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Merged
pull merged 4 commits into from
Mar 9, 2026
+9 −6
Merged

[pull] master from Neo23x0:master #127

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eaf5786
Update gen_github_net_redteam_tools_names.yar
ruppde Feb 23, 2026
6249950
Update gen_webshells.yar
ruppde Feb 23, 2026
9611b55
Update gen_imphash_detection.yar
ruppde Mar 9, 2026
8b8cef4
Merge pull request #391 from ruppde/master
Neo23x0 Mar 9, 2026
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2 changes: 2 additions & 0 deletions yara/gen_github_net_redteam_tools_names.yar
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,7 @@ rule HKTL_NET_NAME_SharpBuster {
(uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550) and all of them
}

/* removed, too many FP
rule HKTL_NET_NAME_AmsiBypass {
meta:
description = "Detects .NET red/black-team tools via name"
Expand All @@ -267,6 +268,7 @@ rule HKTL_NET_NAME_AmsiBypass {
(uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550) and all of ($s*)
and not 1 of ($fp*)
}
*/

rule HKTL_NET_NAME_Recon_AD {
meta:
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8 changes: 4 additions & 4 deletions yara/gen_imphash_detection.yar
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Expand Up @@ -300,7 +300,7 @@ rule SUSP_Imphash_Mar23_3 {
license = "Detection Rule License 1.1 https://github.com/SigmaHQ/Detection-Rule-License"
author = "Arnim Rupp (https://github.com/ruppde)"
date = "2023-03-23"
modified = "2025-08-15"
modified = "2026-03-09"
reference = "Internal Research"
score = 45
hash = "b5296cf0eb22fba6e2f68d0c9de9ef7845f330f7c611a0d60007aa87e270c62a"
Expand All @@ -320,10 +320,10 @@ rule SUSP_Imphash_Mar23_3 {
//pe.imphash() == "87bed5a7cba00c7e1f4015f1bdae2183" or // UPX imphash
//pe.imphash() == "09d0478591d4f788cb3e5ea416c25237" or // PECompact imphash
// pe.imphash() == "6ed4f5f04d62b18d96b26d6db7c18840" or // too many fp by now
// pe.imphash() == "0b5552dccd9d0a834cea55c0c8fc05be"
// pe.imphash() == "fc6683d30d9f25244a50fd5357825e79" or
pe.imphash() == "afcdf79be1557326c854b6e20cb900a7" or
pe.imphash() == "fc6683d30d9f25244a50fd5357825e79" or
pe.imphash() == "2c5f2513605e48f2d8ea5440a870cb9e" or
pe.imphash() == "0b5552dccd9d0a834cea55c0c8fc05be"
pe.imphash() == "2c5f2513605e48f2d8ea5440a870cb9e"
)
and pe.number_of_signatures == 0
}
5 changes: 3 additions & 2 deletions yara/gen_webshells.yar
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Expand Up @@ -961,9 +961,9 @@ rule WEBSHELL_PHP_Double_Eval_Tiny
license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
author = "Arnim Rupp (https://github.com/ruppde)"
reference = "Internal Research"
score = 75
score = 70
date = "2021-01-11"
modified = "2023-07-05"
modified = "2026-02-23"
hash = "f66fb918751acc7b88a17272a044b5242797976c73a6e54ac6b04b02f61e9761"
hash = "6b2f0a3bd80019dea536ddbf92df36ab897dd295840cb15bb7b159d0ee2106ff"
hash = "aabfd179aaf716929c8b820eefa3c1f613f8dcac"
Expand All @@ -977,6 +977,7 @@ rule WEBSHELL_PHP_Double_Eval_Tiny
$fp1 = "clone" fullword wide ascii
$fp2 = "* @assert" ascii
$fp3 = "*@assert" ascii
$fp4 = "--EXPECT--" ascii

//strings from private rule capa_php_old_safe
$php_short = "<?" wide ascii
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