RGDoor

Malware Profile Updated 3 months ago
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RGDoor is a malware that provides backdoor access to the compromised server, allowing hackers to regain access to the server in the event that other methods are removed. It is an IIS HTTP module that checks all inbound POST requests for commands, meaning that an actor does not need to use one specific URL to interact with RGDoor. The IPS Signature RGDoor.Gen Command and Control Traffic (ID 11885) detects RGDoor network traffic. The command used to install RGDoor was confirmed to have successfully installed the backdoor in a test environment, using the specific command shown in Figure 1. To see inbound RGDoor requests, an administrator must configure logging of Cookie fields in IIS, as by default, IIS does not log the values within Cookie fields of inbound HTTP requests, which would contain commands issued by actors to RGDoor. Figure 2 shows the RGDoor DLL (HTTPParser.dll) was loaded into IIS using the module name HTTPParser. The fact that RGDoor is an IIS HTTP module suggests that there is no visual representation of the shell for actors to interact with, which also differs from TwoFace’s interface that actors can interact with by visiting the URL to the TwoFace ASPX file.
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Backdoor
Webshell
Iis
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Source Document References
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SourceCreatedAtTitle
MITRE
a year ago
OilRig uses RGDoor IIS Backdoor on Targets in the Middle East