currently serving 23593 YARA rules and 4390 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
SUSP_B64_Encoded_AppDomainManager_Config_Feb26
Detects Base64 encoded .NET application configuration files used to instantiate the AppDomainManager class
09.02.2026
SUSP_B64_Encoded_AppDomainManager_CS_Feb26
Detects Base64 encoded C# code overwriting the AppDomainManager
09.02.2026
HKTL_Unknown_C2_Stager_Feb26
Detects unknown C2 stager
07.02.2026
HKTL_KillEDR_Feb26_1
Detects unknown EDR killer tools
07.02.2026
HKTL_SharpEDRChecker_Feb26_1
Detects Sharp EDR Checker - a tool that checks for the presence of known defensive products such as AV and EDRs
07.02.2026
HKTL_Novel_EDR_Evasion_Feb26
Detects unknown EDR killer tools
07.02.2026
HKTL_KillEDR_Feb26_2
Detects unknown EDR killer tools
07.02.2026
HKTL_KillEDR_Feb26_3
Detects unknown EDR killer tools
07.02.2026
MAL_NET_RedKitten_SloppyMio_Feb26
Detects .NET based rat implant observed to be used by Iranian threat actors. The implant exploits the legitimate AppVStreamingUX to sideload itsself.
06.02.2026
SUSP_AntiRootkit_Keywords_Feb26
Detects suspicious keywords related to debugger and anti rootkit. This may be used to evade detection.
05.02.2026
MAL_DKnife_Gateway_Monitoring_Framework_Feb26
Detects the DKnife gateway monitoring framework.
05.02.2026
MAL_Dknife_VPN_Client_HA_PROXY_Feb26
Detects customized N2N (a P2P) VPN client component used by DKnife to contact to C2 (remote.bin), reverse proxy server module modified from HAProxy (sslmm.bin), labelling and relay component (postapi.bin), bridged TAP interface (yitiji.bin) and dkupdate (dkupdate)
05.02.2026
MAL_MACOS_Phishing_Dropper_Feb26
Detects Apple Disk Image containing a malicious dropper script for executing further payloads. Actors often use phishing lures to make the victim unknowingly execute the arbitrary code.
03.02.2026
MAL_POC_Microsoft_Warbird_Loader_Feb26
Detects a POC to turn Microsoft Warbird into a shellcode loader
03.02.2026
MAL_LNX_Stealth_Persistence_Framework_Feb26
Detects the Stealth Persistence Framework on Linux systems, which is used for maintaining unauthorized access.
02.02.2026
MAL_Chrysalis_DllLoader_Feb26
Detects DLL used to load Chrysalis backdoor, seen being used in the compromise of the infrastructure hosting Notepad++ by Chinese APT group Lotus Blossom
02.02.2026
MAL_Chrysalis_Shellcode_Loader_Feb26
Detects shellcode used to load Chrysalis backdoor, seen being used in the compromise of the infrastructure hosting Notepad++ by Chinese APT group Lotus Blossom
02.02.2026
MAL_Chrysalis_Backdoor_Feb26
Detects Chrysalis backdoor, seen being used in the compromise of the infrastructure hosting Notepad++ by Chinese APT group Lotus Blossom
02.02.2026
SUSP_OBFUSC_PS1_Quote_IWR_Jan26
Detects suspicious PowerShell scripts that use obfuscated quotes in IWR commands
30.01.2026
MAL_Shellcode_Loader_Jan26_1
Detects a shellcode loader that is used to allocate memory, write shellcode, and execute it, seen being used by Patchwork APT group
30.01.2026
MAL_Claude_Encoded_Refusal_Magic_String_Jan26
Detects encoded variations of the refusal magic string that cause Claude sessions to be terminated. This might indicate that a file tries to prevent being analyzed by LLM agents.
30.01.2026
SUSP_Claude_Encoded_Redacted_Thinking_Magic_String_Jan26
Detects encoded variations of the redacted thinking magic string that cause Claude sessions to be terminated. This might indicate that a file tries to prevent being analyzed by LLM agents.
30.01.2026
SUSP_Claude_Refusal_Magic_String_Jan26
Detects refusal magic string that cause Claude sessions to be terminated. This might indicate that a file tries to prevent being analyzed by LLM agents.
