Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Cloudburst_Auto

autogenerated rule brought to you by yara-signator

MalwareCloudburstMalpedia 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: Cloudburst.

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

Summary generated from the rule's metadata and condition.

Rule source

win-cloudburst-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cloudburst_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "4fea5a25-34b9-567c-918c-c22b7d7d2293"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cloudburst"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cloudburst_auto.yar#L1-L118"
		license_url = "N/A"
		logic_hash = "65e14b7f1000073cb09e0abeccac279ec6677d50dc21e39458d65e135de8cbea"
		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 = { 4433d0 418bc3 c1e818 41c1e208 0fb6c8 }
		$sequence_1 = { 335ef4 4133d8 41895c24f0 448bdb }
		$sequence_2 = { 45894c2410 4133d1 4189542414 448bc2 }
		$sequence_3 = { 0bf8 0fb64202 4d8bf8 440fb6420c 41c1e108 4c8d35a3e5ffff }
		$sequence_4 = { 4533c9 4533c0 4803d8 ff15???????? }
		$sequence_5 = { 418942f8 418b4424fc 418942fc 4183bf0002000001 0f8e3d010000 90 458b4c24e0 }
		$sequence_6 = { 83e00f 3bc2 7407 83e1f0 }
		$sequence_7 = { 410fb640fb 420fb61411 c1e208 0bd0 410fb640fc c1e208 }
		$sequence_8 = { 4c8d4202 458bcd 8905???????? 4c2bda 90 428d048d00000000 41ffc1 }
		$sequence_9 = { 43880c18 ffc3 49ffc0 eb39 0fb6c1 43c6041825 8bc8 }

	condition:
		7 of them and filesize < 2363392
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 4433d0 418bc3 c1e818 41c1e208 0fb6c8 }
$sequence_1hex{ 335ef4 4133d8 41895c24f0 448bdb }
$sequence_2hex{ 45894c2410 4133d1 4189542414 448bc2 }
$sequence_3hex{ 0bf8 0fb64202 4d8bf8 440fb6420c 41c1e108 4c8d35a3e5ffff }
$sequence_4hex{ 4533c9 4533c0 4803d8 ff15???????? }
$sequence_5hex{ 418942f8 418b4424fc 418942fc 4183bf0002000001 0f8e3d010000 90 458b4c24e0 }
$sequence_6hex{ 83e00f 3bc2 7407 83e1f0 }
$sequence_7hex{ 410fb640fb 420fb61411 c1e208 0bd0 410fb640fc c1e208 }
$sequence_8hex{ 4c8d4202 458bcd 8905???????? 4c2bda 90 428d048d00000000 41ffc1 }
$sequence_9hex{ 43880c18 ffc3 49ffc0 eb39 0fb6c1 43c6041825 8bc8 }

Condition

7 of them and filesize < 2363392

In plain words (Heuristic)

  • The file must be smaller than 2363392 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

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: 4fea5a25-34b9-567c-918c-c22b7d7d2293

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