Archive for the ‘Tools’ Category

So, while doing IT support for quite a few customers, I occasionally come across workstations infected different kinds of malware. Usually I clean up those infections. I know “Don’t do that, wipe it and reinstall” you say. But most small companies won’t pay or can’t afford that. So I remove those more or less nasty things.

Every now and then I put a copy of the malware on my thumbdrive to reverse engineer it. While doing that sometimes I come across a piece of malware that loads most of its imports at runtime. Some of those use hashes for the names of windows api functions. Instead of using LoadLibrary and GetProcAddress they use LoadLibrary (some also use the PEB for kernel32 or ntdll) to load libraries and calculate hashes on the exported functions.

Continue reading ‘APIhasher’ »