currently serving 24630 YARA rules and 4722 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
WEBSHELL_CSS_PassThrough_Sep26
Detects suspicious CSS files that contain pass-through and cookie decoding functionality, which is often used in webshells
28.09.2026
EXPL_CVE_2026_88772_POC_Sep26
Detects POC for Citrix NetScaler DTLS memory overflow, CVE-2026-88772
28.09.2026
LOG_SUSP_EXPL_CVE_2026_88771_Sep26
Detects potential exploitation indicator for Citrix NetScaler PreAuth Command Injection CVE-2026-88771
28.09.2026
MAL_Backdoor_Loader_Sep26
Detects a loader used to load 2nd stage payloads, also seen being used to load SparroWocky backdoor
25.09.2026
MAL_APT_SparroWock_Backdoor_Sep26
Detects SparroWocky backdoor, a backdoor that uses named pipes for C2 communication and can execute commands on the infected system, seen being used by FamousSparrow APT
25.09.2026
SUSP_FNV_1A_Hashing_Sep26
Detects FNV-1a hashing patterns, often used for dynamic function resolution, commonly seen in shellcodes and packers
25.09.2026
APT_MAL_Famous_Chollima_Branchlure_Git_Hook_Downloader_Sep26
Detects a Git hook downloader's platform-specific delivery endpoint, seen being used by Famous Chollima APT
22.09.2026
APT_MAL_Famous_Chollima_Branchlure_BAT_Launcher_Sep26
Detects Windows batch launcher that stages the next-stage script and runs it, seen being used by Famous Chollima APT
22.09.2026
APT_MAL_Famous_Chollima_Branchlure_Keylogger_Sep26
Detects a keylogger through compiled CIL instruction sequences, seen being used by Famous Chollima APT
22.09.2026
APT_MAL_Famous_Chollima_Branchlure_Node_Spawn_Loader_Sep26
Detects Node loader that spawns a per-platform download piped into an interpreter, seen being used by Famous Chollima APT
22.09.2026
APT_MAL_RAT_Sep26
Detects a RAT that establishes persistence, communicates with C2 infrastructure, collects system information, and supports remote file download and execution, seen being used by Transparent tribe APT group
22.09.2026
SUSP_Shell_Loader_Sep26
Detects a loader script that decodes Base64 encoded content and executes the resulting payload via eval
21.09.2026
SUSP_Shell_Downloader_Sep26
Detects a shell downloader script that uses printf-based string reconstruction, gathers the username, and downloads a payload
21.09.2026
MAL_DLL_Backdoor_Sep26
Detects a DLL backdoor that establishes persistence key, implements anti analysis checks, and communicates with a C2, likely targeting of an Afghanistan government agency
21.09.2026
SUSP_Screen_Capture_Indicators_Sep26
Detects scripts or binaries containing code indicative of screen capture. It doesn't automatically mean the script or binary is malicious, so further analysis is required
16.09.2026
MAL_ShadowHVNC_Family_Sep26
Detects ShadowHVNC and derived variants of it. ShadowHVNC is a stealthy remote access trojan that provides hidden VNC access to compromised systems.
09.09.2026
MAL_MacOS_Downloader_Sep26
Detects a downloader used to retrieve and execute staged payloads from a C2 server.
09.09.2026
MAL_Backdoor_Sep26
Detects a small backdoor capable of command execution, payload writing, and singleton execution checks
09.09.2026
SUSP_UEFI_Embedded_EXE_Sep26
Detects UEFI binaries that has Embedded Windows executables, which may indicate a potential injection of Windows code from the UEFI environment
09.09.2026
SUSP_UEFI_Characteristics_Sep26
Detects UEFI binaries suspicious characteristics such as Windows functions, disabling SMEP and WP, or containing a PE loader, which may indicate attempts to load or inject Windows code from the UEFI environment and bypass security mechanisms. Further analysis is advised
09.09.2026
HKTL_MSNightmare_ShieldCrash_Sep26
Detects ShieldCrash a new iteration of the Microsoft Defender exploit ShieldBreak. The hacktool is used to bypass Windows Defender and execute arbitrary code on the system.
09.09.2026
SUSP_PS1_ScriptBlock_EnvVar_Payload_Staging_Sep26
Detects PowerShell scripts that load and execute a payload stored in a process-scoped environment variable via ScriptBlock. The actual malicious code is never written to disk or visible in the command line arguments.
