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Cyber Threats
SILENT THREAT: RED TEAM TOOL EDRSILENCER DISRUPTING ENDPOINT SECURITY SOLUTIONS
Trend Micro's Threat Hunting Team discovered EDRSilencer, a red team tool that
threat actors are attempting to abuse for its ability to block EDR traffic and
conceal malicious activity.
By: Jacob Santos, Cj Arsley Mateo, Sarah Pearl Camiling October 15, 2024 Read
time: 7 min (1847 words)
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--------------------------------------------------------------------------------
SUMMARY
* The Trend Micro Threat Hunting Team recently discovered EDRSilencer, a red
team tool originally designed to interfere with endpoint detection and
response solutions via the Windows Filtering Platform.
* However, our internal telemetry showed threat actors attempting to integrate
EDRSilencer in their attacks, repurposing it as a means of evading detection.
* EDRSilencer disrupts the transmission of telemetry or alerts to EDR
management consoles, which complicates the identification and removal of
malware.
* The tool dynamically identifies any running EDR processes and creates WFP
filters to block their outbound communication.
* During testing, it was also found to block communication for processes not
included in its hardcoded list, further demonstrating its effectiveness.
Red team tools, which identify and address weaknesses in an organization’s
security infrastructure, are crucial to the improvement of its overall security
posture. However, threat actors are continuously finding ways to repurpose these
tools for malicious purposes. Recently, the Trend Micro Threat Hunting Team
discovered EDRSilencer, a red team tool that is able to interfere with endpoint
detection and response (EDR) solutions by leveraging the Windows Filtering
Platform (WFP). According to the author of this tool, it was inspired by the
closed-source tool FireBlock by MdSec NightHawk.
EDRs are security tools that monitor endpoints like computers for signs of
malicious activity. EDRSilencer is designed to block network communication for
processes associated with various EDR products. This interference can prevent
EDR solutions from sending telemetry or alerts to their management consoles,
making it significantly harder to identify and remove malware. It is effective
in blocking network communication for processes associated with various EDR
products (Table 1).
The WFP is a powerful framework built into Windows for creating network
filtering and security applications. It provides APIs for developers to define
custom rules to monitor, block, or modify network traffic based on various
criteria, such as IP addresses, ports, protocols, and applications. WFP is used
in firewalls, antivirus software, and other security solutions to protect
systems and networks.
However, this tool demonstrates a technique that can be used by adversaries to
evade detection: By blocking EDR traffic, malware could potentially remain
hidden on a system, making it harder to identify and remove. Understanding how
this code works is crucial for defenders to develop effective countermeasures.
EDR Product Process Carbon Black Cloud RepMgr.exe, RepUtils.exe, RepUx.exe,
RepWAV.exe, RepWSC.exe Carbon Black EDR cb.exe Cisco Secure Endpoint (Formerly
Cisco AMP) sfc.exe Cybereason AmSvc.exe, CrAmTray.exe, CrsSvc.exe,
ExecutionPreventionSvc.exe, CybereasonAV.exe Cylance CylanceSvc.exe Elastic EDR
winlogbeat.exe, elastic-agent.exe, elastic-endpoint.exe, filebeat.exe ESET
Inspect EIConnector.exe, ekrn.exe FortiEDR fortiedr.exe Harfanglab EDR
hurukai.exe Microsoft Defender for Endpoint and Microsoft Defender Antivirus
MsMpEng.exe, MsSense.exe, SenseIR.exe, SenseNdr.exe, SenseCncProxy.exe,
SenseSampleUploader.exe Palo Alto Networks Traps/Cortex XDR Traps.exe,
cyserver.exe, CyveraService.exe, CyvrFsFlt.exe Qualys EDR QualysAgent.exe
SentinelOne SentinelAgent.exe, SentinelAgentWorker.exe, SentinelServiceHost.exe,
SentinelStaticEngine.exe, LogProcessorService.exe,
SentinelStaticEngineScanner.exe, SentinelHelperService.exe,
SentinelBrowserNativeHost.exe Tanium TaniumClient.exe, TaniumCX.exe,
TaniumDetectEngine.exe Trellix EDR xagt.exe TrendMicro Apex One CETASvc.exe,
WSCommunicator.exe, EndpointBasecamp.exe, TmListen.exe, Ntrtscan.exe,
TmWSCSvc.exe, PccNTMon.exe, TMBMSRV.exe, CNTAoSMgr.exe, TmCCSF.exe
Table 1. List of executable names associated with common EDR products terminated
by EDRSilencer
The code leverages WFP by dynamically identifying running EDR processes and
creating WFP filters (Figure 1) to block their outbound network communications
on both the internet protocols IPv4 and IPv6, effectively preventing EDRs from
sending telemetry or alerts to their management consoles (Figure 2).
