August 2009

A number of anti-virus vendors are reporting new malware that takes a slightly different approach than the norm.
BitDefender and Kaspersky refer to the virus as Win32.Induc.A.
What is different about this virus is that it compromises systems running the Delphi compiler. Once the compiler itself is compromised all resulting code generated by the compiler is also infected. The virus is relatively simple in that it only wants to propogate, no other payload has been utilized.
A funny side effect is that in the few days since this virus has been detected in the wild, a number of trojans have been discovered to be affected with the virus. Obviously they were compiled with an infected Delphi compiler.
According to the people over at BitDefender the easiest way to detect if your Delphi instance is infected is to check if their compilers’ Lib folder contains a SysConst.bak file (the most obvious sign of infection) and to rename it to SysConst.dcu if it exists, overwriting the compromised file, then recompile their applications.
Special thanks to reader Artyom for pointing us to this story.
Update:
A commenter dusted some cobwebs out of my brain by pointing to a paper I read as a lowly undergrad some 25 years ago. Ken Thompson of Bell Labs fame presented a paper to the Turing Award Lecture entitled Reflections on Trusting Trust. In this paper Mr. Thompson mentions the concept of compromising the Unix login binary by first infecting the compiler.
– Rick Wanner – rwanner at isc dot sans dot org

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