Nishang_Webshell

Description

Detects a ASPX web shell

Query · yara

strings:
		$s1 = "psi.Arguments = \"-noninteractive \" + \"-executionpolicy bypass \" + arg;" ascii
		$s2 = "output.Text += \"\nPS> \" + console.Text + \"\n\" + do_ps(console.Text);" ascii
		$s3 = "<title>Antak Webshell</title>" fullword ascii
		$s4 = "<asp:Button ID=\"executesql\" runat=\"server\" Text=\"Execute SQL Query\"" ascii
	condition:
		( uint16(0) == 0x253C and filesize < 100KB and 1 of ($s*) )
Raw source Nishang_Webshell · YARA
Esc
Published by Neo23x0/signature-base ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
rule Nishang_Webshell {
	meta:
		description = "Detects a ASPX web shell"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
		author = "Florian Roth (Nextron Systems)"
		reference = "https://github.com/samratashok/nishang"
		date = "2016-09-11"
		id = "785e6da7-097e-598b-9799-ffe43738d718"
	strings:
		$s1 = "psi.Arguments = \"-noninteractive \" + \"-executionpolicy bypass \" + arg;" ascii
		$s2 = "output.Text += \"\nPS> \" + console.Text + \"\n\" + do_ps(console.Text);" ascii
		$s3 = "<title>Antak Webshell</title>" fullword ascii
		$s4 = "<asp:Button ID=\"executesql\" runat=\"server\" Text=\"Execute SQL Query\"" ascii
	condition:
		( uint16(0) == 0x253C and filesize < 100KB and 1 of ($s*) )
}

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