# New Sig: ET TROJAN W32/Kazuar.Backdoor Turla APT Hardcoded Cookie

**URL:** <https://community.emergingthreats.net/t/new-sig-et-trojan-w32-kazuar-backdoor-turla-apt-hardcoded-cookie/1136>\
**Category:** Rule Signatures\
**Created:** [November 20, 2023, 4:53pm UTC](https://community.emergingthreats.net/t/new-sig-et-trojan-w32-kazuar-backdoor-turla-apt-hardcoded-cookie/1136 "2023-11-20T16:53:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kevross33](https://avatars.discourse-cdn.com/v4/letter/k/82dd89/32.png) [@kevross33](https://community.emergingthreats.net/u/kevross33)\
**Post date:** [November 20, 2023, 4:53pm UTC](https://community.emergingthreats.net/t/new-sig-et-trojan-w32-kazuar-backdoor-turla-apt-hardcoded-cookie/1136/1 "2023-11-20T16:53:45Z")

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Sig based on Unit42 article. HTTP POST over HTTPS with hardcoded Cookie value.

alert tcp $HOME\_NET any → $EXTERNAL\_NET $HTT\_PORTS (msg:“ET TROJAN W32/Kazuar.Backdoor Turla APT Hardcoded Cookie”; flow:established,to\_server; content:“POST”; http\_method; content:“MTY5NzM5ZTcyMTEyOTUxNDZhNjFkMzAwYzBmZWYwMmQ=”; http\_cookie; content:“\<”; http\_client\_body; depth:1; classtype:trojan-activity; reference:url,[Over the Kazuar’s Nest: Cracking Down on a Freshly Hatched Backdoor Used by Pensive Ursa (Aka Turla)](http://unit42.paloaltonetworks.com/pensive-ursa-uses-upgraded-kazuar-backdoor/); sid:121111; rev:1;)

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<div class="post-metadata">

**Author:** ![ishaughnessy](https://sea2.discourse-cdn.com/flex016/user_avatar/community.emergingthreats.net/ishaughnessy/32/491_2.png) [@ishaughnessy](https://community.emergingthreats.net/u/ishaughnessy)\
**Post date:** [November 20, 2023, 10:26pm UTC](https://community.emergingthreats.net/t/new-sig-et-trojan-w32-kazuar-backdoor-turla-apt-hardcoded-cookie/1136/2 "2023-11-20T22:26:22Z")

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hey @kevross33, thanks for the rule submission! Here is the final rule that went out in today’s release. 🥳

`alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Turla APT/Kazuar Backdoor CnC Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.cookie; content:"AspNet.Cookies=MTY5NzM5ZTcyMTEyOTUxNDZhNjFkMzAwYzBmZWYwMmQ="; bsize:59; fast_pattern; http.request_body; content:"|3c|"; depth:1; content:"|3e 3c|"; reference:url,community.emergingthreats.net/t/new-sig-et-trojan-w32-kazuar-backdoor-turla-apt-hardcoded-cookie/1136; reference:url,unit42.paloaltonetworks.com/pensive-ursa-uses-upgraded-kazuar-backdoor; classtype:trojan-activity; sid:2049264;)`