T1021.002: Remote Services: SMB/Windows Admin Shares

Framework: MITRE ATT&CK · Tactic: Lateral Movement · Total Cataloged Families: 20 · Observed Samples: 5,423 · Primary Threat Categories: Worm · Ransomware · Advanced Threat

Operational Executive Summary

T1021.002 (Remote Services: SMB/Windows Admin Shares) is classified under the Lateral Movement tactic within the MITRE ATT&CK framework. Methods used to extend access to additional remote systems and compute nodes within an enterprise network via SMB/RPC, Windows Remote Management, and RDP sessions. In telemetry gathered across enterprise endpoints and the EMBER 2018 benchmark, this technique was weaponized across 20 distinct malware families, totaling over 5,423 validated samples.

Technical Anatomy & Adversary Tradecraft

Adversaries leverage Remote Services: SMB/Windows Admin Shares to accomplish operational objectives while minimizing anomalous forensic footprints. When executing Remote Services: SMB/Windows Admin Shares, 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, T1021.002 is frequently observed functioning as an intermediate bridge: initial access payloads (such as spearphishing loaders or exploit macros) execute Remote Services: SMB/Windows Admin Shares 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/T1021/002/.

Detection Engineering & Threat Hunting

Detecting Remote Services: SMB/Windows Admin Shares 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 T1021.002 (Remote Services: SMB/Windows Admin Shares) 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 Remote Services: SMB/Windows Admin Shares across adjacent network segments.

→ Incident Response Guidance: Read our Botnet Protection & Remediation

Cataloged Malware Families Utilizing T1021.002 (20 Families)

The following malware families in the SystemHelpDesk catalog have been verified utilizing T1021.002 (Remote Services: SMB/Windows Admin Shares):

20 families

Family	Category	Sample Count	Technical Summary
cobaltstrike	Hacktool	`3,500`	Cobalt Strike (specifically its Beacon payload component) is the world's most ubiquitous commercial adversary simulation and post-exploitation framework. Origin...
ainslot	Trojan	`635`	Trojan:Win32/Ainslot (also cataloged in threat telemetry as Worm:Win32/Ainslot.A, TROJ_GEN.UAE171Y, or Win32/Ainslot) is a persistent Windows trojan dropper and...
snake	Advanced Threat	`450`	Snake (also tracked across intelligence agencies and vendors as Turla, Uroburos, Ouroboros, and Snake Rootkit) is an exceptionally sophisticated cyber espionage...
kolab	Worm	`219`	Kolab (cataloged across security vendors as Worm:Win32/Kolab, Net-Worm.Win32.Kolab, WORM_KOLABC, and W32/Kolab) is a prolific Windows network worm and backdoor ...
viking	File Infector	`175`	Viking (cataloged across security vendors as Virus:Win32/Viking, Worm.Win32.Viking, and PE_VIKING) is an infamous and highly destructive hybrid file-infecting v...
parite	File Infector	`163`	Parite (tracked across cybersecurity vendor signatures as Virus:Win32/Parite.B, Virus.Win32.Parite.b, Pinfi, PE_PARITE.A, and W32.Pinite) is an infamous, highly...
netsky	Worm	`105`	Worm:Win32/Netsky is a historically monumental, prolific mass-mailing computer worm that emerged in February 2004, causing tens of millions of dollars in global...
propagate	Ransomware	`67`	Worm:Win32/Propagate is a behavioral heuristic detection utilized by antivirus engines to flag malware that aggressively attempts to copy itself across a networ...
tenga	File Infector	`50`	Tenga (cataloged across antivirus vendors under signatures including Virus:Win32/Tenga, Win32/Tenga.A, and Virus.Win32.Gat.a) is a landmark polymorphic file inf...
lovgate	Worm	`15`	Lovgate (historically documented across cybersecurity research as Worm:Win32/Lovgate, Email-Worm.Win32.Lovgate, and Backdoor:Win32/Lovgate) is a landmark mass-m...
mofksys	Worm	`14`	Mofksys (classified as Worm:Win32/Mofksys across Microsoft Defender, Sophos, and Kaspersky) is an evasive network and removable drive worm targeting Windows sys...
conficker	Worm	`11`	Conficker (also known as Downadup or Kido) is one of the most prolific, destructive, and technologically advanced computer worms in internet history, first disc...
smbd	Advanced Threat	`5`	Worm:Win32/Smbd (or similar heuristic detections for SMB-exploiting worms) refers to a class of self-propagating malware that heavily relies on the Server Messa...
sillysharecopy	Advanced Threat	`4`	Worm:Win32/Sillysharecopy is a heuristic detection name for a rudimentary, heavily repackaged class of computer worms that propagate primarily by copying themse...
kwampirs	Trojan	`3`	Backdoor:Win32/Kwampirs is a sophisticated, highly targeted remote access trojan (RAT) primarily associated with the Advanced Persistent Threat (APT) group know...
winexe	Advanced Threat	`2`	HackTool:Win32/Winexe (or simply `winexe`) is a legitimate, open-source GNU/Linux utility that allows users to execute commands remotely on Windows operating sy...
winexec	Ransomware	`2`	HackTool:Win32/Winexec (often associated with PsExec or similar remote execution utilities) is a heuristic detection for tools capable of executing commands and...
hptrickbot	Ransomware	`1`	Trojan:Win32/Hptrickbot is a heuristic detection associated with Trickbot, one of the most prolific and dangerous banking trojans and botnets in history. Origin...
karamanak	Trojan	`1`	<h3>Executive Summary</h3> Karamanak (highly likely a detection alias or typo for the infamous <strong>Carbanak</strong> APT malware) is an advanced, highly sop...
psexec	Ransomware	`1`	<h3>Executive Summary</h3> PsExec is a perfectly legitimate, highly powerful command-line utility created by Microsoft Sysinternals. It allows system administra...