29.01.2026
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_OBF_NET_Reactor_JIT_Encryption_Feb25
8
b598ab5a68386573fff4a41f74506d62cb606efaa0b7a5eea355792628ef6996
SUSP_PS1_OFBUSC_XOR_Encryption_Aug23
10
de480a5f616b350fb25852e8e42f354f1f234bf239af9830021e6d5e7f4fca58
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
13
1e26c418075cfab79287800dde72ad7c1e4a52ce4dbe970bb18f4809cca0a78c
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
13
0fb5f935e7a3dd98119017d742cc1daed50e1fbd8e2fec64b760ad5aa2d9dabf
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
13
e1975dcd597e5211307d251e96b322df5e13523bf7edf476788049d3ed5b892a
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
13
900fe44f79939bfa47b67a95ff7f722ee614b83e69c0ad800e30c717ae7c2edd
SUSP_Encoded_GetProcAddress_Mar19
8
0d64adf535442ace8a450aef525472bd3437a29b205fdff60386a928ee3d9988
SUSP_Monitoring_Procs_List_Sep22_1
6
b1ff45e7b9c16c01c43650d7137850bc984d74a735779ea01b4043315a345b87
SUSP_MSIL_NET_OBF_ConfuserEx_Constants_Jul23
7
d8b2ff4c93579d45e8f0b90523d09588f67d3be23c6843990b3c9a6aad0529c0
SUSP_OBFUSC_Base64_Hex_Encoded_Apr19
13
a34fcbd421aa996b504d5130a2d90bdb8a27673256576572256f61116d41035b
SUSP_OBFUSC_Reversed_Encoded_Executable_Mar22
5
f9ea2d9b7a8e53039ff11c62f266b8e4913cfd494b54b74716da276777aeca96
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
7432
Threat Hunting (not subscribable, only in THOR scanner)
5769
APT
5042
Hacktools
4809
Webshells
2397
Exploits
713
Newest Sigma Rules
This table shows the newest additions to the Sigma rule set
Rule
Description
Date
Ref
Info
Renamed TinyCC (TCC) Compiler Execution
Detects the execution of a renamed TinyCC (TCC) Compiler (tcc.exe)
Attackers have been observed renaming tcc.exe to masquerade as legitimate Windows binaries (e.g., svchost.exe) to compile and execute malicious C code in memory, such as shellcode loaders.
This technique was observed in Chrysalis backdoor attacks.
03.02.2026
Suspicious Child Process of Notepad++ Updater - GUP.Exe
Detects suspicious child process creation by the Notepad++ updater process (gup.exe).
This could indicate potential exploitation of the updater component to deliver unwanted malware.
03.02.2026
Uncommon File Created by Notepad++ Updater Gup.EXE
Detects when the Notepad++ updater (gup.exe) creates files in suspicious or uncommon locations.
This could indicate potential exploitation of the updater component to deliver unwanted malware or unwarranted files.
03.02.2026
Tiny C Compiler Runtime Execution
Detects execution of Tiny C Compiler (TCC) which compiles and executes C code directly in memory.
This technique was observed in Chrysalis backdoor campaigns where attackers renamed tcc.exe to svchost.exe and used it
to load shellcode from .c files directly into memory, bypassing traditional detection methods.
03.02.2026
Notepad++ Updater DNS Query to Uncommon Domains
Detects when the Notepad++ updater (gup.exe) makes DNS queries to domains that are not part of the known legitimate update infrastructure.
This could indicate potential exploitation of the updater mechanism or suspicious network activity that warrants further investigation.
02.02.2026
CLSID DefaultIcon Value Tampering
Detects potential COM object hijacking. Adversaries have used CLSID DefaultIcon to reference malicious payload, encrypted payloads, or conceal payload execution paths as part of defense-evasion and persistence chains.
31.01.2026
Suspicious Modification of Service ImagePath for ClipUp Defender Evasion
Detects registry modifications that set the ImagePath of a service to execute ClipUp.exe with Protected Process Light (PPL) parameters targeting Windows Defender locations.
This technique is used by attackers to replace the Windows Defender service executable before it initializes, effectively bypassing security protections.
The approach leverages CreateProcessAsPPL.exe to obtain PPL privileges, which normally protect security software from tampering.
