T1090: Proxy

Framework: MITRE ATT&CK · Tactic: Command and Control · Total Cataloged Families: 20 · Observed Samples: 402 · Primary Threat Categories: Trojan · Ransomware · Rat

Operational Executive Summary

T1090 (Proxy) is classified under the Command and Control tactic within the MITRE ATT&CK framework. Communication channels and covert protocols utilized to maintain interactive control of compromised implants through legitimate web protocols, encrypted proxies, and DNS tunneling. In telemetry gathered across enterprise endpoints and the EMBER 2018 benchmark, this technique was weaponized across 20 distinct malware families, totaling over 402 validated samples.

Technical Anatomy & Adversary Tradecraft

Adversaries leverage Proxy to accomplish operational objectives while minimizing anomalous forensic footprints. When executing Proxy, malicious binaries commonly interact directly with low-level Windows APIs, kernel mode drivers, or native scripting interfaces to bypass traditional file-integrity monitors and static antivirus signatures.

In modern multi-stage campaigns, T1090 is frequently observed functioning as an intermediate bridge: initial access payloads (such as spearphishing loaders or exploit macros) execute Proxy to establish in-memory execution or persistence before staging secondary ransomware or data-exfiltration implants.

Authoritative MITRE ATT&CK Reference: View official technique documentation, sub-techniques, and adversary groups at https://attack.mitre.org/techniques/T1090/.

Detection Engineering & Threat Hunting

Detecting Proxy requires telemetry correlation across endpoint detection and response (EDR) agents, Sysmon event streams, and security information event management (SIEM) pipelines:

Process Creation & Lineage: Monitor parent-child process anomalies where unexpected parent binaries (e.g., Office executables, web browsers, or script hosts) spawn command shells or native Windows utilities.
API Hooking & Behavioral Telemetry: EDR platforms should flag rapid calls to memory allocation, process injection, or registry manipulation APIs originating from unbacked executable memory regions.
Network Anomaly Correlation: Cross-reference endpoint execution timestamps with external network socket establishment to identify anomalous beaconing or covert data staging.

SOC Containment & Hardening Guidance

To mitigate risks associated with T1090 (Proxy) across production infrastructure, security teams should implement the following defensive controls:

Attack Surface Reduction (ASR): Enforce strict application control policies (WDAC or AppLocker) to restrict execution to signed and verified corporate binaries.
Least Privilege & Credential Hygiene: Restrict local administrative privileges to prevent adversaries from tampering with defensive agents or escalating privileges.
Network Microsegmentation: Restrict lateral communication across endpoint VLANs to prevent wormable payloads from utilizing Proxy across adjacent network segments.

→ Incident Response Guidance: Read our Botnet Protection & Remediation

Cataloged Malware Families Utilizing T1090 (20 Families)

The following malware families in the SystemHelpDesk catalog have been verified utilizing T1090 (Proxy):

20 families

Family	Category	Sample Count	Technical Summary
tofsee	Spam Bot	`264`	Tofsee (also widely cataloged as Gheg, Backdoor.Win32.Tofsee, and Spambot.Tofsee) is an extraordinarily resilient and sophisticated multi-purpose modular trojan...
bunitu	Trojan	`49`	Bunitu (cataloged across security intelligence feeds under signatures including Trojan:Win32/Bunitu, Trojan.Win32.Bunitu, and Trojan.Bunitu) is a persistent pro...
pbot	Trojan	`22`	Pbot (tracked under signatures Backdoor:Win32/Pbot, Trojan:Win32/Pbot, and Win32/Pbot) is a modular Windows remote access backdoor and network proxy agent. Infi...
redirect	Browser Modifier	`16`	Redirect (classified in antimalware definitions under BrowserModifier:Win32/Redirect, Adware:Win32/Redirect, and Trojan.BrowserModifier.Redirect) is a deceptive...
prorat	Rat	`14`	ProRAT (historically one of the most famous and widely distributed commercial remote access trojans, written in C++ by Turkish programmers and active since 2003...
cybernetic	Botnet	`11`	CyberNetic is a botnet agent and Remote Access Trojan (RAT) that communicates primarily via Internet Relay Chat (IRC) networks to receive instructions from its ...
cycbot	Ransomware	`8`	Backdoor:Win32/Cycbot is a notorious, highly persistent botnet agent and backdoor primarily known for executing massive click-fraud campaigns and hijacking sear...
hlux	Trojan	`4`	Trojan:Win32/Hlux (more commonly known to the security industry as the Kelihos botnet) was a highly sophisticated, notoriously resilient peer-to-peer (P2P) ...
ponmocup	Trojan	`4`	Trojan:Win32/Ponmocup (also known as Vundo or Virtumonde) is one of the most sophisticated, longest-running, and massive botnets in history. Active for over a d...
snipr	Advanced Threat	`2`	HackTool:Win32/Snipr is a classification for malicious tools specifically designed to automate 'Credential Stuffing' attacks. While not a virus that infects a h...
bolik	Trojan	`1`	Bolik (classified in antivirus detection telemetry under designations including Trojan:Win32/Bolik, Trojan.Win32.Bolik, and Win32/Bolik) is a multi-stage trojan...
bototer	Trojan	`1`	Bototer (classified in antivirus detection telemetry under designations including Trojan:Win32/Bototer, Trojan.Win32.Bototer, and Win32/Bototer) is a multi-stag...
gracewire	Ransomware	`1`	<h3>Executive Summary</h3> GraceWire is a highly sophisticated, memory-resident Trojan primarily associated with the financially motivated threat group TA505 (t...
mailcheck	Trojan	`1`	<h3>Executive Summary</h3> MailCheck (often detected as HackTool.MailChecker, Riskware.MailCheck, or Trojan.AccountChecker) is a category of illicit utility sof...
peepviewer	Trojan	`1`	<h3>Executive Summary</h3> PeepViewer (often detected as HackTool.PeepViewer or Spyware.VNC) is a specialized utility designed to secretly monitor and control r...
shellme	Ransomware	`1`	<h3>Executive Summary</h3> Shellme is a classification applied to a category of HackTools specifically designed to establish reverse shells or bind shells. Whil...
spoofer	Advanced Threat	`1`	<h3>Executive Summary</h3> "Spoofer" (often flagged as HackTool.Spoofer or Riskware.Spoofer) is a detection classification for a category of software utilities ...
transmit	Trojan	`1`	<h3>Executive Summary</h3> Transmit is typically detected as a "HackTool" or Riskware. It refers to the malicious or unauthorized use of legitimate network tran...
beast	Rat	`Sampled`	Beast is a notorious Remote Access Trojan (RAT) that gained significant popularity in the early 2000s, primarily targeting Windows operating systems (Windows 95...
bump_rat	Trojan	`Sampled`	Bump-Rat is a specialized malware family that has drawn attention for its targeted application in cyber espionage campaigns. Unlike broadly distributed commodit...