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MALPEDIA_Win_Dadjoke_Auto

autogenerated rule brought to you by yara-signator

MalwareDadjokeMalpedia 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 / 73

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Dadjoke.

It defines 23 patterns (0 text, 23 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-dadjoke-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Dadjoke_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "e70c26e7-ab23-539f-9446-f64c119c6dd4"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dadjoke"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.dadjoke_auto.yar#L1-L231"
		license_url = "N/A"
		logic_hash = "52eb13df90c67913476e398c58754b4e8e0394f30601d8e379450da51f4622c9"
		score = 75
		quality = 73
		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 = { 56 57 6800081000 6a00 }
		$sequence_1 = { 894808 8b95ecfeffff 89500c 8b8df0feffff 894810 c745e814000000 }
		$sequence_2 = { 83c201 8955cc 8b45f8 8a08 }
		$sequence_3 = { b941000000 f3a5 8b4dfc 81c104010000 894dfc 8b5508 }
		$sequence_4 = { 8b55ac 895584 894d80 a1???????? 83c0ff 8945c8 }
		$sequence_5 = { e8???????? 8945e8 837de8ff 7533 c645f300 }
		$sequence_6 = { 8b0d???????? 51 e8???????? 83c414 eb1e }
		$sequence_7 = { 6a00 ff15???????? e9???????? 8b4dd4 51 ff15???????? 8be5 }
		$sequence_8 = { 33c9 84c0 0f94c1 8bc1 c3 a1???????? }
		$sequence_9 = { 6a02 ff15???????? 85c0 7417 }
		$sequence_10 = { 5e c3 8bff 55 8bec 83ec10 33c0 }
		$sequence_11 = { e8???????? c3 6a04 e8???????? 59 c3 6a0c }
		$sequence_12 = { 50 e8???????? 83c404 bf3e000000 }
		$sequence_13 = { e8???????? 5e 5d c3 e8???????? 85c0 0f84d5480000 }
		$sequence_14 = { 8d85f8feffff 68???????? 50 e8???????? 6804010000 }
		$sequence_15 = { 85c0 0f85b5000000 50 ff15???????? 8d85e4faffff 50 68???????? }
		$sequence_16 = { 741d 8d4588 50 6800100000 8d041e 50 }
		$sequence_17 = { ff5108 8b3d???????? 8b1d???????? 51 e8???????? }
		$sequence_18 = { 740d 803e4d 7508 807e015a }
		$sequence_19 = { 6800400000 6800004000 56 ffd7 }
		$sequence_20 = { 0f8241ffffff 68???????? e8???????? 8b75fc 83c404 }
		$sequence_21 = { 00f8 e401 00ec e401 00dc e401 00ca }
		$sequence_22 = { 33f6 8b45e4 83f810 720d 40 8d4dd0 50 }

	condition:
		7 of them and filesize < 344064
}

Strings (23 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 56 57 6800081000 6a00 }
$sequence_1hex{ 894808 8b95ecfeffff 89500c 8b8df0feffff 894810 c745e814000000 }
$sequence_2hex{ 83c201 8955cc 8b45f8 8a08 }
$sequence_3hex{ b941000000 f3a5 8b4dfc 81c104010000 894dfc 8b5508 }
$sequence_4hex{ 8b55ac 895584 894d80 a1???????? 83c0ff 8945c8 }
$sequence_5hex{ e8???????? 8945e8 837de8ff 7533 c645f300 }
$sequence_6hex{ 8b0d???????? 51 e8???????? 83c414 eb1e }
$sequence_7hex{ 6a00 ff15???????? e9???????? 8b4dd4 51 ff15???????? 8be5 }
$sequence_8hex{ 33c9 84c0 0f94c1 8bc1 c3 a1???????? }
$sequence_9hex{ 6a02 ff15???????? 85c0 7417 }
$sequence_10hex{ 5e c3 8bff 55 8bec 83ec10 33c0 }
$sequence_11hex{ e8???????? c3 6a04 e8???????? 59 c3 6a0c }
$sequence_12hex{ 50 e8???????? 83c404 bf3e000000 }
$sequence_13hex{ e8???????? 5e 5d c3 e8???????? 85c0 0f84d5480000 }
$sequence_14hex{ 8d85f8feffff 68???????? 50 e8???????? 6804010000 }
$sequence_15hex{ 85c0 0f85b5000000 50 ff15???????? 8d85e4faffff 50 68???????? }
$sequence_16hex{ 741d 8d4588 50 6800100000 8d041e 50 }
$sequence_17hex{ ff5108 8b3d???????? 8b1d???????? 51 e8???????? }
$sequence_18hex{ 740d 803e4d 7508 807e015a }
$sequence_19hex{ 6800400000 6800004000 56 ffd7 }
$sequence_20hex{ 0f8241ffffff 68???????? e8???????? 8b75fc 83c404 }
$sequence_21hex{ 00f8 e401 00ec e401 00dc e401 00ca }
$sequence_22hex{ 33f6 8b45e4 83f810 720d 40 8d4dd0 50 }

Condition

7 of them and filesize < 344064

In plain words (Heuristic)

  • The file must be smaller than 344064 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

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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: e70c26e7-ab23-539f-9446-f64c119c6dd4

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