After I read a thread created by Yaunfitda titled :
Coyote malware stealing banking and crypto information there is another vulnerabilities on Microsoft applications where attackers target Microsoft's SharePoint platform to exploit software vulnerabilities to gain unauthorized access to steal data stored in Microsoft SharePoint. More information about the Microsoft Sharepoint attack here:
What we know about the Microsoft SharePoint attacksAttack : Microsoft Sharepoint Vulnerabilities attack
Target: Steal Global users' information and important document data (password, banking account credentials, crypto information)
Perpetrators: China-backed state actors, Linen Typhoon and Violet Typhoon, participating in the initial attack wave.
This is another reason why one should not save their private information or important data especially seed phrases, bank account information and all other sensitive data, in online storage or any cloud shared environment.
It appears Microsoft SharePoint is used by a company, as I have never personally seen anyone using it, and neither have I.
Based on the references you mentioned, I believe the exploiter exploited a vulnerability in the released incomplete patches. Given that the application is used by a company, this would be extremely dangerous for its users, as we know there is the potential for significant data theft. Fortunately, Microsoft has released comprehensive security updates for its users, preventing this potential threat.
In addition, they also stated that their users or customers should configure Antimalware Scan Interface integration after upgrades, rotate SharePoint server ASP.NET machine keys, and then restart Internet Information Services on all SharePoint servers. This is because the attack involved stealing machine keys, which could grant permissions or access to computer systems after patched. I think this is very important to note, especially for the users, Cmiiw.