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When the infected documents are shared with other users and systems, the virus spreads. Macro viruses have been used as a method of installing software on a system without the user's consent, as they can be used to download and install software from the internet through the use of automated key-presses.
As an example, VBA code written in Microsoft Access can establish references to the Excel, Word and Outlook libraries; this allows creating an application that – for instance – runs a query in Access, exports the results to Excel and analyzes them, and then formats the output as tables in a Word document or sends them as an Outlook email.
A Document, or an ASCII text file with text formatting codes in with the text; used by many word processors Microsoft Word and others DOCM: Microsoft Word Macro-Enabled Document Microsoft Word: DOCX [78] Microsoft Word Document Microsoft Word: DOT [78] Microsoft Word document template Microsoft Word: DOTX [78] Office Open XML Text document ...
GIFV – Graphics Interchange Format Video, a format used for short, looping videos that combines the advantages of GIFs and videos, with better playback quality and lower file sizes [14] GRF – Zebra Technologies proprietary format; ICNS – format for icons in macOS. Contains bitmap images at multiple resolutions and bitdepths with alpha ...
Because Excel is widely used, it has been attacked by hackers. While Excel is not directly exposed to the Internet, if an attacker can get a victim to open a file in Excel, and there is an appropriate security bug in Excel, then the attacker can gain control of the victim's computer. [125] UK's GCHQ has a tool named TORNADO ALLEY with this purpose.
PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...
Download data is sent downstream to an end-user, upstream from the provider. ISP = internet service provider. Downloading generally transfers entire files for local storage and later use, as contrasted with streaming, where the data is used nearly immediately while the transmission is still in progress and may not be stored long-term.
The primary application of the Levenberg–Marquardt algorithm is in the least-squares curve fitting problem: given a set of empirical pairs (,) of independent and dependent variables, find the parameters of the model curve (,) so that the sum of the squares of the deviations () is minimized: