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MALPEDIA_Win_Xtinyloader_Auto

autogenerated rule brought to you by yara-signator

MalwareXtinyloaderMalpedia 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: Xtinyloader.

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

Summary generated from the rule's metadata and condition.

Rule source

win-xtinyloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Xtinyloader_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "0f3f3fc1-1972-5fbe-93dc-e960b14ce813"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xtinyloader"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.xtinyloader_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "871e75fa34499427fd023811dff4e0c8c69560f4bfd8df1c057ed2bb040f0585"
		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 = { c3 3bfb 7615 8b4d08 2bce 8bd7 8a1c01 }
		$sequence_1 = { ff15???????? 43 83fb05 72e7 56 ff15???????? 85c0 }
		$sequence_2 = { 56 33f6 57 397508 0f84da000000 0fb605???????? 50 }
		$sequence_3 = { ff35???????? ff35???????? e8???????? 50 53 ff15???????? 83c414 }
		$sequence_4 = { 393d???????? 0f8459010000 393d???????? 0f844d010000 393d???????? }
		$sequence_5 = { ff15???????? eb8e 53 56 ff15???????? 8b4c240c 0fb719 }
		$sequence_6 = { 83c40c 3bde 750a 57 ff15???????? }
		$sequence_7 = { a1???????? 85c0 746a 8d4dbc 51 ffd0 66837dbc09 }
		$sequence_8 = { 894508 ff15???????? 397508 75cd }
		$sequence_9 = { 59 6a5c 6689480a 59 }

	condition:
		7 of them and filesize < 50176
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ c3 3bfb 7615 8b4d08 2bce 8bd7 8a1c01 }
$sequence_1hex{ ff15???????? 43 83fb05 72e7 56 ff15???????? 85c0 }
$sequence_2hex{ 56 33f6 57 397508 0f84da000000 0fb605???????? 50 }
$sequence_3hex{ ff35???????? ff35???????? e8???????? 50 53 ff15???????? 83c414 }
$sequence_4hex{ 393d???????? 0f8459010000 393d???????? 0f844d010000 393d???????? }
$sequence_5hex{ ff15???????? eb8e 53 56 ff15???????? 8b4c240c 0fb719 }
$sequence_6hex{ 83c40c 3bde 750a 57 ff15???????? }
$sequence_7hex{ a1???????? 85c0 746a 8d4dbc 51 ffd0 66837dbc09 }
$sequence_8hex{ 894508 ff15???????? 397508 75cd }
$sequence_9hex{ 59 6a5c 6689480a 59 }

Condition

7 of them and filesize < 50176

In plain words (Heuristic)

  • The file must be smaller than 50176 (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: 0f3f3fc1-1972-5fbe-93dc-e960b14ce813

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