Hackers target LinkedIn users with fake job offers to spread malware
The Golden Chicken group is selling the More_Eggs backdoor to other groups as a malware as a service (MaaS) model
These files are titled to mirror the exact job title. For example, a user listing ‘Senior Account Executive International Freight’ as their job will be sent a malicious .ZIP file titled ‘Senior Account Executive - International Freight position’.
Once opened, victims initiate the stealthy installation of the More_eggs backdoor that can download additional malicious plugins and provide remote access to their device.
Golden Chicken sell the backdoor under a malware as a service (MaaS) arrangement to other cyber criminals, made possible by More_Eggs’ tendency to maintain a stealthy profile by abusing legitimate Windows processes.
Researchers with eSentire disrupted an active spear phishing incident in which a health tech professional downloaded and executed a malicious .ZIP file.
Taking a proactive approach to cyber security
A complete guide to penetration testingDownload now
The researchers saw the victim unwittingly activate VenomLNK, an initial stage of More_Eggs that abused Windows Management Instrumentation to enable the plugin loader, TerraLoader. This, in turn, hijacks the cmstp and regsvr32 processes.
While TerraLoader is being initiated, a decoy Word document is presented to the victim to impersonate a job application but serves no functional purpose in the infection. This is simply a decoy that distracts the user from the background tasks of More_Eggs.
TerraLoader then installs msxsl in the user’s roaming profile and loads the payload, before signalling to a command and control (C&C) server through the copy of msxsl. This beacon then communicates that the More_Eggs backdoor is ready for Golden Chicken’s customer to log in and begin carrying out their goal.
Possibilities, depending on the group that More_Eggs is sold to on the MaaS model, include infecting with additional malware strains, such as ransomware, or getting a foothold into the victim’s network to exfiltrate data.
The eSentire researchers have so far been unable to determine what the ultimate purposes of this campaign might be, although it mirrors a similar campaign reported in February 2019 which also involved the More_Eggs backdoor.
How to choose an AI vendor
Five key things to look for in an AI vendorDownload now
The UK 2020 Databerg report
Cloud adoption trends in the UK and recommendations for cloud migrationDownload now
2021 state of email security report: Ransomware on the rise
Securing the enterprise in the COVID worldDownload now
The impact of AWS in the UK
How AWS is powering Britain's fastest-growing companiesDownload now