Merge PR #5429 from @swachchhanda000 - Katz stealer malware

new: DNS Query To Katz Stealer Domains
new: Katz Stealer DLL Loaded
new: DNS Query To Katz Stealer Domains - Network
new: Katz Stealer Suspicious User-Agent
new: Suspicious File Access to Browser Credential Storage
new: Registry Export of Third-Party Credentials
update: Enumeration for 3rd Party Creds From CLI - Updated the condition to update FP

---------

Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>

rules-emerging-threats/2025/Malware/Katz-Stealer/dns_query_win_katz_stealer_domain.yml

@@ -0,0 +1,32 @@
+title: DNS Query To Katz Stealer Domains
+id: 9c3d6e32-f4c8-4d73-8b8f-95c3b383a13c
+related:
+    - id: 6b0c762f-0e1b-435f-a829-5943b08fe36a
+      type: similar
+status: experimental
+description: |
+    Detects DNS queries to domains associated with Katz Stealer malware.
+    Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems.
+    In Enterprise environments, DNS queries to these domains may indicate potential malicious activity or compromise.
+references:
+    - Internal Research
+author: Swachchhanda Shrawan Poudel (Nextron Systems)
+date: 2025-05-22
+tags:
+    - attack.command-and-control
+    - attack.t1071.004
+    - detection.emerging-threats
+logsource:
+    product: windows
+    category: dns_query
+detection:
+    selection:
+        QueryName|contains:
+            - 'katz-panel.com'
+            - 'katz-stealer.com'
+            - 'katzstealer.com'
+            - 'twist2katz.com'
+    condition: selection
+falsepositives:
+    - Unlikely
+level: high

rules-emerging-threats/2025/Malware/Katz-Stealer/image_load_win_katz_stealer_payloads.yml

@@ -0,0 +1,27 @@
+title: Katz Stealer DLL Loaded
+id: e6c7ab7c-c79d-4b84-b913-b2ec3f8e8a98
+status: experimental
+description: |
+    Detects loading of DLLs associated with Katz Stealer malware 2025 variants.
+    Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems.
+    The process that loads these DLLs are very likely to be malicious.
+references:
+    - Internal Research
+author: Swachchhanda Shrawan Poudel (Nextron Systems)
+date: 2025-05-22
+tags:
+    - attack.execution
+    - attack.t1129
+    - detection.emerging-threats
+logsource:
+    category: image_load
+    product: windows
+detection:
+    selection:
+        ImageLoaded|endswith:
+            - '\katz_ontop.dll'
+            - '\AppData\Local\Temp\received_dll.dll'
+    condition: selection
+falsepositives:
+    - Unlikely
+level: high

rules-emerging-threats/2025/Malware/Katz-Stealer/net_dns_katz_stealer_domain.yml

@@ -0,0 +1,31 @@
+title: DNS Query To Katz Stealer Domains - Network
+id: 6b0c762f-0e1b-435f-a829-5943b08fe36a
+related:
+    - id: 9c3d6e32-f4c8-4d73-8b8f-95c3b383a13c
+      type: similar
+status: experimental
+description: |
+    Detects DNS queries to domains associated with Katz Stealer malware.
+    Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems.
+    In Enterprise environments, DNS queries to these domains may indicate potential malicious activity or compromise.
+references:
+    - Internal research
+author: Swachchhanda Shrawan Poudel (Nextron Systems)
+date: 2025-05-22
+tags:
+    - attack.command-and-control
+    - attack.t1071.004
+    - detection.emerging-threats
+logsource:
+    category: dns
+detection:
+    selection:
+        query|contains:
+            - 'katz-panel.com'
+            - 'katz-stealer.com'
+            - 'katzstealer.com'
+            - 'twist2katz.com'
+    condition: selection
+falsepositives:
+    - Unlikely
+level: high

rules-emerging-threats/2025/Malware/Katz-Stealer/zeek_http_katz_stealer_susp_useragent.yml

@@ -0,0 +1,23 @@
+title: Katz Stealer Suspicious User-Agent
+id: 834c6d2f-5e98-4b2a-b453-0c4f234afedd
+status: experimental
+description: |
+    Detects network connections with a suspicious user-agent string containing "katz-ontop", which may indicate Katz Stealer activity.
+references:
+    - Internal Research
+author: Swachchhanda Shrawan Poudel (Nextron Systems)
+date: 2025-05-22
+tags:
+    - attack.command-and-control
+    - attack.t1071.001
+    - detection.emerging-threats
+logsource:
+    product: zeek
+    service: http
+detection:
+    selection:
+        user_agent|contains: 'katz-ontop'
+    condition: selection
+falsepositives:
+    - Unlikely
+level: high

rules/windows/file/file_access/file_access_win_susp_process_access_browser_cred_files.yml

