Win32/Yoddos [Threat Name] go to Threat

Win32/Yoddos.CA [Threat Variant Name]

Category trojan
Size 81920 B
Aliases Trojan-Dropper.Win32.Dinwod.wyn (Kaspersky)
  Trojan:Win32/Dynamer!ac (Microsoft)
Short description

The trojan serves as a backdoor. It can be controlled remotely.


When executed, the trojan copies itself into the following location:

  • %windir%\­sys%variable%.exe

A string with variable content is used instead of %variable% .

The trojan registers itself as a system service using the following name:

  • KillAllmkea web Service

The following Registry entries are created:

  • [HKEY_LOCAL_MACHINE\­SYSTEM\­CurrentControlSet\­Services\­KillAllmkea web Service]
    • "Description" = "WebSystemhcva Kill All Service."
    • "DisplayName" = "WebSystemfpla"
    • "ImagePath" = "%windir%\­sys%variable%.exe"

This way the trojan ensures that the file is executed on every system start.

Information stealing

The trojan collects the following information:

  • operating system version
  • language settings

The trojan attempts to send gathered information to a remote machine.

Other information

The trojan acquires data and commands from a remote computer or the Internet.

The trojan contains a URL address. The HTTP protocol is used in the communication.

It may perform the following actions:

  • download files from a remote computer and/or the Internet
  • run executable files
  • perform DoS/DDoS attacks

The trojan may create the following files:

  • %temp%\­win%variable1%a%variable2%b%variable3%d.exe

A string with variable content is used instead of %variable1-3% .

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