There are multiple reasons why malware would incorporate API hooking in its arsenal. Let's go into the details of this process and cover the APIs that malware authors generally hook in order to achieve their goals:
- Hiding malware presence (rootkits): For the malware to hide its presence from users and antivirus scanners, it may hook the following APIs:
- Process listing APIs such as Process32First and Process32Next so that it can remove the malware process from the results
- File listing APIs such as FindFirstFileA and FindNextFileA
- Registry enumeration APIs such as RegQueryInfoKey and RegEnumKeyEx
- Stealing banking details (banking Trojans): For the malware to capture HTTP messages, inject code into a bank home page, and capture sent username and pin codes, it usually hooks the following APIs:
- Internet communication functions such as InternetConnectA, HttpSendRequestA, InternetReadFile, and other wininet.dll APIs. WSARecv and WSASend from ws2_32.dll are another...
