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Endpoint Denial of Service

Sub-techniques (4)

ID	Name
.001	OS Exhaustion Flood
.002	Service Exhaustion Flood
.003	Application Exhaustion Flood
.004	Application or System Exploitation

Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users. Endpoint DoS can be performed by exhausting the system resources those services are hosted on or exploiting the system to cause a persistent crash condition. Example services include websites, email services, DNS, and web-based applications. Adversaries have been observed conducting DoS attacks for political purposes(Citation: FireEye OpPoisonedHandover February 2016) and to support other malicious activities, including distraction(Citation: FSISAC FraudNetDoS September 2012), hacktivism, and extortion.(Citation: Symantec DDoS October 2014) An Endpoint DoS denies the availability of a service without saturating the network used to provide access to the service. Adversaries can target various layers of the application stack that is hosted on the system used to provide the service. These layers include the Operating Systems (OS), server applications such as web servers, DNS servers, databases, and the (typically web-based) applications that sit on top of them. Attacking each layer requires different techniques that take advantage of bottlenecks that are unique to the respective components. A DoS attack may be generated by a single system or multiple systems spread across the internet, which is commonly referred to as a distributed DoS (DDoS). To perform DoS attacks against endpoint resources, several aspects apply to multiple methods, including IP address spoofing and botnets. Adversaries may use the original IP address of an attacking system, or spoof the source IP address to make the attack traffic more difficult to trace back to the attacking system or to enable reflection. This can increase the difficulty defenders have in defending against the attack by reducing or eliminating the effectiveness of filtering by the source address on network defense devices. Botnets are commonly used to conduct DDoS attacks against networks and services. Large botnets can generate a significant amount of traffic from systems spread across the global internet. Adversaries may have the resources to build out and control their own botnet infrastructure or may rent time on an existing botnet to conduct an attack. In some of the worst cases for DDoS, so many systems are used to generate requests that each one only needs to send out a small amount of traffic to produce enough volume to exhaust the target's resources. In such circumstances, distinguishing DDoS traffic from legitimate clients becomes exceedingly difficult. Botnets have been used in some of the most high-profile DDoS attacks, such as the 2012 series of incidents that targeted major US banks.(Citation: USNYAG IranianBotnet March 2016) In cases where traffic manipulation is used, there may be points in the global network (such as high traffic gateway routers) where packets can be altered and cause legitimate clients to execute code that directs network packets toward a target in high volume. This type of capability was previously used for the purposes of web censorship where client HTTP traffic was modified to include a reference to JavaScript that generated the DDoS code to overwhelm target web servers.(Citation: ArsTechnica Great Firewall of China) For attacks attempting to saturate the providing network, see Network Denial of Service.

ID: T1499

Sub-techniques: .001 .002 .003 .004

Tactic(s): Impact

Platforms: Azure AD, Containers, Google Workspace, IaaS, Linux, macOS, Office 365, SaaS, Windows

Data Sources: Application Log: Application Log Content, Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow, Sensor Health: Host Status

Impact Type: Availability

Version: 1.1

Created: 18 Apr 2019

Last Modified: 12 Apr 2022

Name	Description
Procedure Examples
OnionDuke	OnionDuke has the capability to use a Denial of Service module.(Citation: ESET Dukes October 2019)
Sandworm Team	Sandworm Team temporarily disrupted service to Georgian government, non-government, and private sector websites after compromising a Georgian web hosting provider in 2019.(Citation: US District Court Indictment GRU Unit 74455 October 2020)
ZxShell	ZxShell has a feature to perform SYN flood attack on a host.(Citation: FireEye APT41 Aug 2019)(Citation: Talos ZxShell Oct 2014)

Mitigation	Description
Mitigations
Filter Network Traffic	Use network appliances to filter ingress or egress traffic and perform protocol-based filtering. Configure software on endpoints to filter network traffic.
Endpoint Denial of Service Mitigation	Leverage services provided by Content Delivery Networks (CDN) or providers specializing in DoS mitigations to filter traffic upstream from services.(Citation: CERT-EU DDoS March 2017) Filter boundary traffic by blocking source addresses sourcing the attack, blocking ports that are being targeted, or blocking protocols being used for transport. To defend against SYN floods, enable SYN Cookies.

Detection

Detection of Endpoint DoS can sometimes be achieved before the effect is sufficient to cause significant impact to the availability of the service, but such response time typically requires very aggressive monitoring and responsiveness. Typical network throughput monitoring tools such as netflow, SNMP, and custom scripts can be used to detect sudden increases in circuit utilization.(Citation: Cisco DoSdetectNetflow) Real-time, automated, and qualitative study of the network traffic can identify a sudden surge in one type of protocol can be used to detect an attack as it starts. In addition to network level detections, endpoint logging and instrumentation can be useful for detection. Attacks targeting web applications may generate logs in the web server, application server, and/or database server that can be used to identify the type of attack, possibly before the impact is felt. Externally monitor the availability of services that may be targeted by an Endpoint DoS.

References

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