Possible BGP hijack

Beginning at 2023-01-11 15:40:51 UTC, we detected a possible BGP hijack.

Prefix 177.86.37.0/24, is normally announced by AS52940 NEMESIS Provedor de Acesso as Redes de Comunicacao, BR.

But beginning at 2023-01-11 15:40:51, the same prefix (177.86.37.0/24) was also announced by ASN 271373.

This was detected by 4 BGPMon peers.

Expected
Start time: 2023-01-11 15:40:51 UTC
Expected prefix: 177.86.37.0/24
Expected ASN: 52940 (NEMESIS Provedor de Acesso as Redes de Comunicacao, BR)
Event Details
Detected advertisement: 177.86.37.0/24
Detected Origin ASN 271373 (UPVC INTERNET CONQUISTA LTDA, BR)
Detected AS Path 263287 262868 263903 271373
Detected by number of BGPMon peers: 4

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