08.09.2026
MAL_Batch_Script_Downloader_Sep26
Detects a Batch Script used to download and execute OtterCookie RAT and other payloads
08.09.2026
MAL_JS_RAT_Sep26
Detects a RAT written in JavaScript capable of stealing sensitive information and executing commands
08.09.2026
MAL_UEFI_XigMapper_Bootkit_Sep26
Detects Xigmapper UEFI bootkit that installs hooks into ntoskrnl.exe to load malicious kernel modules
08.09.2026
MAL_Bash_Downloader_Sep26
Detects a downloader written in bash used to download and execute malicious payloads on macOS systems
07.09.2026
MAL_MacOS_Bash_Downloader_Sep26_2
Detects a Bash script used to download and execute OtterCookie RAT
07.09.2026
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
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
8
e07662009256d508f52b21da20efa3cc12dad00745930426e781e715efd50869
SUSP_Base64_Encoded_Hex_Encoded_Code
8
18e1824c351dc0dc64d0d535abc352e69e148040c2d0d82064dda35aab4b22be
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
8
18e1824c351dc0dc64d0d535abc352e69e148040c2d0d82064dda35aab4b22be
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
8
836437d70c7ba5d3db3b23ff0883c84d045573eedd869e2102515d8a848923b1
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
8
2c9a95497bd8eba44f9a493188e86bd14853e62e352f1286898f308d8ae1a8da
SUSP_Base64_Encoded_Hex_Encoded_Code
8
2c9a95497bd8eba44f9a493188e86bd14853e62e352f1286898f308d8ae1a8da
SUSP_Base64_Encoded_Hex_Encoded_Code
8
836437d70c7ba5d3db3b23ff0883c84d045573eedd869e2102515d8a848923b1
SUSP_Base64_Encoded_Hex_Encoded_Code
8
1fb674353c6258d98c8dfce3a5e8cf25e43dfce83f3335b45ff595acc129226d
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
8
1fb674353c6258d98c8dfce3a5e8cf25e43dfce83f3335b45ff595acc129226d
SUSP_Base64_Encoded_ELF_Binary_Feb19
1
d4d2fb2cb53cd61240c2e22f6e11eaffd9cdecda016ab2fb5fc530fe84f67ca8
SUSP_PS1_OBFUSC_FormatString_Sep22_2
13
ec9e1bf0bc8ec46650c7d5c111b78006154ec15ffc64fa90faf043275eb97441
SUSP_PS1_Invoke_Expression_May22_1
13
ec9e1bf0bc8ec46650c7d5c111b78006154ec15ffc64fa90faf043275eb97441
SUSP_Browsers_Data_Exfiltration_Sep25
6
0b1d519ac75116be36307162ad5a3683e9af430bcfaa3ae80ae5f05fd9da8eb2
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
7900
Threat Hunting (not subscribable, only in THOR scanner)
6074
APT
5104
Hacktools
4915
Webshells
2406
Exploits
751
Newest Sigma Rules
This table shows the newest additions to the Sigma rule set
Rule
Description
Date
Ref
Info
Potential PowerShell Keylogger via Low-Level Keyboard Hook
Detects PowerShell ScriptBlock containing inline C# that installs a low-level keyboard hook
via SetWindowsHookEx with the WH_KEYBOARD_LL hook type. Attackers use Add-Type to compile
and execute a keylogger entirely in memory, intercepting all keystrokes system-wide without
dropping a standalone binary to disk. The presence of CallNextHookEx confirms a chained hook
implementation, distinguishing it from benign API references.
16.09.2026
Potential PowerShell Screen Capture via Win32 GDI BitBlt
Detects PowerShell ScriptBlock using the Win32 GDI BitBlt API to capture screen content.
Attackers use this native approach to silently copy display pixel data without dropping a
standalone capture binary, a technique commonly observed in keyloggers, RATs and spyware.
16.09.2026
PowerShell Script Execution From Environment Variable - ScriptBlock
Detects PowerShell loading and executing a script stored inside an environment variable.
Attackers use this to hide the malicious code from command-line logs and security tools,
since the actual script is never written to disk or shown in the process arguments.
08.09.2026
PowerShell Script Execution From Environment Variable - CommandLine
Detects PowerShell loading and executing a script stored inside an environment variable.
Attackers use this to hide the malicious code from command-line logs and security tools,
since the actual script is never written to disk or shown in the process arguments.
08.09.2026
Kernel Driver Service ImagePath Set by Potentially Suspicious Process
Detects kernel driver service ImagePath registry values being set by potentially suspicious processes.
