AUTO TEXT EXPANDER MALWARE CODE

Adversaries know that itР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›s a highly reliable technique that everyday users can do little about. ConclusionР В РІР‚СњР В РІР‚РЋor as long as malware thrives, so too will obfuscation. Malware creators may also develop custom packers that defeat unpacking scripts and forces reverse engineers to unpack the program to see what it is doing. The process of decompression ensures the executive file doesnР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›t look anything like its original self.Р В РІР‚СњР вЂ™Р’В®ven though there are legitimate benefits of using packers, such as reducing the size of the executables or making it difficult for pirates to engage in reverse engineering, malware often leverages packed executables to attempt to hide from security defenses.

AUTO TEXT EXPANDER MALWARE CODE

It then packages the compressed executable inside the code required to decompress itself at runtime. This is done with the help of software, which compresses an executable to reduce its size. In many instances, the whole program is obfuscated to keep everyone from detecting the malware code until it is inserted in memory. It can also be configured to rotate a distinctive number of characters, such as ROT15. It leverages simple letter substitution for delivering an obfuscated output, where ROT acts as an ASM instruction that says Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўrotate.Р В Р вЂ Р В РІР‚С™Р РЋРЎС™ Hence, ROT13 is another name for Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўrotate 13.Р В Р вЂ Р В РІР‚С™Р РЋРЎС™Р В РІР‚СњР В РІР‚С›dversaries, therefore, would need to rotate a letter by thirteen to encode it, which means they would need to count the next 13 letters of the alphabet until they reach Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўn.Р В Р вЂ Р В РІР‚С™Р РЋРЎС™ ROT13 capitalizes on a simple letter substitution for jumbling the text. ROT13Р В РІР‚СњР В РІР‚С›nother popular malware obfuscation technique is ROT13.

For combating the insertion, signature-based antivirus solutions need to wipe off the instructions before conducting analysis. However, it doesnР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›t alert the programР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›s behavior. Dead code insertionР В РІР‚СњР вЂ™Р’Вead code insertion is a rudimentary tactic that inserts some ineffective code into a program to modify its appearance. The technique is trivial to decode if it can be recognized. The encoding functions by taking 3 characters and stringing them with each other to create a 24-bit string thatР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›s later broken into 4 chunks of 6-bits, which are then translated into one of the characters from Base64. Characters a-z, A-Z, + and /, and 0-9 are also present in the alphabet. ItР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›s basically an encoding technique that involves 64 characters, with the padding character being the = (equal) sign. Base64Р В РІР‚СњР В РІР‚С›nother well-known obfuscation technique utilized by adversaries is Base64. To apply the technique, the malware first decompiles the program into manageable elements, adding itself between them, and then reassembles the injected code into a new variant. Code integrationР В РІР‚СњР В РІР‚РЋirst seen in the Zmist/Win95 malware (known as Zmist), code integration instructs a malicious code to knit itself to the code of the target program. Which will be the same as MOV EBX, 0A609832Ah.Р В РІР‚СњР вЂ™Р’В®ach of these techniques makes the malware difficult to read unless a trained reverse engineer applies 0x55 XOR values to the code. For example, XORing with all 1s is not equal to NOT: Other techniques include adding a value, then modifying it with XOR. For example, they can compare EAX ESP, run a number of instructions and then finally test EBX, EAX. For example, INC EBX can be overwritten as MOV EBX, 59F67CD5h.Р В РІР‚СњР В РІР‚С›dversaries can also run comparisons, then ignore the flags that are set. It does this by swapping the contents of two variables inside the code, such as:Р В РІР‚СњР В РІР‚С›nother method is to assign junk values, which will compose values that are simply overwritten later on. This popular method of obfuscation conceals data so it cannot be analyzed. Below is a breakdown of the techniques they commonly use to steer clear of security defenses. Malware creators routinely utilize obfuscation to complicate the detection of their code. What are some popular malware obfuscation techniques?

Sometimes they go a step further and use special tools called Р В Р вЂ Р В РІР‚С™Р РЋРЎв„ўpackersР В Р вЂ Р В РІР‚С™Р РЋРЎС™ to obfuscate the entire program, which makes reverse engineering and analysis much more difficult. Examples of these strings would be registry keys and infected URLs.Р В РІР‚СњР В РІР‚С›dversaries commonly use encryption/encoding techniques to conceal the data from security programs.

It helps adversaries hide critical words (known as strings) a program uses because they reveal patterns of the malwareР В Р вЂ Р В РІР‚С™Р Р†РІР‚С›РЎС›s behavior. Malware obfuscation is a process that makes textual and binary data difficult to understand. One of the most commonly used methods is obfuscation.

Auto text expander malware