currently serving 24450 YARA rules and 4700 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
HKTL_ShieldBreak_LPE_Aug26
Detects the ShieldBreak proof-of-concept for a Windows Defender local privilege-escalation vulnerability. ShieldBreak manipulates Cloud Files placeholder hydration and Object Manager symbolic links during Defender remediation to redirect a privileged file operation and plant an attacker-controlled DLL in the Windows System32 directory, which is subsequently loaded through Windows Error Reporting.
12.08.2026
MAL_Generic_Loader_Aug26
Detects loaders used to download and execute additional payloads, potentially attributed to North Korean APT groups
10.08.2026
MAL_APT_Rootkit_Silver_Fox_Aug26
Detects a rootkit driver that terminate security processes, seen being used by Silver Fox APT
10.08.2026
MAL_APT_Silver_Fox_Downloader_Aug26
Detects a second stage downloader used in ValleyRAT campaign, seen being used by Silver Fox APT
07.08.2026
VULN_Driver_EnPortv_Aug26
Detects vulnerable driver EnPortv.sys, which can be abused to terminate security processes
07.08.2026
MAL_NET_AMSI_Bypass_Aug26
Detects .NET executables that contain code to bypass AMSI or ETW. This is a common technique used by malware to evade detection.
05.08.2026
MAL_Rootrun_Utility_Aug26
Detects Rootrun, a privilege-escalation utility used to execute commands with root privileges on compromised Linux appliances.
04.08.2026
MAL_JS_Shai_Hulud_Aug26
Detects malicious JavaScript used to steal GitHub credentials
04.08.2026
SUSP_OBFUSC_JS_Patterns_Aug26_1
Detects common obfuscation patterns in JavaScript seen being used by Lazarus Group (DPRK)
03.08.2026
SUSP_OBFUSC_JS_Patterns_Aug26_2
Detects common obfuscation patterns in JavaScript seen being used by Lazarus Group (DPRK)
03.08.2026
SUSP_PY_Credential_Stealer_Aug26
Detects credential stealer written in Python which exfiltrates SSH keys and API tokens
03.08.2026
MAL_EXP_Email_CVEs_Aug26
Detects multiple CVEs exploiting webmail vulnerabilities such as CVE-2026-8496
02.08.2026
MAL_ZimReaper_Aug26
Detects ZimReaper that steals the Cross-Site Request Forgery (CSRF) token and the auto-complete password of the logged-in user from the browser, then uses Zimbra APIs to conduct reconnaissance against the device and gather two-factor authentication codes. This material is exfiltrated alongside the victim's email address, and information about the Zimbra installation, via DNS queries to the adversary C&C.
02.08.2026
MAL_Roundcube_Credential_Stealer_Aug26
Detects Roundcube credential stealer module
02.08.2026
SUSP_Encoded_JavaScript_Execution_Aug26
Detects entity-encoded and URI/Unicode-escaped JavaScript to dynamically reconstruct and execute JavaScript
02.08.2026
MAL_CVE_2025_66376_Aug26_2
Detects CVE-2025-66376, that does not adequately sanitize items between @import calls.
01.08.2026
SUSP_CVE_2025_66376_Aug26_1
Detects CVE-2025-66376, that does not adequately sanitize items between @import calls.
01.08.2026
SUSP_Kernel_Module_SpcSpOpusInfo_Jul26
Detects a kernel module signed by Autel Intelligent Technology Corp., Ltd., which has been observed to be associated with suspicious activity.
31.07.2026
MAL_Dropper_Jul26
Detects a dropper that decodes embedded PatchAgent loader, seen being used by Muddywater
29.07.2026
MAL_PatchAgent_Loader_Jul26
Detects PatchAgent loader that validates a custom file container format (PTCH), verifies HMAC-SHA256 integrity, decrypts AES-256-CBC encrypted payloads, and executes the recovered shellcode in memory, seen being used by Muddywater
29.07.2026
MAL_Shellcode_Backdoor_Jul26
Detects shellcode backdoor that supports PowerShell execution, file download and execution, and process hollowing, seen being used by Muddywater
29.07.2026
SUSP_PTCH_Container_Format_Jul26
Detects a custom file container format (PTCH v2) which contains encrypted payloads for different operating systems, seen being used by the MuddyWater-linked PatchAgent loader
29.07.2026
SUSP_BAT_PatchAgent_Jul26
Detects batch scripts that change to a UNC or WebDAV share and start a process in the background, as observed in related MuddyWater ClickFix activity
29.07.2026
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
HKTL_Clash_Tunneling_Tool_Aug22_2
1
b534f261dc0adc573027e7f8cc4f6bbeafd0a48c7d92c3ce19fe1ce7c78ea375
HKTL_PS1_Loader_Characteristics_Sep25_2
2
b694477a9bb2893d7b38584aac3992c305a4e02508f6f907b95b9499c46fd8d6
HKTL_PS1_Shells_Indicators_Feb22_1
1
0095d63da418e9db72d3e9c714c40959c93901e7f4e445d32fcd1d5f89b9760f
MAL_Sednit_DelphiDownloader_Apr18_2
1
116b6227c864ab3d53acfeadbd9670b292d2ea77eec376f4dd3cb4a231d6df52
SUSP_HKTL_LNX_CheatSheet_Commands
10
63da6ec89f41262c3adc1d43fb2fe27652ccdaf34e2d985bfdbae247cd5afc51
MAL_Sednit_DelphiDownloader_Apr18_2
1
bc276da11fdf6a2d241343f4b3b179cf85908e3e923efdec23e025f62794c58f
MAL_OBFUSC_HTA_HelpFiles_Oct20_1
10
5f3fe11254ecdc80668bdfe6d55852056867c2801d65d2f6e41b487e38aa8a6b
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
7815
Threat Hunting (not subscribable, only in THOR scanner)
6013
APT
5084
Hacktools
4893
Webshells
2405
Exploits
746
Newest Sigma Rules
This table shows the newest additions to the Sigma rule set
Rule
Description
Date
Ref
Info
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
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 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
Node.Js Inline Script Network Connection - Linux
Detects inline Node.js scripts that establish network connections, which may indicate malicious activity such as data exfiltration or command-and-control communication.
Attackers may use inline Node.js scripts to quickly execute code that interacts with the network without leaving a persistent file on disk.
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
Node.Js Inline Script Network Connection
Detects inline Node.js scripts that establish network connections, which may indicate malicious activity such as data exfiltration or command-and-control communication.
Attackers may use inline Node.js scripts to quickly execute code that interacts with the network without leaving a persistent file on disk.
07.08.2026
Suspicious Node.js Child Process with IPv4 Address
Detects a Node.js child process command line containing an IPv4 address.
This might indicate a malicious npm postinstall script downloading second-stage payloads or establishing reverse shells, as observed in various malicious npm campaigns or supply chain attacks.
07.08.2026
ADCS - Certighost Ghost Machine Account Creation
Detects the creation of a machine account whose name starts with 'GHOST', which is the
naming convention used by the CVE-2026-54121 (Certighost) exploit tooling.
The public proof-of-concept for Certighost creates a temporary machine account with a
name of the form GHOST<random>$ before enrolling for a DC certificate via the cdc chase
path. The attacker-controlled machine account is used as the requester identity in the
certificate request; the cdc attribute then redirects the CA to a rogue host that returns
a forged Domain Controller identity. The resulting certificate carries the DC's SID and
DNS name, enabling full PKINIT authentication as the targeted DC followed by DCSync.
A machine account creation event (4741) where TargetUserName starts with 'GHOST' and
ends with '$' is a high-fidelity indicator of this attack tool's execution. Legitimate
environments very rarely provision machine accounts with this prefix.
30.07.2026
ADCS - Certighost CDC Chase Certificate Request (CVE-2026-54121)
Detects Active Directory Certificate Services (ADCS) certificate requests that include the
'cdc' (Client DC) request attribute pointing to a domain or IP that is not a known Domain Controller.
'cdc' is an optional MS-WCCE enrollment attribute designed for cross-domain/cross-forest
scenarios where a client in a child domain tells the CA which DC to contact for identity
lookups when the CA cannot reach that domain directly. Legitimate values are DC hostnames
or IPs that resolve to a real Domain Controller computer object in AD with the
SERVER_TRUST_ACCOUNT (0x2000) userAccountControl bit set.
In an attack, the attacker sets cdc to a domain or IP they control so the CA connects to their
rogue SMB and LDAP services instead of a real DC. The rogue server returns a forged DC
identity which the pre-patch CA accepts without validation. A malicious event looks like:
Requester: DOMAIN\GHOST<random>$
Attributes: cdc:<attacker_ip>
rmd:<target_dc_fqdn>
SubjectAlternativeName: DNS Name=<target_dc_fqdn>
CVE-2026-54121 (Certighost) is the known exploit for this path. The July 2026 patch added
_ValidateChaseTargetIsDC which rejects cdc values that do not resolve to a legitimate
DC object in Active Directory before following the chase.
27.07.2026
ADCS - Certighost Certificate Issued via CDC Chase (CVE-2026-54121)
Detects successful issuance of an ADCS certificate where the request attributes include
'cdc' (Client DC) or 'rmd' (Remote Domain) pointing to a non-DC domain or IP, confirming the
CA's chase fallback path was taken against an attacker-controlled target.
'cdc' directs the CA to an address for identity lookup; 'rmd' specifies the principal to
look up there. In an attack (CVE-2026-54121, Certighost), cdc points to a rogue host that
returns a forged DC identity. A successfully issued certificate at this stage means the
attacker has obtained a cert carrying a Domain Controller's SID and DNS identity, enabling
PKINIT authentication as that DC followed by DCSync replication.
27.07.2026
Registry Hive File Staged Outside Standard User Profile Path
Detects the creation of a registry hive file (UsrClass.dat or NTUSER.DAT) outside of the standard user profile path.
These files generally contain various user-specific registry settings and are typically located in the user's profile directory.
Staging these files outside of the standard path can be indicative of an attacker attempting to manipulate user registry settings
for persistence, privilege escalation, or dump user registry hives for credential harvesting.
23.07.2026
Suspicious Cross-User Process Spawn
Detects suspicious spawning of a process under a different user context than the parent process.
Processes such as notepad.exe, calculator etc. are generally spawned under the same user context and
also they are often targeted as sacrificial process or decoy process to check successful privilege escalation.
23.07.2026
Potentially Suspicious Explicit Credential Local Logon
Detects potentially suspicious explicit credential logon events where the user
is trying to logon with explicit credentials (username and password) that are
different from the current user context. It might indicate an attacker attempting
to escalate privileges after obtaining credentials for a different user account.
23.07.2026
Potentially Suspicious Image Load of Offreg.dll
Detects potentially suspicious loading of the Offline Registry Library (offreg.dll).
Offreg.dll enables direct read/write access to offline registry hives without invoking the Windows Registry API,
bypassing its associated audit logging and telemetry. Attackers may abuse this to stealthily modify registry hives
while evading detection mechanisms that rely on standard registry event logs.
23.07.2026
Suspicious Creation of .NET Binaries or Configs Outside Legitimate Paths
Detects creation of .NET framework binaries or configuration files outside of legitimate installation paths.
It might indicate attempts to establish persistence or execute malicious code using the AppDomainManager technique.
In this technique, adversaries may create or modify .NET binaries or configuration files in non-standard locations
to hijack the AppDomainManager, which is responsible for managing application domains in the .NET framework.
This can allow attackers to execute malicious code with elevated privileges or maintain persistence on a compromised system.
20.07.2026
AppDomainManager Environment Variable Hijack - PsScript
Detects the usage of environment variables related to the .NET AppDomainManager within PowerShell scripts.
