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Created: Tuesday, November 8 2005 13:17.46 CST Modified: Tuesday, November 8 2005 13:17.46 CST
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Julius 0.2a vs MS05-053 (gdi32.dll)
Author: rfreeman # Views: 2641

Despite significant changes, Julius' version number has incremented only slightly since my last entry almost a month ago. It is now much more capable with respect to non-patches, though significant changes to program structure due to optimization differences is an ongoing battle.

I need to leave for the airport in a bit and will not have a chance to start a more rigorous analysis of MS05-053 until tomorrow night, but I wanted to post some interesting results for interested parties.

There are several changed subfunctions; however, I have selected the most salacious results for publication here in my blog. It is possible that I have excluded something that I shouldn't have, or didn't correctly match with Julius.


p: [ 77f11788 ] == u: [ 77f2c860 ][ PlayMetaFileRecord ] ,d = 0.0769, t = 4
[L10] -- Patched function copies memory and features more comparisons, and altered suspicious looping, and changed data constants.
[L7-] -- Original function loops but the patched version features more comparisons and changed data constants.

p: [ 77f3a7a0 ] == u: [ 77f3a300 ][ RecordObject ] ,d = 0.0028, t = 4
[L10] -- Patched function copies memory and features changed data constants.
[L7-] -- Original function loops but the patched version features changed data constants.
[L6+] -- Patched function is very similar and features more boolean logic.

p: [ 77f3baa5 ] == u: [ 77f3b605 ][ SetWinMetaFileBits ] ,d = 0.4371, t = 4
[L10] -- Patched function copies memory and features changed data constants, and altered suspicious looping.
[L8 ] -- Functions are quite similar, but there are less signed comparisons.
[L7-] -- Original function loops but the patched version features changed data constants.

p: [ 77f49492 ] == u: [ 77f49062 ][ GetEnhMetaFilePaletteEntries ] ,d = 0.0306, t = 4
[L10] -- Patched function copies memory and features more comparisons, and changed data constants.

p: [ 77f4b253 ] == u: [ 77f4ada4 ][ MF_AnyDIBits ] ,d = 0.0355, t = 4
[L10] -- Patched function copies memory and features more comparisons, and changed data constants.
[L6+] -- Patched function is very similar and features more boolean logic.




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