In this mode all virtual disk images are used in a read only fashion and sectors that are written are stored in temporary files gerridaeBy analyzing this behavior we try to decide whether the subject imposes a risk to a user or not Thus at the beginning of the execution of every translation block the instruction pointer is used as a key into this hash map and the corresponding callback is executed if a call to a system service is detected While the advertisements might be annoying, a more malicious behavior is exhibited by the BHO when it writes all visited URLs to a memory mapped section gerridaee