The presence of these variables in script content may indicate attempts to hijack the AppDomainManager,
allowing adversaries to execute malicious code within trusted processes.
Setting these variables in scripts can force legitimate .NET applications to load attacker-controlled assemblies,
enabling stealthy code execution and persistence.
20.07.2026
AppDomainManager Environment Variable Hijack
Detects the use of environment variables related to the .NET AppDomainManager,
which can be hijacked by adversaries to execute malicious code within trusted processes.
Adversaries can set these variables to point to a malicious assembly, forcing legitimate
.NET applications to load it upon startup.
This technique allows for stealthy code execution within trusted, signed processes.
20.07.2026
Modification of AppDomain Manager Environment Variables
Detects modification of AppDomain Manager environment variables in the registry,
which can be abused to hijack .NET AppDomain Manager.
Adversaries can set these variables to point to a malicious assembly, causing any legitimate
.NET applications to load it upon startup, enabling stealthy code execution.
20.07.2026
NET Config File Creation in Suspicious Location
Detects .NET configuration files (.exe.config) with potential AppDomainManager hijack patterns
being created in suspicious or non-standard locations.
Adversaries may create or modify .NET configuration files in non-standard locations to hijack
the AppDomainManager, which is responsible for managing application domains in the .NET framework.
20.07.2026
NET Config File Creation by Potentially Suspicious Process
Detects .NET configuration files (.exe.config) with potential AppDomainManager hijack patterns
being created by suspicious processes such as scripting engines, downloaders, or interpreters.
Adversaries may use these processes to drop .NET configuration files that hijack the AppDomainManager,
which is responsible for managing application domains in the .NET framework.
20.07.2026
WordPress Wp2shell REST Batch Endpoint Exploitation
Detects exploitation attempts against the WordPress REST batch endpoint (CVE-2026-63030,
CVE-2026-60137) using the wp2shell PoC tool. The tool sends POST requests to the batch endpoint
via the ?rest_route=/batch/v1 query parameter, covering all attack phases from initial probe
through SQL injection and pre-auth admin creation. A 207 response confirms the endpoint is
active on the target.
19.07.2026
WordPress Wp2shell Exploitation Tool User-Agent
Detects the hardcoded "wp2shell" User-Agent string used by the wp2shell
PoC tool during all phases of CVE-2026-63030 and CVE-2026-60137 exploitation.
19.07.2026
WordPress Wp2shell Webshell Plugin Access
Detects post-exploitation access to the wp2shell webshell plugin dropped after successful
exploitation of CVE-2026-63030 and CVE-2026-60137. After the pre-auth SQLi-to-admin bridge is established,
the attacker can upload a malicious plugin (wp2shell) to the target WordPress instance.
At this phase, the attacker accesses the webshell for command execution and persistence.
19.07.2026
Inverted Windows System Path Strings in CommandLine
Detects reversed/inverted strings of Windows system directory paths in command line
arguments. Adversaries may reverse path strings to conceal references to system
directories and bypass static string-based detection.
17.07.2026
Inverted Malware-Abused Path Strings in CommandLine
Detects reversed/inverted strings of writable Windows directories commonly abused
by malware as staging, persistence, or execution locations. Adversaries may reverse
path strings to bypass static path-based detection signatures.
