Create injection_writememory.py

modules/signatures/windows/injection_writememory.py

@@ -0,0 +1,86 @@
+# 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
+
+class InjectionWriteRemoteProcess(Signature):
+    name = "injection_write_process"
+    description = "Writes to the memory another process"
+    severity = 2
+    categories = ["injection", "unpacking"]
+    authors = ["Kevin Ross"]
+    minimum = "1.3"
+    evented = True
+    ttps = ["T1055"]  # MITRE v6,7,8
+
+    filter_apinames = set(["NtWow64WriteVirtualMemory64", "WriteProcessMemory", "NtWriteVirtualMemory"])
+
+    def __init__(self, *args, **kwargs):
+        Signature.__init__(self, *args, **kwargs)
+        self.ret = False
+        self.sourcepids = []
+        self.targethandles = []
+
+    def on_call(self, call, process):
+            prochandle = self.get_argument(call, "ProcessHandle")
+            if prochandle not in ("0x00000000","0x0000000000000000","0xffffffff","0xffffffffffffffff"):
+                pname = process["process_name"].lower()
+                processid = process["process_id"]
+                if processid not in self.sourcepids and prochandle not in self.targethandles:
+                    self.data.append({"write_memory": "Process %s with process ID %s wrote to the memory of process handle %s" % (pname, processid, prochandle)})
+                    self.sourcepids.append(processid)
+                    self.targethandles.append(prochandle)
+                self.mark_call()
+                self.ret = True
+
+    def on_complete(self):
+        return self.ret
+
+class InjectionWriteEXEProcess(Signature):
+    name = "injection_write_exe_process"
+    description = "Writes an executable to the memory of another process"
+    severity = 3
+    categories = ["injection", "unpacking"]
+    authors = ["Kevin Ross"]
+    minimum = "1.3"
+    evented = True
+    ttps = ["T1055"]  # MITRE v6,7,8
+
+    filter_apinames = set(["NtWow64WriteVirtualMemory64", "WriteProcessMemory", "NtWriteVirtualMemory"])
+
+    def __init__(self, *args, **kwargs):
+        Signature.__init__(self, *args, **kwargs)
+        self.ret = False
+        self.handles = []
+        self.sourcepids = []
+        self.targethandles = []
+
+    def on_call(self, call, process):
+            prochandle = self.get_argument(call, "ProcessHandle")
+            if prochandle not in ("0x00000000","0x0000000000000000","0xffffffff","0xffffffffffffffff"):
+                if self.get_argument(call, "Buffer").startswith("MZ") or prochandle in self.handles:
+                    pname = process["process_name"].lower()
+                    processid = process["process_id"]
+                    if prochandle not in self.handles:
+                        self.handles.append(prochandle)
+                    if processid not in self.sourcepids and prochandle not in self.targethandles:
+                        self.data.append({"write_exe_memory": "Process %s with process ID %s wrote an executable to the process handle %s" % (pname, processid, prochandle)})
+                        self.sourcepids.append(processid)
+                        self.targethandles.append(prochandle)
+                    self.mark_call()
+                    self.ret = True
+
+    def on_complete(self):
+        return self.ret