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DETECTION OVERVIEW

Unusual SMB Executable File Transfer

Risk Factors

Gaining access to the administrative file shares on multiple devices can be difficult because an attacker must first acquire domain-level administrator privileges. After the attacker has these privileges, they can easily transfer malicious payloads and compromise multiple devices on the network.

Kill Chain

Lateral Movement

Risk Score

78

Detection diagram
Next in Lateral Movement: Active Directory Domain Services Exploit Attempt - CVE-2022-26923

Attack Background

After an attacker compromises a workstation, the attacker searches for new targets on the network. Ideally, the compromised workstation has credentials that provide the attacker with administrative access to a new target. With administrative access, the attacker can transfer an executable file to a default file share (such as ADMIN$ or C$) on the target. After the malicious payload from the file runs (through the actions of the attacker or the victim), the attacker can move laterally to the newly compromised device to conduct more attacks.

Mitigation Options

Restrict file share access to only authorized IP addresses and users

Disable anonymous access to the IPC$ share (null session)

Restrict file share authentication with a password

MITRE ATT&CK ID

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