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MALPEDIA_Win_Simda_Auto

autogenerated rule brought to you by yara-signator

MalwareSimdaMalpedia 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: Simda.

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

Summary generated from the rule's metadata and condition.

Rule source

win-simda-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Simda_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "aa304c72-72d4-549a-ba4f-f63f8efa0a94"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.simda"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.simda_auto.yar#L1-L117"
		license_url = "N/A"
		logic_hash = "945beb5f8ffd66c84ce2c6df7a6662ff804e95b9a56c15b871a19f21206edd7c"
		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 = { 8b5487fc b900000080 90 85d1 7504 d1e9 }
		$sequence_1 = { 66894df4 8855f6 c685c8fcffff00 e8???????? 6803010000 }
		$sequence_2 = { 51 c685f8feffff00 e8???????? 8b35???????? }
		$sequence_3 = { 40 84c9 75f9 8b4dfc 2bc2 40 50 }
		$sequence_4 = { 8b0c30 3b0e 750d 83ef04 83c604 83ff04 }
		$sequence_5 = { 80f903 7536 8b8de4feffff 83f905 750d 3985e8feffff 7523 }
		$sequence_6 = { 03c7 3bc7 7301 42 }
		$sequence_7 = { 74e4 6a0a 6a00 56 }
		$sequence_8 = { ffd7 8b1d???????? 6a00 6a01 8d8df8feffff }
		$sequence_9 = { 41 eb08 83c102 eb03 83c103 }

	condition:
		7 of them and filesize < 1581056
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8b5487fc b900000080 90 85d1 7504 d1e9 }
$sequence_1hex{ 66894df4 8855f6 c685c8fcffff00 e8???????? 6803010000 }
$sequence_2hex{ 51 c685f8feffff00 e8???????? 8b35???????? }
$sequence_3hex{ 40 84c9 75f9 8b4dfc 2bc2 40 50 }
$sequence_4hex{ 8b0c30 3b0e 750d 83ef04 83c604 83ff04 }
$sequence_5hex{ 80f903 7536 8b8de4feffff 83f905 750d 3985e8feffff 7523 }
$sequence_6hex{ 03c7 3bc7 7301 42 }
$sequence_7hex{ 74e4 6a0a 6a00 56 }
$sequence_8hex{ ffd7 8b1d???????? 6a00 6a01 8d8df8feffff }
$sequence_9hex{ 41 eb08 83c102 eb03 83c103 }

Condition

7 of them and filesize < 1581056

In plain words (Heuristic)

  • The file must be smaller than 1581056 (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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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

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: aa304c72-72d4-549a-ba4f-f63f8efa0a94

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