Re: Troyan horse in vimrun.exe ?

2013-08-13 Fir de Conversatie Joost Andrae

Hi Tony,

thank you very much for your reply.


 Do you still get the same error if you _don't_ pack the executables with
 upx? Packing executables is something which can be done with any
 program, good or bad, and if your antivirus software has imprecise
 signatures generated from the packing software part of a packed trojan
 executable, false alarms may result on legit software packed by the same
 means.


I expect it to be a false positive. I'll try to re-build it without 
using upx. Otherwise I could re-build it using GCC and afterwards strip 
the binaries within my Cygwin environment.


Kind regards, Joost

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Re: Troyan horse in vimrun.exe ?

2013-08-13 Fir de Conversatie Joost Andrae

Hi,

I've re-built Vim 7.4 (32 bit) without using upx and suddenly the 
antivirus software doesn't quarantine the vimrun.exe file. Unfortunately 
Cygwin's strip command doesn't strip much of the file size...



 
  Do you still get the same error if you _don't_ pack the executables with
  upx? Packing executables is something which can be done with any
  program, good or bad, and if your antivirus software has imprecise
  signatures generated from the packing software part of a packed trojan
  executable, false alarms may result on legit software packed by the same
  means.
 


Thanks for your comment!

Kind regards, Joost

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Re: Troyan horse in vimrun.exe ?

2013-08-13 Fir de Conversatie Tony Mechelynck

On 13/08/13 13:30, Joost Andrae wrote:

Hi,

I've re-built Vim 7.4 (32 bit) without using upx and suddenly the
antivirus software doesn't quarantine the vimrun.exe file.


Good! It was a false alarm then.


Unfortunately
Cygwin's strip command doesn't strip much of the file size...


Well, what strip removes is usually just symbol tables and such, 
otherwise AFAIK it doesn't compress the executable. I hope you kept 
the unstripped binary too, it can be useful for debugging (if you crash 
with the unstripped executable, the debugger can get symbols from it).



Best regards,
Tony.
--
Nobody is one block of harmony.  We are all afraid of something, or feel
limited in something.  We all need somebody to talk to.  It would be good
if we talked to each other--not just pitter-patter, but real talk.  We
shouldn't be so afraid, because most people really like this contact;
that you show you are vulnerable makes them free to be vulnerable too.
It's so much easier to be together when we drop our masks.
-- Liv Ullman

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Re: Troyan horse in vimrun.exe ?

2013-08-12 Fir de Conversatie Tony Mechelynck

On 12/08/13 14:04, Joost Andrae wrote:

Hi,

I just hg cloned the 7.4 source tree and built i with MSVC 2010 Express
on my Win 7 Pro 64 bit system. After sucessfully building and copying
the files into a local directory like described in INSTALLpc.txt, then
packing the binaries with upx (from sf.net) and starting the vim.exe
(GUI+OLE built-in) suddenly my Norton Internet Security quarantined the
file vimrun.exe because it thought it contains Suspicious.Mystic

http://www.symantec.com/security_response/writeup.jsp?docid=2010-062900-4618-99vid=42288product=Norton%20Internet%20Securityversion=20.4.0.40plang=sym:GElayouttype=Retailbuildname=RetailheartbeatID=70E43493-C73E-4541-AE4D-794AC87FEADDenv=prodvendorid=1002400plid=2plgid=2skup=21261306skum=21234392skuf=21228658endpointid={70E43493-C73E-4541-AE4D-794AC87FEADD}partnerid=1002400lic_type=2lic_attr=21124114psn=987DM6RRK9QWosvers=6.1oslocale=iso:DEUoslang=iso:GERos=windows


I'm not suscribed to this list. I've posted via Gmane to let you know...

Kind regards, Joost



Do you still get the same error if you _don't_ pack the executables with 
upx? Packing executables is something which can be done with any 
program, good or bad, and if your antivirus software has imprecise 
signatures generated from the packing software part of a packed trojan 
executable, false alarms may result on legit software packed by the same 
means.



Best regards,
Tony.
--
Coward, n.:
One who in a perilous emergency thinks with his legs.
-- Ambrose Bierce, The Devil's Dictionary

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