@@ -0,0 +1,202 @@
+title: Suspicious File Access to Browser Credential Storage
+id: a1dfd976-4852-41d4-9507-dc6590a3ccd0
+status: experimental
+description: |
+    Detects file access to browser credential storage paths by non-browser processes, which may indicate credential access attempts.
+    Adversaries may attempt to access browser credential storage to extract sensitive information such as usernames and passwords or cookies.
+    This behavior is often commonly observed in credential stealing malware.
+references:
+    - https://github.com/splunk/security_content/blob/7283ba3723551f46b69dfeb23a63b358afb2cb0e/lookups/browser_app_list.csv?plain=1
+    - https://fourcore.io/blogs/threat-hunting-browser-credential-stealing
+author: frack113, X__Junior (Nextron Systems), Swachchhanda Shrawan Poudel (Nextron Systems), Parth-FourCore
+date: 2025-05-22
+tags:
+    - attack.credential-access
+    - attack.t1555.003
+    - attack.discovery
+    - attack.t1217
+logsource:
+    category: file_access
+    product: windows
+detection:
+    selection_browser_paths:
+        FileName|contains:
+            - '\Sputnik\Sputnik'
+            - '\MapleStudio\ChromePlus'
+            - '\QIP Surf'
+            - '\BlackHawk'
+            - '\7Star\7Star'
+            - '\CatalinaGroup\Citrio'
+            - '\Google\Chrome'
+            - '\Coowon\Coowon'
+            - '\CocCoc\Browser'
+            - '\uCozMedia\Uran'
+            - '\Tencent\QQBrowser'
+            - '\Orbitum'
+            - '\Slimjet'
+            - '\Iridium'
+            - '\Vivaldi'
+            - '\Chromium'
+            - '\GhostBrowser'
+            - '\CentBrowser'
+            - '\Xvast'
+            - '\Chedot'
+            - '\SuperBird'
+            - '\360Browser\Browser'
+            - '\360Chrome\Chrome'
+            - '\Comodo\Dragon'
+            - '\BraveSoftware\Brave-Browser'
+            - '\Torch'
+            - '\UCBrowser\'
+            - '\Blisk'
+            - '\Epic Privacy Browser'
+            - '\Nichrome'
+            - '\Amigo'
+            - '\Kometa'
+            - '\Xpom'
+            - '\Microsoft\Edge'
+            - '\Liebao7Default\EncryptedStorage'
+            - '\AVAST Software\Browser'
+            - '\Kinza'
+            - '\Mozilla\SeaMonkey\'
+            - '\Comodo\IceDragon\'
+            - '\8pecxstudios\Cyberfox\'
+            - '\FlashPeak\SlimBrowser\'
+            - '\Moonchild Productions\Pale Moon\'
+    selection_browser_subpaths:
+        FileName|contains:
+            - '\Profiles\'
+            - '\User Data'
+    selection_cred_files:
+        - FileName|contains:
+              - '\Login Data'
+              - '\Cookies'
+              - '\EncryptedStorage'
+              - '\WebCache\'
+        - FileName|endswith:
+              - 'cert9.db'
+              - 'cookies.sqlite'
+              - 'formhistory.sqlite'
+              - 'key3.db'
+              - 'key4.db'
+              - 'Login Data.sqlite'
+              - 'logins.json'
+              - 'places.sqlite'
+    filter_main_img:
+        Image|endswith:
+            - '\Sputnik.exe'
+            - '\ChromePlus.exe'
+            - '\QIP Surf.exe'
+            - '\BlackHawk.exe'
+            - '\7Star.exe'
+            - '\Sleipnir5.exe'
+            - '\Citrio.exe'
+            - '\Chrome SxS.exe'
+            - '\Chrome.exe'
+            - '\Coowon.exe'
