How to remove Latrodectus malware from the operating system

What kind of malware is Latrodectus?

Latrodectus is a type of malware categorized as a loader. Loaders are a class of malicious software designed to infiltrate a target system and execute additional payloads. Once infiltrated, Latrodectus acts as a gateway for more harmful malware to be deployed onto the infected system, thereby exacerbating the potential damage and threat to the victim's privacy and security.

More about Latrodectus

Latrodectus, a loader malware, is capable of executing various types of malicious payloads, including ransomware, Remote Access Trojans (RATs), banking Trojans, information stealers, keyloggers, and other forms of malware. It is known that one of the payloads distributed via Latrodectus is a stealer called Lumma.

Ransomware encrypts data on the victim's system and demands payment for the decryption key, effectively barring users from accessing their own files until the ransom is paid. RATs grant cybercriminals access to infected systems, enabling them to remotely manipulate the victim's computer, pilfer sensitive information, or execute malicious actions without the user's awareness or consent.

Banking Trojans target sensitive financial information, including login credentials and credit card details, on victims' devices. Designed to steal such data, they pose a significant risk to users' financial security and privacy.

Information stealers are designed to clandestinely collect and exfiltrate sensitive information from infected systems, including login credentials, personal documents, and browsing history. They can compromise users' privacy and facilitate identity theft or other forms of cybercrime.

Keyloggers secretly record and log all keystrokes entered by the user, including usernames, passwords, and other sensitive information. They can covertly capture valuable data without the user's knowledge, posing a significant threat to privacy and security.

Conclusion

In conclusion, Latrodectus represents a significant threat as a loader malware capable of executing various types of malicious payloads. Its ability to infiltrate systems and deploy harmful malware underscores the importance of robust cybersecurity measures to mitigate its impact and protect against potential data breaches and privacy violations.

More examples of malware acting as a loader Ande Loader, PrivateLoader, and DBatLoader.

How did Latrodectus infiltrate my computer?

Latrodectus is commonly distributed through phishing emails, which deceive recipients into visiting websites hosting the malware. These emails often employ social engineering tactics to lure users into clicking on malicious links or downloading infected attachments.

One known example of how the malware is distributed involves a chain of interconnected steps. It starts with a website's contact form email containing a link leading to a counterfeit Azure login page. Once the page is accessed, a JavaScript (JS) file is automatically downloaded onto the user's device.

The JS file then retrieves an installer MSI, which, upon execution, implants a Latrodectus Dynamic Link Library (DLL) onto the system. This DLL is configured for persistence, ensuring its continued presence even after system reboots. Finally, the Latrodectus malware establishes communication with its command-and-control (C2) server, allowing malicious actors remote access to the infected device.

How to avoid installation of malware?

Exercise caution when dealing with unsolicited emails, particularly those containing suspicious links or attachments. Opt for official sources when downloading software and files, avoiding peer-to-peer networks, third-party downloaders, or unofficial websites.

Do not interact with pop-ups, ads, and links (or buttons) while visiting shady pages. Ensure that all your programs, including your operating system, are regularly updated. Additionally, maintain proactive protection by conducting routine malware scans using reliable antivirus software to detect and remove any threats.

If you believe that your computer is already infected, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Fake Azure site distributing Latrodectus loader:

Examples of spam emails spreading Latrodectus malware:

Sample 1:

Text presented within:

Subject: Submission Confirmation

 

Full Name: **********
Phone
Number: **********
Email: **********
Checkbox
List: **********

You are infringing on a copyright -protected images owned by our company (**********)

Take a look at this document with the URLs to our images you utilized at ********** and our previous publications to get the proof of our copyrights.

Download it and see for yourself:

-
I believe that you willfully infringed on our rights under 17 U.S.C. Section 101 et seq. and can be liable for statutory damages of up to $140,000 as set forth in Section 504 (c) (2) of the Digital Millennium Copyright Act (DMCA) therein.

This letter is official notification. I demand the elimination of the infringing materials described above. Take note as company, the Dmca requires you to and deactivate access to the copyrighted materials upon receipt of this notification letter. In case you do not cease the use of the aforementioned infringing materials a law suit will likely be commenced against you.

I have a strong self-belief that utilization of the copyrighted materials referenced above as presumably infringing is not permitted by the copyright owner, its agent, as well as legislation.

I swear, under consequence of perjury, that the informatino in this letter is correct and hereby affirm that I am permitted to act on behalf of the proprietor of an exclusive right that is presumably violated.

