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MALPEDIA_Win_Mirrorkey_Auto

autogenerated rule brought to you by yara-signator

MalwareMirrorkeyMalpedia 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: Mirrorkey.

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

Summary generated from the rule's metadata and condition.

Rule source

win-mirrorkey-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mirrorkey_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "0eb308b5-3815-5b9c-81c4-a78cbb0d1b3d"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mirrorkey"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mirrorkey_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "8d65dba7f9bead9137a917a1b3b1727a25c3d194aa105ebabd30da323bba34f8"
		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 = { 5d c20800 e9???????? 3b0d???????? f27502 f2c3 f2e9ca030000 }
		$sequence_1 = { 57 8b13 0f57c0 8b7d0c 83c2e0 50 }
		$sequence_2 = { 8b06 eb02 8bc6 c60000 c745fc00000000 8bce a1???????? }
		$sequence_3 = { 68???????? ff15???????? 57 8b7d18 }
		$sequence_4 = { 6aff 6a00 56 8d4db8 c745cc0f000000 c745c800000000 c645b800 }
		$sequence_5 = { 50 e8???????? ff75fc 8d45fc ff75f8 50 }
		$sequence_6 = { 51 e8???????? ff7004 ff30 ff15???????? 83c41c }
		$sequence_7 = { 56 ff15???????? 5f 5e c7430400000000 }
		$sequence_8 = { 46 3bf3 7ccf 8b4dfc }
		$sequence_9 = { 85c0 7405 8a0c06 eb03 8a4ef4 }

	condition:
		7 of them and filesize < 117760
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 5d c20800 e9???????? 3b0d???????? f27502 f2c3 f2e9ca030000 }
$sequence_1hex{ 57 8b13 0f57c0 8b7d0c 83c2e0 50 }
$sequence_2hex{ 8b06 eb02 8bc6 c60000 c745fc00000000 8bce a1???????? }
$sequence_3hex{ 68???????? ff15???????? 57 8b7d18 }
$sequence_4hex{ 6aff 6a00 56 8d4db8 c745cc0f000000 c745c800000000 c645b800 }
$sequence_5hex{ 50 e8???????? ff75fc 8d45fc ff75f8 50 }
$sequence_6hex{ 51 e8???????? ff7004 ff30 ff15???????? 83c41c }
$sequence_7hex{ 56 ff15???????? 5f 5e c7430400000000 }
$sequence_8hex{ 46 3bf3 7ccf 8b4dfc }
$sequence_9hex{ 85c0 7405 8a0c06 eb03 8a4ef4 }

Condition

7 of them and filesize < 117760

In plain words (Heuristic)

  • The file must be smaller than 117760 (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: 0eb308b5-3815-5b9c-81c4-a78cbb0d1b3d

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