Was Seoul Guarantee Insurance hit by ransomware?

Seoul Guarantee Insurance was listed by the gunra ransomware operation (South Korea), 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 gunra ransomware group?

gunra 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 Seoul Guarantee Insurance breach?

gunra published data attributed to Seoul Guarantee Insurance. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Seoul Guarantee Insurance

Claimed by Gunra · listed 11 months ago

11m

Age

since listed · data leaked

Status timeline

ListedAug 18, 2025
Data leakeddate unknown

At a glance

Group: Gunra
Status: Data leaked
Country: South Korea
Sector: Financial Services
Listed on leak site: Aug 18, 2025

About the victim

AI dossier — public-source company profile

Seoul Guarantee Insurance (SGI) is a South Korean financial services company established in 1969 specializing in credit and guarantee insurance for businesses. It offers trade insurance, construction guarantees, surety bonds, credit guarantees, export insurance, and retail insurance products to small and medium-sized enterprises.

Industry: Credit & Guarantee Insurance
Address: Seoul, South Korea
Founded: 1969

Attack summary

Severity: medium — Financial services company with access to sensitive business and customer data; disclosure status confirmed but no proof files, ransom demand, or specific data inventory detailed in the post.

The ransomware group gunra claims to have attacked Seoul Guarantee Insurance and published data. No specific details on encryption status, data exfiltration scope, or operational impact are provided in the disclosed post.

medium

Original description

AI-summarised, not from the leak post

Seoul Guarantee Insurance (SGI) is a South Korean company specializing in credit and guarantee insurance for businesses. It offers insurance cover for trade, construction, and small to medium-sized businesses. It also provides surety bonds, credit guarantees, and financial services. Other services include reinsurance, loan guarantees, export insurance, and retail insurance products. The company was established in 1969 and is based in Seoul, South Korea.

Sources

Victim sitesgic.co.kr
Leak posthttp://gunrabxbig445sjqa535uaymzerj6fp4nwc6ngc2xughf2pedjdhk4ad.onion/#

Source

Indexed 11 months 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 gunra

Gunra is an emerging ransomware group that was first observed in April 2025, operating with primarily financial motivations based on their targeting patterns across multiple high-value sectors. The group's origin and affiliations remain unclear due to limited public documentation from major security vendors, though their geographic targeting suggests possible international operations given their focus on victims across Brazil, South Korea, Japan, Canada, and Egypt. With approximately 20 known victims to date, Gunra appears to follow conventional ransomware attack methodologies typical of financially-motivated cybercriminal groups, though specific technical details regarding their initial access vectors, encryption methods, or use of double extortion tactics have not been publicly documented by major threat intelligence sources. The group demonstrates opportunistic targeting behavior, focusing primarily on manufacturing organizations while also compromising entities in healthcare, technology, and financial services sectors, suggesting they may operate opportunistically rather than with highly specialized sector expertise. Given the recent emergence of this group in April 2025 and limited public reporting from established threat intelligence organizations such as CISA, FBI, or major security vendors, Gunra's current operational status, technical capabilities, and long-term threat trajectory require continued monitoring as more intelligence becomes available. The group has been linked to 46 public disclosures across our corpus. First observed on a leak site on April 23, 2025; most recent post July 10, 2026. The operation is currently active.

Timeline of this disclosure

August 18, 2025Seoul Guarantee Insurance listed by gunraon the group's public leak site

Other recent disclosures by gunra

gunra has been linked to 46 public victims on Darkfield. A sample of the most recent:

See the full gunra dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,184 disclosures indexed across all operators we track. Geographically, Seoul Guarantee Insurance is reported in South Korea, a country with 48 ransomware disclosures in our corpus.

If your organisation is affected

A listing by gunra means Seoul Guarantee Insurance 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, KrCERT/CC (South Korea), as required for your jurisdiction.
Monitor for the data appearing on gunra'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.