![]() The return code for this condition is DEADF007 (see code snipplet). ![]() Depending on the return code of FC 1874, original code is either called or skipped. The Step7 code that Stuxnet injects calls FC 1874. OB 35 is the 100 ms timer in the S7 operating environment. If the condition matches, Stuxnet injects Step7 code into OB 35 that is executed on the PLC every time that OB 35 is called. Based on a conditional check, original code for OB 35 is manipulated during the transmission. Check for the presence of DB 8062 in your project.įact: Stuxnet intercepts code from Simatic Manager that is loaded to the PLC. ![]() We assume that this process variable belongs to a slow running process because it is checked by Stuxnet only every five seconds.įact: Another fingerprint is DB 8062. We assume that the second DWORD of 890 points to a process variable. Interpretation: We assume that DB 890 is part of the original attacked application. ![]() Based on the conditional check in code that you can see above, information in DB 890 is manipulated by Stuxnet. This occurs periodically every five seconds out of the WinCC environment. ![]() Here is what everybody needs to know right now.įact: As we have published earlier, Stuxnet is fingerprinting its target by checking data block 890. With the forensics we now have it is evident and provable that Stuxnet is a directed sabotage attack involving heavy insider knowledge. Stuxnet logbook, Sep 16 2010, 1200 hours MESZ ![]()
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