Presented at
RVAsec 2017,
June 8, 2017, 2 p.m.
(50 minutes).
PowerShell is increasingly being used by advanced attackers and script kiddies alike in targeted attacks, commodity malware, and even ransomware. The most common usage involves PowerShell remotely downloading and running payloads entirely in memory, rendering many traditional detection mechanisms useless.
Detection has increasingly shifted to monitoring for this malicious activity via process command line arguments and parent-child process relationships. While this is a significant improvement there are numerous evasion techniques of which the Red Team and Blue Team should be aware.
For the past 1.5 years I have researched PowerShell obfuscation, evasion and advanced detection techniques. Picking up from where I left off in my recent presentations on Invoke-Obfuscation, in this presentation I will highlight my new tool Invoke-CradleCrafter. Additionally, I will introduce a new family of PowerShell obfuscation techniques and show how they can be applied to several new and obscure families of remote download cradles.
Presenters:
-
Daniel Bohannon / DBO
- MANDIANT, A FireEye Company
as Daniel Bohannon
Daniel Bohannon is a Senior Incident Response Consultant at MANDIANT with over six years of operations and information security experience. His particular areas of expertise include enterprise-wide incident response investigations, host-based security monitoring, data aggregation and anomaly detection, and PowerShell-based attack research and detection techniques.
As an incident response consultant, Mr. Bohannon provides emergency services to clients when security breaches occur. He also develops new methods for detecting malicious PowerShell usage at both the host- and network-level while researching obfuscation techniques for PowerShell-based attacks that are being used by numerous threat groups.
Prior to joining MANDIANT, Mr. Bohannon spent five years working in IT operations and then leading the incident response team for an organization in the private retail industry.
Mr. Bohannon received a Master of Science in Information Security from the Georgia Institute of Technology and a Bachelor of Science in Computer Science from The University of Georgia.
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