""ET TROJAN Observed TA399/Sidewinder APT Domain (invitation-letter .govpk .info in TLS SNI)""
SID: 2055139
Revision: 1
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2024_08_08, deployment Perimeter, signature_severity Major, tag Sidewinder, tag TA399, updated_at 2024_08_08
Reference:
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md5
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43d35b5b20f491be219ab2eaa172ec55
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: 443
Flow: established,to_server
Contents:
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Value: "|16|"
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Value: "|01|"
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Value: "|00 00|"
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Value: "|00|"
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Value: "invitation-letter.govpk.info"
Within: 1
PCRE: "/^(?:\x00\x1c|.\x2e)invitation-letter.govpk.info/R"
Special Options: