Re: unpacking UPX or PE-packed binaries

Blue Boar wrote:
> Karma wrote:
>
>> Just interested in how AV R&D companies unpack worms with complex UPX
>> and PE
>> pack protocols.
>
>
> The modified UPX packing is a pretty small change usually. Compare one
> with a standard UPX header for the same version. There are a variety of
> unpackers out there.

[Hey BB, 'sup? :)]

Having taken a look at the samples, they are indeed agobots (look a bit
more like phatbots, but who can tell anymore?), but polymorphic ones
(polybots).

Also, they are packed using PE-Crypt.Wonk, which would explain why upx
-d didn't work.

        Gadi Evron.
Received on Apr 26 2004