Ivana is a Word macro virus. It consists of several encrypted macros: Ivana, EditUndo, AutoClose, Underline, ToolsMacro and FileTemplates.
The macros 'Ivana' is used by the virus for previous infection check and has the following text strings:
' Dedicated to Ivana, the only one ' [by [utik]
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
A Word document is infected by the virus on closing. First, the virus disables the dialog asking to confirm saving of modified NORMAL.DOT template. Then the 'AutoClose' macros performs 'Ivana' macros search and infects NORMAL.DOT if it was not previously infected. After that the virus infects the current document (if it was not previously infected) and saves it to disk.
The Ivana virus has a sequence of payloads. On Sundays the virus removes formatting bar from the screen. On Mondays it disables vertical scroll bar setting in Tools\Options\View setup which result in vertical scroll bar disappearing from the document window.
On 13th day of every month the virus inserts 10 empty lines and the following text to the end of the infected document:
'Na kraju, samo jos da kazem: volim te, Ivana [by utik] 'And finally, I would like to say: I love you, Ivana [by utik]
On 4th of July the virus performs the nastiest trick. It adds the word 'Ivana' to the end of the document, sets the document password to 'Ivana' and saves the document to disk. The document becomes inaccessible for the user who doesn't know the password.
The Ivana virus disables undo operations during 15 seconds of each minute. The virus also disables 'Tools\Macro' submenu and document format selection in 'Save As' dialog, so that the infected file could be saved only in *.DOT format. And finally the virus changes the function of 'Underline' macros - instead of changing font properties to 'underlined' the modified macros changes them to 'bold'.
Technical Details: Alexey Podrezov, F-Secure