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MALPEDIA_Win_Starcruft_Auto

autogenerated rule brought to you by yara-signator

MalwareStarcruftMalpedia 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: Starcruft.

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

Summary generated from the rule's metadata and condition.

Rule source

win-starcruft-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Starcruft_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "dc096f6e-ea1d-5470-8866-51bf722773fb"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.starcruft"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.starcruft_auto.yar#L1-L127"
		license_url = "N/A"
		logic_hash = "b72b8384869c2c954f191bce498484c3530f8a31a3f0457ad539656016382ef9"
		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 = { 66890c4500e82e00 40 ebe8 33c0 8945e4 3d01010000 }
		$sequence_1 = { 837df000 740d 8b4df0 e8???????? 8945e4 eb07 c745e400000000 }
		$sequence_2 = { e8???????? 83c410 8b4d28 c70103800000 0fb65534 }
		$sequence_3 = { 51 8d55f8 52 8d45f4 50 8b0d???????? 51 }
		$sequence_4 = { e8???????? 83c40c 6804010000 8d85ecfdffff 50 8d8df0feffff }
		$sequence_5 = { 50 e8???????? 83c408 eb6a 6804010000 8b0d???????? 51 }
		$sequence_6 = { c68567fbffffe9 c68568fbffff0d c68569fbffff0c c6856afbffff53 c6856bfbffffeb c6856cfbffff14 c6856dfbffff9c }
		$sequence_7 = { 89853cfeffff 83bd3cfeffff00 7407 32c0 e9???????? 8b5508 }
		$sequence_8 = { 8d8dc8f4ffff 51 8b95ccfcffff 52 ff15???????? 6a00 8d856cf2ffff }
		$sequence_9 = { 83ec0c c745f801000000 68c8000000 e8???????? 83c404 }

	condition:
		7 of them and filesize < 294912
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 66890c4500e82e00 40 ebe8 33c0 8945e4 3d01010000 }
$sequence_1hex{ 837df000 740d 8b4df0 e8???????? 8945e4 eb07 c745e400000000 }
$sequence_2hex{ e8???????? 83c410 8b4d28 c70103800000 0fb65534 }
$sequence_3hex{ 51 8d55f8 52 8d45f4 50 8b0d???????? 51 }
$sequence_4hex{ e8???????? 83c40c 6804010000 8d85ecfdffff 50 8d8df0feffff }
$sequence_5hex{ 50 e8???????? 83c408 eb6a 6804010000 8b0d???????? 51 }
$sequence_6hex{ c68567fbffffe9 c68568fbffff0d c68569fbffff0c c6856afbffff53 c6856bfbffffeb c6856cfbffff14 c6856dfbffff9c }
$sequence_7hex{ 89853cfeffff 83bd3cfeffff00 7407 32c0 e9???????? 8b5508 }
$sequence_8hex{ 8d8dc8f4ffff 51 8b95ccfcffff 52 ff15???????? 6a00 8d856cf2ffff }
$sequence_9hex{ 83ec0c c745f801000000 68c8000000 e8???????? 83c404 }

Condition

7 of them and filesize < 294912

In plain words (Heuristic)

  • The file must be smaller than 294912 (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: dc096f6e-ea1d-5470-8866-51bf722773fb

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