At.exe

Create a recurring task to execute every day at a specific time.

Use Create a recurring task, to eg. to keep reverse shell session(s) alive

C:\Windows\System32\at.exe 09:00 /interactive /every:m,t,w,th,f,s,su {CMD}

Evidence

Upstream reference

Environment

Local host

Context

admin

Native

Execute

MITRE

T1053.002

Detection

Sigma: github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_at_interactive_execution.yml

Sigma: github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/network/zeek/zeek_smb_converted_win_atsvc_task.yml

Sigma: github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/builtin/security/win_security_atsvc_task.yml

IOC: C:\Windows\System32\Tasks\At1 (substitute 1 with subsequent number of at job)

IOC: C:\Windows\Tasks\At1.job

IOC: Registry Key - Microsoft\Windows NT\CurrentVersion\Schedule\TaskCache\Tree\At1.

Refs

freddiebarrsmith.com/at.txt

sushant747.gitbooks.io/total-oscp-guide/privilege_escalation_windows.html

www.secureworks.com/blog/where-you-at-indicators-of-lateral-movement-using-at-exe-on-windows-7-systems

lolbas-project.github.io/lolbas/Binaries/At/