YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_FRP_Apr20_1

Detects FRP fast reverse proxy tool often used by threat groups

Hack toolSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X

Author: Florian Roth (Nextron Systems)
Date: 2020-04-07
Modified: 2022-11-03
Score / Quality: 70 / 85

What this rule detects

Detects FRP fast reverse proxy tool often used by threat groups

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

hktl-frp-apr20-1.yarDetection Rule License 1.1

rule SIGNATURE_BASE_HKTL_FRP_Apr20_1
{
	meta:
		description = "Detects FRP fast reverse proxy tool often used by threat groups"
		author = "Florian Roth (Nextron Systems)"
		id = "55483832-0e0b-5c28-8be5-dbd14ddb50e3"
		date = "2020-04-07"
		modified = "2022-11-03"
		reference = "https://github.com/fatedier/frp"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_frp_proxy.yar#L2-L22"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "05537c1c4e29db76a24320fb7cb80b189860389cdb16a9dbeb0c8d30d9b37006"
		hash = "08c685c8febb5385f7548c2a64a27bae7123a937c5af958ebc08a3accb29978d"
		logic_hash = "21f91fd99aed8b62d804504889c41ca77567fd345cf4ea0ef00161eefa9324a7"
		score = 70
		quality = 85
		tags = ""

	strings:
		$x1 = "frp/vendor/github.com/spf13/" ascii
		$x2 = "github.com/fatedier/frp/vendor/" ascii
		$fpg2 = "<html"
		$fpg3 = "<HTML"
		$fpg6 = "<?xml"

	condition:
		1 of ( $x* ) and not 1 of ( $fp* )
}

Strings (5 patterns)

Identifier	Type	Value	Modifiers
$x1	text	"frp/vendor/github.com/spf13/"	ascii
$x2	text	"github.com/fatedier/frp/vendor/"	ascii
$fpg2	text	"<html"
$fpg3	text	"<HTML"
$fpg6	text	"<?xml"

Condition

1 of ( $x* ) and not 1 of ( $fp* )

In plain words (Heuristic)

At least 1 patterns in ( $x* ) must match.
At least 1 patterns in ( $fp* ) must match.

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References

https://github.com/fatedier/frp

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

05537c1c4e29db76a24320fb7cb80b189860389cdb16a9dbeb0c8d30d9b37006
08c685c8febb5385f7548c2a64a27bae7123a937c5af958ebc08a3accb29978d

Licence & attribution

Author: Florian Roth (Nextron Systems)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

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: 55483832-0e0b-5c28-8be5-dbd14ddb50e3

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