Add signature for JavaScript timer

Add signature for JavaScript timer usage when executing from a script process (possible evasion used in various scripts like GootLoader.

modules/signatures/windows/script_misc.py

@@ -0,0 +1,68 @@
+# Copyright (C) 2024 Kevin Ross 
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from lib.cuckoo.common.abstracts import Signature
+
+import re
+
+class JavaScriptTimer(Signature):
+    name = "javascript_timer"
+    description = "JavaScript timer detected to delay or measure execution time"
+    severity = 1
+    confidence = 50
+    categories = ["anti-sandbox"]
+    authors = ["Kevin Ross"]
+    minimum = "1.3"
+    evented = True
+
+    def __init__(self, *args, **kwargs):
+        Signature.__init__(self, *args, **kwargs)
+        self.ret = False
+        self.javascripttimer = [
+            "setinterval",
+            "settimeout",
+        ]
+
+    filter_apinames = set(["JsEval", "COleScript_ParseScriptText"])
+
+    def on_call(self, call, process):
+        if call["api"] == "JsEval":
+            pname = process["process_name"]
+            if pname.lower() in ["cscript.exe", "jscript.exe", "mshta.exe", "wscript.exe"]:
+                javascript = self.get_argument(call, "JavaScript")
+                if javascript:
+                    for javascripttimer in self.javascripttimer:
+                        if timer in javascript.lower():
+                            self.data.append({"process": pname})
+                            self.ret = True
+                            if self.pid:
+                                self.mark_call()
+                            break
+
+        if call["api"] == "COleScript_ParseScriptText":
+            pname = process["process_name"]
+            if pname.lower() in ["cscript.exe", "jscript.exe", "wscript.exe"]:
+                javascript = self.get_argument(call, "Script")
+                if javascript:
+                    for javascripttimer in self.javascripttimer:
+                        if javascripttimer in javascript.lower():
+                            self.data.append({"process": pname})
+                            self.ret = True
+                            if self.pid:
+                                self.mark_call()
+                            break
+
+    def on_complete(self):
+        return self.ret