29.01.2026
Windows Defender Critical Binary Deletion
Detects the deletion of critical Windows Defender binaries which could indicate an attempt to disable or manipulate Windows Defender.
29.01.2026
Suspicious File Creation by Clipup in Windows Defender Directory
Detects file creation by Clipup.exe in the Windows Defender program files directory.
ClipUp.exe may be used to overwrite the service executable of Windows Defender, potentially allowing an attacker to disable or manipulate Windows Defender.
29.01.2026
Suspicious ClipUp Execution with Windows Defender Path
Detects suspicious execution of ClipUp.exe with parameters that may indicate an attempt to write to Windows Defender protected locations.
ClipUp.exe may be used to overwrite the service executable of Windows Defender, potentially allowing an attacker to disable or manipulate Windows Defender.
29.01.2026
Windows Defender Folder Invocation Through Short Name
Detects suspicious command line patterns where a process is invoking a path within the Windows Defender folder using its short name (8.3 notation).
This technique may be used to execute or manipulate Windows Defender binaries while evading detection mechanisms that do not account for short path names.
29.01.2026
Velociraptor Abuse via Suspicious PowerShell Commands
Detects Velociraptor.exe being abused to execute suspicious PowerShell or command-line activity indicative of post-exploitation behavior.
27.01.2026
Suspicious Velociraptor Spwaned Processes
Detects the suspicious use of the Velociraptor DFIR tool to execute other tools or download additional payloads, as seen in a campaign where it was abused for remote access and to stage further attacks.
27.01.2026
Hypervisor-protected Code Integrity (HVCI) Related Registry Tampering Via CommandLine
Detects the tampering of Hypervisor-protected Code Integrity (HVCI) related registry values via command line tool reg.exe.
HVCI uses virtualization-based security to protect code integrity by ensuring that only trusted code can run in kernel mode.
Adversaries may tamper with HVCI to load malicious or unsigned drivers, which can be used to escalate privileges, maintain persistence, or evade security mechanisms.
26.01.2026
Vulnerable Driver Blocklist Registry Tampering Via CommandLine
Detects tampering of the Vulnerable Driver Blocklist registry via command line tools such as PowerShell or REG.EXE.
The Vulnerable Driver Blocklist is a security feature that helps prevent the loading of known vulnerable drivers.
Disabling this feature may indicate an attempt to bypass security controls, often targeted by threat actors
to facilitate the installation of malicious or vulnerable drivers, particularly in scenarios involving Endpoint Detection and Response
26.01.2026
Windows Vulnerable Driver Blocklist Disabled
Detects when the Windows Vulnerable Driver Blocklist is set to disabled. This setting is crucial for preventing the loading of known vulnerable drivers,
and its modification may indicate an attempt to bypass security controls. It is often targeted by threat actors to facilitate the installation of malicious or vulnerable drivers,
particularly in scenarios involving Endpoint Detection and Response (EDR) bypass techniques.
This rule applies to systems that support the Vulnerable Driver Blocklist feature, including Windows 10 version 1903 and later, and Windows Server 2022 and later.
Note that this change will require a reboot to take effect, and this rule only detects the registry modification action.
26.01.2026
Linux Setgid Capability Set on a Binary via Setcap Utility
Detects the use of the 'setcap' utility to set the 'setgid' capability (cap_setgid) on a binary file.
This capability allows a non privileged process to make arbitrary manipulations of group IDs (GIDs), including setting its current GID to a value that would otherwise be restricted (i.e. GID 0, the root group).
This behavior can be used by adversaries to backdoor a binary in order to escalate privileges again in the future if needed.
24.01.2026
Linux Setuid Capability Set on a Binary via Setcap Utility
Detects the use of the 'setcap' utility to set the 'setuid' capability (cap_setuid) on a binary file.
This capability allows a non privileged process to make arbitrary manipulations of user IDs (UIDs), including setting its current UID to a value that would otherwise be restricted (i.e. UID 0, the root user).
This behavior can be used by adversaries to backdoor a binary in order to escalate privileges again in the future if needed.
24.01.2026
Registry Modification for OCI DLL Redirection
Detects registry modifications related to 'OracleOciLib' and 'OracleOciLibPath' under 'MSDTC' settings.
Threat actors may modify these registry keys to redirect the loading of 'oci.dll' to a malicious DLL, facilitating phantom DLL hijacking via the MSDTC service.
