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The PLC s PROFIBUS driver is replaced and the main PLC program block (Organizational Block 1) and the primary watchdog block (Organizational Block 35) are significantly modified.

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If Stuxnet finds what it is looking for in the PLC, it starts one of three sequences to inject STEP 7 code into the PLC. If it is able to connect to one of these two models, it finger-prints the PLC by checking for the existence of process configurations and certain strings in the PLC. Stuxnet then looks for specific models of Siemens PLCs (6ES and 6ES7-417). If it succeeds, it replaces the STEP 7 DLL routines, so that any person viewing a PLC s logic would not see any changes Stuxnet later makes to the PLC(s). When installed on a computer, Stuxnet attempts to locate Siemens STEP 7 programming stations and infect these. It takes advantage of at least four zero-day vulnerabilities and shows considerable sophistication in its exploitation of Siemens systems. What does it do? Stuxnet is one of the most complex and well-engineered worms ever seen. While there has been rampant speculation on Stuxnet s intended target, no definitive victim has been identified. Stuxnet appears to be a targeted worm, designed to reprogram and sabotage one or more very specific industrial processes. It also infects the Siemens STEP 7 project files in such a way that it automatically executes when the STEP 7 project is loaded by an uninfected Siemens system.

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It is capable of infecting both unsupported and current versions of Windows including Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008 and Windows 7. October 14,ģ Threat Details What is it? Stuxnet is a computer worm designed to take advantage of a number of security vulnerabilities present in the Windows operating system and Siemens SIMATIC WinCC, PCS7 and S7 product lines. References to Siemens, US-CERT, Symantec and Microsoft have been updated i See the Frequently Asked Questions section for an explanation of zero-day vulnerabilities. Workarounds for operating systems where no patches are available has been integrated into a Prevention/Mitigation section that covers both patchable and non-patchable systems. Two other vulnerabilities that allow escalation of privilege on Windows systems were not patched at the time this White Paper was published. Patches for most (but not all) versions of the Windows operating system are available from Microsoft for three of the vulnerabilities exploited by Stuxnet (MS08-067, MS and MS10-061).

Analysis of the available Detection and Removal tools has been expanded. Vulnerable systems are revised to include unsupported and current versions of Windows including Windows 2000, Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008 and Windows 7. Information on the spread of the malware has been updated. The following are the key changes in this version of the White Paper: Sections on what Stuxnet is, what it does and what the consequences are of being infected have been completely rewritten in light of new information released by Ralph Langner, Symantec and others. It has been changed to Analysis of the Siemens WinCC / PCS7 Stuxnet Malware for Industrial Control System Professionals. What s New in this Version This document was previously titled Analysis of Siemens WinCC / PCS7 Malware Attacks. It also summarizes the actions that operators of SCADA and ICS systems can take to protect critical operations. This White Paper summarizes the current known facts about the Stuxnet worm. It takes advantage of at least four zeroday vulnerabilities i, has seven different propagation processes and shows considerable sophistication in its exploitation of Siemens systems. It is also one of the most complex and carefully engineered worms ever seen. The objective of the malware appears to be to reprogram and sabotage these industrial processes. Of concern to the SCADA and industrial control systems (ICS) community is the fact that Stuxnet was designed to target one or more industrial systems that use Siemens PLCs. Executive Summary Stuxnet is a computer worm designed to take advantage of a number of previously unknown vulnerabilities present in the Windows operating system and Siemens SIMATIC WinCC, PCS7 and S7 product lines. Scott Howard Technical Services Manager, Byres Security Inc. 1 Tofino Security White Paper Version 3.1 Published OctoAnalysis of the Siemens WinCC / PCS7 Stuxnet Malware for Industrial Control System Professionals Contents Executive Summary.