I just tried, You can add as many thing you want after the filesize even using filesplit but then you would have to filter the eof data first
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.NET
[SCR] New way of EOF Data (No Dropper Detection) ! |
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May 19, 2010 11:47 AM
(This post was last modified: May 19, 2010 11:48 AM by SteloNLD.)
(May 19, 2010 11:37 AM)Miharbi-DoNo Wrote: yes it should be detected all of it as EOF Data. or i think so. lol i though he explained me that file + file will be detected like 1 file for av's and file + normal-tekst + file been detekted as 2 files this have's some logic you can't see diferents between tekst and tekst and diferent between file and file explain 0101010 + 01011100 is 010101001011100 if you dont know how each file looks then you even dont know wich is wich part but when you have 0101010 + hello + 01011100 result 0101010hello01011100 then you see it :P (May 19, 2010 11:47 AM)SteloNLD Wrote: lol i though he explained me that file + file will be detected like 1 file for av's and file + normal-tekst + file been detekted as 2 files now even each char from hello is an 8-bit (byte). but what i mean is, avira will read all file, then there is defined structures of a valid win32 app (you can check any runpe and you will find them). then it will take that file and start filling those structures from data of the file. if the data matches the structure, no eof. if we filled all structures and there is some data left, eof not empty.
:P i think i under stand but then then AV"S are seeing the diferents between Stub + file
but what i under stand from the code is that the EOF function he used isn't seeing the file as EOF data so this function is making simple coding harder and i now even dont understand why it is not detected as dropper any more maybe someone could explain :P other wise i dont use it :P
This looks nice, but I need a way to bypass avira without modifying the crypter - just the stub. It seems impossible at this point. I'm going to write some emails up claiming some files as false positive's and make them 100% legitimate files just to bypass avira on my crypters.
(May 19, 2010 01:26 PM)South Park Wrote: This looks nice, but I need a way to bypass avira without modifying the crypter - just the stub. It seems impossible at this point. I'm going to write some emails up claiming some files as false positive's and make them 100% legitimate files just to bypass avira on my crypters. They are going to ask for file samples or their source. |
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