Win32/TrojanDownloader.Nymaim [Threat Name] go to Threat

Win32/TrojanDownloader.Nymaim.BA [Threat Variant Name]

Category trojan
Size 626688 B
Aliases Trojan.Win32.Regsup.kyz (Kaspersky)
  Trojan.Inject2.20729 (Dr.Web)
  TrojanDownloader:Win32/Silcon!rfn (Microsoft)
Short description

Win32/TrojanDownloader.Nymaim.BA is a trojan which tries to download other malware from the Internet.


The trojan does not create any copies of itself.

The trojan creates the following file:

  • %temp%\­%variable1%

The trojan executes the following files:

  • %windir%\­system32\­rundll32.exe -%variable2% %variable3%.dll

The trojan creates and runs a new thread with its own code within these running processes.

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

The trojan may create and run a new thread with its own program code within any running process.

Information stealing

The trojan collects the following information:

  • user name
  • computer name
  • operating system version
  • list of running processes
  • language settings
  • volume serial number
  • screenshots
  • digital certificates

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 checks for Internet connectivity by trying to connect to the following servers:


The trojan generates various URL addresses.

It tries to download a file from the addresses.

The file is then executed.

The trojan quits immediately if it is run within a debugger.

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