polymorphic code

Some viruses use something called polymorphic code to change their signature every time they move.

This gave the generated polymorphic code a more realistic appearance.

See polymorphic code for technical detail on how such engines operate.

Templates in C++ provide a sophisticated mechanism for writing generic, polymorphic code.

Polymorphic code was the first technique that posed a serious threat to virus scanners.

Some new viruses, particularly ransomware, use polymorphic code to avoid detection by virus scanners.

It wasn't until a year or more later that Dark Avenger's viruses began to employ polymorphic code.

Some viruses employ polymorphic code in a way that constrains the mutation rate of the virus significantly.

Viruses and shellcodes that use self-modifying code mostly do this in combination with polymorphic code.

This differ from polymorphic code, where the polymorphic engine can not rewrite its own code.

Polymorphic code (Computer virus terminology)

This example is not a really polymorphic code but will serve as an introduction to the world of encryption via the XOR operator.

Polymorphic code - computer code that constantly mutates while keeping the original algorithm, making the malicious code difficult to locate and neutralize.

In computer terminology, polymorphic code is code that uses a polymorphic engine to mutate while keeping the original algorithm intact.

Polymorphic code is another means to circumvent signature-based IDSs by creating unique attack patterns, so that the attack does not have a single detectable signature.

To enable polymorphic code, the virus has to have a polymorphic engine (also called mutating engine or mutation engine) somewhere in its encrypted body.

However, techniques exist to bypass these filters and manipulations; alphanumeric code, polymorphic code, self-modifying code and return-to-libc attacks.

On November 19, 2012 the debut album "Polymorphic code" was released via Basick Records, which included seven previously unreleased songs as well as the song "Tr0jans".

After the file becomes resident in the system memory below the 640k DOS boundary, the operator will experience total system slow down as a result of the virus' polymorphic code.

Bulgarian virus writer Dark Avenger wrote 1260, the first known use of polymorphic code, used to circumvent the type of pattern recognition used by Anti-virus software, and nowadays also intrusion detection systems.

The advantage of using such slow polymorphic code is that it makes it more difficult for antivirus professionals to obtain representative samples of the virus, because bait files that are infected in one run will typically contain identical or similar samples of the virus.