Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Mylobot_Auto

autogenerated rule brought to you by yara-signator

MalwareMylobotMalpedia 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: Mylobot.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-mylobot-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mylobot_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "3367c4b8-2e00-50bb-8106-f7bfa38e7fdb"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mylobot"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mylobot_auto.yar#L1-L168"
		license_url = "N/A"
		logic_hash = "dfa8c9d0c20f16c0183dd13cc15d32e5e1ca0cab59c086be613c6143f9ccb393"
		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 = { ff5068 5f 5e c3 }
		$sequence_1 = { 8981f8000000 55 8d442414 50 68???????? }
		$sequence_2 = { 8938 56 ff15???????? 8bc7 5f 5e }
		$sequence_3 = { 5d c3 8b54240c 8b442404 56 8bf0 }
		$sequence_4 = { a3???????? a1???????? 68???????? 56 56 ff501c }
		$sequence_5 = { ff75f8 ff9100010000 33c0 85f6 7507 837df001 0f94c0 }
		$sequence_6 = { ffd3 8b0d???????? 55 89812c010000 8d442414 50 }
		$sequence_7 = { 50 50 6a1a 50 a1???????? ff9038010000 }
		$sequence_8 = { 51 51 6800000004 51 51 }
		$sequence_9 = { 03c7 8955f8 3bd0 7356 90 }
		$sequence_10 = { 33ff 8bd8 8d8d3af1ffff 33c0 57 51 }
		$sequence_11 = { 57 51 66898538f1ffff e8???????? 83c40c }
		$sequence_12 = { 68fe070000 52 8d8562f7ffff 50 66899560f7ffff }
		$sequence_13 = { 85c0 7477 8b4d08 8b550c }
		$sequence_14 = { 741c 8d431c e8???????? 8b5318 }
		$sequence_15 = { 83f8ff 7554 6a01 6a08 ff15???????? 8d9558f5ffff }

	condition:
		7 of them and filesize < 8028160
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ ff5068 5f 5e c3 }
$sequence_1hex{ 8981f8000000 55 8d442414 50 68???????? }
$sequence_2hex{ 8938 56 ff15???????? 8bc7 5f 5e }
$sequence_3hex{ 5d c3 8b54240c 8b442404 56 8bf0 }
$sequence_4hex{ a3???????? a1???????? 68???????? 56 56 ff501c }
$sequence_5hex{ ff75f8 ff9100010000 33c0 85f6 7507 837df001 0f94c0 }
$sequence_6hex{ ffd3 8b0d???????? 55 89812c010000 8d442414 50 }
$sequence_7hex{ 50 50 6a1a 50 a1???????? ff9038010000 }
$sequence_8hex{ 51 51 6800000004 51 51 }
$sequence_9hex{ 03c7 8955f8 3bd0 7356 90 }
$sequence_10hex{ 33ff 8bd8 8d8d3af1ffff 33c0 57 51 }
$sequence_11hex{ 57 51 66898538f1ffff e8???????? 83c40c }
$sequence_12hex{ 68fe070000 52 8d8562f7ffff 50 66899560f7ffff }
$sequence_13hex{ 85c0 7477 8b4d08 8b550c }
$sequence_14hex{ 741c 8d431c e8???????? 8b5318 }
$sequence_15hex{ 83f8ff 7554 6a01 6a08 ff15???????? 8d9558f5ffff }

Condition

7 of them and filesize < 8028160

In plain words (Heuristic)

  • The file must be smaller than 8028160 (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: 3367c4b8-2e00-50bb-8106-f7bfa38e7fdb

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