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DITEKSHEN_INDICATOR_TOOL_Krbrelay

Detects KrbRelay

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 KrbRelay

Targets: Windows PE.

It defines 10 patterns (10 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
indicator-tool-krbrelay.yarBSD 2-Clause License
rule DITEKSHEN_INDICATOR_TOOL_Krbrelay : FILE
{
	meta:
		description = "Detects KrbRelay"
		author = "ditekshen"
		id = "c8baac8a-54f3-5f53-93f8-daabeaaaff44"
		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#L1819-L1836"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "f76b585cd2d741eab9d91ffd5a34c38696ac573cba1a3752d21c4b8b6681ad7b"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "System.Collections.Generic.IEnumerable<System.IntPtr>.GetEnumerator" fullword ascii
		$s2 = "System.Collections.Generic.IEnumerator<System.IntPtr>.get_Current" fullword ascii
		$s3 = "GetProcessIdFromIPid" fullword ascii
		$g1 = "hello.stg" fullword wide
		$g2 = "DSInternals.Common" fullword ascii
		$g3 = "C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_7b3eed059f4c3e41\\Amd64\\UNIDRV.DLL" fullword wide
		$g4 = "C:\\Windows\\System32\\kernelbase.dll" fullword wide
		$g5 = "get_UnsupportedSecretEncryptionType" fullword ascii
		$g6 = "CoInitializeSecurity Error: 0x{0:X8}. Exploit will fail." fullword wide
		$g7 = "AuthnSvc: {0} - PrincName: {1}" fullword wide

	condition:
		uint16( 0 ) == 0x5a4d and ( ( all of ( $s* ) and 4 of ( $g* ) ) or ( 7 of them ) )
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$s1text"System.Collections.Generic.IEnumerable<System.IntPtr>.GetEnumerator"fullword ascii
$s2text"System.Collections.Generic.IEnumerator<System.IntPtr>.get_Current"fullword ascii
$s3text"GetProcessIdFromIPid"fullword ascii
$g1text"hello.stg"fullword wide
$g2text"DSInternals.Common"fullword ascii
$g3text"C:\\Windows\\System32\\DriverStore\\FileRepository\\ntprint.inf_amd64_7b3eed059f4c3e41\\Amd64\\UNIDRV.DLL"fullword wide
$g4text"C:\\Windows\\System32\\kernelbase.dll"fullword wide
$g5text"get_UnsupportedSecretEncryptionType"fullword ascii
$g6text"CoInitializeSecurity Error: 0x{0:X8}. Exploit will fail."fullword wide
$g7text"AuthnSvc: {0} - PrincName: {1}"fullword wide

Condition

uint16( 0 ) == 0x5a4d and ( ( all of ( $s* ) and 4 of ( $g* ) ) or ( 7 of them ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in ( $s* ) must match.
  • At least 4 patterns in ( $g* ) must match.
  • At least 7 patterns in the rule 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: c8baac8a-54f3-5f53-93f8-daabeaaaff44

Tags:FILE

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