The Delf Trojan is a dangerous weapon used against computer users worldwide. It infects mainly via infected software installers. Our article gives an overview of its behavior according to the collected samples and available reports, also it may be helpful in attempting to remove the virus.
|Short Description||The Delf Trojan is a computer virus that is designed to silently infiltrate computer systems.|
|Symptoms||The victims may not experience any apparent symptoms of infection.|
|Distribution Method||Software Vulnerabilities, Freeware Installations, Bundled Packages, Scripts and others.|
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|User Experience||Join Our Forum to Discuss Delf Trojan.|
Delf Trojan – Distribution Methods
The Delf Trojan is a generic identifier of several related threats. All of them use similar behavior patterns and distribution techniques allowing it to gain access to the target systems. The attack campaigns that are used to carry this Trojan can use the most popular methods to infect victims:
- Email Phishing Tactics — The criminals can conduct campaigns that seek to coerce the recipients into thinking that they have received a legitimate email from a well-known service or company. They are modeled after the real notifications and might include stolen content. Whenever one of the elements is accessed by the victims the Trojan will be delivered. The samples can also be directly attached to the messages as well.
- Malicious Download Pages — The criminals can create fake download sites, landing pages and portals to spread the Trojan. Other elements that can lead to the malware infection are all forms of interactive content: pop-ups, banners, ads and etc.
- Malicious Documents — The criminals can embed the virus installation scripts in documents of all popular types: spreadsheets, presentations, text files and databases. They depend on the execution of the built-in macros which are programmed to execute the Delf Trojan as soon as permission is granted to run them. This is done by spawning a pop-up notification asking the users to enable them in order to “correctly view” the file.
- Virus Setup Files — The other possibility is to embed the necessary malicious code in application setup files. The hackers will take the real installers and modify them with the code which is released via the methods described in this articles. Take note that all of the popular software can be affected: system utilities, creativity suites, productivity and office apps and etc.
- File Sharing Networks — The use of networks like BitTorrent for spreading Trojan samples is one of the most effective infection mechanisms. They are widely used to spread both legitimate and pirate content.
- Browser Plugins — They are made compatible with most of the popular web browsers and can often be found on the relevant browser repositories. They are uploaded with fake user reviews and developer credentials and promise feature additions and performance optimizations. However once they are installed dangerous modifications will take place to the computers — both the virus will be delivered and the victims may be redirected to a hacker-controlled landing page every time they start the browser.
Depending on the exact hacker configuration various other methods can also be used to spread the Delf Trojan.
Delf Trojan – Detailed Description
All of the classified so far Delf Trojan variants follow a typical behavior pattern which is slightly changed between the different variants. The slight code changes are the primary signs for differentiating between them.
As soon as the Del Trojan infection is triggered it will deploy various files to the Windows system folder. A distinct characteristic is that one of the files is a legitimate copy of the Windows file to fool the system security scans into thinking that a legitimate operation is being done. By modifying the folder and configuration files the Delf Trojan will automatically be started once the computer is powered on. A distinct Windows Registry key will be created specifically for the Trojan service.
Some of the Delf Trojan samples are capable of hooking up to other processes and services, including Internet Explorer. This allow the virus to carry out code injection attacks — modifications of input/output data and reading of the user interaction in real-time. This gives the Delf Trojan the ability to spy on the activities in real-time and modify form data. Such actions are widely used when the victims access online banking systems. Transaction details are changed in real-time leading to funds transfer to hacker banking accounts without the users noticing.
The Trojan code can retrieve data from the compromised machines which can be categorized into two groups:
- Personal User Information — The engine can be configured to gather sensitive information about the victims which can be used for blackmail, identity theft and financial abuse crimes. This is done by instructing the Trojan to look for information such as their name, address, phone number, location and any stored username and password combinations.
- Machine Identification — A detailed report of the installed components is made. It includes information on the parts, user settings and operating system values. This is used to compute an unique machine ID that is assigned to each host.
By taking advantage of the extracted information the Delf Trojan can scan for any security software that can block or remove it. Their real-time engines can be bypassed if the latest signatures are not available. So far the samples indicate that this mechanism acts against the following programs:
360safe, duba, kaspersky, mcafee, nod32, rising, Symantec AntiVirus
The Delf Trojan is fully capable of modifying boot options and configuration files in order to automatically start itself when the computer is powered on. This may also render most manual removal guides non-working as access to the boot recovery menu can be disabled.
The main goal of this malware is to run the built-in Trojan module which establishes a secure connection to a hacker-controlled server. It allows the operators to take over control of the machines, steal files and spy the victims in real time. Several distinct commands have been identified in some of the samples: HEAD, POST, OPTIONS, TRACE, PUT and CONNECT. The security reports indicate that there are several scenarios that can be launched:
- Data Theft — The connections can be used to program files theft from the compromised networks and any accessible removable storage devices or network shares.
- DDoS Weapon — When a large number of compromised networks have been acquired they can be programmed to direct a concurrent attack on a given target. This can take down both companies and government agencies.
- Proxy Server — Other malicious infections are done by the hackers via network proxies. The infected machines serve as the proxies from which the crimes are done.
Some of the acquired Delf Trojan files can scan the contents of files which are analyzed for email addressees. They will be forwarded to a database from which phishing messages are sent. Captured samples of this type have been found to target the following data:
.adb, .dbx, .doc, .eml, .htm, .html, .mbx, .mdx, .msg, .nch, .not, .oft,
.rtf, .sht, .tbb, .tbi, .txt, .wab, .xls,. xml
The addresses will be discarded if the following keywords are identified:
.edu, .gov, .mil, abuse, adres, admin, anonymous, anti, anyone, aol, apache,
avp, berkeley, borlan, bsd, bug, certific, contact, cops, defend, echo, example,
fbi, fido, foo, google, gov, help, ibm.com, icrosof, info, npris, kaspersk,
kernel, linux, local, mcafee, microsof, mozilla, mydomai, nobody, nodomai,
norton, not, nothing, page, panda, pgp, policy, postmaster, privacy, random,
reply, report, ripe, root, samples, secur, sendmail, service, spam, submit, support,
symantec, user, virus, webmaster, webmin, webmist
Some of the example subject lines that carry the Delf Trojan code are the following:
- Crazy soccer fans
- My sister whores, sh[*]t i dont know
- My tricks for you
- Naked World Cup game set
- Please reply me Tomas
- Soccer fans killed five teens
Remove NtCrypt Crypter Completely
To remove Delf Trojan manually from your computer, follow the step-by-step removal tutorial written down below. In case this manual removal does not get rid of the miner malware completely, you should search for and remove any leftover items with an advanced anti-malware tool. Such software can keep your computer secure in the future.
- Guide 1: How to Remove Delf Trojan from Windows.
- Guide 2: Get rid of Delf Trojan on Mac OS X.
- Guide 3: Remove Delf Trojan in Google Chrome.
- Guide 4: Erase Delf Trojan from Mozilla Firefox.
- Guide 5: Uninstall Delf Trojan from Microsoft Edge.
- Guide 6: Remove Delf Trojan from Safari.
- Guide 7: Eliminate Delf Trojan from Internet Explorer.
- Guide 8: Disable Delf Trojan Push Notifications in Your Browsers.
How to Remove Delf Trojan from Windows.
Step 1: Boot Your PC In Safe Mode to isolate and remove Delf Trojan
Step 2: Uninstall Delf Trojan and related software from Windows
Here is a method in few easy steps that should be able to uninstall most programs. No matter if you are using Windows 10, 8, 7, Vista or XP, those steps will get the job done. Dragging the program or its folder to the recycle bin can be a very bad decision. If you do that, bits and pieces of the program are left behind, and that can lead to unstable work of your PC, errors with the file type associations and other unpleasant activities. The proper way to get a program off your computer is to Uninstall it.
Step 3: Clean any registries, created by Delf Trojan on your computer.
The usually targeted registries of Windows machines are the following:
You can access them by opening the Windows registry editor and deleting any values, created by Delf Trojan there. This can happen by following the steps underneath:
Get rid of Delf Trojan from Mac OS X.
Step 1: Uninstall Delf Trojan and remove related files and objects
1. Hit the ⇧+⌘+U keys to open Utilities. Another way is to click on “Go” and then click “Utilities”, like the image below shows:
- Go to Finder.
- In the search bar type the name of the app that you want to remove.
