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MALPEDIA_Win_Cycbot_Auto

autogenerated rule brought to you by yara-signator

MalwareCycbotMalpedia 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: Cycbot.

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

Summary generated from the rule's metadata and condition.

Rule source

win-cycbot-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cycbot_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "fa04896a-3166-5fe4-a6d5-dcaeaa662dc7"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cycbot"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cycbot_auto.yar#L1-L132"
		license_url = "N/A"
		logic_hash = "23fb15c77ba00892df9991b6749b20d3b9f3215c21d5ff20efa2a5f792d371c4"
		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 = { 59 59 85c0 7430 ffb730f8ffff ff15???????? }
		$sequence_1 = { 81bd7cf5ffff90010000 742a ffb57cf5ffff 8d8584f5ffff ffb56cf5ffff 68???????? 68???????? }
		$sequence_2 = { 8d4df4 c7450800000000 e8???????? 68???????? 8d4df4 51 c745f4e0634300 }
		$sequence_3 = { 0f8519020000 39842414010000 0f850c020000 39442420 0f8402020000 8d842420010000 50 }
		$sequence_4 = { 83c40c 33c9 c705????????f0874800 c705????????e8864800 c705????????e0854800 e8???????? 50 }
		$sequence_5 = { 8d9568ffffff 52 50 53 ff511c 8bf0 33ff }
		$sequence_6 = { 8908 895804 eb02 33c0 6a08 8945fc e8???????? }
		$sequence_7 = { a5 66a5 a4 8b5d0c 8b4508 be???????? 8d7d94 }
		$sequence_8 = { 8d8518ffffff 50 8d85f0feffff 50 8d8528ffffff 50 8d8508ffffff }
		$sequence_9 = { 53 e8???????? 59 e8???????? cc 6a4c }

	condition:
		7 of them and filesize < 1163264
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 59 59 85c0 7430 ffb730f8ffff ff15???????? }
$sequence_1hex{ 81bd7cf5ffff90010000 742a ffb57cf5ffff 8d8584f5ffff ffb56cf5ffff 68???????? 68???????? }
$sequence_2hex{ 8d4df4 c7450800000000 e8???????? 68???????? 8d4df4 51 c745f4e0634300 }
$sequence_3hex{ 0f8519020000 39842414010000 0f850c020000 39442420 0f8402020000 8d842420010000 50 }
$sequence_4hex{ 83c40c 33c9 c705????????f0874800 c705????????e8864800 c705????????e0854800 e8???????? 50 }
$sequence_5hex{ 8d9568ffffff 52 50 53 ff511c 8bf0 33ff }
$sequence_6hex{ 8908 895804 eb02 33c0 6a08 8945fc e8???????? }
$sequence_7hex{ a5 66a5 a4 8b5d0c 8b4508 be???????? 8d7d94 }
$sequence_8hex{ 8d8518ffffff 50 8d85f0feffff 50 8d8528ffffff 50 8d8508ffffff }
$sequence_9hex{ 53 e8???????? 59 e8???????? cc 6a4c }

Condition

7 of them and filesize < 1163264

In plain words (Heuristic)

  • The file must be smaller than 1163264 (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: fa04896a-3166-5fe4-a6d5-dcaeaa662dc7

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