Possible BGP hijack

Beginning at 2019-01-03 21:57:37 UTC, we detected a possible BGP hijack.

Prefix 138.117.133.0/24, is normally announced by AS61572 CONTROLADORIA-GERAL DA UNIÃO, BR.

But beginning at 2019-01-03 21:57:37, the same prefix (138.117.133.0/24) was also announced by ASN 3356.

This was detected by 175 BGPMon peers.

Expected
Start time: 2019-01-03 21:57:37 UTC
Expected prefix: 138.117.133.0/24
Expected ASN: 61572 (CONTROLADORIA-GERAL DA UNIÃO, BR)
Event Details
Detected advertisement: 138.117.133.0/24
Detected Origin ASN 3356 (LEVEL3 - Level 3 Parent, LLC, US)
Detected AS Path 30893 42708 1299 3356
Detected by number of BGPMon peers: 175

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