Based on available public documentation, Keyholder is an obscure ransomware operation that was first observed in April 2015, with limited documented activity suggesting primarily financially motivated attacks. The group's origin and affiliations remain largely unknown due to minimal public reporting from major security firms and law enforcement agencies, with no clear indication of whether they operate as a Ransomware-as-a-Service model or as an independent entity. Available intelligence indicates extremely limited activity with only one publicly documented victim, suggesting either a highly targeted approach or a short-lived operation that failed to gain significant traction in the ransomware landscape. The group has demonstrated targeting of emergency services sectors within the United States, though the specific attack methodology, tools, and extortion tactics employed remain undocumented in public threat intelligence reporting. Given the sparse public documentation and lack of recent reporting from CISA, FBI, or major security research firms since the initial 2015 observation, the current operational status of Keyholder remains unclear, with the group likely having ceased operations or remaining dormant. The group has been linked to 1 public disclosures across our corpus. First observed on a leak site on April 4, 2015. The operation is currently inactive.
Sector and geography
This disclosure adds to ransomware activity in the Emergency Services sector, which has 9 disclosures indexed across all operators we track. Geographically, Tewksbury Police Department is reported in United States, a country with 7,392 ransomware disclosures in our corpus.
How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.
