Hack history / 2021 / Hack or exploit
UL
Hack or exploit on Feb 19, 2021 · Ransomware
ONE SOURCE · 1 SOURCE
Lost
undisclosed
dollars at the time
Returned
none listed
as the sources state it
Rank
not ranked
collapses, frauds and later news are not ranked
What happened
UL LLC (commonly known as Underwriters Laboratories) suffered a ransomware attack that encrypted its server and caused the server to shut down the system when it recovered. To prevent the attack from spreading further, the company shut down the system so that certain employees could not perform their work. According to sources familiar with the attack, UL decided not to pay the ransom, but to restore from backup.
Details
- Date
- Feb 19, 2021
- Kind
- Hack or exploit
- Method
- Ransomware
- How in
- Keys, accounts and infrastructure
- Target
- not stated
- Chains
- not stated
After the theft
- Recovered or seized
- yes, amount not stated
“UL LLC (commonly known as Underwriters Laboratories) suffered a ransomware attack that encrypted its server and caused the server to shut down the system when it recovered.” (SlowMist Hacked)
Reported by
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Cite this page
SwanBluechip, "UL hack, Feb 19, 2021: undisclosed lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htde436b54a3/ (data as of 2026-11-01).