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OKQL

PyLocky Decryptor

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This decryptor is intended to decrypt the files for those victims affected by the ransomware PyLocky.

 

This decryptor is built to be executed on Windows systems only and it does require a PCAP of the outbound connection attempt to the C&C servers. This connection is seen seconds after the infection occurs and it will contain, among other info, the Initialization Vector (IV) and a password (both generated randomly at runtime) used to encrypt the files. Without this PCAP containing these values, the decryption won't be possible.

The structure of the outbound connection contains an string like:

PCNAME=NAME&IV=KXyiJnifKQQ%3D%0A&GC=VGA+3D&PASSWORD=CVxAfel9ojCYJ9So&CPU=Intel%28R%29+Xeon%28R%29+CPU+E5-1660+v4+%40+3.20GHz&LANG=en_US&INSERT=1&UID=XXXXXXXXXXXXXXXX&RAM=4&OSV=10.0.16299+16299&MAC=00%3A00%3A00%3A00%3A45%3A6B&OS=Microsoft+Windows+10+Pro

 

Download: https://github.com/Cisco-Talos/pylocky_decryptor

 

Source https://github.com/Cisco-Talos/pylocky_decryptor

Edited by OKQL
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