To verify whether the EDR was effectively blocked by EDRSilencer, we utilized
EDRNoiseMaker, a tool available on GitHub that is designed to identify potential
silencers of an EDR or a process of the user's choosing (Figure 4). It tries to
detect the silenced processes by examining a list of executables that have been
silenced using WFP, which corresponds directly to the functionality of
EDRSilencer.
Figure 1. EDRSilencer configures a WFP filter to block specific application
connections and sets up the corresponding provider
Figure 2. EDRSilencer adds filters to both IPv4 and IPv6 layers
The WFP filters are marked as persistent, ensuring that they remain active even
after the code has finished executing or the system is rebooted.
The tool provides a command-line interface with the following options:
* blockedr - Automatically block traffic from all detected EDR processes
* block <path> - Block traffic from a specific process specified by its full
path
* unblockall - Remove all WFP filters created by the tool
* unblock <filter id> - Remove a specific WFP filter using its ID
During our investigation, we tested the tool with our Vision One Endpoint Agent.
On the first attempt using the tool with the blockedr argument, the endpoint
agent was still able to send outbound traffic, as some executable files
reporting to Vision One are not included in the hardcoded list.
Figure 3. Log shows a list of processes that have been found running related to
EDR or antivirus products
Figure 4. Using EDRNoiseMaker to confirm that rules have been made. This will
show the ID and the path of executables that were blocked with custom outbound
filter.
Figure 5. Although the processes have been blocked, the EDR is still able to
send telemetry based on the endpoint logs
On the second attempt, we first checked for running Trend Micro products, saw
two processes running that were not included in the hardcoded list (Figure 6)
and copied their respective full file paths. We then used both blockedr and
block <path> arguments to apply the filters (Figure 7). When we executed a
ransomware binary, no logs were reflected on the portal; the device appeared
disconnected or inactive, which indicates that the tool was effective (Figure
9). By utilizing the same command line for blockedr as shown in Figure 5, along
with the block <path> command illustrated in Figure 8, EDRSilencer successfully
blocked the logs from the endpoint.
Figure 6. Task Manager showing other Trend Micro processes like Trend Micro
Response Service and Trend Micro Cloud Endpoint Service, which are not included
in the hardcoded list
Figure 7. Blocking processes using the complete path of binary of EDR or
antivirus
Figure 8. Vision One Search Platform showing that there are no new logs
indicating ransomware activity from the endpoint after using blockedr and block
<path> argument
Figure 9. The device was disconnected or inactive, which indicates that
EDRSilencer is effective
ATTACK CHAIN
As shown in Figure 10, EDRSilencer is executed as follows:
Process Discovery
The attack chain begins with the process discovery phase, where EDRSilencer
scans the system to compile a list of running processes associated with common
EDR products.
Execution
In the execution phase, the attacker runs EDRSilencer using
the blockedr argument to block traffic from all detected EDR processes.
Alternatively, the attacker can use the block <path> argument to block traffic
from a specific process by providing its full path.
Privilege Escalation
Moving to privilege escalation, EDRSilencer configures WFP filters to block
outbound network communications for both IPv4 and IPv6 protocols. These filters
are marked as persistent, ensuring they remain effective even after the system
reboots. The tool dynamically identifies running EDR processes and applies WFP
filters to block their communications.
Impact
Finally, EDR tools are rendered ineffective as they are unable to send
telemetry, alerts, or other data to their management consoles. During testing,
it was observed that some EDR processes were still able to communicate because
they were not included in the hardcoded list. After identifying and blocking
additional processes not included in the hardcoded list, the EDR tools failed to
send logs, confirming the tool’s effectiveness. This allows malware or other
malicious activities to remain undetected, increasing the potential for
successful attacks without detection or intervention.