This can indicate attempts to load kernel drivers without using the standard Service Control Manager,
which malware may use to maintain persistence or employ BYOVD techniques often used in EDR killer tools.
It's recommended to first baseline this rule in your environment and adjust it accordingly before enabling
it in production.
02.09.2026
Kernel Driver Service ImagePath Pointing to Non-Standard Location
Detects kernel driver service ImagePath registry values that point to non-standard locations outside typical Windows driver directories.
This may indicate attempts to load malicious or vulnerable kernel drivers for persistence or privilege escalation, a technique commonly
observed in EDR-killer tools that drop a driver to a non-standard location before loading it for further exploitation. It's recommended
to first baseline this rule in your environment and adjust it accordingly before enabling it in production.
02.09.2026
PUA - Tailcat Saved Key Generation - Linux
Detects the generation of Tailcat saved keys that persist the secret between multiple sessions. Using Tailcat persistently is unusual in corporate environments.
02.09.2026
PUA - Tailcat Saved Key Generation - Windows
Detects the generation of Tailcat saved keys that persist the secret between multiple sessions. Using Tailcat persistently is unusual in corporate environments.
02.09.2026
Remote PDF Opened via Explorer with HTTP URL
Detects explorer.exe being invoked with an HTTP URL pointing to a remote PDF file.
Attackers use this technique to display a decoy document while a malicious payload
executes in the background, distracting the victim after LNK-based initial access.
explorer.exe is not normally launched from the command line with a remote HTTP path;
its appearance in such a context is a strong indicator of a scripted attack chain.
31.08.2026
EventLog Metadata Inspection Via Wevtutil
Detects the eventlog metadata inspection attempt via wevtutil.exe.
Threat actors use these to verify whether security logging is active and gauge
how much time they have before entries are overwritten, before performing intrusive actions.
27.08.2026
Email Protocol Access Via Curl
Detects curl.exe being used to access email servers over IMAP or SMTP protocols.
Curl natively supports IMAP/IMAPS and SMTP/SMTPS, allowing attackers to interact with
mailboxes directly from the command line - reading inbox contents, selecting folders,
or sending messages - without deploying a dedicated mail client. This technique is used
for C2 communication via corporate mail infrastructure and for data exfiltration, blending
with legitimate email traffic.
27.08.2026
Renamed Node.js Binary Execution
Detects the execution of a renamed Node.js JavaScript runtime, normally named "node.exe".
Node.exe is the executable file for the Node.js JavaScript runtime and is typically used
to execute JavaScript code outside a web browser environment. Threat actors may
rename the Node.js executable to a random name to run malicious scripts stealthily.
26.08.2026
Senstitive File Access via Cmd Utility
Detects the usage of windows inbuilt cmd.exe utility to access sensitive files such as configuration files,
certificate files, and password files. It might indicate an adversary attempting to access sensitive files
for credential access or collection purposes via reverse shell or cli interaction.
26.08.2026
SSH Known Hosts File Deleted
Detects deletion of SSH known_hosts files via file deletion events.
Complements the proc_creation variant by catching cases where the shell handles
the operation directly (e.g. bare redirects, unlink syscalls) without spawning
a traceable child process.
Attackers remove known_hosts to erase lateral movement destinations and suppress
SSH host key mismatch warnings.
19.08.2026
Linux Log File Content Cleared or Deleted via CLI Utilities
Detects unusual CLI-based methods to clear or delete Linux log file contents, including
truncating to zero size, overwriting with /dev/null, and other methods. These techniques
are commonly used by attackers and ransomware to destroy forensic evidence before or after
malicious activity.
19.08.2026
Logging Daemon Force Killed via CommandLine
Detects use of kill, killall, pkill, or other command line methods to forcefully terminate
common Linux logging and auditing services. Threat actors or malware may use this technique
to silence audit trails before encryption or exfiltration.
19.08.2026
Logging Service Stopped via Service Command
Detects use of the legacy service command to stop common Linux logging and auditing services. The service
command wraps SysV init scripts and remains functional on systemd-based distributions via compatibility shims.
Attackers use this to stop logging with a command that blends into older administration patterns.
19.08.2026
SSH Known Hosts File Removed or Cleared
Detects removal or clearing of SSH known_hosts files via common CLI utilities.
Attackers delete known_hosts to erase evidence of lateral movement destinations and to
suppress SSH host key mismatch warnings when reconnecting to a host whose key has been changed.
