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OCA file is a binary file that functions as an extended type library file and a cache for the custom control file (.OCX). There are also several suspicious strings like 'C:\windows\system32\wmp.oca', which we haven't seen in the quick analysis above. The quick dynamic analysis is fine, but debugging the file showed a lot of threads started early at runtime, and the sandbox report showed several artifacts that might be decoys. This unpacking method does not require any changes after dumping the unpacked sample. The dumped PE from this sample did not need to be fixed - it was a valid PE when loaded into RAM by the packer. This means the quick and dirty unpacking method for this packer is to break on CallWindowProcA until it points to non-library code, then break on ResumeThread and dump the suspended process. The following is a list of API calls by the Shellcode 'call eax' instructions: Today, you can find it on VT, but it still has a lot of generic and false classifications, most based on behaviour and machine learning indicators. Either way, it was difficult to classify. It looked malicious at worst and suspicious at best. And when we ran it against common antivirus software, we saw results similar to what's shown in the sandbox image below. When we looked at it, the file was not listed in VirusTotal. This is a sample packed with the aforementioned cryptor, but with a simple payload. We are using the sample 4533e1cd680b6be739fa6c12cbfc1b0bb96994a4f6355f26f2 for our deep dive into the VB6 cryptor. NET program with a GUI you can see in the image above. ![]() The Servador.exe file is copied to C:\Windows\SysWOW64\Windows\taskhost.exe. We will describe this in more detail below. One is called "Servidor.exe" ("5ff836d3f691c9e478bb86f7a0b216082062c747e6e3faa85df246ef5a5bfb32"), a sample packed with the VB6 cryptor which acts as a loader for XtremeRAT. The campaign described above used the Viotto Binder tool from Breaking Security to join two files which got dropped to %AppData%/Local/Temp. The one above installs XtremeRAT, a longstanding information stealer, for example. Unfortunately, these tools are providing a bit more than the promised tweaks or cheats, most of them are backdoored with RATs. The screenshot below shows an example of one. Many of these campaigns start with advertisements or "How To" videos on YouTube or other video game modding-related social media channels. This is a serious threat to enterprise networks. We need to go deeper cheat engine Pc#Employees will sometimes download modding tools or cheat engines from questionable sources to tweak their PC or games running on the same machine they use for their job. ![]() As workers continue to operate remotely during the COVID-19 pandemic and mix work with their private computer usage, enterprises are even more likely to be attacked by compromised personal PC equipment belonging to their employees. We have seen several small tools looking like game patches, tweaks or modding tools, but backdoored with malware obfuscated with this cryptor.ĭefenders need to be constantly vigilant and monitor the behavior of systems within their network. The adversaries use these gaming and OS modding tools to attach hidden malware to infect their victims. Video game players may opt to download certain cheats or modifications (aka "mods") to change the way some games are presented. These types of attacks are a return to form for classic virus campaigns - video game players are no strangers to trying to avoid malicious downloads while trying to change the game they're playing. Our analysis provides insight into the adversaries' tactics and how the crypter works in detail. The cryptor in this campaign uses several obfuscation techniques that makes it difficult to dissect, and could pose a challenge for security analysts not familiar with Visual Basic 6. ![]() We need to go deeper cheat engine full#We have a full analysis of the VB6 header of one of the samples used in these campaigns and provide a detailed walkthrough for security analysts. The cryptor uses Visual Basic 6 along with shellcode and process injection techniques. ![]() We need to go deeper cheat engine install#Talos detected a new cryptor used in several different malware campaigns hidden in seemingly legitimate files that users would usually download to install cheat codes into video games or other visual and game modifications (aka "mods"). By Nick Lister and Holger Unterbrink, with contributions from Vanja Svajcer.Ĭisco Talos recently discovered a new campaign targeting video game players and other PC modders. ![]()
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