Pay-Per-Install Analysis – Part Three

InstallConverter

This is where things get interesting. This company distributes one executable, TDL3. TDL3 is a very advanced piece of stealth malware, with rootkit capabilities. Here you can see Symantec are well aware of this.

Backdoor.Tidserv

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This is how much they per for 1000 installs per country.

USA -	$170
Canada - $120
United Kingdom - $110
Australia, Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Netherlands, Norway, Spain, Sweden, Switzerland - $50

This is a list of strings from the unpacked executable. Notice the similarities to the Symantec writeup.

0x00013158 0x00000016 %1d.%1d %04d SP%1d.%1d
0x00013170 0x00000040 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
0x000131BC 0x00000014 %s|%s|%s|%x|%x|%s|%s
0x000131DC 0x00000012 %[^;];%[^;];%[^;];
0x000131F8 0x0000000A \tdrv
0x00013204 0x0000000A \tdev
0x00013220 0x00000012 %[^;];%[^;];%[^;];
0x0001323C 0x00000024 system\currentcontrolset\services\%s
0x00013264 0x00000009 imagepath
0x00013278 0x00000028 \registry\machine\%S
0x000132A4 0x0000001C \\?\globalroot%wZ\tdlcmd.dll
0x000132C4 0x00000014 \\?\globalroot%wZ\%s
0x000132DC 0x00000009 bckfg.tmp
0x000132E8 0x00000014 \\?\globalroot%wZ\%s
0x00013304 0x0000000E %[^|]|%[^|]|%s
0x00013314 0x00000007 servers
0x0001331C 0x00000006 tdlcmd
0x00013324 0x0000000A wspservers
0x00013330 0x00000006 tdlcmd
0x00013338 0x0000000C popupservers
0x00013348 0x00000006 tdlcmd
0x00013350 0x00000011 %d.%d.%d %d:%d:%d
0x00013364 0x00000009 builddate
0x00013370 0x00000018 services.exe
0x0001338C 0x0000000E IsWow64Process
0x0001339C 0x00000008 kernel32
0x000133A8 0x00000020 \\?\globalroot%s
0x000133DC 0x00000007 spooler

TDL3 infects a random driver, so after infection I ran TDSSKiller.

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There you can see its infected one of my VirtualBox drivers. TDSSKiller was able to remove it after a reboot.

To be continued…

The Case Of TDL3
Tidy TDSS (TLD3) Paper

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