CryptoWall was a financially-motivated ransomware operation that emerged in June 2014 and became one of the most prolific ransomware families of its era, generating millions in ransom payments before largely disappearing from the threat landscape. The group operated independently rather than as a RaaS model and was suspected to have origins in Eastern Europe, though definitive attribution remains unclear. CryptoWall primarily gained initial access through exploit kits, malicious email attachments, and drive-by downloads, employing strong RSA encryption to lock victims' files while implementing data exfiltration capabilities in later versions to pressure victims into payment. The ransomware evolved through multiple versions (CryptoWall 1.0 through 4.0), with each iteration becoming more sophisticated in its evasion techniques and encryption methods, targeting critical infrastructure sectors including government facilities, emergency services, and healthcare organizations primarily in the United States. CryptoWall was responsible for infecting hundreds of thousands of systems worldwide and extorting an estimated $18 million from victims according to FBI reports, with law enforcement agencies issuing multiple advisories about the threat throughout 2014-2016. The group's activity significantly declined by 2017 and they are now considered defunct, likely displaced by more modern ransomware operations. The group has been linked to 4 public disclosures across our corpus. First observed on a leak site on June 5, 2014; most recent post February 26, 2016. The operation is currently inactive.
Sector and geography
This disclosure adds to ransomware activity in the Healthcare and Public Health sector, which has 54 disclosures indexed across all operators we track. Geographically, The Arc of Winnebago, Boone and Ogle Counties is reported in United States, a country with 11,033 ransomware disclosures in our corpus.
If your organisation is affected
A listing by cryptowall means The Arc of Winnebago, Boone and Ogle Counties appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.
- Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
- Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
- Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
- Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
- Monitor for the data appearing on cryptowall's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.
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.
