Merge pull request #563 from mvt-project/feature/add-package-detections

Add additional detections for suspicious packages

src/mvt/android/modules/androidqf/packages.py

@@ -12,6 +12,8 @@ from mvt.android.utils import (
     PLAY_STORE_INSTALLERS,
     ROOT_PACKAGES,
     THIRD_PARTY_STORE_INSTALLERS,
+    SECURITY_PACKAGES,
+    SYSTEM_UPDATE_PACKAGES,
 )
 
 from .base import AndroidQFModule
@@ -62,14 +64,29 @@ class Packages(AndroidQFModule):
                     result["installer"],
                     result["name"],
                 )
+                self.detected.append(result)
             elif result["installer"] == "null" and result["system"] is False:
                 self.log.warning(
                     'Found a non-system package installed via adb or another method: "%s"',
                     result["name"],
                 )
+                self.detected.append(result)
             elif result["installer"] in PLAY_STORE_INSTALLERS:
                 pass
 
+            # Check for disabled security or software update packages
+            package_disabled = result.get("disabled", None)
+            if result["name"] in SECURITY_PACKAGES and package_disabled:
+                self.log.warning(
+                    'Security package "%s" disabled on the phone', result["name"]
+                )
+
+            if result["name"] in SYSTEM_UPDATE_PACKAGES and package_disabled:
+                self.log.warning(
+                    'System OTA update package "%s" disabled on the phone',
+                    result["name"],
+                )
+
             if not self.indicators:
                 continue
 
@@ -96,6 +113,10 @@ class Packages(AndroidQFModule):
                         self.detected.append(result)
                         break
 
+        # Deduplicate the detected packages
+        dedupe_detected_dict = {str(item): item for item in self.detected}
+        self.detected = list(dedupe_detected_dict.values())
+
     def run(self) -> None:
         packages = self._get_files_by_pattern("*/packages.json")
         if not packages:

tests/android_androidqf/test_packages.py

@@ -43,33 +43,56 @@ class TestAndroidqfPackages:
         # There should just be 7 packages listed, no detections
         assert len(module.results) == 7
         assert len(module.timeline) == 0
-        assert len(module.detected) == 0
 
     def test_non_appstore_warnings(self, caplog, module):
         run_module(module)
 
+        assert len(module.detected) == 4
+
         # Not a super test to be searching logs for this but heuristic detections not yet formalised
         assert (
             'Found a non-system package installed via adb or another method: "com.whatsapp"'
             in caplog.text
         )
+        whatsapp_detected = [
+            pkg for pkg in module.detected if pkg["name"] == "com.whatsapp"
+        ]
+        assert len(whatsapp_detected) == 1
+
         assert (
             'Found a package installed via a browser (installer="com.google.android.packageinstaller"): '
             '"app.revanced.manager.flutter"' in caplog.text
         )
+        revanced_detected = [
+            pkg
+            for pkg in module.detected
+            if pkg["name"] == "app.revanced.manager.flutter"
+        ]
+        assert len(revanced_detected) == 1
+
         assert (
             'Found a package installed via a third party store (installer="org.fdroid.fdroid"): "org.nuclearfog.apollo"'
             in caplog.text
         )
+        # We do not currently flag a third party store as a detection, we only flag the app in the logs.
+        appollo_detected = [
+            pkg for pkg in module.detected if pkg["name"] == "org.nuclearfog.apollo"
+        ]
+        assert len(appollo_detected) == 0
 
     def test_packages_ioc_package_names(self, module, indicators_factory):
         module.indicators = indicators_factory(app_ids=["com.malware.blah"])
 
         run_module(module)
 
-        assert len(module.detected) == 1
-        assert module.detected[0]["name"] == "com.malware.blah"
-        assert module.detected[0]["matched_indicator"]["value"] == "com.malware.blah"
+        possible_detected_app = [
+            pkg for pkg in module.detected if pkg["name"] == "com.malware.blah"
+        ]
+        assert len(possible_detected_app) == 1
+        assert possible_detected_app[0]["name"] == "com.malware.blah"
+        assert (
+            possible_detected_app[0]["matched_indicator"]["value"] == "com.malware.blah"
+        )
 
     def test_packages_ioc_sha256(self, module, indicators_factory):
         module.indicators = indicators_factory(
@@ -80,10 +103,13 @@ class TestAndroidqfPackages:
 
         run_module(module)
 
-        assert len(module.detected) == 1
-        assert module.detected[0]["name"] == "com.malware.muahaha"
+        possible_detected_app = [
+            pkg for pkg in module.detected if pkg["name"] == "com.malware.muahaha"
+        ]
+        assert len(possible_detected_app) == 1
+        assert possible_detected_app[0]["name"] == "com.malware.muahaha"
         assert (
-            module.detected[0]["matched_indicator"]["value"]
+            possible_detected_app[0]["matched_indicator"]["value"]
             == "31037a27af59d4914906c01ad14a318eee2f3e31d48da8954dca62a99174e3fa"
         )
 
@@ -96,9 +122,12 @@ class TestAndroidqfPackages:
 
         run_module(module)
 
-        assert len(module.detected) == 1
-        assert module.detected[0]["name"] == "com.malware.muahaha"
+        possible_detected_app = [
+            pkg for pkg in module.detected if pkg["name"] == "com.malware.muahaha"
+        ]
+        assert len(possible_detected_app) == 1
+        assert possible_detected_app[0]["name"] == "com.malware.muahaha"
         assert (
-            module.detected[0]["matched_indicator"]["value"]
+            possible_detected_app[0]["matched_indicator"]["value"]
             == "c7e56178748be1441370416d4c10e34817ea0c961eb636c8e9d98e0fd79bf730"
         )