Remote Encrypting File System Abuse
Detects remote RPC calls to possibly abuse remote encryption service via MS-EFSR
Sigma rule (View on GitHub)
1title: Remote Encrypting File System Abuse
2id: 5f92fff9-82e2-48eb-8fc1-8b133556a551
3status: test
4description: Detects remote RPC calls to possibly abuse remote encryption service via MS-EFSR
5references:
6 - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36942
7 - https://github.com/jsecurity101/MSRPC-to-ATTACK/blob/ddd4608fe8684fcf2fcf9b48c5f0b3c28097f8a3/documents/MS-EFSR.md
8 - https://github.com/zeronetworks/rpcfirewall
9 - https://zeronetworks.com/blog/stopping-lateral-movement-via-the-rpc-firewall/
10author: Sagie Dulce, Dekel Paz
11date: 2022-01-01
12modified: 2022-01-01
13tags:
14 - attack.lateral-movement
15logsource:
16 product: rpc_firewall
17 category: application
18 definition: 'Requirements: install and apply the RPC Firewall to all processes with "audit:true action:block uuid:df1941c5-fe89-4e79-bf10-463657acf44d or c681d488-d850-11d0-8c52-00c04fd90f7e'
19detection:
20 selection:
21 EventLog: RPCFW
22 EventID: 3
23 InterfaceUuid:
24 - df1941c5-fe89-4e79-bf10-463657acf44d
25 - c681d488-d850-11d0-8c52-00c04fd90f7e
26 condition: selection
27falsepositives:
28 - Legitimate usage of remote file encryption
29level: high
References
-
A repository that maps commonly used attacks using MSRPC protocols to ATT&CK - jsecurity101/MSRPC-to-ATTACK
Read More -
-
RPC Firewall is a free & open source tool, which detects and protects against RPC based attacks used by ransomware for lateral movement and other attacks
Read More
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