Was Správa služeb hlavního města Prahy hit by ransomware?

Správa služeb hlavního města Prahy was listed by the Cicada3301 ransomware operation (Czech Republic), 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 Cicada3301 ransomware group?

Cicada3301 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 Správa služeb hlavního města Prahy breach?

Cicada3301 published data attributed to Správa služeb hlavního města Prahy (~200 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Správa služeb hlavního města Prahy

Claimed by Cicada3301 · listed 1 year ago

200 GB

Data size

15m

Age

since listed · data leaked

Status timeline

ListedApr 10, 2025
Data leakeddate unknown

At a glance

Group: Cicada3301
Status: Data leaked
Country: Czech Republic
Sector: Public Sector
Listed on leak site: Apr 10, 2025
Data size: 200 GB

About the victim

AI dossier — public-source company profile

Správa služeb hlavního města Prahy (Prague City Services Administration) is a municipal public sector organization in Prague, Czech Republic, responsible for managing city services including vehicle towing operations, emergency shelters, flood protection measures, and civil defense facilities.

Industry: Public Administration & Municipal Services
Address: Prague, Czech Republic

Attack summary

Severity: high — Confirmed exfiltration of 200 GB from a critical municipal government agency responsible for emergency services, civil defense, and flood protection. Exposure of government operational data and civil protection infrastructure information poses significant risk to public safety and administrative continuity.

Cicada3301 claims to have exfiltrated 200 GB of data from the Prague City Services Administration. The group has published the data; no ransom demand is stated.

high

Data the group says was taken

AI dossier — extracted from the leak post

Municipal administrative records
Operational data
Vehicle/towing system information
Potentially personal identification documents
Civil protection facility information

What the group claims

Status: 29d 13h 39m 0s - Size Data: 200 GB

Sources

Victim sitesshmp.cz
Leak posthttp://cicadabv7vicyvgz5khl7v2x5yygcgow7ryy6yppwmxii4eoobdaztqd.onion/iedaqzkhicspl0hnma73rvg65ek4yydp

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.

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Disclosure context

About Cicada3301

Cicada3301 is a recently emerged ransomware group that began operations in June 2024, primarily motivated by financial gain through extortion activities targeting organizations across multiple sectors. The group's origin and affiliations remain largely undocumented in public threat intelligence reporting, with limited information available regarding their operational structure or potential connections to other cybercriminal organizations. Based on observed targeting patterns, Cicada3301 has demonstrated a preference for attacking business services, technology, manufacturing, and financial sector organizations, with their operations concentrated primarily in English-speaking countries including the United States, United Kingdom, and Canada, as well as extending to Spain and Singapore. The group has successfully compromised approximately 75 known victims since their emergence, though specific details regarding their attack methodologies, initial access vectors, encryption techniques, and extortion tactics have not been extensively documented in publicly available threat intelligence reports from major cybersecurity firms or government agencies. Given the limited public documentation available from CISA, FBI, Mandiant, or other reputable security researchers, the group's current operational status, technical capabilities, and specific attack infrastructure remain largely uncharacterized in open-source intelligence reporting. As of the most recent observations, Cicada3301 appears to remain active in conducting ransomware operations, though comprehensive analysis of their tactics, techniques, and procedures awaits more detailed public reporting from established threat intelligence sources. The group has been linked to 75 public disclosures across our corpus. First observed on a leak site on June 20, 2024; most recent post September 4, 2025. The operation is currently inactive.

Timeline of this disclosure

April 10, 2025Správa služeb hlavního města Prahy listed by Cicada3301on the group's public leak site

Data size: 200 GB

Other recent disclosures by Cicada3301

Cicada3301 has been linked to 75 public victims on Darkfield. A sample of the most recent:

See the full Cicada3301 dossier →

Sector and geography

This disclosure adds to ransomware activity in the Public Sector sector, which has 466 disclosures indexed across all operators we track. Geographically, Správa služeb hlavního města Prahy is reported in Czech Republic, a country with 34 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Cicada3301 means Správa služeb hlavního města Prahy 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.
Monitor for the data appearing on Cicada3301'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.