Versions (3)
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Rev: 1 • May 4, 2023, 12:00 PMET MALWARE Win32/Umbral-Stealer CnC Exfil via Discord (POST)
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Umbral-Stealer CnC Exfil via Discord (POST)"; flow:established,to_server; http.method; content:"POST"; http.host; content:"discord.com"; endswith; http.request_body; content:"|7b 22|title|22 3a 22|Umbral|20|Stealer|22 2c 22|description|22 3a 22|"; fast_pattern; content:"|22 2a 2a 5f 5f|System|20|Info|5f 5f 2a 2a 5c|r|5c|n"; content:"|5c|r|5c|n|5c|r|5c|n|2a 2a 5f 5f|Grabbed|20|Data|5f 5f 2a 2a 5c|r|5c|n|60 60 60|"; reference:url,twitter.com/suyog41/status/1654108795881005057; reference:url,github.com/Blank-c/Umbral-Stealer; classtype:trojan-activity; sid:2045593; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_04, deployment Perimeter, deployment SSLDecrypt, malware_family UmbralStealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_04;)
May 4, 2023, 12:00 PM
May 4, 2023, 12:00 PM
May 4, 2023, 9:00 PM
Aug 22, 2025, 9:34 PM
rules/emerging-malware.rules