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LinkedIn Fake Jobs for Spear Phishing

Since the COVID pandemic, unemployment rates have risen dramatically. It is a perfect time to take advantage of job seekers who are desperate to find employment. Thus, a customized job lure is even more enticing during these troubled times. 

Hence, targeting such unsuspecting people to carry out Spear Phishing attacks on LinkedIn with fake job offers to infect them with a sophisticated BACKDOOR TROJAN - MORE_EGGS is the latest modus operendi. 

Crafting the fake job offer based on the the target’s job position from LinkedIn increases the odds that the recipient will successfully detonate the malware. To increase the odds of success, the phishing lures take advantage of malicious ZIP archive files that have the same name as that of the victims' job titles taken from their LinkedIn profiles.

For example, if the LinkedIn member's job is listed as Senior Account Executive—International Freight the malicious zip file would be titled Senior Account Executive—International Freight position (note the 'position' added to the end), cybersecurity firm eSentire's Threat Response Unit (TRU) said in an analysis. Upon opening the fake job offer, the victim unwittingly initiates the stealthy installation of the fileless backdoor, more_eggs. It uses normal Windows processes to run so it is not going to typically be picked up by anti-virus and automated security solutions so it is quite stealthy. 

The below three elements make more_eggs, and the cybercriminals which use this backdoor very lethal -

Once installed, more_eggs maintains a stealthy profile by hijacking legitimate Windows processes while presenting the decoy "employment application" document to distract targets from ongoing background tasks triggered by the malware. Furthermore, it can act as a conduit to retrieve additional payloads from an attacker-controlled server, such as banking trojans, ransomware, credential stealers, and even use the backdoor as a foothold in the victim's network so as to exfiltrate data.

Reference links: 

https://www.linkedin.com/posts/nsji_cybersecurity-security-privacy-activity-6785417730028908544-rXOe/

https://thehackernews.com/2021/04/hackers-targeting-professionals-with.html

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