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Jameson Brown
Jameson Brown

IDA Pro 7.2 Leaked Update Download UPD Pc ~UPD~


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IDA Pro 7.2 Leaked Update Download Pc ~UPD~



By saving this as a binary (executable) file, we can then open it in dependency walker and see this is the file which not only contains the winexec imported function of kernel32, but also the URLDownloadToFile function of URLMON.DLL which indicates it will likely download and execute a file.


cmpsb is used to compare 2 sequences of bytes. It subtracts value at EDI from ESI and updates the flags. Cmpsb takes byte at ESI, compares to value at EDI and increments ESI/EDI registers by 1. Bundling this with rep is equivalent to memcmp in C.


By taking a look at what we know, we can examine the binary in question within IDA and see it creates a kernel service which is then used to stealthily update the registry to disable the Windows Firewall before being unloaded.


Based on all of this we can conclude that the overall purpose of this malware is to disable Windows File Protection, trojanize the legitimate wupdmgr.exe with a malicious executable which is designed to run the legitimate wupdmgr.exe executable. This acts as a dropper for another unknown executable which is downloaded and run from


In this instance 3 options cause a subroutine to be called, whereas one just updates a variable which is then used to quit the C2 loop and thus the program. The possible subroutines and their associated trigger letter are shown below.


Of interest is that we see what looks to be a broken tree whereby nothing happens after the file is written. If we examine this closely this is because of the impossible disassembly operation we encountered during analysis. What we can infer though is that this is supposed to then execute the file written to disk. Based on this we know that the program is a downloader and launcher designed to drop a file with double extensions and execute it.


Based on our analysis using scdbg in question 2, we know this downloads a binary to c:\WINDOWS\system32\1.exe. This is after retrieving the system directory, and indicates that filesystem residue would be found at:


Based on our analysis in questions 1 and 2, we know this shellcode decodes itself using an alphabetic encoding scheme where each payload byte is stored in the 4-bit low register of two encoded bytes added together. After this it resolves a number of imports and uses them to download a file from a URL to disk before executing it.


The stealer creates a random file name with a .exe extension and sets the stream Zone.Identifier of the file to [ZoneTransfer] ZoneId=2, which indicates that the file has been downloaded from a trusted site.


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