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MALPEDIA_Win_Scarecrow_Auto

autogenerated rule brought to you by yara-signator

MalwareScarecrowMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Scarecrow.

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

Summary generated from the rule's metadata and condition.

Rule source

win-scarecrow-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Scarecrow_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "7fab5d70-082d-5157-9024-2dcf426a6b02"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.scarecrow"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.scarecrow_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "118b6550fd678defbfd11297576eb5fee6908684c3ebc4ca9e3ce500d8361259"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { f7fe 85d2 7521 b905000000 8b45f4 99 f7f9 }
		$sequence_1 = { 889435d5f9ffff 46 83fe0c 72d3 8d85d5f9ffff 8985e0f6ffff c685f8faffff00 }
		$sequence_2 = { c6458a37 c6458b0e c6458c69 c6458d01 c6458e28 8a854dffffff e8???????? }
		$sequence_3 = { f7fb 8b45f0 c1e602 8975ec 85d2 743f }
		$sequence_4 = { 40 74dd a1???????? 8b4df8 5f 893401 8bc6 }
		$sequence_5 = { c6458f0d 89852cffffff c6459044 8a4585 e8???????? c645e800 c645e900 }
		$sequence_6 = { f7fb 8d427f 99 f7fb 889435a5faffff 46 }
		$sequence_7 = { c685c0fdffff25 c685c1fdffff7c c685c2fdffff25 c685c3fdffff36 c685c4fdffff25 c685c5fdffff25 }
		$sequence_8 = { 83c8fe 40 7579 b905000000 0f1f440000 8b45f4 99 }
		$sequence_9 = { 6685c0 75f5 2bce d1f9 51 8d45c9 8bca }

	condition:
		7 of them and filesize < 501760
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ f7fe 85d2 7521 b905000000 8b45f4 99 f7f9 }
$sequence_1hex{ 889435d5f9ffff 46 83fe0c 72d3 8d85d5f9ffff 8985e0f6ffff c685f8faffff00 }
$sequence_2hex{ c6458a37 c6458b0e c6458c69 c6458d01 c6458e28 8a854dffffff e8???????? }
$sequence_3hex{ f7fb 8b45f0 c1e602 8975ec 85d2 743f }
$sequence_4hex{ 40 74dd a1???????? 8b4df8 5f 893401 8bc6 }
$sequence_5hex{ c6458f0d 89852cffffff c6459044 8a4585 e8???????? c645e800 c645e900 }
$sequence_6hex{ f7fb 8d427f 99 f7fb 889435a5faffff 46 }
$sequence_7hex{ c685c0fdffff25 c685c1fdffff7c c685c2fdffff25 c685c3fdffff36 c685c4fdffff25 c685c5fdffff25 }
$sequence_8hex{ 83c8fe 40 7579 b905000000 0f1f440000 8b45f4 99 }
$sequence_9hex{ 6685c0 75f5 2bce d1f9 51 8d45c9 8bca }

Condition

7 of them and filesize < 501760

In plain words (Heuristic)

  • The file must be smaller than 501760 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

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References

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

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

Rule id: 7fab5d70-082d-5157-9024-2dcf426a6b02

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE