sublimemediumRule

Attachment: RDP connection file

Recursively scans files and archives to detect RDP connection files. Coercing a target user into connecting to an attacker-owned RDP server can expose elements of their host and potentially lead to compromise.

MITRE ATT&CK

T1566.001 T1204.002 T1486 T1566 T1566.002 T1598

Detection Query

type.inbound
and (
  any(attachments, .file_extension =~ "rdp")
  or (
    any(attachments,
        .file_extension in~ $file_extensions_common_archives
        and any(file.explode(.), .file_extension =~ "rdp")
    )
  )
)

Author

ajpc500

Data Sources

Email MessagesEmail HeadersEmail Attachments

Platforms

References

Tags

Attack surface reduction

Raw Content

name: "Attachment: RDP connection file"
description: |
  Recursively scans files and archives to detect RDP connection files.

  Coercing a target user into connecting to an attacker-owned RDP server can expose elements of their host and potentially lead to compromise.
references:
  - "https://www.blackhillsinfosec.com/rogue-rdp-revisiting-initial-access-methods/"
  - "https://delivr.to/payloads?id=64f2d144-0060-472e-989c-3b331f6fb095"
type: "rule"
authors:
  - twitter: "ajpc500"
severity: "medium"
source: |
  type.inbound
  and (
    any(attachments, .file_extension =~ "rdp")
    or (
      any(attachments,
          .file_extension in~ $file_extensions_common_archives
          and any(file.explode(.), .file_extension =~ "rdp")
      )
    )
  )
tags:
  - "Attack surface reduction"
attack_types:
  - "Malware/Ransomware"
  - "Credential Phishing"
detection_methods:
  - "Archive analysis"
  - "File analysis"
id: "2409a422-4116-5a40-b929-c1b47ed5c1e5"