An anonymous reader writes: The Necurs botnet has been harnessed to fling a new strain of ransomware dubbed "Jaff". Jaff spreads in a similar way to the infamous file-encrypting malware Locky and even uses the same payment site template, but is nonetheless a different monster. Attached to dangerous emails is an infectious PDF containing an embedded DOCM file with a malicious macro script. This script will then download and execute the Jaff ransomware. Locky -- like Jaff -- also used the Necurs botnet and a booby-trapped PDF, security firm Malwarebytes notes. "This is where the comparison ends, since the code base is different as well as the ransom itself," said Jerome Segura, a security researcher at Malwarebytes. "Jaff asks for an astounding 2 BTC, which is about $3,700 at the time of writing." Proofpoint reckons Jaff may be the work of the same cybercriminals behind Locky, Dridex and Bart (other nasty malware) but this remains unconfirmed. And Forcepoint Security Labs reports that malicious emails carrying Jaff are being cranked out at a rate of 5 million an hour on Thursday, or 13 million in total at the time it wrote up a blog post about the new threat.
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