Guerrero Mears LLP Ransomware Attack

gmllp.com

cephalusGroup

United StatesCountry

Aug 26, 2025Discovered

Data has been published on the ransomware group's leak site.

Overview

View group profile

Domain

gmllp.com

Industry

Professional Services

Country

United States

Discovered

11 months ago

Attack date

Aug 26, 2025

Confidence

100%

Severity

Critical

Status

Data Leaked

Threat group

cephalus

Total victims

First seen

Aug 2025

Last seen

Aug 2025

Group status

active

Sophistication

Impact score

Threat level

4.4/10

Aggressiveness5/10

Lethality2.6/10

Criticality5.9/10

Status breakdown

Data Leaked

this victim

52.0%13

Targeted sectors

Financial Services Government & Defense Healthcare Manufacturing Other Professional Services Technology

Victim's position within group

Industry

Professional Services

Known target sector

Country

United States

Frequently targeted country

Other victims

View all (25)

Same group · cephalus

One-LUX
United Kingdom
Unknown
Shropdoc
United Kingdom
Unknown
Shelbourne Accountants
Ireland
Unknown
Delta Information Systems
United States
Unknown
Colorado Health Network Inc
United States
Unknown
Texas Pregnancy Care Network
United States
Unknown

Group activity

Monthly attacks · cephalus

total · avg 25/mo