currently serving 23442 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_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
MAL_Tomiris_PS1_Executor_Dec25
Detects a simple packer written in C++. It extracts a Base64-encoded PowerShell script from itself and executes it, seen being used by Tomiris threat actor
26.12.2025
MAL_Tomiris_PS1_Telegram_Backdoor_Dec25
Detects a backdoor written in PowerShell that uses Telegram to communicate with the C2 server, seen being used by Tomiris threat actor
26.12.2025
MAL_DLL_Loader_Dec25
Detects a DLL loader that decrypts and loads payload, seen being used by Silver fox APT group
25.12.2025
MAL_OBFUSC_Shell_Dropper_Dec25
Detects obfuscated shell script that drops and executes a payload on macOS, seen being used by MacSync stealer
24.12.2025
SUSP_Shell_Downloader_Dec25
Detects a shell that fetches and executes AppleScript and exfiltrates stolen data to C2 gate endpoint, seen being used by MacSync stealer
24.12.2025
MAL_MacOS_Downloader_Dec25
Detects a macOS downloader that fetches and executes a remote payload, seen being used by MacSync stealer
24.12.2025
MAL_Nosy_Downloader_Dec25
Detects Nosy downloader, seen being used by LongNosedGoblin APT group
24.12.2025
MAL_Browser_Stealer_Dec25_2
Detects a loader that loads a browser stealer part of GlassWorm Campaign
23.12.2025
MAL_Browser_Stealer_Dec25_1
Detects browser stealer part of GlassWorm Campaign
23.12.2025
MAL_String_Encryption_Dec25
Detects string encryption function seen being used by multiple malwares
23.12.2025
MAL_NosyStealer_Stage2_Dec25
Detects second stage of NosyStealer stealer, seen being used by LongNosedGoblin APT group
23.12.2025
MAL_GhostPenguin_Dec25
Detects GhostPenguin a multi-threaded Linux backdoor written in C++ that provides remote shell access and comprehensive file system operations over an RC5-encrypted UDP channel.
22.12.2025
HKTL_NosyHistorian_Dec25
Detects NosyHistorian browser-history collection tool deployed via Group Policy, seen being used by LongNosedGoblin APT group
22.12.2025
MAL_JS_AI_Exfiltration_Dec25
Detects JavaScript within malicious browser extensions exfiltrating AI chats
17.12.2025
SUSP_JS_XMLHttpRequest_Overwrite_Dec25
Detects suspicious overwrites of XMLHttpRequest JavaScript functions
17.12.2025
SUSP_JS_WebSocket_Overwrite_Dec25
Detects suspicious overwrites of WebSocket JavaScript class
17.12.2025
SUSP_OBFUSC_JS_Loader_Dec25
Detects obfuscated JavaScript loader used to drop additional payload
16.12.2025
MAL_SVG_Obfuscated_JS_Loader_Dec25
Detects suspicious SVG file with obfuscated JavaScript payload using Base64 and CharCode decoding
16.12.2025
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
MAL_BAT_OBFUSC_BOM_Override_Apr25
2
217c7e2a48403fafac8a52e3b682e0d30352ac79d6b82eb1e0205572fbbec397
SUSP_PS1_Cmdlet_Defender_Exclusion_Apr21_1
2
217c7e2a48403fafac8a52e3b682e0d30352ac79d6b82eb1e0205572fbbec397
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
4
58f4600c2881fd8119c9c39da1c1ff89b1927735cddbe735fbc1fc866b3a66a2
SUSP_Protector_Themida_Packed_Samples_Mar21_1
1
709d5b34f5a728aa7740cadb3a87096e084f41b047466c0be0ed668c26999f69
SUSP_MSIL_NET_OBF_ConfuserEx_Constants_Jul23
4
8894e432d180dcfadd03638a10e121ccaf0e59a6c07032960e4d24efde90aa69
SUSP_PY_Stealer_Characteristics_Sep24
4
510bc096e6db06c8cba143d852354117c9a20f62d9d05b714da44cfbbbd2d6ac
SUSP_Small_Loader_Characteristics_Apr21_1
2
37d3618e772ea1ec55308a7ff54816254b295988b8cfc839d952fc0d34889ea3
SUSP_PY_Stealer_Characteristics_Sep24
4
70fa988b6f698554923b44bc348cffac3d5063d9e68bee98a73341a95bc32055
SUSP_LNX_ReverseShell_Indicator_Jun22
1
ff7ac755f7a0aee4d88cfe32c977e8d0f54512ea421540bcda8290b9556067d0
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
7340
Threat Hunting (not subscribable, only in THOR scanner)
5726
APT
5041
Hacktools
4797