Figure 10. Attack chain of EDRSilencer
CONCLUSION
In our ongoing efforts to monitor and mitigate emerging threats, we have
observed based on our internal telemetry that certain threat actors are
attempting to leverage EDRSilencer as part of their attack strategies. This
highlights the ongoing trend of threat actors seeking more effective tools for
their attacks, especially those designed to disable antivirus and EDR solutions.
The emergence of EDRSilencer as a means of evading endpoint detection and
response systems marks a significant shift in the tactics employed by threat
actors. By disabling critical security communications, it enhances the stealth
of malicious activities, increasing the potential for successful ransomware
attacks and operational disruptions. This is indicative of an evolving threat
landscape that necessitates a proactive and adaptive security posture, combining
multi-layered defenses and continuous monitoring to mitigate risks.
Organizations must remain vigilant, employing advanced detection mechanisms and
threat hunting strategies to counteract these sophisticated tools and protect
their digital assets. As threat actors continue to innovate, Trend Micro
persists in its commitment to enhancing security measures and sharing insights
to safeguard against future attacks.
SECURITY RECOMMENDATIONS
Trend Micro products already detect this tool as malware. As an additional layer
of protection, Behavior Monitoring (AEGIS) also flags this malware’s behavior
and prevents its execution for Trend Micro products that have this advanced
detection feature enabled.
We have also developed a suite of proactive detection strategies and solutions
that security practitioners can apply to identify and neutralize this threat
before it can be fully deployed and exploited by threat actors:
* Implementing multi-layered security controls
* Network segmentation - Isolate critical systems and sensitive data to limit
lateral movement
* Defense-in-depth - Use multiple layers of security controls (including
firewalls, intrusion detection systems, antivirus, and EDR) to create
redundancy.
* Enhancing endpoint security
* Behavioral analysis - Deploy security solutions that use behavioral
analysis and anomaly detection to identify unusual activities that might
bypass traditional EDR
* Application whitelisting - Only allow approved applications to run,
reducing the risk of malicious software execution.
* Conducting continuous monitoring and threat hunting
* Threat hunting - Proactively search for indicators of compromise (IoCs) and
advanced persistent threats (APTs) within your network.
* Implementing strong access controls
* Principle of least privilege - Ensure users and applications have the
minimum level of access necessary to perform their functions.
TREND MICRO VISION ONE THREAT INTELLIGENCE
To stay ahead of evolving threats, Trend Micro customers can access a range of
Intelligence Reports and Threat Insights within Trend Micro Vision One. Threat
Insights helps customers stay ahead of cyber threats before they happen and be
better prepared for emerging threats. It offers comprehensive information on
threat actors, their malicious activities, and the techniques they use. By
leveraging this intelligence, customers can take proactive steps to protect
their environments, mitigate risks, and respond effectively to threats.
Trend Micro Vision One Intelligence Reports App [IOC Sweeping]
EDRSilencer Compromising Endpoint Security Monitoring
Trend Micro Vision One Threat Insights App
Emerging Threats: EDRSilencer Compromising Endpoint Security Monitoring
HUNTING QUERIES
Trend Micro Vision One Search App
Trend Micro Vision Once Customers can use the Search App to match or hunt the
malicious indicators mentioned in this blog post with data in their
environment.
Detecting potential incidents involving EDRSilencer
malName:*Win64.EDRSilencer* AND eventName:MALWARE_DETECTION
More hunting queries are available for Vision One customers with Threat Insights
Entitlement enabled.
MITRE ATT&CK TACTICS AND TECHNIQUES
Tactic Technique MITRE ID Discovery Process Discovery T1057 Execution Command
and Scripting Interpreter T1059 Privilege Escalation Create or Modify System
Process T1543.00 Defense Evasion Impair Defenses: Disable or Modify Tools
T1562.001 Network Traffic Filtering T1569.002 Impact Network Denial of Service
T1498 Endpoint Denial of Service T1499
INDICATORS OF COMPROMISE (IOCS)
SHA256 Detection
721af117726af1385c08cc6f49a801f3cf3f057d9fd26fcec2749455567888e7
HackTool.Win64.EDRSilencer.REDT
Tags
Articles, News, Reports | Cyber Threats | Research
AUTHORS
* Jacob Santos
Threat Analyst
* Cj Arsley Mateo
Threat Analyst
* Sarah Pearl Camiling
Threat Hunter
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word word word word word word word word word word word word word word word word
word word word word word word word word word word word word word word word word
word word word word word word word word
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