Best regards,
**********
Legal Officer
**********
**********
**********

02/21/2024

Sample 2:

Text presented within:

Subject: [EXTERNAL] Re: Scan Duplication Concerns

 

Last week your manager asked me to calculate and form a finalized estimate for a next month project.
Confirm it today please, I will be on vacation tomorrow:

**********

Please find link Docs

Update April 5, 2024 – Recent developments in the cybersecurity realm have unveiled notable shifts in the tactics surrounding the Latrodectus malware. Threat actors, recognized for their sophisticated methods, have begun impersonating various companies to disseminate legal threats regarding alleged copyright infringement.

Threat actors use personalized messages and unique URLs to deceive targets into downloading malicious JavaScript files. When executed, these files trigger a series of actions, including the deployment of Latrodectus through a simplified string decryption routine.

Update October 22, 2024 – Latrodectus developers have released multiple variants of this malware throughout 2024. The changes between the iterations were mostly rather minuscule, but there were instances of features being removed.

The haste with which these Latrodectus versions have been developed and their number suggest that new ones are likely to be forthcoming. Possibly, this activity is in anticipation of some significant change to the malware. More information on these developments can be found in an article by Albert Zsigovits on VMRay.

How to remove malware manually?

Most trojan infections can be removed by running a full system scan with Combo Cleaner. The full manual procedure below is for cases where automatic removal failed, where you want to verify a scan caught everything, or where the threat has multiple persistence points.

Tools you'll need

Combo Cleaner Antivirus 7-days free trial

Recommended primary scanner. VB100 certified. The 7-day free trial is available.

Microsoft Defender Offline Free · built-in

Built into Windows. Boots to a clean environment to catch rootkits.

Process Explorer Free

From Microsoft Sysinternals. Better than Task Manager - shows full paths and signatures.

Autoruns Free

From Microsoft Sysinternals. Lists every place malware can persist on your system.

Microsoft Safety Scanner (MSERT) Free

Official Microsoft on-demand scanner. Always-current signatures - expires every 10 days.

Phase 1~ 5 min

Contain - limit the damage

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1

Disconnect from the network

30 secNo tool needed

Unplug your Ethernet cable and turn off Wi-Fi. If you're on a laptop, the airplane-mode key works fastest.

Why this matters

Many trojans exfiltrate data - saved browser passwords, banking sessions, screenshots - and accept remote commands. Cutting the network stops both immediately. Keep it disconnected until Phase 4.

2

Boot into Safe Mode with Networking

3 min

Safe Mode loads a minimal set of drivers and stops most malware from auto-running. "With Networking" lets you download tools - re-enable Wi-Fi only after you've booted in.

Windows 11

Open Settings → System → Recovery. Click Restart now next to Advanced startup.

Your computer will restart into the "Choose an option" menu. Click Troubleshoot → Advanced options → Startup Settings → Restart. After the second reboot, press 5 or F5.

Windows 10

Click the Windows logo, hold Shift, click the Power icon and choose Restart. In the Choose an option screen, click Troubleshoot → Advanced options → Startup Settings → Restart. Press F5.

Windows 8

Go to the Start Screen, type Advanced, select Settings → Advanced startup options → Restart now → Troubleshoot → Advanced options → Startup settings → Restart → F5.

Note: Windows 8 reached end-of-life in January 2023 - running on it puts you at much higher risk of reinfection.

Windows 7

Click Start → Shut Down → Restart → OK. As the system boots, press F8 repeatedly until the Windows Advanced Options menu appears, then choose Safe Mode with Networking.

Note: Windows 7 reached end-of-life in January 2020 - running on it puts you at much higher risk of reinfection.

Phase 2~ 15 min

Identify - find what's hiding

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3

Inspect running processes with Process Explorer

Tool: Process Explorer5 min

Download Process Explorer from Microsoft Sysinternals. Run it as Administrator. Click Options → Verify Image Signatures and View → Lower Pane View → DLLs.

Sort by "Verified Signer." Anything unsigned running from %AppData%, %LocalAppData%, %Temp%, or %ProgramData% is suspicious. Right-click → Properties to see the full image path. Right-click → "Search Online" to look up unfamiliar process names.

Why not just Task Manager

Task Manager hides full file paths, doesn't show digital signatures, and groups processes in ways that make malware easy to miss. Process Explorer is the same tool Microsoft engineers use.

4

Map every persistence point with Autoruns

Tool: Autoruns 14.x10 min

Download Autoruns. Right-click Autoruns.exe and choose Run as administrator - without elevation, Autoruns can't inspect protected registry hives.

