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YARA · ditekSHen detection

DITEKSHEN_INDICATOR_TOOL_Sharpnopsexec

Detects SharpNoPSExec

Suspicious / huntingditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-09-25
Score / Quality
75 / 75

What this rule detects

Detects SharpNoPSExec

Targets: Windows PE.

It defines 8 patterns (8 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
indicator-tool-sharpnopsexec.yarBSD 2-Clause License
rule DITEKSHEN_INDICATOR_TOOL_Sharpnopsexec : FILE
{
	meta:
		description = "Detects SharpNoPSExec"
		author = "ditekSHen"
		id = "10898364-6d77-5127-a16b-5fd3b1c652d5"
		date = "2020-11-06"
		modified = "2024-09-25"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/indicator_tools.yar#L849-L864"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "c1d76639e7b6464d302729b48bbcd810216132868035904bb9866e7b31ccfac2"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "|-> Service" wide
		$s2 = "authenticated as" wide
		$s3 = "ImpersonateLoggedOnUser failed. Error:{0}" wide
		$s4 = "uPayload" fullword ascii
		$s5 = "pcbBytesNeeded" fullword ascii
		$s6 = "SharpNoPSExec" ascii wide
		$pdb1 = "SharpNoPSExec\\obj\\Debug\\SharpNoPSExec.pdb" ascii
		$pdb2 = "SharpNoPSExec\\obj\\Release\\SharpNoPSExec.pdb" ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( 4 of ( $s* ) or ( 1 of ( $pdb* ) and 1 of ( $s* ) ) )
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$s1text"|-> Service"wide
$s2text"authenticated as"wide
$s3text"ImpersonateLoggedOnUser failed. Error:{0}"wide
$s4text"uPayload"fullword ascii
$s5text"pcbBytesNeeded"fullword ascii
$s6text"SharpNoPSExec"ascii wide
$pdb1text"SharpNoPSExec\\obj\\Debug\\SharpNoPSExec.pdb"ascii
$pdb2text"SharpNoPSExec\\obj\\Release\\SharpNoPSExec.pdb"ascii

Condition

uint16( 0 ) == 0x5a4d and ( 4 of ( $s* ) or ( 1 of ( $pdb* ) and 1 of ( $s* ) ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 4 patterns in ( $s* ) must match.
  • At least 1 patterns in ( $pdb* ) must match.
  • At least 1 patterns in ( $s* ) must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: 10898364-6d77-5127-a16b-5fd3b1c652d5

Tags:FILE

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