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Ransomware group profile · #664 by claimed victims

U-Bomb ransomware

U-Bomb is a low-profile ransomware operation discovered in March 2023 that arrives via phishing emails and uses third-party offensive frameworks (BRC4, Sliver, Cobalt Strike) for lateral movement before deploying its encryptor, likely becoming inactive in the second half of 2023.

Defunct First seen Sep 2026
0Victims claimed on leak sites
0Victims in the last 30 days
0Victims in the last 90 days
0Countries hit
1Leak-site URLs tracked, 0 online
—Latest claim recorded

Tactics, techniques and procedures

ATT&CK technique mapping for U-Bomb is in progress. Victimology, infrastructure status and leak-site tracking are live above.

Indicators, detections and the full playbook

Hashes, C2 addresses, onion services, Sigma and YARA detections per technique, and the negotiation transcripts are available to signed-in analysts.

See full IOCs

Frequently asked

Is U-Bomb ransomware still active?
U-Bomb is tracked as defunct.
How many victims has U-Bomb claimed?
VULONE has recorded 0 leak-site victim claims attributed to U-Bomb, across 0 countries and 0 sectors.
Which industries does U-Bomb target?
Sector data for U-Bomb victims is not yet available.
Which countries are most affected by U-Bomb?
Country data for U-Bomb victims is not yet available.
Where does VULONE get U-Bomb victim data?
Claims are collected continuously from the group's own leak sites and cross-checked with ransomware.live and RansomLook. A claim is the group's assertion, not a confirmed breach.

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Victim claims are collected from leak sites and enrichment partners (ransomware.live, RansomLook) and represent the group's own assertions, not confirmed breaches. Profile last updated 16 September 2026. Questions or corrections: [email protected].