How to avoid installation of FormBook via fake Interhydro email?

Also Known As: FormBook virus
Type: Trojan
Damage level: Severe

What is Interhydro email virus?

When cybercriminals use emails to deliver malware, they send malicious attachments or website links. Their main goal is to trick recipients into opening a file designed to install malicious software. Cybercriminals behind this email are pretending to be Interhydro (a legitimate French company). They use this email to deliver FormBook malware.

Interhydro email virus malware-spreading email spam campaign

Interhydro email virus in detail

Cybercriminals behind this email attempt to trick recipients into believing that the file attached to it ("Proforma invoice.doc") is a proforma invoice and a packing list. Once opened, that document asks for permission to enable editing (macros commands). It installs FormBook after enabling macros commands in it.

FormBook can collect clipboard data, visited websites, take screenshots, extract saved login credentials (usernames. passwords, etc.), record keystrokes/keyboard input. Also, it can execute commands, download and execute files and perform other tasks that could cause the installation of other malware (for example, ransomware).

Threat Summary:
Name FormBook virus
Threat Type Trojan, password-stealing virus, banking malware, spyware.
Hoax Email has a proforma invoice from Interhydro company attached to it
Attachment(s) Proforma invoice.doc (its name may vary)
Detection Names Avast (RTF:Obfuscated-gen [Trj]), Combo Cleaner (Trojan.Exploit.MSOfficeWord.GenericKD.46912504), ESET-NOD32 (A Variant Of Generik.BRKWYQX), Kaspersky (UDS:DangerousObject.Multi.Generic), Microsoft (Exploit:O97M/CVE-2017-11882.BKQT!MTB), Full List Of Detections (VirusTotal)
Symptoms Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine.
Payload FormBook
Distribution methods Infected email attachments, malicious online advertisements, social engineering, software 'cracks'.
Damage Stolen passwords and banking information, identity theft, the victim's computer added to a botnet.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
▼ Download Combo Cleaner
To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

Malicious emails in general

Most cybercriminals disguise malicious emails as important, official documents from legitimate companies (in this case, Interhydro). Recipients install malware after opening malicious attachments (or files downloaded via provided links). More examples of malspam campaigns are "Taxve Inc.", "UAT Feedback", and "Assurance Certificates".

How did "Interhydro email virus" infect my computer?

This email has the "Proforma invoice.doc" file (its name may vary) attached to it. That attachment installs malware after opening it and enabling macros commands (editing/content). Other malicious emails can be used to deliver malware via Microsoft Excel or PDF documents, executable files, JavaScript files, archive files, etc.

Microsoft Office 2010 and newer versions have the Protected View mode - they do not allow malicious documents to infect computers without enabling macros commands. Older MS Office versions do not have the aforementioned mode. Thus, malicious documents opened with them infect computers automatically.

How to avoid installation of malware?

Attachments or links in irrelevant emails sent from unknown or suspicious addresses should not be opened - they could be malicious. Downloads from unreliable sources like unofficial pages, third-party downloaders, Peer-to-Peer networks should not be opened as well. Files and programs should be downloaded only from legitimate pages.

Installed programs have to be updated or activated with tools provided by their developers - most third-party tools are malicious. The operating system should have a reputable antivirus or anti-spyware software installed on it. The system should be scanned for malware on a regular basis.

If you've already opened "Interhydro email virus" attachment, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.

Appearance of the fake Interhydro email (GIF):

interhydro email virus email appearance in gif

Text presented in the fake Interhydro email:

Re: Revised offer with Proforma invoice and packing lists

Good day ,

I redid the documents as requested.

I divided them into 3 proforma.

One for each shipment. I think this is necessary for obtaining the 3 IDFs.

Remaining at your disposal for any further information

Best regards


Import-export sales administration


17 Professor Jean Bernard Street

Korner - BAT C - 2nd floor

69007 LYON, France

TEL: +33 (0) 4 78 33 09 09

FAX: +33 (0) 4 78 33 07 28

web:   www.interhydro.fr

Screenshot of the malicious attachment ("Proforma invoice.doc"):

interhydro email virus malicious document used for fomrbook malware delivery

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available.

Quick menu:

How to remove malware manually?

Manual malware removal is a complicated task - usually it is best to allow antivirus or anti-malware programs to do this automatically. To remove this malware we recommend using Combo Cleaner Antivirus for Windows.

If you wish to remove malware manually, the first step is to identify the name of the malware that you are trying to remove. Here is an example of a suspicious program running on a user's computer:

malicious process running on user's computer sample

If you checked the list of programs running on your computer, for example, using task manager, and identified a program that looks suspicious, you should continue with these steps:

manual malware removal step 1Download a program called Autoruns. This program shows auto-start applications, Registry, and file system locations:

screenshot of autoruns application

manual malware removal step 2Restart your computer into Safe Mode:

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button.

Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options".

In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

manual malware removal step 3Extract the downloaded archive and run the Autoruns.exe file.

extract autoruns.zip and run autoruns.exe

manual malware removal step 4In the Autoruns application, click "Options" at the top and uncheck "Hide Empty Locations" and "Hide Windows Entries" options. After this procedure, click the "Refresh" icon.

Click 'Options' at the top and uncheck 'Hide Empty Locations' and 'Hide Windows Entries' options

manual malware removal step 5Check the list provided by the Autoruns application and locate the malware file that you want to eliminate.

You should write down its full path and name. Note that some malware hides process names under legitimate Windows process names. At this stage, it is very important to avoid removing system files. After you locate the suspicious program you wish to remove, right click your mouse over its name and choose "Delete".

locate the malware file you want to remove

After removing the malware through the Autoruns application (this ensures that the malware will not run automatically on the next system startup), you should search for the malware name on your computer. Be sure to enable hidden files and folders before proceeding. If you find the filename of the malware, be sure to remove it.

searching for malware file on your computer

Reboot your computer in normal mode. Following these steps should remove any malware from your computer. Note that manual threat removal requires advanced computer skills. If you do not have these skills, leave malware removal to antivirus and anti-malware programs.

These steps might not work with advanced malware infections. As always it is best to prevent infection than try to remove malware later. To keep your computer safe, install the latest operating system updates and use antivirus software.

To be sure your computer is free of malware infections, we recommend scanning it with Combo Cleaner Antivirus for Windows.

Click to post a comment

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

About PCrisk

PCrisk logo

PCrisk is a cyber security portal, informing Internet users about the latest digital threats. Our content is provided by security experts and professional malware researchers. Read more about us.

Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
FormBook virus QR code
Scan this QR code to have an easy access removal guide of FormBook virus on your mobile device.
We Recommend:

Get rid of Windows malware infections today:

Download Combo Cleaner

Platform: Windows

Editors' Rating for Combo Cleaner:
Editors ratingOutstanding!

[Back to Top]

To use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available.