In the menu, open Options → Hide Microsoft Entries and Options → Hide Empty Locations, then click Refresh.

Modern trojans don't just live in startup. Walk through these tabs and look for unsigned or unfamiliar entries:

• Logon - classic Run/RunOnce keys
• Scheduled Tasks - frequent hiding spot, especially tasks with PowerShell, MSHTA, or rundll32 actions
• Services - unsigned services in non-Microsoft folders
• WMI - Event Subscriptions are a stealthy persistence mechanism (MITRE T1546.003)
• Image Hijacks - Image File Execution Options "Debugger" abuse
• AppInit - DLLs loaded into every GUI process
• Browser plug-ins - unsigned add-ons across all installed browsers

Pro tip

Right-click any suspicious entry → "Jump to Image" to see the actual file. Right-click → "Search Online" opens VirusTotal for the file hash. Don't delete yet - just write down the file paths and entry names. We'll remove them after the scans.

5

Check the hosts file and DNS settings

3 minBuilt into Windows

Trojans often redirect bank, antivirus, and update domains to attacker-controlled servers by editing the hosts file or DNS settings.

Hosts file: Open Notepad as Administrator and open C:\Windows\System32\drivers\etc\hosts. Legitimate entries are commented with #. Any uncommented IP-to-domain mapping is suspicious - especially redirects for microsoft.com, windowsupdate, or your bank.

DNS settings: Open Command Prompt as Administrator and run ipconfig /all. Confirm your DNS servers point to your ISP, your router, or a known public resolver (Cloudflare 1.1.1.1, Google 8.8.8.8). Then open Settings → Network & internet → [your adapter] → DNS server assignment and verify both DNS and DNS over HTTPS (DoH) settings haven't been hijacked.

Why this matters

A clean PC with hijacked DNS is still a compromised PC. You'll think you're at chase.com and you'll be at the attacker's clone.

Phase 3~ 60-90 min

Remove - three scans, one cleanup

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No single antivirus catches everything. The order below is intentional: offline scan first (catches rootkits before Windows fully loads), then on-demand scanners on the running system, then manual cleanup of anything they missed.

6

Run Microsoft Defender Offline

Tool: Built into Windows15 min

Reboot to normal Windows. Open Windows Security → Virus & threat protection → Scan options. Select Microsoft Defender Antivirus (offline scan) and click Scan now. Your computer will restart into a stripped-down environment and scan before the full operating system loads.

Why this comes first

Rootkits and bootkits hide from any scanner running on the same Windows session that's already infected. A pre-boot offline scan sees the disk before the malware can hide itself.

Recommended antivirus

Combo Cleaner

VB100 certified. Includes anti-trojan, registry/persistence scanning, anti-spyware in one pass. The 7-day free trial is available.

Download Combo Cleaner

7

Run Combo Cleaner full system scan

Tool: Combo Cleaner20-40 min

Install Combo Cleaner and run a full system scan (not the quick scan). Let it complete fully, review the detected threats, and apply the recommended actions. Combo Cleaner will quarantine known trojans and registry persistence.

8

Run Microsoft Safety Scanner as a second-opinion scan

Tool: Microsoft Safety Scanner15 min

Download Microsoft Safety Scanner (MSERT.exe), Microsoft's free on-demand tool. The binary expires every 10 days, which means every download has the latest signatures. Run a full scan after Combo Cleaner to catch anything one engine alone might miss.

Why a second scan

Different scanning engines catch different threats. Running an additional Microsoft scan after Combo Cleaner is the single most underused verification step in malware removal.

9

Manually remove anything still listed in Autoruns

Tool: Autoruns10 min

Reopen Autoruns. Anything you flagged in Step 4 that's still present hasn't been caught by the automated scans. For each remaining suspicious entry: right-click → Delete in Autoruns (this removes the persistence registration), then navigate to the file path and delete the actual file. Empty the Recycle Bin.

Important

Some malware files reappear after deletion because something else on the system recreates them. If you delete a file and it returns within minutes, you have a remaining persistence point that Autoruns didn't show - usually a service or scheduled task running under SYSTEM. Re-run the scans from Steps 6-8 or proceed to a clean install (see end of guide).

Phase 4~ 15 min

Recover - restore browsers and security

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10

Reset browsers and clear notification permissions

5 min

Trojans and adware frequently hijack browsers - change the default search engine, install rogue extensions, or grant themselves notification permissions to keep displaying scam pop-ups even after the malware is gone.

