![]() Ok, I think it is better to have a walktrough on decoding a malware sample. The second method uses customized encoding functions, where attackers usually use an encoding process to create the obfuscated code and attach a decoding function to decode it during execution.ĭecoding the exact value with specific algorithm where in this case the value will be Xored with 94 The first way is to convert the code into escaped ASCII characters, Unicode, or hexadecimal representations. Typically, there are three ways to encode original code. String splitting is to convert a string into the concatenation of several substrings. ![]() Two data obfuscation techniques have been wildly applied to a string object. In the end, the code has a different static pattern where the impact the protection that based on hash protection will fail to detectĭata obfuscation is to convert a variable or a constant into the computational results of one or several variables or constants. Besides the variable name, some spaces and random comments are injected into the code to make it is harder for human eyes on the static analysis process but this change without changing the semantic of the code itself. ![]() We can see from the above code that the code variables have been randomized. The malware creator may randomly change the javascript code elements without changing the semantics of the codes. I want to share another method of javascript obfuscation by implementing randomization. Return m圜lass() //invoking anonymous funtionFollow up my previous post about the javascript evasion technique that the malware creator uses code obfuscation to bypass the malware protection in the delivery phase.
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