“We assess that this activity was hyper-targeted given that there was a low volume of these documents in various malware repositories”, — say in Cisco Talos.
During malicious operations, cybercriminals used the following open source components:
To bypass detection, cybercriminals check whether programs like Process Explorer are running on the system that is under attack, and whether the infected computer is a virtual machine.
Read also: Researchers from Cisco Talos found vulnerability in DBMS SQLite
Among other things, the group has taken a number of additional steps in order to respond only to GET-requests that contain predefined fields, such as session cookies, a specific domain directory, etc. Transmitted data protected with the encryption.
“The actors’ preference for open-source solutions appears to be part of a broader trend in which adversaries are increasingly using publicly available solutions, possibly to improve operational security. These obfuscation techniques will require network defenders to modify their posture and procedures to detect this threat”, — consider researchers from Cisco Talos.
Infection of the system occurs by two vectors. The first involves use of a malicious Word document to download a remote template that exploits the memory impairment vulnerability in Microsoft Office (CVE-2017-11882) to execute code.
The second attack vector also involves the use of a malicious Word document. When the victim opens the document, it is required to activate the macros, and then the Visual Basic script starts running. This script scans system for the presence of tools for analyzing malware and stops work of the malware if it detects signs of a virtual machine.
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