Was Derp.org hit by ransomware?

Derp.org was listed by the IMNCrew ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the IMNCrew ransomware group?

IMNCrew is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Derp.org breach?

IMNCrew published data attributed to Derp.org. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Denver Employees Retirement Plan (DERP)

listed as Derp.org · Claimed by IMNCrew · listed 1 year ago

14m

Age

since listed · data leaked

Status timeline

ListedMay 5, 2025
Data leakeddate unknown

At a glance

Group: IMNCrew
Status: Data leaked
Country: United States
Sector: Consumer Services
Listed on leak site: May 5, 2025

About the victim

AI dossier — public-source company profile

The Denver Employees Retirement Plan (DERP) is a defined benefit pension plan established in 1963 to serve City and County of Denver employees. It manages retirement benefits for approximately 10,800 retirees and beneficiaries and nearly 10,000 active members across Career Service, Denver Health and Hospital Authority, and DERP staff.

Industry: Pension & Retirement Plan Administration
Address: Denver, Colorado, United States
Founded: 1963

Attack summary

Severity: high — Pension/retirement plan administrator managing personal financial data (benefit payments, membership records) for thousands of individuals. Even without explicit proof of exfiltration or detailed data inventory in the post, compromise of such an entity poses significant risk to PII and financial records of retirees and active members.

IMNCrew claims to have compromised the DERP organization. The leak post does not specify whether data was exfiltrated, encrypted, or both, nor does it detail what specific data categories are at stake.

high

What the group claims

We’re the Denver Employees Retirement Plan (DERP). Your partner in building, planning, and living a secure retirement future while serving the city you love. DERP was established January 1, 1963, to provide a defined benefit plan for eligible City and County of Denver employees in the Career Service, certain employees of the Denver Health and Hospital Authority, and DERP staff. We provide a monthly DERP Pension Benefit payment to more than 10,800 retirees and beneficiaries, and are an essential element of the future financial security for almost 10,000 active members.

Sources

Victim siteDerp.org
Leak posthttp://imncrewwfkbjkhr2oylerfm5qtbzfphhmpcfag43xc2kfgvluqtlgoid.onion

Source

Indexed 1 year ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About IMNCrew

IMNCrew is a recently emerged ransomware group first observed in May 2025, operating with apparent financial motivations based on their targeting patterns and victim selection. The group's origin and affiliations remain unclear due to limited public documentation, though their geographic targeting suggests potential international operations with no confirmed ties to established ransomware families or known state-sponsored actors. Based on available intelligence, IMNCrew appears to employ traditional ransomware deployment methods targeting organizations across multiple sectors, though specific technical details regarding their initial access vectors, encryption implementations, or data exfiltration capabilities have not been publicly documented by major security researchers or government agencies. The group has compromised approximately 12 known victims primarily across the United States, Sweden, Canada, Mexico, and Indonesia, with notable focus on consumer services, healthcare, financial services, and technology sectors. IMNCrew appears to remain active as of their recent emergence, though comprehensive threat intelligence regarding their operations, infrastructure, and specific attack methodologies requires further documentation from established security research organizations. The group has been linked to 12 public disclosures across our corpus. First observed on a leak site on May 5, 2025; most recent post September 16, 2025. The operation is currently inactive.

Also tracked as: imn crew.

Timeline of this disclosure

May 5, 2025Derp.org listed by IMNCrewon the group's public leak site

Other recent disclosures by IMNCrew

IMNCrew has been linked to 12 public victims on Darkfield. A sample of the most recent:

See the full IMNCrew dossier →

Sector and geography

This disclosure adds to ransomware activity in the Consumer Services sector, which has 829 disclosures indexed across all operators we track. Geographically, Derp.org is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by IMNCrew means Derp.org 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 IMNCrew'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.