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Threat Group Cards: A Threat Actor Encyclopedia

Permanent link Tool: Jaff

NamesJaff
Rakhni
CategoryMalware
TypeRansomware
Description(Fortinet) Like many ransomware variants, Jaff ransomware commonly arrives as a pdf attachment. Once you open the attachment, it displays a one-line document along with a pop-up message asking whether you want to open an embedded.

After downloading the binary file, Jaff ransomware starts decrypting part of the malware code. It uses a simple code redirection routine as an anti-analysis trick to stretch the time it requires to analyze the actual malicious code. In between code execution, it uses garbage code that is not relevant to the malware execution.
Information<https://www.fortinet.com/blog/threat-research/looking-into-jaff-ransomware.html>
<http://malware-traffic-analysis.net/2017/05/16/index.html>
<https://www.proofpoint.com/us/threat-insight/post/jaff-new-ransomware-from-actors-behind-distribution-of-dridex-locky-bart>
<http://blog.talosintelligence.com/2017/05/jaff-ransomware.html>
Malpedia<https://malpedia.caad.fkie.fraunhofer.de/details/win.jaff>
AlienVault OTX<https://otx.alienvault.com/browse/pulses?q=tag:jaff>
Playbook<https://www.nomoreransom.org/uploads/RakhniDecryptor_how-to_guide.pdf>

Last change to this tool card: 24 April 2021

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All groups using tool Jaff

ChangedNameCountryObserved

APT groups

 TA505, Graceful Spider, Gold EvergreenRussia2006-Oct 2020X

1 group listed (1 APT, 0 other, 0 unknown)

Thailand Computer Emergency Response Team (ThaiCERT)
Electronic Transactions Development Agency

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