SANS Stormcast Monday, August 25th, 2025: IP Cleanup; Linux Desktop Attacks; Malicious Go SSH Brute Forcer; Onmicrosoft Domain Restrictions

SANS Internet Stormcenter Daily Cyber Security Podcast (Stormcast)

The end of an era: Properly formatted IP addresses in all of our data.
When initiall designing DShield, addresses were zero padded , an unfortunate choice. As of this week, datafeeds should no longer be zero padded .
https://isc.sans.edu/diary/The%20end%20of%20an%20era%3A%20Properly%20formated%20IP%20addresses%20in%20all%20of%20our%20data./32228
.desktop files used in an attack against Linux Desktops
Pakistani attackers are using .desktop files to target Indian Linux desktops.
https://www.cyfirma.com/research/apt36-targets-indian-boss-linux-systems-with-weaponized-autostart-files/
Malicious Go Module Disguised as SSH Brute Forcer Exfiltrates Credentials via Telegram
A go module advertising its ability to quickly brute force passwords against random IP addresses, has been used to exfiltrate credentials from the person running the module.
https://socket.dev/blog/malicious-go-module-disguised-as-ssh-brute-forcer-exfiltrates-credentials
Limiting Onmicrosoft Domain Usage for Sending Emails
Microsoft is limiting how many emails can be sent by Microsoft 365 users using the onmicrosoft.com domain.
https://techcommunity.microsoft.com/blog/exchange/limiting-onmicrosoft-domain-usage-for-sending-emails/4446167