Win32/Citirevo [Threat Name] go to Threat

Win32/Citirevo.AE [Threat Variant Name]

Category trojan
Size 154624 B
Detection created Oct 23, 2012
Detection database version 7616
Aliases TR/Dropper.Gen (Avira)
Short description

Win32/Citirevo.AE is a trojan which tries to download other malware from the Internet.

Installation

When executed, the trojan creates one of the following files:

  • %profile%\­Iterra\­%variable%.dll (39936 B, Win32/Citirevo.AC)
  • %profile%\­Iterra\­0105.tmp (39936 B, Win32/Citirevo.AC)
  • %system%\­%variable%.dll (39936 B, Win32/Citirevo.AC)
  • %profile%\­AddIterra\­%variable%.dll (39936 B, Win32/Citirevo.AC)

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


The trojan creates the following files:

  • %profile%\­Iterra\­T03emp03.reg
  • %profile%\­Iterra\­T04emp04.reg

The files are then executed.


The following Registry entry is set:

  • [HKEY_LOCAL_MACHINE\­SOFTWARE\­Microsoft\­Windows NT\­CurrentVersion\­Windows]
    • "AppInit_DLLs" = "%malwarefilepath%"
    • "LoadAppInit_DLLs" = 1

This way the trojan ensures that the libraries with the following names will be injected into all running processes:

  • %malwarefilepath%

The trojan creates and runs a new thread with its own program code within the following processes:

  • explorer.exe
Information stealing

The trojan collects the following information:

  • disk serial number (without spaces)
  • network adapter information

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

Other information

Win32/Citirevo.AE is a trojan which tries to download other malware from the Internet.


The trojan contains a list of (23) URLs.


It tries to download several files from the addresses.


The files are saved into the following folder:

  • %cookies%\­cf

The files are then executed. The HTTP protocol is used.


The trojan may delete files stored in the following folders:

  • %cookies%\­
  • %internetcache%\­

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


It can execute the following operations:

  • monitor network traffic
  • modify network traffic

The trojan alters the behavior of the following processes:

  • iexplore.exe
  • opera.exe
  • firefox.exe
  • chrome.exe

The trojan hooks the following Windows APIs:

  • closesocket (ws2_32.dll)
  • connect (ws2_32.dll)
  • ioctlsocket (ws2_32.dll)
  • recv (ws2_32.dll)
  • select (ws2_32.dll)
  • send (ws2_32.dll)
  • WSAAsyncSelect (ws2_32.dll)
  • WSAConnect (ws2_32.dll)
  • WSAEnumNetworkEvents (ws2_32.dll)
  • WSAEventSelect (ws2_32.dll)
  • WSAGetOverlappedResult (ws2_32.dll)
  • WSASend (ws2_32.dll)
  • WSASocket (ws2_32.dll)

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