**Coldlock** is a relatively obscure ransomware group that first emerged in March 2020, operating with apparent financial motivations. The group has maintained a low profile with limited documented activity, having been linked to only three known victim organizations. Little is publicly documented about Coldlock's country of origin or operational structure, though their targeting patterns suggest a focus on critical infrastructure sectors. The group primarily targets organizations in the United States, with a particular emphasis on the energy sector as well as healthcare and public health organizations. Limited public reporting from established security firms means their specific attack methodologies, encryption techniques, and initial access vectors remain largely undocumented in mainstream threat intelligence sources. No major high-profile campaigns or significant law enforcement actions against Coldlock have been publicly reported by CISA, FBI, or major security research organizations. Due to the sparse public documentation and limited victim count since 2020, it is unclear whether the group remains active, has ceased operations, or operates under a different name. The group has been linked to 3 public disclosures across our corpus. First observed on a leak site on March 19, 2020; most recent post May 5, 2020. The operation is currently inactive.
Sector and geography
This disclosure adds to ransomware activity in the Healthcare and Public Health sector, which has 52 disclosures indexed across all operators we track. Geographically, Moorestown Visiting Nurse Association 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.
