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MALPEDIA_Win_Nefilim_Auto

autogenerated rule brought to you by yara-signator

MalwareNefilimMalpedia 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: Nefilim.

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

Summary generated from the rule's metadata and condition.

Rule source

win-nefilim-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Nefilim_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "33eab17d-97c0-5d73-a9f1-b767c75e5881"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.nefilim"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.nefilim_auto.yar#L1-L118"
		license_url = "N/A"
		logic_hash = "3a27af8833785290d94c5f72bdf3db44afcefd8ef480b73988f50858a895ec4a"
		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 = { 8810 40 49 75f7 8b4dfc 5f 33cd }
		$sequence_1 = { 7d0d 8a4c181c 8888b8e54000 40 ebe9 }
		$sequence_2 = { be???????? 56 bb???????? 53 ffd7 85c0 }
		$sequence_3 = { ffd6 85c0 0f8436010000 8b442414 }
		$sequence_4 = { 50 ffd7 8d4df4 83ec1c }
		$sequence_5 = { f7db 1adb 6a01 33ff 8d75c4 e8???????? }
		$sequence_6 = { 75f7 8b4dfc 5f 33cd }
		$sequence_7 = { 0f862d020000 be48e80100 eb04 8b4c2418 2b4c2428 }
		$sequence_8 = { f3a5 ff2495d0324000 8bc7 ba03000000 83e904 720c }
		$sequence_9 = { ff74242c 8944242c e8???????? ff74242c e8???????? be00010000 56 }

	condition:
		7 of them and filesize < 142336
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8810 40 49 75f7 8b4dfc 5f 33cd }
$sequence_1hex{ 7d0d 8a4c181c 8888b8e54000 40 ebe9 }
$sequence_2hex{ be???????? 56 bb???????? 53 ffd7 85c0 }
$sequence_3hex{ ffd6 85c0 0f8436010000 8b442414 }
$sequence_4hex{ 50 ffd7 8d4df4 83ec1c }
$sequence_5hex{ f7db 1adb 6a01 33ff 8d75c4 e8???????? }
$sequence_6hex{ 75f7 8b4dfc 5f 33cd }
$sequence_7hex{ 0f862d020000 be48e80100 eb04 8b4c2418 2b4c2428 }
$sequence_8hex{ f3a5 ff2495d0324000 8bc7 ba03000000 83e904 720c }
$sequence_9hex{ ff74242c 8944242c e8???????? ff74242c e8???????? be00010000 56 }

Condition

7 of them and filesize < 142336

In plain words (Heuristic)

  • The file must be smaller than 142336 (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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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: 33eab17d-97c0-5d73-a9f1-b767c75e5881

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

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