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
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
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
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 - 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
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
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 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
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
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
2712
20730
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
linux / auditd
53
windows / network_connection
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
opencanary / application
18
windows / pipe_created
18
rpc_firewall / application
17
github / audit
16
linux
16
gcp / gcp.audit
16
windows / windefend
16
bitbucket / audit
14
linux / file_event
13
windows / file_delete
13
m365 / threat_management
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
windows / bits-client
7
azure / pim
7
zeek / smb_files
7
gcp / google_workspace.admin
7
windows / dns-client
6
jvm / application
5
kubernetes / audit
5
zeek / dns
5
linux / network_connection
5
zeek / http
5
windows / iis-configuration
4
zeek / dce_rpc
4
windows / taskscheduler
4
windows / sysmon
4
windows / wmi_event
3
windows / powershell-classic
3
windows / ntlm
3
linux / sshd
3
windows / registry_add
3
m365 / audit
3
macos / file_event
3
onelogin / onelogin.events
2
firewall
2
windows / security-mitigations
2
windows / file_change
2
linux / syslog
2
apache
2
windows / dns-server
2
spring / application
2
cisco / duo
1
windows / terminalservices-localsessionmanager
1
sql / application
1
cisco / bgp
1
nginx
1
windows
1
linux / sudo
1
velocity / application
1
cisco / ldp
1
windows / ldap
1
windows / wmi
1
windows / dns-server-analytic
1
windows / lsa-server
1
windows / ps_classic_provider_start
1
windows / printservice-admin
1
linux / clamav
1
windows / applocker
1
windows / printservice-operational
1
database
1
linux / guacamole
1
windows / appmodel-runtime
1
linux / auth
1
linux / cron
1
juniper / bgp
1
windows / openssh
1
django / application
1
fortios / sslvpnd
1
huawei / bgp
1
windows / appxpackaging-om
1
cisco / syslog
1
zeek / x509
1
windows / smbserver-connectivity
1
windows / process_tampering
1
windows / smbclient-connectivity
1
linux / vsftpd
1
windows / capi2
1
windows / raw_access_thread
1
paloalto / file_event / globalprotect
1
windows / certificateservicesclient-lifecycle-system
1
windows / microsoft-servicebus-client
1
nodejs / application
1
paloalto / appliance / globalprotect
1
windows / shell-core
1
windows / diagnosis-scripted
1
windows / file_executable_detected
1
python / application
1
m365 / exchange
1
zeek / rdp
1
windows / smbclient-security
1
windows / file_rename
1
windows / sysmon_status
1
m365 / threat_detection
1
windows / sysmon_error
1
zeek / kerberos
1
windows / driver-framework
1
ruby_on_rails / application
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 / pipe_created
4
windows / sense
4
windows / create_remote_thread
4
windows / registry_delete
4
windows / taskscheduler
4
windows / ps_classic_script
3
windows / vhd
3
webserver
3
windows / application-experience
3
windows / driver_load
3
windows / hyper-v-worker
3
windows / kernel-shimengine
2
windows / process_access
2
windows / windefend
2
windows / bits-client
2
windows / codeintegrity-operational
2
windows / firewall-as
1
macos / process_creation
1
windows / file_rename
1
windows / application
1
windows / process-creation
1
windows / amsi
1
windows / file_access
1
windows / file_delete
1
windows / audit-cve
1
windows / registry-setinformation
1
windows / dns_query
1
linux / file_event
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
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