![]() ![]() Looking inside the NSIS script we can see the performed actions that are very simple: Both of them are encrypted, and to find out what they contain we need to analyze the full chain of loading. One of them is around 7 KB, and the next: much bigger. In the same directory there are two other files. It starts from bytes:Īnalogous shellcode can be found in the second sample from this campaign. The first one, 1 KB in size, is a shellcode. What is more interesting are the files in the main directory. It is the first component of the archive to be loaded. The System.dll is a DLL typical for any NSIS installer, responsible for executing the commands from the script. Once we unpack the file, we can see several elements, as well as directories typical for NSIS: Unfortunately, in the newer releases script extraction is no longer supported. 15.05) were also able to extract the NSIS script. Like every NSIS-based installer, this executable is an archive that can be unpacked with the help of 7zip. This analysis is based on the following samples: With time their internal structure has evolved, so we decided to revisit them and describe the inside again using samples from some of the Formbook stealer campaigns. We wrote about unpacking them in the past, i.e. The flexibility of the installer allows to implement various ideas for obfuscating malicious elements. The outer layer made of a popular and legitimate tool makes for a perfect cover. Unfortunately, its qualities are known not only to legitimate developers but also to malware distributors.įor several years we have been observing malware distributed via NSIS-based crypters. It is a free and powerful tool, making distribution of software easier. the main executable, used DLLs, configs), along with a script that controls where are they going to be extracted, and what their execution order is. It allows to bundle various elements of an application together (i.e. ![]() NSIS (Nullsoft Scriptable Install System) is a framework dedicated to creating software installers. ![]() Prior to attending thiscourse, you will be asked to sign an agreement stating that you will not use the newly acquired skills for illegal or malicious attacks and you will not use such tools in an attempt to compromise any computer system, and to indemnify EC-Council with respect to the use or misuse of these tools, regardless of intent. Not anyone can be a student - the Accredited Training Centers (ATC) will make sure the applicants work for legitimate companies.This blog post was authored by hasherezade Ethical Hacking and Countermeasures course mission is to educate, introduce anddemonstrate hacking tools for penetration testing purposes only.Other tools are listed for testing by students in a lab environment. CEH v8 provides a detailed description of different industry-standard securitytools.CEH v8 showcases thousands of Hacking tools including password cracker, spyware, live Trojans and viruses.CEH v8 provides insights on new hacking techniques, networked environment and organized cybercrime.CEH v8 contains completely updated content on rapidly evolving security scenario and attack mechanisms. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |