[WINPEAS] Add privilege escalation check: Inside Ink Dragon Revealing the Relay Ne...

winPEAS/winPEASexe/README.md

@@ -76,6 +76,7 @@ The goal of this project is to search for possible **Privilege Escalation Paths*
 
 New in this version:
 - Detect potential GPO abuse by flagging writable SYSVOL paths for GPOs applied to the current host and by highlighting membership in the "Group Policy Creator Owners" group.
+- Highlight disconnected high-privilege RDP sessions so you can plan LSASS/token theft when admins leave idle sessions (Ink Dragon-style escalation).
 
 
 It should take only a **few seconds** to execute almost all the checks and **some seconds/minutes during the lasts checks searching for known filenames** that could contain passwords (the time depened on the number of files in your home folder). By default only **some** filenames that could contain credentials are searched, you can use the **searchall** parameter to search all the list (this could will add some minutes).

winPEAS/winPEASexe/winPEAS/Checks/UserInfo.cs

@@ -156,15 +156,63 @@ void PrintRdpSessions()
             try
             {
                 Beaprint.MainPrint("RDP Sessions");
+                Beaprint.LinkPrint("https://book.hacktricks.wiki/en/windows-hardening/windows-local-privilege-escalation/credentials-mgmt/rdp-sessions", "Disconnected high-privilege RDP sessions keep reusable tokens inside LSASS.");
                 List<Dictionary<string, string>> rdp_sessions = UserInfoHelper.GetRDPSessions();
                 if (rdp_sessions.Count > 0)
                 {
-                    string format = "    {0,-10}{1,-15}{2,-15}{3,-25}{4,-10}{5}";
-                    string header = string.Format(format, "SessID", "pSessionName", "pUserName", "pDomainName", "State", "SourceIP");
+                    string format = "    {0,-8}{1,-15}{2,-20}{3,-22}{4,-15}{5,-18}{6,-10}";
+                    string header = string.Format(format, "SessID", "Session", "User", "Domain", "State", "SourceIP", "HighPriv");
                     Beaprint.GrayPrint(header);
+                    var colors = ColorsU();
+                    List<Dictionary<string, string>> flaggedSessions = new List<Dictionary<string, string>>();
                     foreach (Dictionary<string, string> rdpSes in rdp_sessions)
                     {
-                        Beaprint.AnsiPrint(string.Format(format, rdpSes["SessionID"], rdpSes["pSessionName"], rdpSes["pUserName"], rdpSes["pDomainName"], rdpSes["State"], rdpSes["SourceIP"]), ColorsU());
+                        rdpSes.TryGetValue("SessionID", out string sessionId);
+                        rdpSes.TryGetValue("pSessionName", out string sessionName);
+                        rdpSes.TryGetValue("pUserName", out string userName);
+                        rdpSes.TryGetValue("pDomainName", out string domainName);
+                        rdpSes.TryGetValue("State", out string state);
+                        rdpSes.TryGetValue("SourceIP", out string sourceIp);
+
+                        sessionId = sessionId ?? string.Empty;
+                        sessionName = sessionName ?? string.Empty;
+                        userName = userName ?? string.Empty;
+                        domainName = domainName ?? string.Empty;
+                        state = state ?? string.Empty;
+                        sourceIp = sourceIp ?? string.Empty;
+
+                        bool isHighPriv = UserInfoHelper.IsHighPrivilegeAccount(userName, domainName);
+                        string highPrivLabel = isHighPriv ? "Yes" : "No";
+                        rdpSes["HighPriv"] = highPrivLabel;
+
+                        if (isHighPriv && string.Equals(state, "Disconnected", StringComparison.OrdinalIgnoreCase))
+                        {
+                            flaggedSessions.Add(rdpSes);
+                        }
+
+                        Beaprint.AnsiPrint(string.Format(format, sessionId, sessionName, userName, domainName, state, sourceIp, highPrivLabel), colors);
+                    }
+
+                    if (flaggedSessions.Count > 0)
+                    {
+                        Beaprint.BadPrint("    [!] Disconnected high-privilege RDP sessions detected. Their credentials/tokens stay in LSASS until the user signs out.");
+                        foreach (Dictionary<string, string> session in flaggedSessions)
+                        {
+                            session.TryGetValue("pDomainName", out string flaggedDomain);
+                            session.TryGetValue("pUserName", out string flaggedUser);
+                            session.TryGetValue("SessionID", out string flaggedSessionId);
+                            session.TryGetValue("SourceIP", out string flaggedIp);
+
+                            flaggedDomain = flaggedDomain ?? string.Empty;
+                            flaggedUser = flaggedUser ?? string.Empty;
+                            flaggedSessionId = flaggedSessionId ?? string.Empty;
+                            flaggedIp = flaggedIp ?? string.Empty;
+
+                            string userDisplay = string.Format("{0}\\{1}", flaggedDomain, flaggedUser).Trim('\\');
+                            string source = string.IsNullOrEmpty(flaggedIp) ? "local" : flaggedIp;
+                            Beaprint.BadPrint(string.Format("        -> Session {0} ({1}) from {2}", flaggedSessionId, userDisplay, source));
+                        }
+                        Beaprint.LinkPrint("https://book.hacktricks.wiki/en/windows-hardening/windows-local-privilege-escalation/credentials-mgmt/rdp-sessions", "Dump LSASS / steal tokens (e.g., comsvcs.dll, LsaLogonSessions, custom SSPs) to reuse those privileges.");
                     }
                 }
                 else

