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MALPEDIA_Win_Winsloader_Auto

autogenerated rule brought to you by yara-signator

MalwareWinsloaderMalpedia 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: Winsloader.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-winsloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Winsloader_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "ba76a90b-c734-50e9-972e-d56f090bf0e5"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winsloader"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.winsloader_auto.yar#L1-L167"
		license_url = "N/A"
		logic_hash = "3e23de21e591d5e814dc9229e916c96b455b15e493e83f4f6d54002bf8da25e4"
		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 = { 6800100000 56 8d8375050000 6a00 a3???????? ff15???????? 8bf8 }
		$sequence_1 = { 68???????? 52 e8???????? 68???????? 8d743e06 e8???????? }
		$sequence_2 = { 888c3500fcffff 8d4f01 51 8d943501fcffff }
		$sequence_3 = { 8d9b00000000 891cc8 895cc804 41 }
		$sequence_4 = { 83c410 8d7001 8d9b00000000 8a08 40 84c9 75f9 }
		$sequence_5 = { 83c40c 66c7843500fcfffff90b 8d4801 8d4900 8a10 40 }
		$sequence_6 = { 83c40c 6800040000 8d8dfcf7ffff 51 }
		$sequence_7 = { 57 8bd8 ff15???????? 53 e8???????? 8bf0 83c404 }
		$sequence_8 = { 742e 6a00 57 ff15???????? 6a00 }
		$sequence_9 = { 42 3bd3 72f3 8b7c2424 e9???????? 8b442414 }
		$sequence_10 = { 83c404 85f6 0f847f000000 57 6a00 }
		$sequence_11 = { 741c 8b74241c 8bcf 2bf7 }
		$sequence_12 = { 83e03f 6bc830 8b0495c0c00110 f644082801 }
		$sequence_13 = { e9???????? c745e0647c0110 e9???????? c745dc02000000 }
		$sequence_14 = { e8???????? 83c448 68???????? 6a40 68???????? e8???????? }
		$sequence_15 = { 56 e8???????? ff75c8 e8???????? 83c438 33f6 }

	condition:
		7 of them and filesize < 270336
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 6800100000 56 8d8375050000 6a00 a3???????? ff15???????? 8bf8 }
$sequence_1hex{ 68???????? 52 e8???????? 68???????? 8d743e06 e8???????? }
$sequence_2hex{ 888c3500fcffff 8d4f01 51 8d943501fcffff }
$sequence_3hex{ 8d9b00000000 891cc8 895cc804 41 }
$sequence_4hex{ 83c410 8d7001 8d9b00000000 8a08 40 84c9 75f9 }
$sequence_5hex{ 83c40c 66c7843500fcfffff90b 8d4801 8d4900 8a10 40 }
$sequence_6hex{ 83c40c 6800040000 8d8dfcf7ffff 51 }
$sequence_7hex{ 57 8bd8 ff15???????? 53 e8???????? 8bf0 83c404 }
$sequence_8hex{ 742e 6a00 57 ff15???????? 6a00 }
$sequence_9hex{ 42 3bd3 72f3 8b7c2424 e9???????? 8b442414 }
$sequence_10hex{ 83c404 85f6 0f847f000000 57 6a00 }
$sequence_11hex{ 741c 8b74241c 8bcf 2bf7 }
$sequence_12hex{ 83e03f 6bc830 8b0495c0c00110 f644082801 }
$sequence_13hex{ e9???????? c745e0647c0110 e9???????? c745dc02000000 }
$sequence_14hex{ e8???????? 83c448 68???????? 6a40 68???????? e8???????? }
$sequence_15hex{ 56 e8???????? ff75c8 e8???????? 83c438 33f6 }

Condition

7 of them and filesize < 270336

In plain words (Heuristic)

  • The file must be smaller than 270336 (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: ba76a90b-c734-50e9-972e-d56f090bf0e5

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