For quite sometime now the Feodo payload has been creating a service alongside a process.
This malware takes anti-analysis and stealth techniques to a new level We took a look at this malware in the Part 1 of this publication. Now let’s carry on with the analysis and dig deeper into the various anti-analysis and stealth-exec features of this malware in Part2. Malpedia Inventory: https://malpedia.caad.fkie.fraunhofer.de/details/vbs.grinju Secondary Macro Code First of all, here’s the entire code that is dumped in the sheet once all the macro functions have been completed. Take a look at these lines and try to figure out what they are meant to do. Then we’ll take a look at the most important of these briefly before moving on to the next section. =CLOSE(FALSE) =FORMULA(LEN(APP.MAXIMIZE())+-459,Sheet1!R18690C129) =FORMULA(LEN(GET.WINDOW(7))+-131,Sheet1!R18691C129) =FORMULA(LEN(GET.WINDOW(20))+-893,Sheet1!R18692C129) =FORMULA(LEN(GET.WINDOW(23)=3)+433,Sheet1!R18693C129) =FORMULA(LEN(GET.WORKSPACE(31))+864,Sheet1!R18694C129) =FORMULA(LEN(GET.WORKSPACE(13)>770)+707,Sheet1!R18