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Mantum Holding AB Ransomware Attack

mantum.seRansomed

wallstreetGroup

SwedenCountry

Oct 13, 2026Discovered

Overview

View group profile

Domain

mantum.se

Industry

Other

Country

Sweden

Discovered

1 day ago

Attack date

Oct 13, 2026

Confidence

100%

Severity

Medium

Status

Claimed

Threat group

wallstreet

Total victims

First seen

Jun 2026

Last seen

Oct 2026

Group status

active

Sophistication

Impact score

Threat level

4.9/10

Aggressiveness10/10

Lethality0/10

Criticality4.8/10

Status breakdown

Claimed

this victim

100.0%47

Targeted sectors

Education Energy & Utilities Financial Services Government & Defense Healthcare Manufacturing Other Professional Services Retail & E-Commerce Technology Transportation

Victim's position within group

Industry

Other

Known target sector

Country

Sweden

Frequently targeted country

Other victims

View all (47)

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Green Clinic
United States
Claimed
E-Z Pack Trucks
United States
Claimed
Lambertinum Seniorenwohnanlage
Germany
Claimed
Mantum Holding AB
Sweden
Claimed
Brunnberg & Forshed Arkitektkontor
Sweden
Claimed
Danvikshem (Stiftelsen Danviks Hospital)
Sweden
Claimed

Group activity

Monthly attacks · wallstreet

total · avg 9.4/mo