Based on the principles of transparency, accessibility, usability, verifiability and perceptibility of security capabilities, Antiy releases weekly updates of the AVL SDK anti-virus engine and the full set of capabilities to the public every week.

1. Weekly Update

Statistical period: April 5, 2025 ~ April 11, 2025

Antiy AVL SDK anti-virus engine released a total of 84 virus database updates this week, with an average of 12 updates per day, adding 41 new detectable malware families, 31,723 new detectable malware variants, and 46,673 new detection rules.

The following table shows the TOP5 newly detectable malware families:

Number	Virus Name	Virus Description
1	Trojan/Win64.BrockenDoor[Backdoor]	This family is a kind of Trojan, mainly spreading through the Internet, and is characterized by strong concealment and great destructive power. This virus enables remote hackers to remotely control the system, which may lead to the leakage of users’ private data, system crashes and other serious consequences.
2	HackTool/Win32.Sourfol	This family is a kind of hacking tool, mainly spreading by infiltrating user systems, operating system vulnerabilities or software vulnerabilities, and hiding its malicious programs in the system to steal user information, damage system functions and pose a serious threat to the system.
3	Trojan/HTML.FryFish	This family is a kind of Trojan, usually hidden in web pages or email attachments, used to deceive users into clicking, and has strong concealment. Once users execute malicious code, it will lead to serious consequences such as the leakage of users’ personal information and the theft of accounts, seriously infringing upon users’ privacy and security.
4	Trojan/Win64.Sokbafig[Backdoor]	This family is a kind of Trojan. It mainly penetrates the victim’s host through various means such as instant messaging software, search engine SEO promotion, and phishing emails. By forging the software’s own information, it connects to suspicious IP addresses, steals the victim’s data, and controls the victim’s computer.
5	Trojan/Win32.Mbinder[Dropper]	This family is a kind of Trojan, mainly spreading through online downloads. It has the characteristics of independent transmission and strong concealment. It will try to hide itself, steal users’ sensitive information, and damage the security and stability of the system.

(According to the HASH number of family samples within the period)

For more related content, please visit www.virusview.net (the Computer Virus Encyclopedia).

2. Full Detection Capabilities

As of 24:00 on April 11, 2025, the AVL SDK anti-virus engine can detect 18,012,891 malware variants of 56,519 malware families distributed in 8 basic categories, with a total of 56,420,422 detection rules.

The detection capabilities and the number of rules classified by malware are as follows:

Type	Detectable malware (Types)	Detection rules (Items)
Infectious viruses	57,823	9,609,814
Worms	303,552	5,528,644
Trojans	13,032,055	33,781,859
Hacking tools	444,175	468,452
Risk tools	1,190,385	2,988,866
Rogue software	2,984,877	4,033,274
Junk files	10	1,523
Test programs (for self-test)	14	7,990
Total	18,012,891	56,420,422

Preprocessing Capabilities (partial) :

There are 31 types of unpackable executable packers and 132 types of recognizable or extractable packages (including self-extracting archives).

Supporting Knowledge Output Capabilities:

For malware payloads, the AVL SDK is used in conjunction with the malware knowledge base, which can output 533 types of key behavior mapping tags and 139 types of ATT&CK threat attack framework technical and tactical tags, with a coverage rate of 64.29%, basically covering all the statically detectable tags in the ATT&CK framework.

3. Be on Guard Against These Virus Families This Week

Recently, Antiy Labs detected an active Trojan sample Trojan/Win64.Sokbafig[Backdoor] on the Windows platform. This family infiltrates the victim’s host through various means such as instant messaging software (Wechat, Enterprise Wechat, etc.), search engine SEO promotion, and phishing emails. The Sokbafig backdoor software conducts attacks in a “white + black” form, forges its own information, connects to suspicious IP addresses, steals the victim’s data, and controls the victim’s computer to make it part of a botnet.

3.1 Overview of the Sokbafig Trojan Family

Family name	Sokbafig
Appearance time	March 2025
Transmission pathways	instant messaging software (Wechat, Enterprise Wechat, etc.), search engine SEO promotion, and phishing emails
Targeted system	Windows
Technical features	“white + black”
Main hazards	Steal personal information
Utilize components/related families	Mirai Gafgyt

3.2 Recommendations for Protection

For this Trojan, Antiy recommends the following protective measures:

(1) Install terminal anti-virus software: It is recommended to use host anti-virus and protection products such as Antiy Intelligent Endpoint Protection System that use the AVL SDK engine. It is recommended that users of Antiy IEP enable the ransomware defense tool module (enabled by default).

(2) Enhance password strength: Avoid using weak passwords. It is recommended to use 16-character or longer passwords, including combinations of uppercase and lowercase letters, numbers, and symbols. At the same time, avoid using the same password on multiple servers.

