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DITEKSHEN_INDICATOR_TOOL_Edrsilencer

Detects EDRSilencer

Suspicious / huntingEdr SilencerditekSHen 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 EDRSilencer

Associated malware family: Edr Silencer.

Targets: Windows PE.

It defines 12 patterns (12 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
indicator-tool-edrsilencer.yarBSD 2-Clause License
rule DITEKSHEN_INDICATOR_TOOL_Edrsilencer : FILE
{
	meta:
		description = "Detects EDRSilencer"
		author = "ditekshen"
		id = "29b6da1e-9138-5ee6-b9fd-d7b3c7f48626"
		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#L1838-L1857"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "da00aced2608fd5e192397ef2346ac247f29f993995fb90189e05da60be15d13"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "block \"C:\\Windows\\System32\\curl.exe\"" ascii
		$s2 = "blockedr" fullword ascii
		$s3 = "edrProcess" fullword ascii
		$s4 = "BlockEdrProcessTraffic" fullword ascii
		$s5 = "isInEdrProcessList" fullword ascii
		$s6 = "EDRSilencer.c" fullword ascii
		$v1 = "elastic-agent.exe" fullword ascii nocase
		$v2 = "CybereasonAV.exe" fullword ascii nocase
		$v3 = "SentinelAgent.exe" fullword ascii nocase
		$v4 = "fortiedr.exe" fullword ascii nocase
		$v5 = "MsMpEng.exe" fullword ascii nocase
		$v6 = "CylanceSvc.exe" fullword ascii nocase

	condition:
		uint16( 0 ) == 0x5a4d and ( 4 of ( $s* ) or ( 3 of ( $s* ) and 1 of ( $v* ) ) )
}

Strings (12 patterns)

IdentifierTypeValueModifiers
$s1text"block \"C:\\Windows\\System32\\curl.exe\""ascii
$s2text"blockedr"fullword ascii
$s3text"edrProcess"fullword ascii
$s4text"BlockEdrProcessTraffic"fullword ascii
$s5text"isInEdrProcessList"fullword ascii
$s6text"EDRSilencer.c"fullword ascii
$v1text"elastic-agent.exe"fullword ascii nocase
$v2text"CybereasonAV.exe"fullword ascii nocase
$v3text"SentinelAgent.exe"fullword ascii nocase
$v4text"fortiedr.exe"fullword ascii nocase
$v5text"MsMpEng.exe"fullword ascii nocase
$v6text"CylanceSvc.exe"fullword ascii nocase

Condition

uint16( 0 ) == 0x5a4d and ( 4 of ( $s* ) or ( 3 of ( $s* ) and 1 of ( $v* ) ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 4 patterns in ( $s* ) must match.
  • At least 3 patterns in ( $s* ) must match.
  • At least 1 patterns in ( $v* ) 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: 29b6da1e-9138-5ee6-b9fd-d7b3c7f48626

Tags:FILE

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