19.08.2026
Logging Service Stopped or Disabled via Systemctl
Detects use of systemctl to stop, kill, mask, or disable common Linux logging and auditing services (rsyslog, syslog-ng, auditd, systemd-journald).
Attackers and ransomware use this to silence audit trails before encryption or exfiltration.
Masking a service additionally prevents it from being restarted by other processes.
19.08.2026
PowerShell AppLocker Policy Discovery Via Get-AppLockerPolicy
Detects AppLocker policy enumeration attempts via PowerShell using the Get-AppLockerPolicy cmdlet and an policy scope of either Effective, LDAP, or Local.
19.08.2026
New User Account Creation Attempt Via ADSI
Detects an attempt to create a new user account via ADSI (Active Directory Service Interfaces)
using either the WinNT or LDAP provider. This is an uncommon method to create user accounts
and may indicate an attempt to evade detection by avoiding more commonly monitored commands
such as "net user", "New-LocalUser" or "New-ADUser".
13.08.2026
New User Account Creation Attempt Via ADSI in CommandLine
Detects PowerShell command line arguments containing ADSI (Active Directory Service Interfaces) patterns
trying to create a new user account via the WinNT or LDAP provider. This is an uncommon method to create
user accounts and may indicate an attempt to evade detection by avoiding more commonly monitored commands
such as "net user", "New-LocalUser" or "New-ADUser".
13.08.2026
PowerShell Live Kernel Dump
Detects PowerShell scripts or commands that create live kernel dumps.
While live kernel dumps are a legitimate diagnostic mechanism, they are increasingly
abused by threat actors to read sensitive process memory such as LSASS without opening
a direct process handle, bypassing traditional process-access based detections.
10.08.2026
Live Kernel Dump via CommandLine
Detects live kernel dumps initiated via the command line.
While kernel dumps are not inherently malicious, these dumps can be accessed
to read sensitive process memory such as LSASS without opening a direct process
handle, bypassing traditional process-access based detections.
10.08.2026
Potential Crontab Persistence via CLI
Detects command lines attempting to install a crontab persistence via cli by echoing a cron schedule and piping it to 'crontab -' via stdin.
Attackers may use this technique to establish persistence on a compromised system by scheduling malicious tasks to run at regular intervals.
07.08.2026
Container Overlay Filesystem Enumeration via Mount - Linux
Detects processes enumerating overlay filesystems by piping mount output through grep for "overlay".
This technique is used by attackers to detect if they are running inside a container (e.g., Docker, Podman),
which is a common precursor to container escape attempts or environment-aware malware behaviour.
07.08.2026
Sensitive File Discovery via Find Command
Detects aggressive filesystem searches for credential, certificate, and wallet files using the 'find' command.
This behavior may indicate an adversary attempting to locate sensitive files such as environment variable files, private keys, certificates, or wallet files that could be used for credential access or further compromise.
07.08.2026
Suspicious Grep of Sensitive Contents for Credential Access
Detects the use of grep to search for sensitive credentials and cryptocurrency wallet mnemonics.
This behaviour may indicate an adversary trying to to locate sensitive credentials contained in environment variable files, private keys, certificates, wallet files, or other files that may contain secrets which could be used for credential access or further compromise.
07.08.2026
PostgreSQL Connection String Enumeration via Grep
Detects the use of grep to search for PostgreSQL connection strings and database URLs, which may indicate credential harvesting from application directories as a precursor to lateral movement or data exfiltration.
Attackers may use this technique to find hardcoded database credentials in source code, configuration files, or environment variable definitions.
07.08.2026
Suspicious Node.js Child Process with IP Address - Linux
Detects a Node.js process spawning a shell or network utility with a command line containing an IPv4 address.
This pattern is commonly used by malicious npm postinstall scripts to download second-stage payloads or establish reverse shells, as observed in various malicious Strapi npm campaign.
