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MALPEDIA_Win_Hotcroissant_Auto

autogenerated rule brought to you by yara-signator

MalwareHotcroissantMalpedia 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: Hotcroissant.

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

Summary generated from the rule's metadata and condition.

Rule source

win-hotcroissant-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Hotcroissant_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "9c03b379-6b63-5f09-aa8b-fbd48eed164c"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.hotcroissant"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.hotcroissant_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "8ff8cec58017b3310f3e99f6bf45a85f3fa651c35cf6576e8ea91c6bb4a11df0"
		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 = { 32da 32d8 32d9 881c3e }
		$sequence_1 = { c705????????00000000 ff15???????? 6a00 c705????????00000000 c705????????00000000 }
		$sequence_2 = { 68???????? 68???????? 68???????? ffd6 a1???????? 85c0 }
		$sequence_3 = { ffd6 a1???????? 85c0 7409 6a01 50 ff15???????? }
		$sequence_4 = { 8be5 5d c3 e8???????? 6a00 c705????????00000000 ff15???????? }
		$sequence_5 = { ffd6 6800040000 68???????? 68???????? 68???????? ffd6 a1???????? }
		$sequence_6 = { ffd6 8b15???????? 52 ffd6 893d???????? 893d???????? 893d???????? }
		$sequence_7 = { 6a00 ffd7 85c0 7506 46 83fe08 }
		$sequence_8 = { 6800000400 68???????? 68???????? 68???????? }
		$sequence_9 = { 6a00 ffd7 85c0 7506 46 83fe08 7cd5 }

	condition:
		7 of them and filesize < 591872
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 32da 32d8 32d9 881c3e }
$sequence_1hex{ c705????????00000000 ff15???????? 6a00 c705????????00000000 c705????????00000000 }
$sequence_2hex{ 68???????? 68???????? 68???????? ffd6 a1???????? 85c0 }
$sequence_3hex{ ffd6 a1???????? 85c0 7409 6a01 50 ff15???????? }
$sequence_4hex{ 8be5 5d c3 e8???????? 6a00 c705????????00000000 ff15???????? }
$sequence_5hex{ ffd6 6800040000 68???????? 68???????? 68???????? ffd6 a1???????? }
$sequence_6hex{ ffd6 8b15???????? 52 ffd6 893d???????? 893d???????? 893d???????? }
$sequence_7hex{ 6a00 ffd7 85c0 7506 46 83fe08 }
$sequence_8hex{ 6800000400 68???????? 68???????? 68???????? }
$sequence_9hex{ 6a00 ffd7 85c0 7506 46 83fe08 7cd5 }

Condition

7 of them and filesize < 591872

In plain words (Heuristic)

  • The file must be smaller than 591872 (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: 9c03b379-6b63-5f09-aa8b-fbd48eed164c

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