ISC StormCast for Tuesday, November 23rd, 2021

Simple YARA Rules for Office Maldocs
https://isc.sans.edu/forums/diary/Simple+YARA+Rules+for+Office+Maldocs/28062/
Retailers Urged to Patch Magento
https://www.theregister.com/2021/11/22/ncsc_magento_updates_black_friday_reminder/
PoC of CVE-2021-42321: pop mspaint.exe on the target
https://gist.github.com/testanull/0188c1ae847f37a70fe536123d14f398
BeC Via Exchange Flaws
https://www.trendmicro.com/en_us/research/21/k/Squirrelwaffle-Exploits-ProxyShell-and-ProxyLogon-to-Hijack-Email-Chains.html
Windows Priv. Escalation PoC
https://github.com/klinix5/InstallerFileTakeOver
PHP deserialize vulnerablity in CloudLinux Imunity360
https://blog.talosintelligence.com/2021/11/vulnerability-spotlight-php-deserialize.html