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MALPEDIA_Win_Imprudentcook_Auto

autogenerated rule brought to you by yara-signator

MalwareImprudentcookMalpedia 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: Imprudentcook.

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

Summary generated from the rule's metadata and condition.

Rule source

win-imprudentcook-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Imprudentcook_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "75e4592d-21ea-5b74-beda-d75f8caa17c5"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.imprudentcook"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.imprudentcook_auto.yar#L1-L133"
		license_url = "N/A"
		logic_hash = "74810614a85d779678d01380c3bcf3dcf793e759fae3ba5e3f5874f62d02ccb3"
		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 = { e8???????? 488b5520 894500 8b4528 83f803 7527 488b4508 }
		$sequence_1 = { 3b3d???????? 736e 488bdf 4c8bef 49c1fd05 4c8d35384d0200 83e31f }
		$sequence_2 = { 753a 4883e908 48ffc8 79eb 488b8c2498000000 4489642428 4d85f6 }
		$sequence_3 = { 4c2bc1 49c1e020 4d0bc3 4c3bc2 731a 498b45f8 49ffca }
		$sequence_4 = { 4983ec08 493bfd 0f8211020000 4989742408 7732 7563 4d8bcc }
		$sequence_5 = { 4b0104ec 4d85f6 7430 488b4d28 4d8d46ff 498bc4 }
		$sequence_6 = { 482bfa 660f1f440000 488b0c3b 488b13 483bca 0f8599000000 4883eb08 }
		$sequence_7 = { 4c8bc6 48898580000000 e8???????? 48894510 4885c0 7452 660f1f840000000000 }
		$sequence_8 = { 4c8b7c2460 4c8b942408010000 4a8d1c38 4f8d2c12 493bdd 7d41 488b842438010000 }
		$sequence_9 = { 488905???????? e8???????? 488d15d3ec0400 488bcb 488905???????? e8???????? 488d15d5ec0400 }

	condition:
		7 of them and filesize < 864256
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? 488b5520 894500 8b4528 83f803 7527 488b4508 }
$sequence_1hex{ 3b3d???????? 736e 488bdf 4c8bef 49c1fd05 4c8d35384d0200 83e31f }
$sequence_2hex{ 753a 4883e908 48ffc8 79eb 488b8c2498000000 4489642428 4d85f6 }
$sequence_3hex{ 4c2bc1 49c1e020 4d0bc3 4c3bc2 731a 498b45f8 49ffca }
$sequence_4hex{ 4983ec08 493bfd 0f8211020000 4989742408 7732 7563 4d8bcc }
$sequence_5hex{ 4b0104ec 4d85f6 7430 488b4d28 4d8d46ff 498bc4 }
$sequence_6hex{ 482bfa 660f1f440000 488b0c3b 488b13 483bca 0f8599000000 4883eb08 }
$sequence_7hex{ 4c8bc6 48898580000000 e8???????? 48894510 4885c0 7452 660f1f840000000000 }
$sequence_8hex{ 4c8b7c2460 4c8b942408010000 4a8d1c38 4f8d2c12 493bdd 7d41 488b842438010000 }
$sequence_9hex{ 488905???????? e8???????? 488d15d3ec0400 488bcb 488905???????? e8???????? 488d15d5ec0400 }

Condition

7 of them and filesize < 864256

In plain words (Heuristic)

  • The file must be smaller than 864256 (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: 75e4592d-21ea-5b74-beda-d75f8caa17c5

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