Client was hit with CryptoWall 3.0 last week. They very quickly identified the PC that had been compromised and disconnected it from the network. They then wiped that PC and rebuilt it.
The user of that PC was an Office Admin and had very little access to the network so only about 4,000 files for encrypted and are not inaccessible.
The client has gone ahead with the purchase of Bit Coin and paid the $500 ransom. They were given a download link for the decryption process. They ran a virus scan on the ZIP file they were given and sure enough the 'decrypt.exe' file was infected with a Trojan and their AV tool removed it from the ZIP. What is left in the ZIP is the 'public.key' and 'private.key' files.
Unfortunately their IT had misconfiguration their backups an they do not have a recent enough copy of these files. The files they need are business critical.
Is there any way for the files to be decrypted with other software, now that they have the private.key file?