Injector trojans insert malicious code into processes running on a computer in order to perform various actions, such as downloading additional malware, interfering with web browsing activities or monitoring the user's actions.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
When any program is launched on a device, it will create one or more processes in the device's operating system to runs its instructions. When malware 'injects' code into one of the program's processes, the introduced code can force the program to behave unexpectedly.
For example, and more technically, a malware that does DLL injection could edit a program's registry key in the Windows Registry to force it to run a specially crafted dynamic-link library (DLL) file that includes instructions to perform the malicious actions.
Families that are identified by 'Injector' detections will usually have this as their main functionality, though many malware families will also use injection techniques as part of their arsenal for compromising a machine.
As there are many Injector malware families, the actions an Injector trojan can take differ greatly depending on the specific variant. The following are a few of the most typical behaviors:
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