Disclosure context

About Siegedsec

SiegedSec is a relatively new threat actor that emerged in December 2023, primarily motivated by hacktivism with a strong focus on anti-Israeli sentiment rather than traditional financial gain through ransomware operations. The group appears to operate independently with suspected ideological motivations tied to pro-Palestinian activism, though their exact geographic origin remains unclear based on publicly available intelligence. Unlike traditional ransomware groups, SiegedSec appears to focus on data theft and public exposure of sensitive information rather than encryption-based extortion, primarily targeting Israeli government entities through opportunistic attacks that exploit web application vulnerabilities and exposed credentials. The group has maintained a relatively low profile with 19 documented victims, almost exclusively targeting Israeli government infrastructure in what appears to be coordinated ideological attacks rather than broad financial campaigns. Based on available reporting, SiegedSec remains active as of late 2023 and early 2024, continuing their focused campaign against Israeli targets through data exfiltration and public disclosure operations. The group has been linked to 19 public disclosures across our corpus. First observed on a leak site on December 8, 2023; most recent post December 9, 2023. The operation is currently inactive.

Timeline of this disclosure

December 8, 2023NATO Leak - 1 listed by Siegedsecon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Defense & Aerospace sector. Geographically, NATO Leak - 1 is reported in Belgium, a country with 32 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.

Ransomware victim disclosure

← All victims

NATO Leak - 1

Claimed by Siegedsec · listed 2 years ago

29m

Age

since listed · data leaked

Status timeline

Listed
Dec 8, 2023
Data leaked

At a glance

Group: Siegedsec
Status: Data leaked
Country: Belgium
Sector: Defense & Aerospace
Listed on leak site: Dec 8, 2023

About the victim

AI dossier — public-source company profile

NATO (North Atlantic Treaty Organization) is an intergovernmental military alliance headquartered in Brussels, Belgium, founded in 1949. It comprises 32 member countries and coordinates collective defence policy, military operations, intelligence, and security across the Euro-Atlantic area. Its structures include the North Atlantic Council, the International Staff, the Military Committee, and numerous specialized agencies.

Industry: Intergovernmental Military Alliance & Defence
Address: Boulevard Léopold III, 1110 Brussels, Belgium
Founded: 1949

Attack summary

Severity: critical — The target is a major intergovernmental military alliance whose data inherently includes sensitive defence, intelligence, and geopolitical information; confirmed data publication against a government/defence entity of this scale constitutes a critical disclosure.

SiegedSec claims to have exfiltrated data from NATO systems and published it without demanding a ransom; the post is classified as data_published, indicating the group has released files purportedly obtained from NATO infrastructure.

critical

Data the group says was taken

AI dossier — extracted from the leak post

NATO internal documents
Potentially classified or sensitive alliance data

What the group claims

intergovernmental, military alliance

Sources

Victim sitenato.int
Leak posthttp://nv5p2mmpctvyqdyyi5zwh4gnifq2uxdx4etvnmaheqlrw6ordrjwxryd.onion/post/2.html

Source

Indexed 2 years 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.