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Pete Finnigan
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Oracle Rootkit: Modify the binary file
« on: May 18th, 2007, 8:29am »
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2 all,
 
I read the Oracle Rootkit whitepaper of Alex:  
 
Alex show the way to make a rootkit: replace all sys.user$ to sys.aser$ in a binary file.
 
If you already know that, please help me anwser two questions:
1. Which binary file Alex mention about ? and
2. How can we modify the binary without breaking the Data Integrity of Oracle ?
 
I replaced all the sys.user to sys.aser in the datafile of SYSTEM tablespace, but after that, I cant OPEN my Database.
 
Thanks.
 
 
 
 
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Pete Finnigan
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Re: Oracle Rootkit: Modify the binary file
« Reply #1 on: May 18th, 2007, 1:58pm »
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Hi
 
You must modify the binary file oracle.exe (don't forget to save a copy) with a hex editor (e.g. ultraedit). The file oracle.exe contains the select statements retrieving data from the sys.user$. If you replace sys.user$ with sys.aser$ Oracle is retrieving data from there.
 
If you modify the datafile of the system-tablespace the block checksums are corrupted and Oracle will not start
 
I hope this is sufficient.
 
Regards
 
 Alex
 
--
 Red-Database-Security GmbH
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Pete Finnigan
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Re: Oracle Rootkit: Modify the binary file
« Reply #2 on: May 20th, 2007, 9:46pm »
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Hi,
 
As Alex says you must modify the binaries not the data files. Although that said I can (using thought experiments) see ways to create rootkits by modifying data blocks. To modify a datablock as Alexsays you must at least correct the checksums to make the block pass load checks.  
 
Also of interest is a paper on my internals page - http://www.petefinnigan.com/other.htm that shows how to modify the database bootstrap$ - http://www.vijaymukhi.com/oracled.doc - (Its an MS Word doc - its not mine - beware opening word docs. I have opened it and it was fine but you should save/virus check then open locally if you are worried) - This is also an interesting post and gives me interesting ideas in the areas of rootkits.
 
cheers
 
Pete
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Re: Oracle Rootkit: Modify the binary file
« Reply #3 on: May 21st, 2007, 7:17am »
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Hi Alex,
 
I follow the steps in your whitepaper, but It seems that I'm not lucky:
1. Create a user hacker with DBA privileges
2. Create a copy of the table sys.user$  
3. Drop user hacker from sys.user$
4. Shutdown database
5. Patch binary file
6. Start database
 
I replaced all the sys.user$ to sys.aser$ in the oracle.exe file, but I cant login successfully with dropped user.
 
I tested on the following version: 9.2.0.1, 10.2.0.1 and 10.2.0.3.
 
Should I need to make any additional step ?
 
Thank Alex.
 
Thank Pete for the good paper.
 
Regards.
 
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