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Address false positives for Chromium, KOTS, and Nuclei #368

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merged 5 commits into from
Jul 17, 2024
Merged

Address false positives for Chromium, KOTS, and Nuclei #368

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37e44fc
Address false positives for Chromium, KOTS, and Nuclei
egibs Jul 17, 2024
e3ef132
Add additional Chromium string
egibs Jul 17, 2024
beae9ef
Sort
egibs Jul 17, 2024
aa4b3d7
More specific string for kots
egibs Jul 17, 2024
4dfaa26
Chromium rule parity
egibs Jul 17, 2024
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6 changes: 6 additions & 0 deletions rules/combo/stealer/browser.yara
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,9 @@ rule multiple_browser_refs : critical {
$name_opera = "Opera Software"
$name_yandex = "YandexBrowser"
$not_chromium = "ChromiumBrowser"
$not_chromium_comment = "When this is enabled, Chromium can use"
$not_chromium_issues = "https://issues.chromium.org/"
$not_google = "developed by Google"
$not_google_chrome_software = "The Google Chrome software"
$not_bugzilla = "https://bugzilla.mozilla.org"
Expand Down Expand Up @@ -87,6 +90,9 @@ rule userdata_browser_archiver : medium {
$b_Safari = "Safari"
$b_Chrome = "Chrome"
$not_chromium = "ChromiumBrowser"
$not_chromium_comment = "When this is enabled, Chromium can use"
$not_chromium_issues = "https://issues.chromium.org/"
$not_google = "developed by Google"
$not_google_chrome_software = "The Google Chrome software"
$not_bugzilla = "https://bugzilla.mozilla.org"
Expand Down
9 changes: 8 additions & 1 deletion rules/combo/stealer/wallet.yara
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Expand Up @@ -24,6 +24,13 @@ rule crypto_stealer : critical {
$w_trezor = "Trezor"
$w_exodus = "Exodus"
$w_coinomi = "Coinomi"
$not_cats = /\"cats\": \[[^]]{0,64}/
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@egibs egibs Jul 17, 2024 •
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This isn't an exhaustive representation of the Wapalyzer schema but these strings should be broad enough to match content from those technology files.

$not_description = /\"description\": "([^"]{0,64})"/
$not_dom = /\"dom\": "([^"]{0,64})"/
$not_icon = /\"icon\": "([^"]{0,64})"/
$not_js = /\"js\": \{[^}]{0,64}/
$not_scriptsrc = /\"scriptSrc\": "([^"]{0,64})"/
$not_website = /\"website\": "([^"]{0,64})"/
condition:
$http and 2 of ($w*)
$http and 2 of ($w*) and none of ($not*)
}
2 changes: 2 additions & 0 deletions rules/evasion/base64-php_functions.yara
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Expand Up @@ -59,6 +59,7 @@ rule base64_php_functions : medium {
$f_wp_nonce_field = "wp_nonce_field" base64
$f_wp_verify_nonce = "wp_verify_nonce" base64

$not_comment = "// processing instruction, e.g. <?php ?>"
$not_mongosh_php = { 3C 3F 70 68 70 00 00 00 01 0C 51 61 03 00 00 00 02 00 00 00 3F 3E }
condition:
$php and $base64_decode and any of ($f_*) and none of ($not*)
Expand Down Expand Up @@ -124,6 +125,7 @@ rule base64_php_functions_multiple : critical {
$f_wp_nonce_field = "wp_nonce_field" base64
$f_wp_verify_nonce = "wp_verify_nonce" base64

$not_comment = "// processing instruction, e.g. <?php ?>"
$not_mongosh_php = { 3C 3F 70 68 70 00 00 00 01 0C 51 61 03 00 00 00 02 00 00 00 3F 3E }
condition:
$php and $base64_decode and 2 of ($f_*) and none of ($not*)
Expand Down