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MALPEDIA_Win_Flawedgrace_Auto

autogenerated rule brought to you by yara-signator

MalwareFlawedgraceMalpedia 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: Flawedgrace.

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

Summary generated from the rule's metadata and condition.

Rule source

win-flawedgrace-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Flawedgrace_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "6f950a4b-f50d-5bf4-9839-dd2d0367a532"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.flawedgrace"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.flawedgrace_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "59a872e135f9eae0947671cfc9a77340e428a38ee452a5294702c6eab9545dee"
		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 = { 83c414 8d4df8 e8???????? 8b4df8 3b4f24 7591 57 }
		$sequence_1 = { c68503e4ffff00 c68504e4ffff19 c68505e4ffffa0 c68506e4ffff3e c68507e4ffffa0 c68508e4ffff66 c68509e4ffffa0 }
		$sequence_2 = { 0fb6c0 85c0 741f 8b8de4c0ffff 8b5108 8995ccc0ffff 8b95e4c0ffff }
		$sequence_3 = { c6853ec3ffff00 c6853fc3ffff00 c68540c3ffff10 c68541c3ffff00 c68542c3ffff00 c68543c3ffff00 c68544c3ffff00 }
		$sequence_4 = { c685f9c9ffffe8 c685fac9ffffda c685fbc9ffff0a c685fcc9ffff00 c685fdc9ffff00 c685fec9ffff48 c685ffc9ffff83 }
		$sequence_5 = { 0fb6c3 330c85e0934500 334f48 894de4 c1eb18 8b45ec c1e810 }
		$sequence_6 = { c6857de1ffff00 c6857ee1ffff00 c6857fe1ffff00 c68580e1ffff00 c68581e1ffff00 c68582e1ffff00 c68583e1ffff00 }
		$sequence_7 = { c68580e4ffff00 c68581e4ffff00 c68582e4ffff00 c68583e4ffff00 c68584e4ffff00 }
		$sequence_8 = { 8b4e04 8b45e8 8d0441 eb06 8b4604 0345e8 8945d8 }
		$sequence_9 = { 0fb6c0 330c85e0d74500 0fb6c2 330c85e0d34500 338f90000000 8b879c000000 33d9 }

	condition:
		7 of them and filesize < 966656
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83c414 8d4df8 e8???????? 8b4df8 3b4f24 7591 57 }
$sequence_1hex{ c68503e4ffff00 c68504e4ffff19 c68505e4ffffa0 c68506e4ffff3e c68507e4ffffa0 c68508e4ffff66 c68509e4ffffa0 }
$sequence_2hex{ 0fb6c0 85c0 741f 8b8de4c0ffff 8b5108 8995ccc0ffff 8b95e4c0ffff }
$sequence_3hex{ c6853ec3ffff00 c6853fc3ffff00 c68540c3ffff10 c68541c3ffff00 c68542c3ffff00 c68543c3ffff00 c68544c3ffff00 }
$sequence_4hex{ c685f9c9ffffe8 c685fac9ffffda c685fbc9ffff0a c685fcc9ffff00 c685fdc9ffff00 c685fec9ffff48 c685ffc9ffff83 }
$sequence_5hex{ 0fb6c3 330c85e0934500 334f48 894de4 c1eb18 8b45ec c1e810 }
$sequence_6hex{ c6857de1ffff00 c6857ee1ffff00 c6857fe1ffff00 c68580e1ffff00 c68581e1ffff00 c68582e1ffff00 c68583e1ffff00 }
$sequence_7hex{ c68580e4ffff00 c68581e4ffff00 c68582e4ffff00 c68583e4ffff00 c68584e4ffff00 }
$sequence_8hex{ 8b4e04 8b45e8 8d0441 eb06 8b4604 0345e8 8945d8 }
$sequence_9hex{ 0fb6c0 330c85e0d74500 0fb6c2 330c85e0d34500 338f90000000 8b879c000000 33d9 }

Condition

7 of them and filesize < 966656

In plain words (Heuristic)

  • The file must be smaller than 966656 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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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: 6f950a4b-f50d-5bf4-9839-dd2d0367a532

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