24.01.2026
Cmd Launched with Hidden Start Flags to Suspicious Targets
Detects cmd.exe executing commands with the "start" utility using "/b" (no window) or "/min" (minimized) flags.
To reduce false positives from standard background tasks, detection is restricted to scenarios where the target is a known script extension or located in suspicious temporary/public directories.
This technique was observed in Chaos, DarkSide, and Emotet malware campaigns.
24.01.2026
Suspicious Shell Open Command Registry Modification
Detects modifications to shell open registry keys that point to suspicious locations typically used by malware for persistence.
Generally, modifications to the `*\shell\open\command` registry key can indicate an attempt to change the default action for opening files,
and various UAC bypass or persistence techniques involve modifying these keys to execute malicious scripts or binaries.
24.01.2026
File Sync to NTUSER.MAN on Roaming Profile Shares
Detects file synchronization events involving 'NTUSER.MAN' files on roaming profile shares.
NTUSER.MAN is a mandatory user profile file that takes priority over NTUSER.DAT when present in a user's profile directory.
Adversaries may abuse this feature for registry persistence by placing a crafted NTUSER.MAN file containing malicious registry keys.
This technique also don't produce registry telemetry as the hive is loaded directly from disk without invoking registry APIs or triggering CmRegisterCallbackEx callbacks.
Mandatory profiles are rare in modern environments outside of kiosk or shared workstation configurations, making their presence suspicious.
Consider excluding specific admin tools or scripts if this is common in your environment.
21.01.2026
AD User ProfilePath Attribute Modification
Detects changes to the 'ProfilePath' attribute of an Active Directory user account.
Attackers can modify this attribute to point to a roaming profile to establish persistence or lateral movement within a network.
One of the example includes updating the profilepath to network share to sync malicious NTUSER.MAN files for registry persistence.
Since, this event can be generated during legitimate administrative activities, it is recommended to validate the legitimacy of such changes by cross-referencing with change management logs or known administrative actions.
21.01.2026
Creation of NTUSER.MAN File in User Profile
Detects the creation of an NTUSER.MAN file in a user's profile directory.
NTUSER.MAN is a mandatory user profile file that takes priority over NTUSER.DAT when present in a user's profile directory.
Adversaries may abuse this feature for registry persistence by placing a crafted NTUSER.MAN file containing malicious registry keys.
This technique also don't produce registry telemetry as the hive is loaded directly from disk without invoking registry APIs or triggering CmRegisterCallbackEx callbacks.
Mandatory profiles are rare in modern environments outside of kiosk or shared workstation configurations, making their presence suspicious.
21.01.2026
Usage of NTUSER.MAN in Command Line
Detects the string 'NTUSER.MAN' in a command line, which may indicate attempts to manipulate or utilize mandatory user profile files.
NTUSER.MAN is a mandatory user profile file that takes priority over NTUSER.DAT when present in a user's profile directory.
Adversaries may abuse this feature for registry persistence by placing a crafted NTUSER.MAN file containing malicious registry keys.
This technique also don't produce registry telemetry as the hive is loaded directly from disk without invoking registry APIs or triggering CmRegisterCallbackEx callbacks.
Mandatory profiles are rare in modern environments outside of kiosk or shared workstation configurations, making their presence suspicious.
21.01.2026
NTUSER.MAN Creation From Process In Suspicious Location
Detects the creation of an NTUSER.MAN file from process in suspicious location
20.01.2026
NTUSER.MAN Creation By Uncommon Processes
Detects the creation of an NTUSER.MAN file by Uncommon processes
20.01.2026
Suspicious NTUSER.MAN Creation by Uncommon Process
Detects creation of NTUSER.MAN (mandatory profile hive) by uncommon processes.
20.01.2026
Hacktool - Kernel Driver Utility Execution
Detects execution of the Kernel Driver Utility (KDU) tool.
KDU can be used to bypass driver signature enforcement and load unsigned or malicious drivers into the Windows kernel.
