• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Allianz Life data breach exposed the data of most of its 1.4M customers

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 55

 | 

Security Affairs newsletter Round 534 by Pierluigi Paganini – INTERNATIONAL EDITION

 | 

Law enforcement operations seized BlackSuit ransomware gang’s darknet sites

 | 

Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme

 | 

Operation CargoTalon targets Russia’s aerospace with EAGLET malware,

 | 

Unpatched flaw in EoL LG LNV5110R cameras lets hackers gain Admin access

 | 

Koske, a new AI-Generated Linux malware appears in the threat landscape

 | 

Mitel patches critical MiVoice MX-ONE Auth bypass flaw

 | 

Coyote malware is first-ever malware abusing Windows UI Automation

 | 

SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks

 | 

DSPM & AI Are Booming: $17.87B and $4.8T Markets by 2033

 | 

Stealth backdoor found in WordPress mu-Plugins folder

 | 

U.S. CISA adds CrushFTP, Google Chromium, and SysAid flaws to its Known Exploited Vulnerabilities catalog

 | 

U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog

 | 

Sophos fixed two critical Sophos Firewall vulnerabilities

 | 

French Authorities confirm XSS.is admin arrested in Ukraine

 | 

Microsoft linked attacks on SharePoint flaws to China-nexus actors

 | 

Cisco confirms active exploitation of ISE and ISE-PIC flaws

 | 

SharePoint under fire: new ToolShell attacks target enterprises

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • APT
  • Breaking News
  • Cyber warfare
  • Hacking
  • Intelligence
  • Malware
  • Iran-linked APT OilRig target IIS Web Servers with new RGDoor Backdoor

Iran-linked APT OilRig target IIS Web Servers with new RGDoor Backdoor

Pierluigi Paganini January 28, 2018

The Iran-linked cyber-espionage group tracked as OilRig started using a backdoor subbed RGDoor to target Internet Information Services (IIS) Web servers.

The Iran-linked cyber-espionage group tracked as OilRig started using a backdoor dubbed RGDoor to target Internet Information Services (IIS) Web servers.

The OilRig hacker group is an Iran-linked APT that has been around since at least 2015, when targeted mainly organizations in the financial and government sectors, in the United States and Middle Eastern countries.

The hackers used the RGDoor backdoor to target Middle Eastern government organizations and financial and educational institutions.

According to the researchers, RGDoor is a secondary backdoor that allows the hackers to regain access to a compromised Web server when primary TwoFace webshell is discovered and removed.

OilRig hackers are using the TwoFace webshell since at least June 2016, the backdoor

“Unlike TwoFace, the actors did not develop RGDoor in C# to be interacted with at specific URLs hosted by the targeted IIS web server. Instead, the developer created RGDoor using C++, which results in a compiled dynamic link library (DLL).” states the analysis from PaloAlto Networks.

“The DLL has an exported function named “RegisterModule”, which is important as it led us to believe that this DLL was used as a custom native-code HTTP module that the threat actor would load into IIS.” 

The attackers exploited the IIS 7 functionality that allows developers to create modules in C++ to extend IIS’ capabilities, in this way they could carry out custom actions on requests

The “native-code modules can be installed either in the IIS Manager GUI or via the command-line using the ‘appcmd’ application,” Palo Alto has explains.

OilRig RGDoor

Malware researchers from Paloalto Networks discovered that the code calls the RegisterModule function with arguments that ignore inbound HTTP GET requests, but act on all HTTP POST requests.

When the IIS server receives an inbound HTTP POST request, the backdoor parses the requests searching for the string in HTTP “Cookie” field.

The find was used to issue cmd$ [command to execute], upload$ [path to file], or download$ [path to file] commands.

“RGDoor then constructs its own HTTP response by first setting the “Content-Type” field within the HTTP header to “text/plain”.” continues the analysis.

The choice of the Cookie fields makes it hard to analyze inbound requests related to RGDoor backdoor because IIS does not log the values within these specific fields of inbound HTTP requests by default.

“This backdoor has a rather limited set of commands, however, the three commands provide plenty of functionality for a competent backdoor, as they allow an actor to upload and download files to the sever, as well as run commands via command prompt. The use of RGDoor suggests that this group has contingency plans to regain access to a compromised network in the event their webshells are discovered and remediated.” concluded Palo Alto Networks.

Technical details, including IoCs are reported in the analysis published by PaloAlto Networks.

[adrotate banner=”9″] [adrotate banner=”12″]

Pierluigi Paganini

(Security Affairs – RGDoor backdoor, OilRig)

[adrotate banner=”5″]

[adrotate banner=”13″]


facebook linkedin twitter

APT Iran OilRig RGDoor backdoor state sponsored hackers

you might also like

Pierluigi Paganini July 27, 2025
Allianz Life data breach exposed the data of most of its 1.4M customers
Read more
Pierluigi Paganini July 27, 2025
SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 55
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Allianz Life data breach exposed the data of most of its 1.4M customers

    Data Breach / July 27, 2025

    SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 55

    Malware / July 27, 2025

    Security Affairs newsletter Round 534 by Pierluigi Paganini – INTERNATIONAL EDITION

    Breaking News / July 27, 2025

    Law enforcement operations seized BlackSuit ransomware gang’s darknet sites

    Cyber Crime / July 26, 2025

    Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme

    Intelligence / July 26, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT