currently serving 23484 YARA rules and 4343 Sigma rules
API Key
New Rules per Day
Newest YARA Rules
This table shows the newest additions to the YARA rule set
Rule
Description
Date
Ref
MAL_JS_AI_Conversation_Stealer_Jan26
Detects malicious JavaScript stealing information from ChatGPT and DeepSeek conversations.
12.01.2026
MAL_JS_AI_Conversation_Stealer_Jan26_2
Detects malicious JavaScript stealing information from ChatGPT and DeepSeek conversations.
12.01.2026
SUSP_JS_AI_Conversation_Stealer_Jan26
Detects suspicious JavaScript stealing information from ChatGPT and DeepSeek conversations.
12.01.2026
SUSP_Data_Exfilteration_To_Telegram_Jan26
Detects indicators commonly associated with stealer malware, which aims to exfiltrate sensitive information from infected systems to a Telegram bot
08.01.2026
SUSP_Credential_Stealer_Indicators_Jan26
Detects common indicators for credential stealer malware, matches warrant further analysis.
07.01.2026
MAL_GravityRAT_Jan26
Detects GravityRAT payloads. GravityRAT focusses on exfiltration of sensitive data and features extensive anti analysis features.
06.01.2026
MAL_Warlock_AV_Terminator_Jan26
Detects a user-mode application that communicates with a kernel-mode driver to terminate antivirus processes by their names
06.01.2026
MAL_AV_Terminator_Driver_Jan26
Detects a kernel-mode driver that terminates antivirus processes by their names, used in conjunction with a user-mode application for antivirus evasion
06.01.2026
MAL_NET_Loader_Jan26
Detects .NET based loader, used by various threat actors like Katzstealer etc.
05.01.2026
SUSP_Antivirus_Evasion_Jan26
Detects suspicious antivirus evasion techniques used by malware to identify installed security products on the target system
03.01.2026
MAL_Log_Tamper_Jan26
Detects binary that is used to hide interactive logins and failed logins.
02.01.2026
MAL_Process_Enumeration_Jan26
Detects process enumration functionality written in Python, that could indicate sandbox evasion
02.01.2026
MAL_Distopia_Jan26
Detects Distopia a Remote Administration Tool that uses Discord, Telegram and GitHub as C2s
02.01.2026
MAL_BabShell_Jan26
Detects BabShell a reverse shell tool written in C++ that enables attackers to connect to a compromised system
01.01.2026
MAL_ShellCode_Dec25
Detects shellcode that decrypts and executes a payload, seen being used by Plugx APT group
30.12.2025
MAL_CanonStager_Dec25
Detects CanonStager loader that resolves APIs, decrypts and loads payload, seen being used by Plugx APT group
30.12.2025
APT_MAL_UAC0184_DLL_Sideload_Dec25
Detects a DLL that uses hardcoded offset jumps to bypass standard API resolution in UAC-0184 attack chain, seen being used by UAC-0184 APT group
29.12.2025
APT_MAL_UAC0184_DLL_Loader_Dec25
Detects a DLL with hardcoded shellcode entry performing PNG-based payload decryption and module stomping, seen being used by UAC-0184 APT group
29.12.2025
MAL_Tomiris_C_ReverseSock_Dec25
Detects a reverse SOCKS proxy written in C++, seen being used by Tomiris threat actor
29.12.2025
MAL_PYC_Distopia_Dec25
Detects Distopia backdoor that is based entirely on the GitHub repository project dystopia-c2 and is written in Python
29.12.2025
MAL_FoalShell_Golang_Dec25
Detects a simple reverse shell written in Go, seen being used by Tomiris threat actor
26.12.2025
MAL_FoalShell_CPP_Dec25
Detects a simple reverse shell written in C, seen being used by Tomiris threat actor
26.12.2025
MAL_Tomiris_RShell_Dec25
Detects a reverse shell that waits for commands from the operator, seen being used by Tomiris threat actor
26.12.2025
Successful YARA Rules in Set
This table shows statistics of the best rules with lowest AV detection rates (rules created in the last 12 months, matches of the last 14 days)
Rule
Average AV Detection Rate
Sample Count
Info
VT
Latest YARA Matches with Low AV Detection Rate
This table lists the last matches with low AV detection rates (between 0 and 15 AV engines matched)
Rule
AVs
Hash
VT
PUA_ConnectWise_ScreenConnect_Mar23
6
e7885f66b08d60eed832e4caea93364aa6193d01c6c40cd96a2d492bb1aefba3
SUSP_PS1_Command_Rare_CmdLine_Arguments_Jan20
6
18e16c5555c43e46bb4d202609c3e6c62abc9aac292dd31d2220be61755872f1
PUA_ConnectWise_ScreenConnect_Mar23
6
5f23e6b502c532ca0b5a97d330f7712a8b58b89eddb44bd94651917ef7080e6d
SUSP_Indicator_TokenManipulation_Nov22_1
12
9c375ffa7388decb6bd1d826357399fefea44b1908006f7e5c2e501620298957
SUSP_MSIL_NET_OBF_ConfuserEx_Constants_Jul23
11
15336c0445ecd7b86348fec99c787e3dd21a4f194efeb7f49b02a608252e34b0
SUSP_GO_Screenshot_Capable_Oct22
12
234dadfb945e00908450b0beaf75a2e914aa41583b4b6b2c148980aff6fb20c2
SUSP_Go_Binary_Function_Name_Oct24
12
234dadfb945e00908450b0beaf75a2e914aa41583b4b6b2c148980aff6fb20c2
SUSP_MPRESS_MS_Copyright_May21_1
10
8a946cdbf8b1be0988fbd96caed706a64bb50fcfa8736162969bb31ca0be995f
SUSP_OBF_NET_Reactor_JIT_Encryption_Feb25
6
8bb45f887c1f6102cf93922c70a8e8e83c2f55826c56d1533f1dbd3177a4b2e9
YARA Rules Per Category
This list shows the number of YARA rules in the subscribable categories (categories overlap as a rule can be in 'n' categories)
Tag
Count
Malware
7370
Threat Hunting (not subscribable, only in THOR scanner)
5737
APT
5043
Hacktools
4798
Webshells
2397
Exploits
712
Newest Sigma Rules
This table shows the newest additions to the Sigma rule set
Rule
Description
Date
Ref
Info
Linux Suspicious Child Process from Node.js - React2Shell
Detects suspicious child processes spawned from Node.js server processes on Linux systems, potentially indicating remote code execution exploitation such as CVE-2025-55182 (React2Shell).
This rule particularly looks for exploitation of vulnerability on Node.js Servers where attackers abuse Node.js child_process module to execute arbitrary system commands.
When execSync() or exec() is used, the command line often includes a shell invocation followed by suspicious commands or scripts (e.g., /bin/sh -c <malicious-command>).
For other methods, the Image field will show the spawned process directly.
05.12.2025
Windows Suspicious Child Process from Node.js - React2Shell
Detects suspicious child processes started by Node.js server processes on Windows, which may indicate exploitation of vulnerabilities like CVE-2025-55182 (React2Shell).
Attackers can abuse the Node.js 'child_process' module to run system commands or scripts using methods such as spawn(), exec(), execFile(), fork(), or execSync().
If execSync() or exec() is used in the exploit, the command line often shows a shell (e.g., cmd.exe /d /s /c ...) running a suspicious command unless other shells are explicitly invoked.
For other methods, the spawned process appears directly in the Image field unless a shell is explicitly used.
05.12.2025
Github Self-Hosted Runner Execution
Detects GitHub self-hosted runners executing workflows on local infrastructure that could be abused for persistence and code execution.
Shai-Hulud is an npm supply chain worm targeting CI/CD environments.
It installs runners on compromised systems to maintain access after credential theft, leveraging their access to secrets and internal networks.
29.11.2025
WerFaultSecure Loading DbgCore or DbgHelp - EDR-Freeze
Detects WerFaultSecure.exe loading dbgcore.dll or dbghelp.dll which contains the MiniDumpWriteDump function.
The MiniDumpWriteDump function creates a minidump of a process by suspending all threads in the target process to ensure a consistent memory snapshot.
The EDR-Freeze technique abuses WerFaultSecure.exe running as a Protected Process Light (PPL) with WinTCB protection level to suspend EDR/AV processes.
By leveraging MiniDumpWriteDump's thread suspension behavior, edr-freeze allows malicious activity to execute undetected during the suspension period.
27.11.2025
Suspicious Loading of Dbgcore/Dbghelp DLLs from Uncommon Location
Detects loading of dbgcore.dll or dbghelp.dll from uncommon locations such as user directories.
These DLLs contain the MiniDumpWriteDump function, which can be abused for credential dumping purposes or in some cases for evading EDR/AV detection by suspending processes.
27.11.2025
AWS GuardDuty Detector Deleted Or Updated
Detects successful deletion or disabling of an AWS GuardDuty detector, possibly by an attacker trying to avoid detection of its malicious activities.
Upon deletion, GuardDuty stops monitoring the environment and all existing findings are lost.
Verify with the user identity that this activity is legitimate.
27.11.2025
Suspicious Process Access to LSASS with Dbgcore/Dbghelp DLLs
Detects suspicious process access to LSASS.exe from processes located in uncommon locations with dbgcore.dll or dbghelp.dll in the call trace.
These DLLs contain functions like MiniDumpWriteDump that can be abused for credential dumping purposes. While modern tools like Mimikatz have moved to using ntdll.dll,
dbgcore.dll and dbghelp.dll are still used by basic credential dumping utilities and legacy tools for LSASS memory access and process suspension techniques.
27.11.2025
Renamed Schtasks Execution
Detects the execution of renamed schtasks.exe binary, which is a legitimate Windows utility used for scheduling tasks.
One of the very common persistence techniques is schedule malicious tasks using schtasks.exe.
Since, it is heavily abused, it is also heavily monitored by security products. To evade detection, threat actors may rename the schtasks.exe binary to schedule their malicious tasks.
27.11.2025
Suspicious Process Access of MsMpEng by WerFaultSecure - EDR-Freeze
Detects process access events where WerFaultSecure accesses MsMpEng.exe with dbgcore.dll or dbghelp.dll in the call trace, indicating potential EDR freeze techniques.
This technique leverages WerFaultSecure.exe running as a Protected Process Light (PPL) with WinTCB protection level to call MiniDumpWriteDump and suspend EDR/AV processes, allowing malicious activity to execute undetected during the suspension period.
27.11.2025
Grixba Malware Reconnaissance Activity
Detects execution of the Grixba reconnaissance tool based on suspicious command-line parameter combinations.
This tool is used by the Play ransomware group for network enumeration, data gathering, and event log clearing.
26.11.2025
Suspicious FileFix Execution Pattern
Detects suspicious FileFix execution patterns where users are tricked into running malicious commands through browser file upload dialog manipulation.
This attack typically begins when users visit malicious websites impersonating legitimate services or news platforms,
which may display fake CAPTCHA challenges or direct instructions to open file explorer and paste clipboard content.
The clipboard content usually contains commands that download and execute malware, such as information stealing tools.
24.11.2025
HackTool - WSASS Execution
Detects execution of WSASS, a tool used to dump LSASS memory on Windows systems by leveraging WER's
(Windows Error Reporting) WerFaultSecure.EXE to bypass PPL (Protected Process Light) protections.
23.11.2025
Atomic MacOS Stealer - Persistence Indicators
Detects creation of persistence artifacts placed by Atomic MacOS Stealer in macOS systems. Recent Atomic MacOS Stealer variants have been observed dropping these to maintain persistent access after compromise.
22.11.2025
Atomic MacOS Stealer - FileGrabber Activity
Detects suspicious activity associated with Atomic MacOS Stealer (Amos) campaigns, including execution of FileGrabber and curl-based POST requests used for data exfiltration. The rule identifies either the execution of FileGrabber targeting /tmp or the use of curl to POST sensitive user data (including files such as /tmp/out.zip) to remote servers, which are key indicators of Amos infostealer activity.
22.11.2025
Unsigned .node File Loaded
Detects the loading of unsigned .node files.
Adversaries may abuse a lack of .node integrity checking to execute arbitrary code inside of trusted applications such as Slack.
.node files are native add-ons for Electron-based applications, which are commonly used for desktop applications like Slack, Discord, and Visual Studio Code.
This technique has been observed in the DripLoader malware, which uses unsigned .node files to load malicious native code into Electron applications.
22.11.2025
Windows Default Domain GPO Modification via GPME
Detects the use of the Group Policy Management Editor (GPME) to modify Default Domain or Default Domain Controllers Group Policy Objects (GPOs).
Adversaries may leverage GPME to make stealthy changes in these default GPOs to deploy malicious GPOs configurations across the domain without raising suspicion.
22.11.2025
Windows Default Domain GPO Modification
Detects modifications to Default Domain or Default Domain Controllers Group Policy Objects (GPOs).
Adversaries may modify these default GPOs to deploy malicious configurations across the domain.
22.11.2025
Suspicious Filename with Embedded Base64 Commands
Detects files with specially crafted filenames that embed Base64-encoded bash payloads designed to execute when processed by shell scripts.
These filenames exploit shell interpretation quirks to trigger hidden commands, a technique observed in VShell malware campaigns.
22.11.2025
Suspicious Child Process Spawned by Node.js
Detects suspicious child processes spawned by Node.js that could indicate compromised npm packages or malicious scripts.
Malicious packages often use install/preinstall scripts to execute unauthorized system commands through these child processes.
Investigate immediately as this may indicate package compromise or malicious code execution.
21.11.2025
Suspicious DNS Exfiltration via Command Line
Detects potential data exfiltration using DNS lookups with encoded data, typically used by malicious scripts.
This technique may involve encoding data (e.g., using xxd) and sending it via DNS queries (e.g., using nslookup).
21.11.2025
Cisco ASA Exploitation Activity - Proxy
Detects suspicious requests to Cisco ASA WebVpn via proxy logs associated with CVE-2025-20333 and CVE-2025-20362 exploitation.
20.11.2025
Suspicious ClickFix/FileFix Execution Pattern
Detects suspicious execution patterns where users are tricked into running malicious commands via clipboard manipulation, either through the Windows Run dialog (ClickFix) or File Explorer address bar (FileFix).
Attackers leverage social engineering campaigns—such as fake CAPTCHA challenges or urgent alerts—encouraging victims to paste clipboard contents, often executing mshta.exe, powershell.exe, or similar commands to infect systems.
19.11.2025
DNS Query by Finger Utility
Detects DNS queries made by the finger utility, which can be abused by threat actors to retrieve remote commands for execution on Windows devices.
In one ClickFix malware campaign, adversaries leveraged the finger protocol to fetch commands from a remote server.
Since the finger utility is not commonly used in modern Windows environments, its presence already raises suspicion.
Investigating such DNS queries can also help identify potential malicious infrastructure used by threat actors for command and control (C2) communication.
19.11.2025
Network Connection Initiated via Finger.EXE
Detects network connections via finger.exe, which can be abused by threat actors to retrieve remote commands for execution on Windows devices.
In one ClickFix malware campaign, adversaries leveraged the finger protocol to fetch commands from a remote server.
Since the finger utility is not commonly used in modern Windows environments, its presence already raises suspicion.
Investigating such network connections can also help identify potential malicious infrastructure used by threat actors
19.11.2025
Suspicious Kerberos Ticket Request via CLI
Detects suspicious Kerberos ticket requests via command line using System.IdentityModel.Tokens.KerberosRequestorSecurityToken class.
Threat actors may use command line interfaces to request Kerberos tickets for service accounts in order to
perform offline password cracking attacks commonly known as Kerberoasting or other Kerberos ticket abuse
techniques like silver ticket attacks.
18.11.2025
RDP Enable or Disable via Win32_TerminalServiceSetting WMI Class
Detects enabling or disabling of Remote Desktop Protocol (RDP) using alternate methods such as WMIC or PowerShell.
In PowerShell one-liner commands, the "SetAllowTSConnections" method of the "Win32_TerminalServiceSetting" class may be used to enable or disable RDP.
In WMIC, the "rdtoggle" alias or "Win32_TerminalServiceSetting" class may be used for the same purpose.
15.11.2025
Uncommon Svchost Command Line Parameter
Detects instances of svchost.exe running with an unusual or uncommon command line parameter by excluding known legitimate or common patterns.
This could point at a file masquerading as svchost, a process injection, or hollowing of a legitimate svchost instance.
14.11.2025
Suspicious Usage of For Loop with Recursive Directory Search in CMD
Detects suspicious usage of the cmd.exe 'for /f' loop combined with the 'tokens=' parameter and a recursive directory listing.
This pattern may indicate an attempt to discover and execute system binaries dynamically, for example powershell, a technique sometimes used by attackers to evade detection.
This behavior has been observed in various malicious lnk files.
12.11.2025
Deletion of RDP Log Files via Command Line
Detects deletion of Remote Desktop Protocol (RDP) log files which may indicate ransomware or malicious activity attempting to impede forensic investigation
06.11.2025
YARA/SIGMA Rule Count
Rule Type
Community Feed
Nextron Private Feed
Yara
2711
20773
Sigma
3517
826
Sigma Rules Per Category (Community)
Type
Count
windows / process_creation
1321
windows / registry_set
214
windows / file_event
203
windows / ps_script
165
windows / security
160
linux / process_creation
129
windows / image_load
114
webserver
82
windows / system
74
macos / process_creation
68
aws / cloudtrail
55
proxy
54
windows / network_connection
53
linux / auditd
53
azure / activitylogs
42
windows / registry_event
40
azure / auditlogs
38
windows / ps_module
33
windows / application
31
windows / dns_query
26
windows / process_access
25
azure / signinlogs
24
okta / okta
22
azure / riskdetection
19
windows / pipe_created
18
opencanary / application
18
rpc_firewall / application
17
windows / windefend
16
github / audit
16
linux
16
gcp / gcp.audit
16
bitbucket / audit
14
m365 / threat_management
13
linux / file_event
13
windows / file_delete
13
cisco / aaa
12
windows / create_remote_thread
12
windows / driver_load
10
kubernetes / application / audit
10
windows / codeintegrity-operational
10
windows / ps_classic_start
9
dns
9
windows / create_stream_hash
9
windows / registry_delete
9
windows / firewall-as
8
windows / msexchange-management
8
antivirus
7
fortigate / event
7
windows / appxdeployment-server
7
windows / file_access
7
azure / pim
7
windows / bits-client
7
gcp / google_workspace.admin
7
zeek / smb_files
7
windows / dns-client
6
jvm / application
5
kubernetes / audit
5
zeek / dns
5
linux / network_connection
5
zeek / http
5
windows / sysmon
4
windows / taskscheduler
4
windows / iis-configuration
4
zeek / dce_rpc
4
macos / file_event
3
windows / wmi_event
3
windows / powershell-classic
3
windows / ntlm
3
windows / registry_add
3
linux / sshd
3
m365 / audit
3
windows / dns-server
2
spring / application
2
apache
2
onelogin / onelogin.events
2
firewall
2
linux / syslog
2
windows / file_change
2
windows / security-mitigations
2
windows / sysmon_status
1
m365 / exchange
1
zeek / rdp
1
windows / file_rename
1
ruby_on_rails / application
1
m365 / threat_detection
1
zeek / kerberos
1
windows / terminalservices-localsessionmanager
1
windows / sysmon_error
1
windows / driver-framework
1
sql / application
1
windows
1
linux / sudo
1
velocity / application
1
cisco / duo
1
cisco / ldp
1
nginx
1
windows / dns-server-analytic
1
cisco / bgp
1
windows / ldap
1
windows / wmi
1
windows / ps_classic_provider_start
1
windows / printservice-admin
1
windows / printservice-operational
1
database
1
linux / clamav
1
windows / lsa-server
1
linux / auth
1
linux / guacamole
1
windows / applocker
1
django / application
1
fortios / sslvpnd
1
huawei / bgp
1
windows / appmodel-runtime
1
windows / openssh
1
cisco / syslog
1
linux / cron
1
juniper / bgp
1
windows / appxpackaging-om
1
windows / process_tampering
1
windows / smbclient-connectivity
1
windows / smbserver-connectivity
1
windows / raw_access_thread
1
paloalto / file_event / globalprotect
1
windows / capi2
1
windows / microsoft-servicebus-client
1
nodejs / application
1
paloalto / appliance / globalprotect
1
linux / vsftpd
1
zeek / x509
1
windows / certificateservicesclient-lifecycle-system
1
windows / shell-core
1
windows / file_executable_detected
1
python / application
1
windows / diagnosis-scripted
1
windows / smbclient-security
1
Sigma Rules Per Category (Nextron Private Feed)
Type
Count
windows / process_creation
391
windows / registry_set
78
windows / ps_script
76
windows / image_load
43
windows / file_event
38
linux / process_creation
36
windows / wmi
29
windows / security
22
proxy
12
windows / system
9
windows / network_connection
8
windows / registry_event
8
windows / kernel-event-tracing
6
windows / ntfs
5
windows / ps_module
5
windows / sense
4
windows / pipe_created
4
windows / taskscheduler
4
windows / create_remote_thread
4
windows / registry_delete
4
windows / ps_classic_script
3
webserver
3
windows / vhd
3
windows / application-experience
3
windows / driver_load
3
windows / hyper-v-worker
3
windows / windefend
2
windows / kernel-shimengine
2
windows / process_access
2
windows / bits-client
2
windows / codeintegrity-operational
2
windows / file_delete
1
windows / registry-setinformation
1
windows / firewall-as
1
linux / file_event
1
windows / file_rename
1
macos / process_creation
1
windows / audit-cve
1
windows / amsi
1
windows / application
1
windows / process-creation
1
windows / dns_query
1
windows / file_access
1
Tenable Nessus
Requirement: Privileged Scan
- YARA Scanning with Nessus works only when scanning with credentials (privileged scan)
YARA Scanning with Nessus
- You can only upload a single .yar file
- Filesystem scan has to be activated
- You have to define the target locations
- The Nessus plugin ID will be 91990
- Only files with the following extensions can be scanned: .application, .asp, .aspx, .bat, .chm, .class, .cmd, .com, .cp, .csh, .dl, .doc, .docx, .drv, .exe, .gadget, .hta, .inf, .ins, .inx, .isu, .jar, .job, .jpeg, .jpg, .js, .jse, .jse, .jsp, .lnk, .msc, .msi, .msp, .mst, .paf, .pdf, .php, .pif, .ppt, .pptx, .ps1, .ps1xm, .ps2, .ps2xm, .psc1, .psc2, .reg, .rgs, .scf, .scr, .sct, .shb, .shs, .swf, .sys, .u3p, .vb, .vbe, .vbs, .vbscript, .ws, .wsf, .xls, .xls
Carbon Black
Tutorial: https://github.com/carbonblack/cb-yara-connectorFireEye EX
Tutorial: https://www.fireeye.com/blog/products-and-services/2018/12/detect-and-block-email-threats-with-custom-yara-rules.html
Scan your endpoints, forensic images or collected files with our portable scanner THOR