07.08.2026
YARA/SIGMA Rule Count
Rule Type
Community Feed
Nextron Private Feed
Yara
1298
23332
Sigma
3617
1105
Sigma Rules Per Category (Community)
Type
Count
windows / process_creation
1359
windows / registry_set
219
windows / file_event
211
windows / ps_script
167
windows / security
164
linux / process_creation
142
windows / image_load
115
webserver
86
windows / system
74
macos / process_creation
69
aws / cloudtrail
57
proxy
55
linux / auditd
54
windows / network_connection
53
azure / auditlogs
44
windows / registry_event
40
azure / activitylogs
35
windows / ps_module
33
windows / application
32
windows / dns_query
28
windows / process_access
25
opencanary / application
24
okta / okta
22
windows / pipe_created
19
azure / riskdetection
19
azure / signinlogs
18
windows / windefend
17
rpc_firewall / application
17
linux
16
linux / file_event
16
gcp / gcp.audit
16
github / audit
15
bitbucket / audit
14
m365 / threat_management
13
cisco / aaa
13
windows / file_delete
13
windows / create_remote_thread
12
dns
10
windows / driver_load
10
kubernetes / application / audit
10
windows / registry_delete
10
windows / codeintegrity-operational
10
windows / ps_classic_start
9
antivirus
9
windows / create_stream_hash
9
windows / appxdeployment-server
9
windows / firewall-as
8
windows / msexchange-management
8
fortigate / event
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
kubernetes / audit
6
jvm / application
5
zeek / dns
5
linux / network_connection
5
zeek / http
5
windows / taskscheduler
4
windows / sysmon
4
macos / file_event
4
windows / iis-configuration
4
m365 / audit
4
zeek / dce_rpc
4
windows / wmi_event
3
windows / powershell-classic
3
windows / ntlm
3
windows / registry_add
3
linux / sshd
3
gcp / google_workspace.login
3
windows / dns-server
2
spring / application
2
apache
2
windows / wmi
2
onelogin / onelogin.events
2
windows / applocker
2
firewall
2
windows / security-mitigations
2
linux / syslog
2
windows / smbclient-security
1
windows / file_rename
1
windows / sysmon_status
1
ruby_on_rails / application
1
m365 / exchange
1
zeek / rdp
1
m365 / threat_detection
1
zeek / kerberos
1
windows / driver-framework
1
windows / terminalservices-localsessionmanager
1
windows / sysmon_error
1
sql / application
1
cisco / duo
1
windows
1
linux / sudo
1
velocity / application
1
cisco / ldp
1
nginx
1
windows / ldap
1
windows / dns-server-analytic
1
cisco / bgp
1
windows / lsa-server
1
windows / ps_classic_provider_start
1
windows / printservice-admin
1
database
1
windows / printservice-operational
1
linux / clamav
1
windows / appmodel-runtime
1
django / application
1
linux / auth
1
linux / guacamole
1
windows / openssh
1
fortios / sslvpnd
1
juniper / bgp
1
windows / appxpackaging-om
1
windows / process_tampering
1
cisco / syslog
1
linux / cron
1
huawei / bgp
1
windows / smbclient-connectivity
1
windows / capi2
1
windows / microsoft-servicebus-client
1
windows / file_change
1
nodejs / application
1
paloalto / file_event / globalprotect
1
zeek / x509
1
windows / certificateservicesclient-lifecycle-system
1
windows / smbserver-connectivity
1
windows / raw_access_thread
1
paloalto / appliance / globalprotect
1
windows / shell-core
1
python / application
1
linux / vsftpd
1
windows / diagnosis-scripted
1
windows / file_executable_detected
1
Sigma Rules Per Category (Nextron Private Feed)
Type
Count
windows / process_creation
544
windows / registry_set
97
windows / ps_script
95
linux / process_creation
72
windows / file_event
52
windows / image_load
48
windows / wmi
29
windows / security
29
proxy
13
windows / system
13
windows / network_connection
9
windows / registry_event
8
windows / kernel-event-tracing
6
windows / dns_query
5
windows / ntfs
5
windows / ps_module
5
windows / registry_delete
4
windows / create_remote_thread
4
windows / sense
4
windows / pipe_created
4
webserver
4
windows / taskscheduler
4
windows / application-experience
3
windows / vhd
3
windows / hyper-v-worker
3
windows / driver_load
3
macos / process_creation
3
dns
3
windows / ps_classic_script
3
windows / process_access
2
windows / windefend
2
linux / file_event
2
windows / bits-client
2
windows / file_access
2
linux / file_delete
2
windows / kernel-shimengine
2
windows / file_delete
2
windows / codeintegrity-operational
2
linux / Linux kernel module / THOR
2
windows / smbclient-security
2
windows / application
1
windows / amsi
1
windows / audit-cve
1
windows / firewall-as
1
windows / registry-setinformation
1
windows / file_rename
1
windows / environment variable / THOR
1
linux / Unix user / THOR
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