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MALPEDIA_Win_Xfsadm_Auto

autogenerated rule brought to you by yara-signator

MalwareXfsadmMalpedia 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: Xfsadm.

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

Summary generated from the rule's metadata and condition.

Rule source

win-xfsadm-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Xfsadm_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "552d6194-4917-5d44-9757-a3d6f70fd0c0"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xfsadm"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.xfsadm_auto.yar#L1-L125"
		license_url = "N/A"
		logic_hash = "0bd192351fc03846117b638fe2e0016827c857e0d506d55fb4904ab3035a6f66"
		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 = { 84c9 7410 c60720 47 8a06 46 8807 }
		$sequence_1 = { 8975cc 8975d0 8975e0 8d1c85fcffffff c745e4d8254200 }
		$sequence_2 = { 6a00 ffd7 85c0 740c 6a00 6a00 }
		$sequence_3 = { 6a26 58 0fb60c858e174200 0fb634858f174200 8bf9 8985b0f8ffff c1e702 }
		$sequence_4 = { e8???????? 83c414 57 e8???????? a1???????? 83c404 }
		$sequence_5 = { e8???????? 68f80f0000 8bf8 6a00 }
		$sequence_6 = { 75d3 8b4d08 ff7718 6a00 51 8b4f04 6a0a }
		$sequence_7 = { 57 6a00 6a00 6a00 6a00 6a00 680cfeffff }
		$sequence_8 = { ff5008 8bd0 c702???????? 8b45fc 8b4d0c 894204 }
		$sequence_9 = { c7463800000000 8d4608 c7463c00000000 c7464000000000 c7464400000000 c7464800000000 }

	condition:
		7 of them and filesize < 566272
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 84c9 7410 c60720 47 8a06 46 8807 }
$sequence_1hex{ 8975cc 8975d0 8975e0 8d1c85fcffffff c745e4d8254200 }
$sequence_2hex{ 6a00 ffd7 85c0 740c 6a00 6a00 }
$sequence_3hex{ 6a26 58 0fb60c858e174200 0fb634858f174200 8bf9 8985b0f8ffff c1e702 }
$sequence_4hex{ e8???????? 83c414 57 e8???????? a1???????? 83c404 }
$sequence_5hex{ e8???????? 68f80f0000 8bf8 6a00 }
$sequence_6hex{ 75d3 8b4d08 ff7718 6a00 51 8b4f04 6a0a }
$sequence_7hex{ 57 6a00 6a00 6a00 6a00 6a00 680cfeffff }
$sequence_8hex{ ff5008 8bd0 c702???????? 8b45fc 8b4d0c 894204 }
$sequence_9hex{ c7463800000000 8d4608 c7463c00000000 c7464000000000 c7464400000000 c7464800000000 }

Condition

7 of them and filesize < 566272

In plain words (Heuristic)

  • The file must be smaller than 566272 (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: 552d6194-4917-5d44-9757-a3d6f70fd0c0

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