17.07.2026
YARA/SIGMA Rule Count
Rule Type
Community Feed
Nextron Private Feed
Yara
1391
23059
Sigma
3614
1086
Sigma Rules Per Category (Community)
Type
Count
windows / process_creation
1357
windows / registry_set
219
windows / file_event
211
windows / ps_script
166
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
azure / riskdetection
19
windows / pipe_created
19
azure / signinlogs
18
rpc_firewall / application
17
windows / windefend
17
linux / file_event
16
gcp / gcp.audit
16
linux
16
github / audit
15
bitbucket / audit
14
windows / file_delete
13
m365 / threat_management
13
cisco / aaa
13
windows / create_remote_thread
12
windows / driver_load
10
windows / registry_delete
10
kubernetes / application / audit
10
windows / codeintegrity-operational
10
dns
10
windows / appxdeployment-server
9
antivirus
9
windows / ps_classic_start
9
windows / create_stream_hash
9
windows / firewall-as
8
windows / msexchange-management
8
azure / pim
7
windows / file_access
7
windows / bits-client
7
gcp / google_workspace.admin
7
zeek / smb_files
7
fortigate / event
7
kubernetes / audit
6
windows / dns-client
6
jvm / application
5
zeek / dns
5
linux / network_connection
5
zeek / http
5
zeek / dce_rpc
4
m365 / audit
4
macos / file_event
4
windows / taskscheduler
4
windows / sysmon
4
windows / iis-configuration
4
linux / sshd
3
windows / registry_add
3
gcp / google_workspace.login
3
windows / wmi_event
3
windows / powershell-classic
3
windows / ntlm
3
windows / security-mitigations
2
linux / syslog
2
spring / application
2
windows / dns-server
2
apache
2
onelogin / onelogin.events
2
windows / wmi
2
windows / applocker
2
firewall
2
fortios / sslvpnd
1
linux / guacamole
1
huawei / bgp
1
windows / openssh
1
cisco / syslog
1
linux / cron
1
juniper / bgp
1
windows / appxpackaging-om
1
windows / smbclient-connectivity
1
windows / smbserver-connectivity
1
windows / file_change
1
windows / process_tampering
1
nodejs / application
1
paloalto / file_event / globalprotect
1
zeek / x509
1
windows / capi2
1
paloalto / appliance / globalprotect
1
windows / certificateservicesclient-lifecycle-system
1
windows / shell-core
1
windows / raw_access_thread
1
python / application
1
linux / vsftpd
1
windows / microsoft-servicebus-client
1
windows / diagnosis-scripted
1
windows / smbclient-security
1
windows / file_executable_detected
1
ruby_on_rails / application
1
m365 / exchange
1
zeek / rdp
1
windows / file_rename
1
windows / sysmon_status
1
zeek / kerberos
1
windows / terminalservices-localsessionmanager
1
windows / sysmon_error
1
m365 / threat_detection
1
windows / driver-framework
1
velocity / application
1
windows
1
sql / application
1
cisco / duo
1
nginx
1
linux / sudo
1
cisco / ldp
1
windows / ldap
1
windows / dns-server-analytic
1
database
1
cisco / bgp
1
windows / lsa-server
1
windows / ps_classic_provider_start
1
windows / printservice-operational
1
linux / clamav
1
django / application
1
windows / printservice-admin
1
linux / auth
1
windows / appmodel-runtime
1
Sigma Rules Per Category (Nextron Private Feed)
Type
Count
windows / process_creation
537
windows / registry_set
95
windows / ps_script
91
linux / process_creation
66
windows / file_event
52
windows / image_load
48
windows / security
29
windows / wmi
29
proxy
13
windows / system
13
windows / network_connection
9
windows / registry_event
8
windows / kernel-event-tracing
6
windows / ntfs
5
windows / ps_module
5
windows / dns_query
5
windows / sense
4
windows / pipe_created
4
webserver
4
windows / taskscheduler
4
windows / registry_delete
4
windows / create_remote_thread
4
macos / process_creation
3
dns
3
windows / ps_classic_script
3
windows / vhd
3
windows / application-experience
3
windows / hyper-v-worker
3
windows / driver_load
3
windows / kernel-shimengine
2
linux / Linux kernel module / THOR
2
windows / smbclient-security
2
windows / windefend
2
windows / process_access
2
windows / codeintegrity-operational
2
windows / file_access
2
windows / file_delete
2
windows / bits-client
2
linux / file_event
2
windows / file_rename
1
linux / Unix user / THOR
1
windows / amsi
1
windows / application
1
windows / posh_ps
1
windows / environment variable / THOR
1
windows / firewall-as
1
windows / registry-setinformation
1
linux / file_delete
1
windows / audit-cve
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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