauthenticated RCE zero-day vulnerability in Spring Core, a framework for building modern Java-based enterprise applications.

An RCE vulnerability affecting Spring Core’s JDK 9 and later has become a trending topic in cybersecurity networks during the past couple days. This discovery, compared by some to the Log4Shell vulnerability, generated a lot of confusion and even got mistook with a different vulnerability affecting Spring Cloud, which got a CVE assigned the same day, and even linked them to completely unrelated commits on Spring Core’s GitHub.

It’s open source, anyone can audit it, but is it safe? In this blog our CSO explores why distribution of malicious scripts via libraries is causing a stir amongst the open-source community and how you can defend against it.