该包将检测针对 CVE-2021-42292（一个 Microsoft Excel 本地权限提升漏洞）的利用行为，并为其在 notice.log 中生成一条 notice 记录。
https://corelight.com/blog/detecting-cve-2021-42292
当触发漏洞的 Excel 电子表格下载第二个电子表格时，该包即可检测到此漏洞。第二个电子表格将以提升的权限执行。借助此脚本，我们可以检测 Microsoft Excel 下载 Microsoft Excel 文件的行为。在我们监控的一些真实网络测试中，这种组合极为罕见，截至目前我们未发现任何误报。
$ zeek -Cr excelsploit_1.pcap packages
$ cat notice.log
#separator \x09
#set_separator ,
#empty_field (empty)
#unset_field -
#path notice
#open 2021-11-10-10-56-50
#fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p fuid file_mime_type file_desc proto note msg sub src dst p n peer_descr actions email_dest suppress_for remote_location.country_code remote_location.region remote_location.city remote_location.latitude remote_location.longitude
#types time string addr port addr port string string string enum enum string string addr addr port count string set[enum] set[string] interval string string string double double
1636433584.277654 CeV1DA2EM1pRTfgWkc 127.0.0.1 51543 127.0.0.1 80 - - - tcp CVE_2021_42292::CVE_2021_42292 127.0.0.1 may be compromised by CVE-2021-42292, MS Office Excel download using Office from 127.0.0.1 detected. See sub field for additional triage information host='127.0.0.1', method='HEAD', user_agent='Microsoft Office Excel 2014', CONTENT-TYPE='application/vnd.ms-excel', uri='/replica.xls' 127.0.0.1 127.0.0.1 80 - - Notice::ACTION_LOG (empty) 3600.000000 - - - - -
1636433584.311236 CgKWSM1bhhl7K8B6n8 127.0.0.1 51545 127.0.0.1 80 - - - tcp CVE_2021_42292::CVE_2021_42292 127.0.0.1 may be compromised by CVE-2021-42292, MS Office Excel download using Office from 127.0.0.1 detected. See sub field for additional triage information host='127.0.0.1', method='GET', user_agent='Mozilla/4.0 (compatible; ms-office; MSOffice 16)', CONTENT-TYPE='application/vnd.ms-excel', uri='/replica.xls' 127.0.0.1 127.0.0.1 80 - - Notice::ACTION_LOG (empty) 3600.000000 - - - - -
#close 2021-11-10-10-56-50
此外，还提供了与 Zeek 包检测方法相一致的 Suricata 规则。