winPEAS/winPEASexe/winPEAS/Info/UserInfo/UserInfoHelper.cs

@@ -16,6 +16,20 @@ namespace winPEAS.Info.UserInfo
 {
     class UserInfoHelper
     {
+        private static readonly Dictionary<string, bool> _highPrivAccountCache = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase);
+        private static readonly string[] _highPrivGroupIndicators = new string[]
+        {
+            "administrators",
+            "domain admins",
+            "enterprise admins",
+            "schema admins",
+            "server operators",
+            "account operators",
+            "backup operators",
+            "dnsadmins",
+            "hyper-v administrators"
+        };
+
         // https://stackoverflow.com/questions/5247798/get-list-of-local-computer-usernames-in-windows
 
 
@@ -91,6 +105,65 @@ public static PrincipalContext GetPrincipalContext()
             return oPrincipalContext;
         }
 
+        public static bool IsHighPrivilegeAccount(string userName, string domain)
+        {
+            if (string.IsNullOrWhiteSpace(userName))
+            {
+                return false;
+            }
+
+            string cacheKey = ($"{domain}\\{userName}").Trim('\\');
+            if (_highPrivAccountCache.TryGetValue(cacheKey, out bool cached))
+            {
+                return cached;
+            }
+
+            bool isHighPriv = false;
+            try
+            {
+                string resolvedDomain = string.IsNullOrWhiteSpace(domain) ? Checks.Checks.CurrentUserDomainName : domain;
+                List<string> groups = User.GetUserGroups(userName, resolvedDomain);
+                foreach (string group in groups)
+                {
+                    if (IsHighPrivilegeGroup(group))
+                    {
+                        isHighPriv = true;
+                        break;
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Beaprint.GrayPrint(string.Format("  [-] Unable to resolve groups for {0}\\{1}: {2}", domain, userName, ex.Message));
+            }
+
+            if (!isHighPriv)
+            {
+                isHighPriv = string.Equals(userName, "administrator", StringComparison.OrdinalIgnoreCase) || userName.StartsWith("admin", StringComparison.OrdinalIgnoreCase);
+            }
+
+            _highPrivAccountCache[cacheKey] = isHighPriv;
+            return isHighPriv;
+        }
+
+        private static bool IsHighPrivilegeGroup(string groupName)
+        {
+            if (string.IsNullOrWhiteSpace(groupName))
+            {
+                return false;
+            }
+
+            foreach (string indicator in _highPrivGroupIndicators)
+            {
+                if (groupName.IndexOf(indicator, StringComparison.OrdinalIgnoreCase) >= 0)
+                {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
         //From Seatbelt
         public enum WTS_CONNECTSTATE_CLASS
         {