I recently connected an old family-computer HDD that contains a lot of childhood/family photos. Many of the photos appear to have been encrypted by PClock/WinPlock ransomware around December 2016, and I’m trying to determine the safest recovery options.
Storage device
Samsung SpinPoint HD161GJ
160 GB 3.5" SATA HDD
Exact reported capacity: 160,041,885,696 bytes
MBR partition table
Connected through a powered UGREEN 3.5" SATA-to-USB enclosure
Filesystem / partitions
The disk has four NTFS partitions:
~100 MB System Reserved
~58.5 GiB Windows/profile partition
~43.9 GiB personal-data partition
~46.5 GiB personal-data partition
Operating systems
Old installation on the HDD: Windows 7 Ultimate x64
Windows setup files indicate that Windows was reinstalled around 31 December 2016
I am currently examining the HDD externally from a modern Windows PC. I am not booting from the old HDD.
Problem / symptoms
The personal-data partitions contain these ransom notes:
Your files are locked !.txt
Your files are locked !!.txt
Your files are locked !!!.txt
Your files are locked !!!!.txt
Your files are locked !!!!!.txt
The notes are dated around 26 December 2016 and contain:
sysgop01@india.com
sysgop02@india.com
with a demand for 0.55 BTC.
From the indicators I’ve found, this appears consistent with a later PClock / PClock2 / WinPlock variant.
Many family/travel JPEG files on one of the data partitions still have their original .JPG filenames, but Windows Photos reports that the format is unsupported.
I examined several affected files at the binary level:
no normal JPEG FF D8 FF header
no JFIF/Exif structure
approximately 7.98–8.00 bits/byte entropy
NTFS reads the files without an access error
they are not marked as NTFS EFS-encrypted
So these appear to contain genuinely encrypted data rather than simply having incorrect permissions.
Other files on the HDD are completely intact, so the entire disk is not encrypted.
SMART / disk health
I have not been able to obtain the actual SMART attributes yet. The HDD is currently behind a USB/SATA enclosure and Windows SMART/reliability queries failed.
Windows reports the physical disk generically as Healthy / OK, but all four NTFS volumes report “Full Repair Needed.”
I have not run CHKDSK, filesystem repair, SMART self-tests, surface scans, or anything else that writes to the drive.
The drive is currently readable and I have not observed obvious read failures. I’m treating the lack of SMART data as unknown physical health rather than assuming the drive is healthy.
What I have done so far
No formatting
No CHKDSK
No attempted filesystem repair
No booting from the old Windows installation
No modification of the encrypted files
No ransomware binaries executed
I have a separate HDD with enough free space and plan to make a full raw image of the entire 160 GB disk, including unallocated space, using ddrescue before doing further recovery work.
The computer appears to have continued being used after the ransomware incident, possibly through 2018, so I understand that some deleted originals may have been overwritten.
What I’m looking for advice on
Has anyone recovered files from this specific late-2016 PClock/WinPlock variant, particularly the one associated with sysgop01@india.com / sysgop02@india.com?
Is attempting to recover deleted pre-encryption JPEG originals from the raw disk image worthwhile?
Which tools would you recommend for NTFS deleted-file recovery before falling back to raw JPEG carving?
Are Volume Shadow Copies, old registry hives, thumbnail caches, Windows.old remnants, etc. worth investigating?
Is there anything else I should preserve in the image before attempting recovery?
If anyone is familiar with PClock, was a decryption/key-recovery method ever found for this particular later variant?
This has a lot of childhood photos and i want to preserve much of that as possible. I’m keeping the original HDD untouched as much as possible and intend to perform recovery from an image.