Some programs can give a suggestion to repair the file automatically (after the error), and some programs cannot repair it. If a virus or trojan with this payload method manages to alter files critical to the running of the computer's operating system software or physical hardware, the entire system may be rendered unusable. Some types of malware may intentionally corrupt files as part of their payloads, usually by overwriting them with inoperative or garbage code, while a non-malicious virus may also unintentionally corrupt files when it accesses them.
The adjacent image is a corrupted image file in which most of the information has been lost. For example, if a document file is corrupted, when a person tries to open that file with a document editor they may get an error message, thus the file might not be opened or might open with some of the data corrupted (or in some cases, completely corrupted, leaving the document unintelligible). Results could range from a minor loss of data to a system crash. In general, when data corruption occurs, a file containing that data will produce unexpected results when accessed by the system or the related application.
Damage on PNG image as a result of one altered bit
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