- Above the search bar change the two drop down menus to “System Files” and “Are Included” so that you can see all of the files associated with the application you want to remove. Bear in mind that some of the files may not be related to the app so be very careful which files you delete.
- If all of the files are related, hold the ⌘+A buttons to select them and then drive them to “Trash”.
In case you cannot remove Delf Trojan via Step 1 above:
In case you cannot find the virus files and objects in your Applications or other places we have shown above, you can manually look for them in the Libraries of your Mac. But before doing this, please read the disclaimer below:
You can repeat the same procedure with the following other Library directories:
Tip: ~ is there on purpose, because it leads to more LaunchAgents.
Step 2: Scan for and remove Delf Trojan files from your Mac
When you are facing problems on your Mac as a result of unwanted scripts and programs such as Delf Trojan, the recommended way of eliminating the threat is by using an anti-malware program. SpyHunter for Mac offers advanced security features along with other modules that will improve your Mac’s security and protect it in the future.
Remove Delf Trojan from Google Chrome.
Step 1: Start Google Chrome and open the drop menu
Step 2: Move the cursor over "Tools" and then from the extended menu choose "Extensions"
Step 3: From the opened "Extensions" menu locate the unwanted extension and click on its "Remove" button.
Step 4: After the extension is removed, restart Google Chrome by closing it from the red "X" button at the top right corner and start it again.
Erase Delf Trojan from Mozilla Firefox.
Step 1: Start Mozilla Firefox. Open the menu window
Step 2: Select the "Add-ons" icon from the menu.
Step 3: Select the unwanted extension and click "Remove"
Step 4: After the extension is removed, restart Mozilla Firefox by closing it from the red "X" button at the top right corner and start it again.
Uninstall Delf Trojan from Microsoft Edge.
Step 1: Start Edge browser.
Step 2: Open the drop menu by clicking on the icon at the top right corner.
Step 3: From the drop menu select "Extensions".
Step 4: Choose the suspected malicious extension you want to remove and then click on the gear icon.
Step 5: Remove the malicious extension by scrolling down and then clicking on Uninstall.
Remove Delf Trojan from Safari.
Step 1: Start the Safari app.
Step 2: After hovering your mouse cursor to the top of the screen, click on the Safari text to open its drop down menu.
Step 3: From the menu, click on "Preferences".
Step 4: After that, select the 'Extensions' Tab.
Step 5: Click once on the extension you want to remove.
Step 6: Click 'Uninstall'.
A pop-up window will appear asking for confirmation to uninstall the extension. Select 'Uninstall' again, and the Delf Trojan will be removed.
Eliminate Delf Trojan from Internet Explorer.
Step 1: Start Internet Explorer.
Step 2: Click on the gear icon labeled 'Tools' to open the drop menu and select 'Manage Add-ons'
Step 3: In the 'Manage Add-ons' window.
Step 4: Select the extension you want to remove and then click 'Disable'. A pop-up window will appear to inform you that you are about to disable the selected extension, and some more add-ons might be disabled as well. Leave all the boxes checked, and click 'Disable'.
Step 5: After the unwanted extension has been removed, restart Internet Explorer by closing it from the red 'X' button located at the top right corner and start it again.
Remove Push Notifications caused by Delf Trojan from Your Browsers.
Turn Off Push Notifications from Google Chrome
To disable any Push Notices from Google Chrome browser, please follow the steps below:
Step 1: Go to Settings in Chrome.
Step 2: In Settings, select “Advanced Settings”:
Step 3: Click “Content Settings”:
Step 4: Open “Notifications”:
Step 5: Click the three dots and choose Block, Edit or Remove options:
Remove Push Notifications on Firefox
Step 1: Go to Firefox Options.
Step 2: Go to “Settings”, type “notifications” in the search bar and click "Settings":
Step 3: Click “Remove” on any site you wish notifications gone and click “Save Changes”
Stop Push Notifications on Opera
Step 1: In Opera, press ALT+P to go to Settings
Step 2: In Setting search, type “Content” to go to Content Settings.
Step 3: Open Notifications:
Step 4: Do the same as you did with Google Chrome (explained below):
Eliminate Push Notifications on Safari
Step 1: Open Safari Preferences.
Step 2: Choose the domain from where you like push pop-ups gone and change to "Deny" from "Allow".