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Name Szchost.exe


Trojan.Mercurycas.A is a Trojan horse that allows an infected computer to be used as an email relay.

When it is executed, it performs the following actions:
Drops the following files:
%System%\Szchostc.exe (A legitimate proxy utility named 3[APA3A]tiny proxy)

Adds the value: "Olive System"="%System%\Szchost.exe"
to the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Adds the value: "winid"=[date and time of infection]
to the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Mrdodf

Adds the value: "Datu"=[IP address]
to the registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Mctest

Executes %System%\Szchostc.exe, which runs a proxy on a port number calculated from the current system time.
Connects to the IP address on TCP port 25 to receive instructions from the attacker.
Attempts to download the file, %System%\, from a remote host that is hard-coded in the Trojan.
Gathers various pieces of system information based on the content of
This may include IP address, Computer Name, folder listings, and so on.
Submits information gathered to a PHP page at, along with the port number on which the proxy runs.

Manual removal:
Please remove all keys that described above.

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