Backdoor code was found added in a popular Ruby library used for frontend user interfaces inside Ruby and Ruby on Rails applications. The malicious code was removed via a library update.

Polymorphic bootstrap code Since Rovnix.B the modified bootstrap code has used polymorphic code in order to bypass static antivirus signature detection.

B. Efron, R. Tibshirani, Bootstrap Methods for Standard Errors, Confidence Intervals, and Other Measures of Statistical Accuracy, Statistical Science, Vol. 1, No. 1 ...