https://arstechnica.com/information-technology/2018/07/stolen-certificates-from-d-link-used-to-sign-password-stealing-malware/

Criminals recently stole code-signing certificates from router and camera maker D-Link and another Taiwanese company and used them to pass off malware that steals passwords and backdoors PCs, a researcher said Monday.

The certificates were used to cryptographically verify that legitimate software was issued by D-Link and Changing Information Technology. Microsoft Windows, Apple’s macOS, and most other operating systems rely on the cryptographic signatures produced by such certificates to help users ensure that executable files attached to emails or downloaded on websites were developed by trusted companies rather than malicious actors masquerading as those trusted companies.