Iranian Hackers Exploit Log4j Vulnerability to Deploy PowerShell Backdoor

An Iranian state-sponsored actor has been observed scanning and attempting to abuse the Log4Shell flaw in publicly-exposed Java applications to deploy a hitherto undocumented PowerShell-based modular backdoor dubbed “CharmPower” for follow-on post-exploitation. “The actor’s attack setup was obviously rushed, as they used the basic open-source tool for the exploitation and based their operations on previous…

New SysJoker Espionage Malware Targeting Windows, macOS, and Linux Users

A new cross-platform backdoor called “SysJoker” has been observed targeting machines running Windows, Linux, and macOS operating systems as part of an ongoing espionage campaign that’s believed to have been initiated during the second half of 2021. “SysJoker masquerades as a system update and generates its [command-and-control server] by decoding a string retrieved from a…

New SysJoker Espionage Malware Targeting Windows, macOS, and Linux Users

A new cross-platform backdoor called “SysJoker” has been observed targeting machines running Windows, Linux, and macOS operating systems as part of an ongoing espionage campaign that’s believed to have been initiated during the second half of 2021. “SysJoker masquerades as a system update and generates its [command-and-control server] by decoding a string retrieved from a…