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MALPEDIA_Win_Xpertrat_Auto

autogenerated rule brought to you by yara-signator

MalwareXpertratMalpedia 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: Xpertrat.

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

Summary generated from the rule's metadata and condition.

Rule source

win-xpertrat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Xpertrat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "ba3a6b4f-dabd-5198-a8f0-bcecdc7a8cd1"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xpertrat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.xpertrat_auto.yar#L1-L159"
		license_url = "N/A"
		logic_hash = "46ada561a557d5653f02082143df27ce692fd4a3b6839f44225d1aa292544237"
		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 = { ff08 40 0430 ff0a 4c 000c00 }
		$sequence_1 = { 008a3800cc1c 5e 006c70ff 0808 008f38001b26 001b 0d002a2364 }
		$sequence_2 = { 001b 0d002a2364 ff08 0800 }
		$sequence_3 = { ff05???????? 000d???????? 0878ff 0d98000700 6e 74ff }
		$sequence_4 = { 000d???????? 0870ff 0d80000700 0474 ff0478 }
		$sequence_5 = { 0000 ae 045c ff4d40 ff08 40 }
		$sequence_6 = { 0000 00a1cc004400 0bc0 7402 }
		$sequence_7 = { 6c 70ff 0808 008a3800cc1c }
		$sequence_8 = { ff15???????? 83bbd800000001 8d83fc000000 898534f6ffff }
		$sequence_9 = { ff15???????? 83bd1cffffff00 7505 e9???????? }
		$sequence_10 = { ff15???????? 83bd8cfeffff00 0f84b0050000 c745fc0a000000 }
		$sequence_11 = { ff15???????? 83bd8cfeffff00 7405 e9???????? }
		$sequence_12 = { ff15???????? 83bd70ffffff00 0f84ca010000 c745fc1a000000 }
		$sequence_13 = { ff15???????? 83bbd800000001 0f8546010000 8d4dd8 }
		$sequence_14 = { ff15???????? 83bc24a000000005 7c0c 5f }
		$sequence_15 = { ff15???????? 83bb9400000001 8d83b8000000 89853cf6ffff 8985b4fcffff c785acfcffff03400000 0f8533010000 }

	condition:
		7 of them and filesize < 8560640
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ ff08 40 0430 ff0a 4c 000c00 }
$sequence_1hex{ 008a3800cc1c 5e 006c70ff 0808 008f38001b26 001b 0d002a2364 }
$sequence_2hex{ 001b 0d002a2364 ff08 0800 }
$sequence_3hex{ ff05???????? 000d???????? 0878ff 0d98000700 6e 74ff }
$sequence_4hex{ 000d???????? 0870ff 0d80000700 0474 ff0478 }
$sequence_5hex{ 0000 ae 045c ff4d40 ff08 40 }
$sequence_6hex{ 0000 00a1cc004400 0bc0 7402 }
$sequence_7hex{ 6c 70ff 0808 008a3800cc1c }
$sequence_8hex{ ff15???????? 83bbd800000001 8d83fc000000 898534f6ffff }
$sequence_9hex{ ff15???????? 83bd1cffffff00 7505 e9???????? }
$sequence_10hex{ ff15???????? 83bd8cfeffff00 0f84b0050000 c745fc0a000000 }
$sequence_11hex{ ff15???????? 83bd8cfeffff00 7405 e9???????? }
$sequence_12hex{ ff15???????? 83bd70ffffff00 0f84ca010000 c745fc1a000000 }
$sequence_13hex{ ff15???????? 83bbd800000001 0f8546010000 8d4dd8 }
$sequence_14hex{ ff15???????? 83bc24a000000005 7c0c 5f }
$sequence_15hex{ ff15???????? 83bb9400000001 8d83b8000000 89853cf6ffff 8985b4fcffff c785acfcffff03400000 0f8533010000 }

Condition

7 of them and filesize < 8560640

In plain words (Heuristic)

  • The file must be smaller than 8560640 (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: ba3a6b4f-dabd-5198-a8f0-bcecdc7a8cd1

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