+            - '\CocCocBrowser.exe'
+            - '\Uran.exe'
+            - '\QQBrowser.exe'
+            - '\Orbitum.exe'
+            - '\Slimjet.exe'
+            - '\Iridium.exe'
+            - '\Vivaldi.exe'
+            - '\Chromium.exe'
+            - '\GhostBrowser.exe'
+            - '\CentBrowser.exe'
+            - '\Xvast.exe'
+            - '\Chedot.exe'
+            - '\SuperBird.exe'
+            - '\360Browser.exe'
+            - '\360Chrome.exe'
+            - '\dragon.exe'
+            - '\brave.exe'
+            - '\torch.exe'
+            - '\UCBrowser.exe'
+            - '\BliskBrowser.exe'
+            - '\Epic Privacy Browser.exe'
+            - '\nichrome.exe'
+            - '\AmigoBrowser.exe'
+            - '\KometaBrowser.exe'
+            - '\XpomBrowser.exe'
+            - '\msedge.exe'
+            - '\LiebaoBrowser.exe'
+            - '\AvastBrowser.exe'
+            - '\Kinza.exe'
+            - '\seamonkey.exe'
+            - '\icedragon.exe'
+            - '\cyberfox.exe'
+            - '\SlimBrowser.exe'
+            - '\palemoon.exe'
+    filter_main_path:
+        Image|contains:
+            - '\Sputnik\'
+            - '\MapleStudio\'
+            - '\QIP Surf\'
+            - '\BlackHawk\'
+            - '\7Star\'
+            - '\Fenrir Inc\'
+            - '\CatalinaGroup\'
+            - '\Google\'
+            - '\Coowon\'
+            - '\CocCoc\'
+            - '\uCozMedia\'
+            - '\Tencent\'
+            - '\Orbitum\'
+            - '\Slimjet\'
+            - '\Iridium\'
+            - '\Vivaldi\'
+            - '\Chromium\'
+            - '\GhostBrowser\'
+            - '\CentBrowser\'
+            - '\Xvast\'
+            - '\Chedot\'
+            - '\SuperBird\'
+            - '\360Browser\'
+            - '\360Chrome\'
+            - '\Comodo\'
+            - '\BraveSoftware\'
+            - '\Torch\'
+            - '\UCBrowser\'
+            - '\Blisk\'
+            - '\Epic Privacy Browser\'
+            - '\Nichrome\'
+            - '\Amigo\'
+            - '\Kometa\'
+            - '\Xpom\'
+            - '\Microsoft\'
+            - '\Liebao7\'
+            - '\AVAST Software\'
+            - '\Kinza\'
+            - '\Mozilla\'
+            - '\8pecxstudios\'
+            - '\FlashPeak\'
+            - '\Moonchild Productions\'
+    filter_main_system:
+        Image: System
+        ParentImage: Idle
+    filter_main_generic:
+        Image|startswith:
+            - 'C:\Program Files\'
+            - 'C:\Program Files (x86)\'
+            - 'C:\Windows\System32\'
+            - 'C:\Windows\SysWOW64\'
+    filter_optional_defender:
+        Image|contains: '\Microsoft\Windows Defender\'
+        Image|endswith:
+            - '\MpCopyAccelerator.exe'
+            - '\MsMpEng.exe'
+    filter_optional_thor:
+        Image|endswith:
+            - '\thor.exe'
+            - '\thor64.exe'
+    filter_optional_msiexec:
+        ParentImage: 'C:\Windows\System32\msiexec.exe'
+    filter_optional_other:
+        Image|endswith: '\everything.exe'
+    condition: all of selection_* and not 1 of filter_main_* and not 1 of filter_optional_*
+falsepositives:
+    - Antivirus, Anti-Spyware, Anti-Malware Software
+    - Legitimate software accessing browser data for synchronization or backup purposes.
+    - Legitimate software installed on partitions other than "C:\"
+level: low

