Egregor is a Ransomware-as-a-Service (RaaS) tool that was first observed in September 2020. Researchers have noted code similarities between Egregor and Sekhmet ransomware, as well as Maze ransomware.^[1]^[2]^[3]

ID: S0554

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Type: MALWARE

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Platforms: Windows

Contributors: Daniyal Naeem, BT Security; Matt Brenton, Zurich Insurance Group

Version: 1.0

Created: 29 December 2020

Last Modified: 14 October 2021

Techniques Used

Domain	ID		Name	Use
Enterprise	T1071	.001	Application Layer Protocol: Web Protocols	Egregor has communicated with its C2 servers via HTTPS protocol.^[4]
Enterprise	T1197		BITS Jobs	Egregor has used BITSadmin to download and execute malicious DLLs.^[4]
Enterprise	T1059	.001	Command and Scripting Interpreter: PowerShell	Egregor has used an encoded PowerShell command by a service created by Cobalt Strike for lateral movement.^[4]
		.003	Command and Scripting Interpreter: Windows Command Shell	Egregor has used batch files for execution and can launch Internet Explorer from cmd.exe.^[5]^[6]
Enterprise	T1486		Data Encrypted for Impact	Egregor can encrypt all non-system files using a hybrid AES-RSA algorithm prior to displaying a ransom note.^[1]^[6]
Enterprise	T1039		Data from Network Shared Drive	Egregor can collect any files found in the enumerated drivers before sending it to its C2 channel.^[1]
Enterprise	T1140		Deobfuscate/Decode Files or Information	Egregor has been decrypted before execution.^[1]^[6]
Enterprise	T1484	.001	Domain Policy Modification: Group Policy Modification	Egregor can modify the GPO to evade detection.^[6] ^[4]
Enterprise	T1574	.002	Hijack Execution Flow: DLL Side-Loading	Egregor has used DLL side-loading to execute its payload.^[2]
Enterprise	T1562	.001	Impair Defenses: Disable or Modify Tools	Egregor has disabled Windows Defender to evade protections.^[4]
Enterprise	T1105		Ingress Tool Transfer	Egregor has the ability to download files from its C2 server.^[6]^[4]
Enterprise	T1036	.004	Masquerading: Masquerade Task or Service	Egregor has masqueraded the svchost.exe process to exfiltrate data.^[4]
Enterprise	T1106		Native API	Egregor has used the Windows API to make detection more difficult.^[2]
Enterprise	T1027	.002	Obfuscated Files or Information: Software Packing	Egregor's payloads are custom-packed, archived and encrypted to prevent analysis.^[1]^[2]
Enterprise	T1069	.002	Permission Groups Discovery: Domain Groups	Egregor can conduct Active Directory reconnaissance using tools such as Sharphound or AdFind.^[4]
Enterprise	T1055		Process Injection	Egregor can inject its payload into iexplore.exe process.^[2]
Enterprise	T1219		Remote Access Software	Egregor has checked for the LogMein event log in an attempt to encrypt files in remote machines.^[2]
Enterprise	T1218	.010	System Binary Proxy Execution: Regsvr32	Egregor has used regsvr32.exe to execute malicious DLLs.^[5]
		.011	System Binary Proxy Execution: Rundll32	Egregor has used rundll32 during execution.^[6]
Enterprise	T1082		System Information Discovery	Egregor can perform a language check of the infected system and can query the CPU information (cupid).^[5]^[1]
Enterprise	T1049		System Network Connections Discovery	Egregor can enumerate all connected drives.^[1]
Enterprise	T1033		System Owner/User Discovery	Egregor has used tools to gather information about users.^[4]
Enterprise	T1124		System Time Discovery	Egregor contains functionality to query the local/system time.^[5]
Enterprise	T1497		Virtualization/Sandbox Evasion	Egregor has used multiple anti-analysis and anti-sandbox techniques to prevent automated analysis by sandboxes.^[2]^[1]
		.003	Time Based Evasion	Egregor can perform a long sleep (greater than or equal to 3 minutes) to evade detection.^[5]

Egregor

Enterprise Layer

Techniques Used

References