CypherLoc Scareware Targets Users with Fake Microsoft Support Scams

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CypherLoc Scareware Targets Users with Fake Microsoft Support Scams

First seen 25 May 2026, 07:02 UTC • •68.3

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ThreatCluster •May 26, 2026 at 06:34 UTC

•CypherLoc scareware has been linked to 2.8 million attacks in 2026.
•The kit locks browsers and tricks users into calling fake tech support.
•Robust anti-phishing measures and user education are critical for defense.

A new scareware kit named CypherLoc is being used by hackers to lock victims' browsers and direct them to fraudulent Microsoft support lines. This browser-locking scareware has been linked to approximately 2.8 million attacks since the beginning of 2026. CypherLoc operates in an encrypted manner, making it difficult for traditional security tools to detect. Security experts emphasize the need for robust anti-phishing and endpoint protections, as well as user education to combat this threat. The kit represents a significant escalation in browser-based attacks, posing risks to a wide range of internet users. Organizations are advised to implement stronger security measures to mitigate the impact of such threats.

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Updated 121d ago How this analysis works

Timeline

2026-01-01

CypherLoc scareware identified

Researchers first identified the CypherLoc kit as a significant browser-based threat targeting users.

2026-05-25

2.8 million attacks reported

Barracuda researchers reported that CypherLoc has been involved in approximately 2.8 million attacks since early 2026.

2026-05-25

Security recommendations issued

Experts recommend enhancing anti-phishing and endpoint protections to counteract CypherLoc threats.

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More articles in this cluster (5)

Threat Graph

4 entities, 3 inferred relationships (STIX 2.1).

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Technique (3)

Malware
Phishing
T1566 - Phishing

Malware (1)

CypherLoc

Relationships

CypherLoc related to Malware
CypherLoc related to Phishing
CypherLoc related to T1566 - Phishing

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