FISA

  An updated version of an information stealer malware known as Jupyter has resurfaced with "simple yet impactful changes" that aim to stealthily establish a persistent foothold on compromised systems. "The team has discovered new waves of Jupyter Infostealer attacks which leverage PowerShell command modifications and signatures of private keys in attempts to pass off the malware as a legitimately signed file," VMware Carbon Black researchers said in a report shared with The Hacker News. Jupyter Infostealer, also known as Polazert, SolarMarker, and Yellow Cockatoo, has a track record of leveraging manipulated search engine optimization (SEO) tactics and malvertising as an initial access vector to trick users searching for popular software into downloading it from dubious websites. It comes with capabilities to harvest credentials as well as establish encrypted command-and-control (C2) communication to exfiltrate data and execute arbitrary commands. Th...

A new "mass-spreading" social engineering campaign is targeting users of the Zimbra Collaboration email server with an aim to collect their login credentials for use in follow-on operations. The activity, active since April 2023 and still ongoing, targets a wide range of small and medium businesses and governmental entities, most of which are located in Poland, Ecuador, Mexico, Italy, and Russia. It has not been attributed to any known threat actor or group. "Initially, the target receives an email with a phishing page in the attached HTML file," ESET researcher Viktor Šperka said in a report. "The email warns the target about an email server update, account deactivation, or similar issue and directs the user to click on the attached file." The messages also spoof the from address to appear as if they are coming from a Zimbra administrator in a likely attempt to convince the recipients into opening the attachment. The HTML file contains a Zimbra login page...