System32 rundll32 exe
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These LoL-ware binaries have incredible abilities to run scripts stealthily. Where Is This Going? Lol-Ware Post-Exploitation! Beware: you’re flooded with event details.
#SYSTEM32 RUNDLL32 EXE WINDOWS#
You can turn on granular logging in Windows to see command line details. I took a peek at the event logs, and thankfully Windows logs the complete command line when the JavaScript is passed directly to rundll32. AppLocker can’t stop rundll32 from running a remote COM object.Īs before, I had enabled more granular auditing. It ran flawlessly even though AppLocker disabled scripts. Similar to what I did last time with mashta. I also gave rundll32 slightly more complicated JavaScript that pulls in a remote object and execute it using GetObject. In my own experimenting, I was able to confirm that rundll32 can avoid AppLocker’s security defenses.įor example, AppLocker blocked direct execution of a line of JavaScript to pop-up an alert message, but when I fed it the same one-liner directly into rundll32, it ran successfully AppLocker is not perfect. Oddvar Moe, one of this blog’s favorite security bloggers, has studied the LoLs workarounds to AppLocker. In other words, hackers can leverage a signed Windows binary to run handcrafted scriptware directly from a command line even though AppLocker officially prevents it. Like mshta, rundll32 has the ability to evade the security protections in AppLocker. I can play a similar trick with another LoL-ware binary, our old friend rundll32. When we left off last, I showed how it’s possible to run VBScript directly from mshta. The Malware Hiding in Your Windows System32 Folder: More Rundll32 and LoL Security Defense Tips.The Malware Hiding in Your Windows System32 Folder: More Alternate Data Streams and Rundll32.The Malware Hiding in Your Windows System32 Folder: Certutil and Alternate Data Streams.The Malware Hiding in Your Windows System32 Folder: Mshta, HTA, and Ransomware.The Malware Hiding in Your Windows System32 Folder: Intro to Regsvr32.Master Fileless Malware Penetration Testing!.
#SYSTEM32 RUNDLL32 EXE SERIES#
This article is part of the series "Living off the Land With Microsoft".