(3) Regularly change passwords: Change system passwords regularly to avoid password leaks that may lead to system intrusions;

(4) Timely update patches: It is recommended to enable the automatic update function to install system patches. System patches should be updated in a timely manner for vulnerable parts such as servers, databases, and middleware.

(5) Close high-risk ports: Adopt the minimization principle to external services and close unused high-risk ports such as 3389, 445, 139, and 135.

(6) Email Security: Handle suspicious emails carefully to avoid downloading unknown attachments or clicking on unfamiliar links.

(7) Disable PowerShell: If you are not using the PowerShell command-line tool, it is recommended to disable it.

(8) Regular data backup: Regularly back up important files, and the backed-up data should be isolated from the host.

Antiy Emergency Response Service

Antiy continuously empowers users to build an effective network attack security protection system and achieve effective security value.

National service hotline: 400-840-9234

Service support email: support@antiy.cn

Be Vigilant Against New Threats, Fortify Data Defenses!

Appendix: Introduction to Antiy AVL SDK Anti-Virus Engine

Antiy AVL SDK anti-virus engine is a threat detection capability middleware developed by Antiy for all architectures and system platforms. By embedding the AVL SDK, Antiy products and ecosystem partners’ products can acquire virus and malware detection capabilities, and receive continuous updates through the virus database.

For eight malware categories including infectious viruses, worms, Trojans, hacking tools, gray software, risky software, junk files, and test files, it accurately identifies and detects over 50,000 families and 18 million malware variants. The detection capability fully covers all known malwares and strictly adheres to the CARO convention. The output is structured and named in sections by classification, environment, and family, and based on the behavioral capabilities of malicious samples, it outputs nearly a hundred types of malicious behavior tags for typical malicious behaviors such as encryption ransomware, data theft, remote control, botnet programs, and mining. Antiy Engine can recognize over 300 file formats and conduct in-depth preprocessing on compilable executable formats such as PE and ELF. It also performs recursive unpacking of various packages (including self-extracting archives), and conduct structural analysis of compound documents such as OFFICE and ACAD files that may contain embedded scripts or vulnerability-prone formats. This ensures high robustness against malware. Antiy Engine also comes with a trusted file signature library, supporting the product to implement security policies based on blacklist and whitelist controls, significantly enhancing the difficulty for attackers.

Antiy’s detection capabilities can be fully deployed locally. Antiy automatically analyzes and processes over 2 million new file objects on average every day and releases a virus database update every two hours. It also provides support services such as cloud detection, cloud analysis, and computer virus encyclopedia.

Antiy AVL SDK is available in various versions such as traditional PC hosts, smart terminals, network traffic, IT application innovation systems, industrial systems, and unmanned systems. It provides threat detection capabilities for scenarios including host system and workload security, network traffic security, business flow security, email and file service security, etc. It fully supports various architectures such as X86, ARM, MIPS (including Cavium), RISC, and PowerPC, supports a variety of mainstream operating systems including domestic operating systems, Linux, and Windows, as well as real-time industrial operating systems like Vxwork. It also supports high-speed detection in backbone network scenarios.

Antiy AVL SDK empowers over 100 industry partners. In addition to Antiy’s own product deployment, Antiy Engine has cumulatively covered more than 4 billion nodes (including mobile terminals, secure and controllable PC endpoints, cloud-native nodes, network devices, network security devices, etc.), providing inherent security detection capabilities for mobile phones and smart terminals. The main partners using Antiy Engine include mobile phone enterprises such as Huawei, Xiaomi, Honor, VIVO and OPPO, large Internet enterprises such as Ant Financial, and several listed cybersecurity companies. Partner products using Antiy Engine have won internationally renowned evaluation awards such as AV-TEST and NSS Labs. The “L Tomahawk” logo of AVL SDK has become a symbol of reliable anti-virus capabilities.

All of Antiy’s products, including but not limited to IEP security protection system product family, Unified Workload Protect, Persistent Threat Detection System (PTD), Persistent Threat Analysis System (PTA), Attack Capture System, Qingzhu Zhiyu WAF, etc., all use Antiy anti-virus engine.

The AVL SDK anti-virus engine has been under development since 2001 and has undergone significant version upgrades and iterations. It has successively received support from key national initiatives, including: the Ministry of Science and Technology’s Innovation Fund for Technology-based Firms (2004), the Ministry of Science and Technology’s National High-Tech R&D Program (863 Program) (2006), the National Development and Reform Commission’s Information Security Special Project (2008), and the Ministry of Industry and Information Technology’s Engineering Special Project (2019). The mobile version of AVL SDK won the 2014 AV-TEST Best Protection Award for Mobile Devices. Products powered by the AVL SDK, Antiy PTD and PTA, won first place in both the first and second National Cybersecurity Technology Challenge competitions hosted by the National Computer Network Emergency Response Technical Team/Coordination Center of China (CNCERT/CC).