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> What does Tdsskiller mean by this?, Forged file, fake MD5
post 7.07.2011 20:24
Post #1


Group: Members
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Joined: 7.07.2011

When Tdsskiller produces an output like this:

Suspicious file (Forged): C:\windows\system32\drivers\filename5.sys. Real md5: f0269e9f841c4e39ebbb366531b8290f, Fake md5: 63c0be20a6db9824951e5c2d4116503c
filename - detected ForgedFile.Multi.Generic (1)

What does it mean exactly? Does it mean that the MD5 hash is cryptographically forged? If so how can tdsskiller detect this? Or does it just mean the hash doesn't match the file?

What is tdsskiller actually doing with regards to MD5 hashes and what is it doing in general to detect infected drivers?

Some people are implying that virus writers can now forge MD5 hashes to make fake but passable signing certificates. Is that actually the case?


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post 8.07.2011 07:00
Post #2

Virus Analyst

Group: KL Russia
Posts: 744
Joined: 21.10.2008


"ForgedFile.Multi.Generic" detect means that file contents readen through WinAPI differs from the contents readen through low-level disk access (Real md5 - hash calculated through low-level access, Fake md - WinAPI).

But in this case it's probably false alarm (both are Hitman Pro 3.5 drivers).
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