T1110.001: Brute Force: Password Guessing

Framework: MITRE ATT&CK · Tactic: Initial Access · Total Cataloged Families: 14 · Observed Samples: 154 · Primary Threat Categories: Advanced Threat · Trojan · Ransomware

Operational Executive Summary

T1110.001 (Brute Force: Password Guessing) is classified under the Initial Access tactic within the MITRE ATT&CK framework. Techniques used by adversaries to gain their initial foothold within an enterprise network, spanning spearphishing, drive-by downloads, exploit kits, and compromised edge perimeter appliances. In telemetry gathered across enterprise endpoints and the EMBER 2018 benchmark, this technique was weaponized across 14 distinct malware families, totaling over 154 validated samples.

Technical Anatomy & Adversary Tradecraft

Adversaries leverage Brute Force: Password Guessing to accomplish operational objectives while minimizing anomalous forensic footprints. When executing Brute Force: Password Guessing, 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, T1110.001 is frequently observed functioning as an intermediate bridge: initial access payloads (such as spearphishing loaders or exploit macros) execute Brute Force: Password Guessing 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/T1110/001/.

Detection Engineering & Threat Hunting

Detecting Brute Force: Password Guessing 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 T1110.001 (Brute Force: Password Guessing) 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 Brute Force: Password Guessing across adjacent network segments.

→ Incident Response Guidance: Read our Active Incident Response Playbook

Cataloged Malware Families Utilizing T1110.001 (14 Families)

The following malware families in the SystemHelpDesk catalog have been verified utilizing T1110.001 (Brute Force: Password Guessing):

14 families

Family	Category	Sample Count	Technical Summary
rbot	Backdoor	`109`	Rbot (widely cataloged across vendor telemetry as Backdoor:Win32/Rbot, W32.Spybot, Worm:Win32/Rbot, and RxBot) is one of the most prolific and historically sign...
bruteforce	Hacktool	`13`	BruteForce (classified across antivirus engines as HackTool:Win32/BruteForce and Tool:Win32/BruteForce) is a multi-protocol authentication credential-cracking t...
3proxy	Trojan	`12`	3Proxy (classified in antivirus detection telemetry under designations including Trojan:Win32/3Proxy, Trojan.Win32.3Proxy, and Win32/3Proxy) is a multi-stage tr...
morto	Advanced Threat	`4`	Worm:Win32/Morto is a classic, highly aggressive network worm specifically designed to propagate across the internet and internal enterprise networks by attacki...
brambul	Worm	`2`	Worm:Win32/Brambul is an aggressive network-spreading worm developed by North Korean state-sponsored threat group HIDDEN COBRA (Lazarus Group / APT38). Discover...
ircbrute	Trojan	`2`	Trojan:Win32/Ircbrute is a classification for a botnet agent or worm that combines the command-and-control (C2) infrastructure of an Internet Relay Chat (IRC) b...
ircfast	Trojan	`2`	Worm/Trojan:Win32/Ircfast is a network worm and botnet agent that leverages the Internet Relay Chat (IRC) protocol for command and control. Prevalent during the...
sqlcrack	Ransomware	`2`	HackTool:Win32/Sqlcrack is a detection for specialized offensive security tools and brute-force utilities designed to compromise backend databases, predominantl...
wootbot	Advanced Threat	`2`	Worm:Win32/Wootbot (also known as W32.Wootbot) is a classic, historically significant network worm and IRC botnet agent that was highly prevalent in the mid-200...
wpakill	Advanced Threat	`2`	HackTool:Win32/Wpakill is a classification for a suite of specialized utilities designed to audit, brute-force, or crack Wi-Fi network security, specifically ta...
fspm	Ransomware	`1`	<h3>Executive Summary</h3> Fspm is a classification typically applied to a HackTool or localized exploit script designed to bypass security controls or facilita...
mirai	Botnet	`1`	Mirai (Japanese for 'the future') is a revolutionary Linux-based malware family and botnet that transformed internet of things (IoT) security upon its emergence...
nlbrute	Ransomware	`1`	<h3>Executive Summary</h3> NLBrute is a notorious, commercially available hacking tool specifically designed to perform high-speed, automated brute-force attack...
xscan	Advanced Threat	`1`	<h3>Executive Summary</h3> XScan is a powerful, legacy network vulnerability scanner and enumeration tool. Originally developed as a legitimate security auditin...