// CONFIRMED RANSOMWARE ATTACKS · COUNTRY
Ransomnews has confirmed 26 ransomware attacks in Thailand between June 2020 and May 2026, each one verified against a public source such as a breach notification, regulatory filing, court record or press report. That is 0.3% of the 9,520 confirmed incidents in the dataset. So far in 2026, 4 have been confirmed, against 4 in 2025 and 3 in 2024. The most affected sector is other, with 5 confirmed victims (19%). Bangkok is the city with the most confirmed victims, at 18. Where the operator is attributed, ALTDOS leads with 2 confirmed victims. No ransom payment is on the public record; a refusal is recorded in 2 cases and the outcome is unrecorded in the remaining 24.
Confirmed ransomware attacks in Thailand by year
The current year is a partial count. Confirmation lags the attack itself, so recent months keep filling in after the fact; read a low figure for the latest year as incomplete rather than as a decline.
| Year | Confirmed attacks | Ransom paid (public) | Ransom refused (public) |
|---|---|---|---|
| 2020 | 6 | 0 | 1 |
| 2021 | 4 | 0 | 1 |
| 2022 | 1 | 0 | 0 |
| 2023 | 4 | 0 | 0 |
| 2024 | 3 | 0 | 0 |
| 2025 | 4 | 0 | 0 |
| 2026 (year to date) | 4 | 0 | 0 |
Which ransomware groups attack organisations in Thailand most
The operator is attributed in 21 of the 26 confirmed incidents. Counts are confirmed victims, not leak-site claims, so they run well below the totals the groups publish about themselves. Group names link to the live Ransomtracker profile where one exists.
Most active groups by confirmed victims
Where the confirmed attacks in Thailand fall
Most affected sectors
Cities with the most confirmed victims
Ransom payment outcomes in Thailand
Among the 2 confirmed incidents in Thailand where the outcome is on the public record, 0 paid and 2 refused, a disclosed payment rate of 0%. The remaining 24 carry no public statement either way. Victims that pay have every incentive to stay quiet and public bodies are the most likely to announce a refusal, so treat this as the disclosed rate, not the true one. The ransomware payment rate analysis explains how the disclosed rate has moved since 2018 and how it compares with incident-response firm samples.
Largest confirmed ransomware attacks in Thailand by records exposed
Record counts are recorded only where a named source disclosed them, which is the minority of cases, so this table ranks disclosed impact rather than true impact.
| Date | Organisation | Sector | Location | Records | Group | Ransom paid | Source |
|---|---|---|---|---|---|---|---|
| September 2022 | THE iCON GROUP | Other | Bangkok, Thailand | 264,128 | Desorden | Unknown | databreaches.net |
| September 2021 | Bhumirajanagarindra Kidney Institute Hospital | Healthcare | Bangkok, Thailand | 40,000 | SunCrypt | No | databreaches.net |
Most recent confirmed ransomware attacks in Thailand
The 25 most recently confirmed of 26 incidents, newest first. Every row links to the public source it was verified against.
| Date | Organisation | Sector | Location | Records | Group | Ransom paid | Source |
|---|---|---|---|---|---|---|---|
| May 2026 | Bangkok Metropolitan Administration | Government | Bangkok, Thailand | — | KRYBIT | Unknown | thaipr.net |
| May 2026 | NaRaYa | Manufacturing | Nonthaburi, Thailand | — | Lamashtu | Unknown | shopify-cache.cartkitcdn.com |
| April 2026 | Unipest Co., Ltd. | Service | Nonthaburi, Thailand | — | KRYBIT | Unknown | facebook.com |
| February 2026 | Sasin School of Management | Education | Bangkok, Thailand | — | The Gentlemen | Unknown | sasin.edu |
| December 2025 | Siam Okamura International Co., Ltd. | Manufacturing | Bangkok, Thailand | — | DragonForce | Unknown | okamura.co.th |
| December 2025 | Bangchak Corporation Public Company Limited | Other | Bangkok, Thailand | — | Qilin | Unknown | bangchak.co.th |
| September 2025 | Thai Diamond & Zebra Electric Co., Ltd. | Manufacturing | Tambon Bang Samak, Thailand | — | — | Unknown | diaelec-hd.co.jp |
| July 2025 | Ministry of Labour | Government | Bangkok, Thailand | — | Devman | Unknown | x.com |
| October 2024 | Siam Daikin Sales Co., Ltd. | Retail | Bangkok, Thailand | — | Qilin | Unknown | daikin.co.th |
| September 2024 | Hanwa Thailand Co., Ltd. | Retail | Bangkok, Thailand | — | Brain Cipher | Unknown | hanwa.co.jp |