12.01.2026
YARA/SIGMA Rule Count
Rule Type
Community Feed
Nextron Private Feed
Yara
2720
20873
Sigma
3540
850
Sigma Rules Per Category (Community)
Type
Count
windows / process_creation
1331
windows / registry_set
219
windows / file_event
206
windows / ps_script
165
windows / security
160
linux / process_creation
131
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
27
windows / process_access
25
azure / signinlogs
24
okta / okta
22
azure / riskdetection
19
opencanary / application
18
windows / pipe_created
18
rpc_firewall / application
17
gcp / gcp.audit
16
windows / windefend
16
linux
16
github / audit
16
bitbucket / audit
14
linux / file_event
13
m365 / threat_management
13
windows / file_delete
13
cisco / aaa
12
windows / create_remote_thread
12
kubernetes / application / audit
10
windows / codeintegrity-operational
10
windows / driver_load
10
windows / registry_delete
10
windows / ps_classic_start
9
dns
9
windows / appxdeployment-server
9
windows / create_stream_hash
9
windows / firewall-as
8
windows / msexchange-management
8
zeek / smb_files
7
gcp / google_workspace.admin
7
antivirus
7
fortigate / event
7
windows / file_access
7
windows / bits-client
7
azure / pim
7
windows / dns-client
6
zeek / dns
5
zeek / http
5
linux / network_connection
5
jvm / application
5
kubernetes / audit
5
windows / sysmon
4
windows / taskscheduler
4
windows / iis-configuration
4
zeek / dce_rpc
4
windows / registry_add
3
linux / sshd
3
m365 / audit
3
macos / file_event
3
windows / wmi_event
3
windows / powershell-classic
3
windows / ntlm
3
linux / syslog
2
windows / security-mitigations
2
windows / dns-server
2
apache
2
spring / application
2
onelogin / onelogin.events
2
firewall
2
windows / capi2
1
windows / shell-core
1
windows / file_change
1
paloalto / file_event / globalprotect
1
zeek / x509
1
windows / certificateservicesclient-lifecycle-system
1
windows / microsoft-servicebus-client
1
windows / raw_access_thread
1
nodejs / application
1
paloalto / appliance / globalprotect
1
windows / diagnosis-scripted
1
windows / smbclient-security
1
windows / file_executable_detected
1
python / application
1
zeek / rdp
1
windows / file_rename
1
windows / sysmon_error
1
m365 / exchange
1
zeek / kerberos
1
windows / terminalservices-localsessionmanager
1
windows / sysmon_status
1
ruby_on_rails / application
1
windows / driver-framework
1
windows
1
m365 / threat_detection
1
sql / application
1
nginx
1
linux / sudo
1
velocity / application
1
cisco / duo
1
cisco / bgp
1
windows / ldap
1
windows / wmi
1
windows / dns-server-analytic
1
cisco / ldp
1
windows / ps_classic_provider_start
1
windows / printservice-admin
1
windows / lsa-server
1
windows / printservice-operational
1
database
1
linux / clamav
1
windows / appmodel-runtime
1
django / application
1
linux / auth
1
huawei / bgp
1
windows / applocker
1
windows / openssh
1
fortios / sslvpnd
1
linux / guacamole
1
juniper / bgp
1
windows / appxpackaging-om
1
windows / process_tampering
1
cisco / syslog
1
linux / cron
1
windows / smbserver-connectivity
1
windows / smbclient-connectivity
1
linux / vsftpd
1
Sigma Rules Per Category (Nextron Private Feed)
Type
Count
windows / process_creation
401
windows / registry_set
79
windows / ps_script
77
windows / image_load
44
windows / file_event
43
linux / process_creation
37
windows / wmi
29
windows / security
24
proxy
12
windows / system
9
windows / registry_event
8
windows / network_connection
8
windows / kernel-event-tracing
6
windows / ntfs
5
windows / ps_module
5
windows / create_remote_thread
4
windows / registry_delete
4
windows / sense
4
windows / pipe_created
4
windows / taskscheduler
4
windows / hyper-v-worker
3
windows / application-experience
3
windows / driver_load
3
windows / ps_classic_script
3
windows / vhd
3
webserver
3
windows / process-creation
2
windows / kernel-shimengine
2
windows / file_delete
2
windows / bits-client
2
macos / process_creation
2
windows / windefend
2
windows / process_access
2
windows / codeintegrity-operational
2
windows / file_access
1
windows / registry-setinformation
1
windows / amsi
1
windows / dns_query
1
linux / file_event
1
windows / audit-cve
1
windows / file_rename
1
windows / firewall-as
1
windows / application
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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