Skip navigation.
Home

Injecting Browser Helper Objects Remotely

|

Some system monitoring program gave me this message

A new startup program has been detected
D:\windows\system32\jkhfd.dll,c

which means that it is executing the function whose name is c which is exported by jkhfd.dll

I dissassembled the file(jkhfd.dll) and found the following list of exported functions-

c
DllCanUnloadNow
DllGetClassObject
f
InitSecurityInterfaceWLsaApCallPackage
LsaApCallPackagePassthrough
LsaApCallPackageUntrusted
LsaApInitializePackage
LsaApLogonTerminated
LsaApLogonUser
LsaApLogonUserEx
o
s
SpInitialize

(the function c, as I suspected, is exported)

Ssinternals tools told me that the above dll is there(injected?) as the browser helper objects

HKLM\Software\Micro$oft\Windows\CurrentVersion\Explorer\Browser Helper Objects
{B2CEFDCD-4318-4FD1-B87F-3E28D54ECF8D} d:\windows\system32\jkhfd.dll

From the above list of exported functions, most are implemented by the dll creator herself. But the win32 function(s) like LogonUser(which attempts to logon,probably remotely) has aroused my suspicion.

My questions-

Since the dissassembler can't locate the functions in the dissassembly, please suggest some other way of reversing the dll ?
Any further info on this method of attack, that is, how can someone remotely inject BHOs(browser helper objects) into my browser ?

Any further info on this

Any further info on this method of attack, that is, how can someone remotely inject BHOs(browser helper objects) into my browser ?

By using any of the hundreds of remote code execution vulnerabilities for your browser or any other software you use (or you clicking on an executable ;p ). Make sure all of your stuff is patched.