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SEKOIA_Vpn_Mul_Softether

Detect the open-source SoftEther VPN

GenericSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-04-15
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detect the open-source SoftEther VPN

It defines 13 patterns (13 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
vpn-mul-softether.yarDetection Rule License 1.1
rule SEKOIA_Vpn_Mul_Softether
{
	meta:
		description = "Detect the open-source SoftEther VPN"
		author = "Sekoia.io"
		id = "a1fbf4fe-b934-4a66-b6b1-ebe2f83505cd"
		date = "2024-04-15"
		modified = "2024-12-19"
		reference = "https://www.softether.org/"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/vpn_mul_softether.yar#L1-L29"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "f93e838631518590e518f29557c60a40734da30b62c056f8ebb8febed389551b"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\softether_se%s"
		$ = "GET /vgc_download_dat/ HTTP/1.1"
		$ = "http://x%c.x%c.client.api.vpngate2.jp/api/"
		$ = "http://x0.x0.client.api.vpngate2.jp/check/check.txt"
		$ = "https://x%c.x%c.statistics.api.vpngate2.jp/api/statistics/"
		$ = "Software\\SoftEther Project\\SoftEther VPN\\"
		$ = "|vpnsetup_nosign.exe" wide
		$ = "/ISEASYINSTALLER:%u" wide
		$ = "/CALLERSFXPATH:\"%s\"" wide
		$ = "vpn_client.config" wide
		$ = "vpn_bridge.config" wide
		$ = "|backup_dir_readme.txt" wide
		$ = "vpn_debuginfo_%04u%02u%02u_%02u%02u%02u.zip" wide

	condition:
		8 of them
}

Strings (13 patterns)

IdentifierTypeValueModifiers
$text"SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\softether_se%s"
$text"GET /vgc_download_dat/ HTTP/1.1"
$text"http://x%c.x%c.client.api.vpngate2.jp/api/"
$text"http://x0.x0.client.api.vpngate2.jp/check/check.txt"
$text"https://x%c.x%c.statistics.api.vpngate2.jp/api/statistics/"
$text"Software\\SoftEther Project\\SoftEther VPN\\"
$text"|vpnsetup_nosign.exe"wide
$text"/ISEASYINSTALLER:%u"wide
$text"/CALLERSFXPATH:\"%s\""wide
$text"vpn_client.config"wide
$text"vpn_bridge.config"wide
$text"|backup_dir_readme.txt"wide
$text"vpn_debuginfo_%04u%02u%02u_%02u%02u%02u.zip"wide

Condition

8 of them

In plain words (Heuristic)

  • At least 8 patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: a1fbf4fe-b934-4a66-b6b1-ebe2f83505cd

Metadata

version1.0
classificationTLP:CLEAR

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