Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Babyshark_Auto

autogenerated rule brought to you by yara-signator

MalwareBabysharkMalpedia 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: Babyshark.

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

Summary generated from the rule's metadata and condition.

Rule source

win-babyshark-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Babyshark_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "bba62dea-b8fb-5177-af59-ee7484609223"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.babyshark"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.babyshark_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "170a55c792dd841a430b5276e4b7ea8cd0c0e2d28c406b503a22728951bd6c1d"
		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 = { 83c40c 8d4c2404 6a00 51 ffd6 6a00 }
		$sequence_1 = { 8bc8 83e01f c1f905 8b0c8d607e4000 8a44c104 83e040 }
		$sequence_2 = { 8b0c8d607e4000 8a44c104 83e040 c3 a1???????? }
		$sequence_3 = { bf???????? f3ab 8d3452 895dfc c1e604 aa 8d9ec8674000 }
		$sequence_4 = { 80e920 ebe0 80a0206c400000 40 3bc6 72be 5e }
		$sequence_5 = { 8db6bc674000 bf???????? a5 a5 59 a3???????? }
		$sequence_6 = { 8a8094504000 83e00f eb02 33c0 0fbe84c6b4504000 }
		$sequence_7 = { c1f804 83f807 8945d0 0f879a060000 ff2485271a4000 834df0ff }
		$sequence_8 = { 5e 8d0c8dc8614000 3bc1 7304 3910 7402 }
		$sequence_9 = { ff15???????? 8bf0 68???????? 8d442408 68???????? 50 }

	condition:
		7 of them and filesize < 65272
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83c40c 8d4c2404 6a00 51 ffd6 6a00 }
$sequence_1hex{ 8bc8 83e01f c1f905 8b0c8d607e4000 8a44c104 83e040 }
$sequence_2hex{ 8b0c8d607e4000 8a44c104 83e040 c3 a1???????? }
$sequence_3hex{ bf???????? f3ab 8d3452 895dfc c1e604 aa 8d9ec8674000 }
$sequence_4hex{ 80e920 ebe0 80a0206c400000 40 3bc6 72be 5e }
$sequence_5hex{ 8db6bc674000 bf???????? a5 a5 59 a3???????? }
$sequence_6hex{ 8a8094504000 83e00f eb02 33c0 0fbe84c6b4504000 }
$sequence_7hex{ c1f804 83f807 8945d0 0f879a060000 ff2485271a4000 834df0ff }
$sequence_8hex{ 5e 8d0c8dc8614000 3bc1 7304 3910 7402 }
$sequence_9hex{ ff15???????? 8bf0 68???????? 8d442408 68???????? 50 }

Condition

7 of them and filesize < 65272

In plain words (Heuristic)

  • The file must be smaller than 65272 (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: bba62dea-b8fb-5177-af59-ee7484609223

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