| March 2024 | JVCKENWOOD Optical Electronics (Thailand) Co., Ltd. (JVC Kenwood Co, Ltd.) | Technology | Nong Bua Sala, Thailand | — | Medusa | Unknown | jvckenwood.com |
| December 2023 | Udon Thani Hospital | Healthcare | Ban Lueam, Thailand | — | — | Unknown | thansettakij.com |
| July 2023 | Daicel Safety Systems (Thailand) Co., Ltd. | Healthcare | Prachinburi, Thailand | — | — | Unknown | daicel.com |
| July 2023 | Internet Thailand PLC (INET) | Technology | Bangkok, Thailand | — | — | Unknown | bangkokpost.com |
| June 2023 | Thai Reinsurance Public Company Limited | Finance | Bangkok, Thailand | — | RA World | Unknown | thaire.co.th |
| September 2022 | THE iCON GROUP | Other | Bangkok, Thailand | 264,128 | Desorden | Unknown | databreaches.net |
| October 2021 | Central Group (Centara Hotels & Resorts) | Other | Bangkok, Thailand | — | Desorden | Unknown | cybotsai.com |
| September 2021 | Bhumirajanagarindra Kidney Institute Hospital | Healthcare | Bangkok, Thailand | 40,000 | SunCrypt | No | databreaches.net |
| August 2021 | Bangkok Airways | Transportation | Bangkok, Thailand | — | LockBit | Unknown | theregister.com |
| May 2021 | AXA Asia | Finance | Bangkok, Thailand | — | Avaddon | Unknown | portswigger.net |
| December 2020 | Country Group Securities (CGSEC) | Finance | Bangkok, Thailand | — | ALTDOS | Unknown | databreaches.net |
| November 2020 | Mono Next Public Company Limited | Other | Nonthaburi, Thailand | — | ALTDOS | Unknown | databreaches.net |
| September 2020 | Saraburi Hospital | Healthcare | Saraburi, Thailand | — | — | No | bangkokpost.com |
| September 2020 | Red Planet Hotels | Other | Bangkok, Thailand | — | Netwalker | Unknown | i-secure.co.th |
| July 2020 | Thai Beverage Public Company Limited (Thai Bev) | Food and Beverage | Bangkok, Thailand | — | Maze | Unknown | cyware.com |
Frequently asked questions
How many ransomware attacks in Thailand have been confirmed?
Ransomnews has confirmed 26 ransomware attacks in Thailand since June 2020, including 4 so far in 2026. Each one is verified against a public source such as a breach notification, regulatory filing or press report. The true total is higher, because many victims never disclose; confirmed counts are a floor, not a ceiling.
Which ransomware group is most active in Thailand?
ALTDOS, with 2 confirmed victims, followed by Desorden (2) and KRYBIT (2). These are confirmed victims, not leak-site claims, counted among the 21 incidents where the operator is attributed.
Which sector is hit most by ransomware in Thailand?
Other, with 5 confirmed incidents (19% of the total). Healthcare follows with 4, then Finance with 3.
Which cities in Thailand have the most confirmed ransomware attacks?
Bangkok (18), Nonthaburi (3), Ban Lueam (1), Nong Bua Sala (1), Prachinburi (1). City is recorded where the victim organisation is headquartered or the incident was reported, so distributed organisations are counted once.
How often do ransomware victims in Thailand pay the ransom?
Among the 2 confirmed incidents in Thailand with a public outcome, 0 paid and 2 refused, a disclosed payment rate of 0%. Most victims never state whether they paid, and those who pay have the least reason to say so, so the disclosed rate understates real payment behaviour. The payment rate analysis tracks this figure since 2018.
What is the largest confirmed Thailand ransomware attack by records exposed?
THE iCON GROUP (Bangkok, Thailand, September 2022), with 264,128 records exposed according to databreaches.net. Record counts exist only where a source disclosed them, so this ranks disclosed impact.
How to read this page. Every incident counted here was verified by Ransomnews against at least one public source. Leak-site listings alone do not qualify, because operators inflate, duplicate and occasionally fabricate claims, so these totals are a defensible floor rather than a full census. Records exposed and ransom outcomes appear only where a named source disclosed them. The page is regenerated from the live database, which refreshes weekly. Cite as: Ransomnews Confirmed Ransomware Attacks Dataset, ransomnews.com, with a link to this page. Bulk access and methodology questions: [email protected]. See also the monthly ransomware statistics and the Ransomtracker.