• Chrome: visit chrome://settings/reset and click "Restore settings to their original defaults." Then visit chrome://settings/content/notifications and remove any unfamiliar sites.
• Edge: visit edge://settings/reset. Then check edge://settings/content/notifications.
• Firefox: open about:support and click Refresh Firefox (Firefox uses "Refresh," not "Reset"). Then check Settings → Privacy & Security → Permissions → Notifications.

Review installed extensions in each browser and remove anything you don't recognize, especially extensions you didn't install yourself.

11

Re-enable Defender, Tamper Protection, and update everything

10 min

Many trojans disable security software. Open Windows Security → Virus & threat protection → Manage settings and confirm Real-time protection, Cloud-delivered protection, and Tamper Protection are all turned on. Tamper Protection prevents malware from disabling Defender silently.

Then run Windows Update (Settings → Windows Update → Check for updates) and update your browsers and applications. The infection vector that let the trojan in originally usually involves outdated software.

Phase 5~ 15 min + 7 days

Verify & secure

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12

Change passwords from a clean device

20 min⚠ Critical

If the trojan was an info-stealer (Lumma, RedLine, Vidar, and similar are extremely common), assume every password saved in your browser is compromised. Change them from a different, known-clean device - your phone is fine if it's not infected.

Recommended order:

1. Primary email first - it's the recovery hub for everything else
2. Banking and financial accounts
3. Password manager master password (if you use one)
4. Social media, shopping, and remaining accounts

Where available, enable phishing-resistant multi-factor authentication (passkeys / FIDO2 hardware keys / authenticator apps) - SMS-based MFA is bypassable by sophisticated attackers.

13

Verify the clean and monitor for 7 days

5 min + 1 week monitoring

Reconnect to the network and run one final full scan with Combo Cleaner. Open Task Manager (Ctrl + Shift + Esc) and switch to the Startup apps tab - confirm nothing suspicious has reappeared.

Over the next 7 days, watch for symptom recurrence: unexpected high CPU usage, unknown processes returning, browser redirects, or pop-ups. If anything returns, you missed a persistence point and the procedure needs to be repeated - or you may have a deeper compromise that requires a clean install.

When to clean install Windows instead

Manual removal isn't always the right answer. Reinstalling Windows from scratch is the only way to be 100% certain when:

• The malware reappears after every removal attempt
• A bootkit or UEFI rootkit was detected (this class of threat sits below the operating system and survives a normal Windows reinstall)
• A confirmed credential-theft trojan ran with administrator privileges (Lumma, RedLine, Vidar) - the system likely has multiple unknown payloads
• The PC is used for online banking, business email, or anything where partial doubt isn't acceptable

A clean install is a 30-60 minute process: Windows 11 reinstall via Settings → System → Recovery → Reset this PC → Remove everything → Cloud download. Back up documents to external storage first, scan the backup with Combo Cleaner before restoring it, and reinstall applications fresh - never restore them from a backup of the infected system.

Important: Manual removal requires advanced computer skills. If you're not confident identifying system files from malicious files, run an automated scan with Combo Cleaner and Windows Defender and stop there - that path catches the vast majority of consumer trojans without the risk of breaking Windows by deleting the wrong file.

Frequently Asked Questions (FAQ)

My computer is infected with Latrodectus malware, should I format my storage device to get rid of it?

Formatting your storage device may indeed remove the Latrodectus malware, but it is a drastic measure that will also erase all data on the device. Before resorting to formatting, you should consider less drastic options (such as using a security tool like Combo Cleaner) to remove the malware and preserve your data.

What are the biggest issues that malware can cause?

The consequences of malware infections vary depending on the type of malware involved. They can range from identity theft and financial losses to decreased computer performance and the risk of further infections. Additionally, malware may compromise sensitive data, disrupt system operations, and facilitate unauthorized access to personal or corporate networks.

What is the purpose of Latrodectus?

The purpose of Latrodectus, a loader malware, is to infiltrate target systems and execute additional malicious payloads. It acts as a gateway for deploying various types of malware, including ransomware, remote access trojans (RATs), banking trojans, information stealers, and keyloggers.

How did Latrodectus infiltrate my computer?

In one distribution chain, an email leads to a fake Azure login page, triggering the automatic download of a JavaScript file. This file retrieves an installer MSI, which implants a Latrodectus DLL onto the system, ensuring persistence. Latrodectus then communicates with its command-and-control server, granting remote access to the infected device.

Will Combo Cleaner protect me from malware?

While Combo Cleaner is effective at detecting and removing most known malware infections, it is essential to acknowledge that advanced malware can lurk deeply within the system. Conducting a full system scan is imperative to ensure thorough detection and removal of any hidden threats.