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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_Nishang_PS1_Invoke_Powershelltcponeline

Detects PowerShell Oneliner in Nishang's repository

Hack toolSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth (Nextron Systems)
Date
2021-03-03
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Detects PowerShell Oneliner in Nishang's repository

It defines 3 patterns (3 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
hktl-nishang-ps1-invoke-powershelltcponeline.yarDetection Rule License 1.1
rule SIGNATURE_BASE_HKTL_Nishang_PS1_Invoke_Powershelltcponeline
{
	meta:
		description = "Detects PowerShell Oneliner in Nishang's repository"
		author = "Florian Roth (Nextron Systems)"
		id = "0218ebbd-2dbe-5838-ab53-1e78e3f97b9e"
		date = "2021-03-03"
		modified = "2023-12-05"
		reference = "https://github.com/samratashok/nishang/blob/master/Shells/Invoke-PowerShellTcpOneLine.ps1"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_hafnium.yar#L105-L119"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "2f4c948974da341412ab742e14d8cdd33c1efa22b90135fcfae891f08494ac32"
		logic_hash = "59622bff95de1077d26ee4547f37cd1045c0c1fc6817df40ff2564b33a962a07"
		score = 75
		quality = 85
		tags = ""

	strings:
		$s1 = "=([text.encoding]::ASCII).GetBytes((iex $" ascii wide
		$s2 = ".GetStream();[byte[]]$" ascii wide
		$s3 = "New-Object Net.Sockets.TCPClient('" ascii wide

	condition:
		all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"=([text.encoding]::ASCII).GetBytes((iex $"ascii wide
$s2text".GetStream();[byte[]]$"ascii wide
$s3text"New-Object Net.Sockets.TCPClient('"ascii wide

Condition

all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

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References

Sample hashes

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

  • 2f4c948974da341412ab742e14d8cdd33c1efa22b90135fcfae891f08494ac32

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: 0218ebbd-2dbe-5838-ab53-1e78e3f97b9e

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