taskeng.exe
Sources: 300M+ executions observed in the wild.
Summary
Task Scheduler Engine (taskeng.exe) is the older Windows task execution host process, used on Windows 7 and Server 2008/2012. It was replaced by taskhostw.exe in Windows 8+. It loads and executes scheduled tasks on behalf of the Task Scheduler service.
taskeng.exe is the 88th most commonly executed Windows program in EchoTrail's dataset, observed 286,838 times across enterprise environments. It typically runs from C:\Windows\System32 and it is most often launched by svchost.exe.
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Behavior
Top Paths
- C:\Windows\System32100%
Top Hashes (SHA256)
- 74b9cf472d5008e00735482f084f886eaa201248d6e87ab6b1990e3670bd669350.51%
- f9895859162a0d3c622b64023ab01dfdc3abdd8ac72753dbafddb675ba9ab84529%
- 5fdcf73191bff9dbb03886755ffcf0bc15849f0e216884a5a8b9bb375fa7c1a517.37%
- 42e21c185080184ecd3ec8ada9a8877c7fac934a74122770c085d2f85f56e8da1.69%
- 681fb7410d95f1dd98c34d72bd2ef1d49090f271698d05871d0ccacc01474b7d1.04%
- 2c9db6c27509847a755eb75f0f55e28f9b64a5d4c5872bfa9ba024088f4e536a0.25%
- 1116d08baddc34b647d587750697444dac76ae1068a43c4812577a2fd44266a70.13%
- 425a1a21a4dbc212c3c3db5f8fecdd6235e7e7fe2fcfce3affe3f9f80aa24a92<0.01%
Process Ancestry
Top Grandparents
- services.exe100%
Top Parents
- svchost.exe100%
Top Children
- GoogleUpdate.exe28.8%
- powershell.exe21.28%
- MicrosoftEdgeUpdate.exe14.31%
- DropboxUpdate.exe8.38%
- g2mupdate.exe4.41%
- dcagentupgrader.exe3.93%
- g2mupload.exe2.2%
- wsceaa.exe1.79%
Security Analysis
What does taskeng.exe normally do?
Located in C:\Windows\System32. Launched by svchost.exe (Task Scheduler service). Children are the processes launched by scheduled tasks — commonly GoogleUpdate.exe, powershell.exe, MicrosoftEdgeUpdate.exe, DropboxUpdate.exe.
When is taskeng.exe suspicious?
Same as taskhostw.exe — the concern is the scheduled task being executed, not taskeng.exe itself. Spawning unexpected shells, scripts, or executables from unusual paths. Parent other than svchost.exe.
How do attackers abuse taskeng.exe?
Same as taskhostw.exe. Malicious scheduled tasks execute through taskeng.exe on older Windows versions. The task definition is the malicious component.
Detection guidance
Same approach as taskhostw.exe. Monitor child processes of taskeng.exe. Correlate with Task Scheduler event logs (Event IDs 106, 200, 201). Investigate scheduled tasks that launch shells or run from non-standard paths.
False positive notes
Software updaters (Google, Microsoft, Dropbox) are the most common children. PowerShell scripts via scheduled tasks are common for legitimate administration.
MITRE ATT&CK techniques
Related Processes
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