Why do I have DBSNMP running all the time the SQL 'BEGIN dbms_lock.sleep(60)?

@active

Oracle Database single instance 11.2.0.4. Without OEM nor grid user.

SQL> @active

    Remote     Remote  Shadow                                                                          Run

    SID   SER# User-Name    OS User    Process Proces SQL                                      MACHINE    Program              Secs         SQL_ID     ROWS_PROCESSED

  ------ ------ ------------ ---------- ------- ------ ---------------------------------------- ---------- -------------------- ------------ -------------- --------------

  14580  11743 DBSNMP       oracle     1234    31055  BEGIN dbms_lock.sleep(60); END;          dt3abpt101 JDBC Thin Client     00 00:00:51  g0bggfqrddc4w        31425

It runs all the time only at this DB. If I disconnect the session, it starts again. I see no trigger, dba scheduled job nor dba_job executing this. Autotasks are disabled.

Any guru knows if this SQL is related to OEM?