Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Comments
How to Identify Cobalt Strike on Your Network
Newest First  |  Oldest First  |  Threaded View
SamlServicesUser
50%
50%
SamlServicesUser,
User Rank: Apprentice
11/19/2020 | 6:04:46 PM
Great first steps but missing major vector
While I find this article well written, and certainly helpful to a blue team trying to understand Cobalt Strike beacons better, it neglects to mention the beacon's most useful evasion listener technique; DNS. While the article focuses on TCP and HTTP traffic, which is certainly loud on the network, beacons using DNS over UDP are far more useful to attackers. Take for example a payload ran on a domain-joined Windows server with all inbound an outbound network traffic blocked, outside of the required communication with its domain controller. In this scenario, direct TCP and HTTP shells, reverse and bind, are impossible to access, even if the attacker is on the same network. However, if that payload is a Cobalt Strike's DNS beacon, that isolated domain-joined device will find its communication with its domain controller weaponized as DNS lookups are sent to the attacker, remote on the internet, to establish the C2 channel for command execution and data exhilaration. How that works is beyond the scope of this comment, but I assure you, as someone who uses these a lot, they are highly efficient in evasion and never fail to shock the most capable of blue teams.
jamesdeluk
50%
50%
jamesdeluk,
User Rank: Apprentice
11/18/2020 | 6:26:16 PM
Images
Isn't this post missing some images?


Commentary
Ransomware Is Not the Problem
Adam Shostack, Consultant, Entrepreneur, Technologist, Game Designer,  6/9/2021
Edge-DRsplash-11-edge-ask-the-experts
How Can I Test the Security of My Home-Office Employees' Routers?
John Bock, Senior Research Scientist,  6/7/2021
News
New Ransomware Group Claiming Connection to REvil Gang Surfaces
Jai Vijayan, Contributing Writer,  6/10/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win an Amazon Gift Card! Click Here
Latest Comment: Zero Trust doesn't have to break your budget!
Current Issue
The State of Cybersecurity Incident Response
In this report learn how enterprises are building their incident response teams and processes, how they research potential compromises, how they respond to new breaches, and what tools and processes they use to remediate problems and improve their cyber defenses for the future.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-27610
PUBLISHED: 2021-06-16
SAP NetWeaver ABAP Server and ABAP Platform, versions - 700, 701, 702, 731, 740, 750, 751, 752, 753, 754, 755, 804, does not create information about internal and external RFC user in consistent and distinguished format, which could lead to improper authentication and may be exploited by malicious u...
CVE-2021-34801
PUBLISHED: 2021-06-16
Valine 1.4.14 allows remote attackers to cause a denial of service (application outage) by supplying a ua (aka User-Agent) value that only specifies the product and version.
CVE-2021-34803
PUBLISHED: 2021-06-16
TeamViewer before 14.7.48644 on Windows loads untrusted DLLs in certain situations.
CVE-2020-8299
PUBLISHED: 2021-06-16
Citrix ADC and Citrix/NetScaler Gateway 13.0 before 13.0-76.29, 12.1-61.18, 11.1-65.20, Citrix ADC 12.1-FIPS before 12.1-55.238, and Citrix SD-WAN WANOP Edition before 11.4.0, 11.3.2, 11.3.1a, 11.2.3a, 11.1.2c, 10.2.9a suffers from uncontrolled resource consumption by way of a network-based denial-o...
CVE-2020-8300
PUBLISHED: 2021-06-16
Citrix ADC and Citrix/NetScaler Gateway before 13.0-82.41, 12.1-62.23, 11.1-65.20 and Citrix ADC 12.1-FIPS before 12.1-55.238 suffer from improper access control allowing SAML authentication hijack through a phishing attack to steal a valid user session. Note that Citrix ADC or Citrix Gateway must b...