- Manpower says it detected an incident in late 2024
- Almost 145,000 people had sensitive files stolen
- Users should beware of scams and identity theft activity
Staffing giant Manpower has confirmed it suffered a cyberattack in late 2024 in which it lost sensitive data on almost 145,000 people.
The company has filed with the Office of the Maine Attorney General, detailing the breach, what it did to mitigate the threat, and how it helped its victims minimize the threat of follow-up attacks.
In the form, it said it spotted the attack while investigating an IT incident on January 20, noting, “Through that investigation, we learned of information suggesting that an unknown actor gained unauthorized access to our network between December 29, 2024 and January 12, 2025 and potentially acquired certain files, some of which may have contained certain individuals’ personal information.”
Escalating privileges
“On or about July 28, 2025, Manpower of Lansing learned that your personal information may have been involved in connection with the incident which is the reason for this notification.”
In total, 144,189 people have been affected by the attack. Manpower did not say who was behind the incident, or what type of information was stolen.
However, BleepingComputer discovered that RansomHub, a known ransomware group and extortionist, claimed responsibility.
On their data leak website, RansomHub said it stole some 500GB of data, including client databases with personal and corporate information (passport scans, IDs, SSNs, addresses, contact information, and more), a lot of corporate communications, financial statements, confidential contracts, non-disclosure agreements, and more.
However, the leaksters also later removed Manpower from their website, suggesting that the company paid the ransom demand. In the meantime, affected customers were offered free credit monitoring and identity theft protection through Equifax.
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