rules/windows/process_creation/proc_creation_win_registry_enumeration_for_credentials_cli.yml

@@ -3,6 +3,8 @@ id: 87a476dc-0079-4583-a985-dee7a20a03de
 related:
     - id: e0b0c2ab-3d52-46d9-8cb7-049dc775fbd1
       type: derived
+    - id: cc1abf27-78a3-4ac5-a51c-f3070b1d8e40
+      type: similar
 status: test
 description: Detects processes that query known 3rd party registry keys that holds credentials via commandline
 references:
@@ -12,6 +14,7 @@ references:
     - https://book.hacktricks.xyz/windows-hardening/windows-local-privilege-escalation#inside-the-registry
 author: Nasreddine Bencherchali (Nextron Systems)
 date: 2022-06-20
+modified: 2025-05-22
 tags:
     - attack.credential-access
     - attack.t1552.002
@@ -21,24 +24,30 @@ logsource:
 detection:
     selection:
         CommandLine|contains: # Add more paths as they are discovered
-            - '\Software\SimonTatham\PuTTY\Sessions'
-            - '\Software\\SimonTatham\PuTTY\SshHostKeys\'
-            - '\Software\Mobatek\MobaXterm\'
-            - '\Software\WOW6432Node\Radmin\v3.0\Server\Parameters\Radmin'
-            - '\Software\Aerofox\FoxmailPreview'
             - '\Software\Aerofox\Foxmail\V3.1'
-            - '\Software\IncrediMail\Identities'
-            - '\Software\Qualcomm\Eudora\CommandLine'
-            - '\Software\RimArts\B2\Settings'
-            - '\Software\OpenVPN-GUI\configs'
-            - '\Software\Martin Prikryl\WinSCP 2\Sessions'
-            - '\Software\FTPWare\COREFTP\Sites'
+            - '\Software\Aerofox\FoxmailPreview'
             - '\Software\DownloadManager\Passwords'
+            - '\Software\FTPWare\COREFTP\Sites'
+            - '\Software\IncrediMail\Identities'
+            - '\Software\Martin Prikryl\WinSCP 2\Sessions'
+            - '\Software\Mobatek\MobaXterm\'
             - '\Software\OpenSSH\Agent\Keys'
-            - '\Software\TightVNC\Server'
+            - '\Software\OpenVPN-GUI\configs'
             - '\Software\ORL\WinVNC3\Password'
+            - '\Software\Qualcomm\Eudora\CommandLine'
             - '\Software\RealVNC\WinVNC4'
-    condition: selection
+            - '\Software\RimArts\B2\Settings'
+            - '\Software\SimonTatham\PuTTY\Sessions'
+            - '\Software\SimonTatham\PuTTY\SshHostKeys\'
+            - '\Software\Sota\FFFTP'
+            - '\Software\TightVNC\Server'
+            - '\Software\WOW6432Node\Radmin\v3.0\Server\Parameters\Radmin'
+    filter_main_other_rule:  # matched by cc1abf27-78a3-4ac5-a51c-f3070b1d8e40
+        Image|endswith: 'reg.exe'
+        CommandLine|contains:
+            - 'export'
+            - 'save'
+    condition: selection and not 1 of filter_main_*
 falsepositives:
     - Unknown
 level: medium

rules/windows/process_creation/proc_creation_win_registry_export_of_thirdparty_creds.yml

@@ -0,0 +1,51 @@
+title: Registry Export of Third-Party Credentials
+id: cc1abf27-78a3-4ac5-a51c-f3070b1d8e40
+related:
+    - id: 87a476dc-0079-4583-a985-dee7a20a03de
+      type: similar
+status: experimental
+description: |
+    Detects the use of reg.exe to export registry paths associated with third-party credentials.
+    Credential stealers have been known to use this technique to extract sensitive information from the registry.
+references:
+    - https://www.virustotal.com/gui/file/fdc86a5b3d7df37a72c3272836f743747c47bfbc538f05af9ecf78547fa2e789/behavior
+author: Swachchhanda Shrawan Poudel (Nextron Systems)
+date: 2025-05-22
+tags:
+    - attack.credential-access
+    - attack.t1552.002
+logsource:
+    category: process_creation
+    product: windows
+detection:
+    selection_img:
+        - Image|endswith: '\reg.exe'
+        - OriginalFileName: 'reg.exe'
+    selection_cli_save:
+        CommandLine|contains:
+            - 'save'
+            - 'export'
+    selection_cli_path:
+        CommandLine|contains:
+            - '\Software\Aerofox\Foxmail\V3.1'
+            - '\Software\Aerofox\FoxmailPreview'
+            - '\Software\DownloadManager\Passwords'
+            - '\Software\FTPWare\COREFTP\Sites'
+            - '\Software\IncrediMail\Identities'
+            - '\Software\Martin Prikryl\WinSCP 2\Sessions'
+            - '\Software\Mobatek\MobaXterm'
+            - '\Software\OpenSSH\Agent\Keys'
+            - '\Software\OpenVPN-GUI\configs'
+            - '\Software\ORL\WinVNC3\Password'
+            - '\Software\Qualcomm\Eudora\CommandLine'
+            - '\Software\RealVNC\WinVNC4'
+            - '\Software\RimArts\B2\Settings'
+            - '\Software\SimonTatham\PuTTY\Sessions'
+            - '\Software\SimonTatham\PuTTY\SshHostKeys'
+            - '\Software\Sota\FFFTP'
+            - '\Software\TightVNC\Server'
+            - '\Software\WOW6432Node\Radmin\v3.0\Server\Parameters\Radmin'
+    condition: all of selection_*
+falsepositives:
+    - Unknown
+level: high