Trojan:W32/Injector.[variant], Trojan.JS.Injector.[variant], Injector.[variant], Trojan-Dropper.Win32.Injector.[variant]


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.


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Technical Details

About injection

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.

About Injector families

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.

Injector malware are most commonly (but not exclusively) Windows executable (EXE) and JavaScript files. As with any other malware, they may be delivered via spam emails, exploit kits or as part of the payload of another malware.

Consequences of code injection

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:

  • Corrupting the program's data
  • Granting unauthorized access to data
  • Crashing the program or causing a denial of service
  • Monitoring or manipulating web browser activity
  • Monitoring or manipulating user actions on the affected device
  • Downloading additional programs or components onto the affected device
  • Allowing a remote attacker to completely take control of the affected device

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