tweak nitrogen loader rules

kevoreilly · Dec 2, 2024 · 56fb3fe · 56fb3fe
1 parent 3427c26
commit 56fb3fe
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Showing 2 changed files with 16 additions and 3 deletions.
diff --git a/analyzer/windows/data/yara/NitrogenLoader.yar b/analyzer/windows/data/yara/NitrogenLoader.yar
@@ -38,4 +38,17 @@ rule NitrogenLoaderBypass
 		$exit = {33 C9 E8 [4] E8 [4] 48 8D 84 24 [4] 48 89 44 24 ?? 4? B? E4 00 00 00 4? 8B 05 [4] B? 03 00 00 00 48 8D}
 	condition:
         all of them
-}
+}
+
+rule NitrogenLoaderConfig
+{
+    meta:
+        author = "enzok"
+        description = "NitrogenLoader Config Extraction"
+        cape_options = "bp0=$decrypt1*+6,hc0=1,count=0,action0=string:rcx,typestring=NitrogenLoader Config"
+    strings:
+        $decrypt1 = {48 8B 8C 24 [4] 0F B6 04 01 89 ?? 24 [1-4] 48 63 4C 24 ?? 33 D2 48 8B C1 48 F7 B4 24 [4] 48 8B C2 48 8B 8C}
+        $decrypt2 = {8B ?? 24 [1-4] 33 C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
+    condition:
+        all of them
+}
diff --git a/data/yara/CAPE/NitrogenLoader.yar b/data/yara/CAPE/NitrogenLoader.yar
@@ -16,8 +16,8 @@ rule NitrogenLoader
         $syscall = {48 83 C4 ?? 4? 8B 4C 24 ?? 4? 8B 54 24 ?? 4? 8B 44 24 ?? 4? 8B 4C 24 ?? 4? 89 CA 4? FF E3}
         $decryptstr1 = {33 D2 48 8B 04 24 B? 0C 00 00 00 48 F7 F1 48 8B C2 48 C1 E0 02 0F B6 C8 48 8B 44 24 ?? 48 D3 E8 48 25 AB 00 00 00}
         $decryptstr2 = {0F BE C0 48 8B 0C 24 48 8B 54 24 ?? 48 03 D1 48 8B CA 0F BE 09 33 C8 8B C1 48 8B 0C 24 48 8B 54 24 ?? 48 03 D1}
-        $decryptrsc1 = {48 63 44 24 ?? 48 8B 8C 24 [4] 0F B6 04 01 89 ?? 24 [1-4] 48 63 4C 24 ?? 33 D2 48 8B C1 48 F7 B4 24 [4] 48 8B C2}
-        $decryptrsc2 = {48 8B 8C 24 [4] 0F BE 04 01 8B ?? 24 [1-4] 33 C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
+        $decryptrsc1 = {48 8B 8C 24 [4] 0F B6 04 01 89 ?? 24 [1-4] 48 63 4C 24 ?? 33 D2 48 8B C1 48 F7 B4 24 [4] 48 8B C2 48 8B 8C}
+        $decryptrsc2 = {8B ?? 24 [1-4] 33 C8 8B C1 48 63 4C 24 ?? 48 8B 94 24 [4] 88 04 0A}
 	condition:
         (all of ($string*) or all of ($decrypt*)) and any of ($syscall*)
 }