A new type of spam campaign is used by cybercriminals to deliver the malware named SmokeLoader
One of the most prolific methods of malware distribution is through email spam campaigns. This type of emails is getting more and more ingenious and well crafted because cybercriminals need the user to trust them for an attack to succeed.
Our cybersecurity team is investigating a new malicious spam campaign that is used to distribute SmokeLoader malware. SmokeLoader is a Trojan downloader malware that is used for downloading and installing other malware on the victims’ device.
The email used in this campaign is named Website Job application in which is attached a password-protected zip file.
The zip password is displayed cleverly in the email content. This kind of trick gives the cybercriminals two advantages: first, it makes the email looks more legitimate, and it makes difficult for the email protection security systems to scan the attached files.
After the victim downloads the infected zip file and enters the password provided inside of the email a doc named resume.doc will be extracted. Once open this file will ask for permissions to enable macros, after allowing this option to a malicious macro is run in the background that will lunch the PowerShell script which will connect to the cybercriminals host and download the payload into the computer. The file which is stored into the cybercriminals host is named poop.jpg; after the download, it will end dropping into the victim’s system under the name DKSPKD.exe in %Temp% location.
During tests, our team observed that any Windows 8 running systems could be infected flawlessly with this payload which delivers other payloads after its install, not before disabling other protection systems that are present into an infected device.
The best protection for this kind of threat is never to open any emails, or files that they contain especially those that demand macros to be enabled, received from untrusted sources. For even better security is recommended for every system to have installed on them the top antivirus solutions that are always updated frequently.
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