Log4j: How hackers are using the flaw to deliver this new ‘modular’ backdoor

Iran-backed hacking group Phosphorous or APT35 is using the Log4j vulnerability to distribute a new modular PowerShell toolkit, according to security firm Check Point. APT35 is one of several state-backed hacking groups known to have been developing tools to exploit public-facing Java applications that use vulnerable versions of the Log4j error-logging component.

Microsoft, which tracks the group as Phosphorous and has called it out for increasingly using ransomware in attacks, found it had operationalized a Log4j exploit for future campaigns less than a week after Log4Shell’s December 9 disclosure.

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