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MALPEDIA_Win_Avast_Disabler_Auto

autogenerated rule brought to you by yara-signator

MalwareAvast DisablerMalpedia 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: Avast Disabler.

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

Summary generated from the rule's metadata and condition.

Rule source

win-avast-disabler-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Avast_Disabler_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "6a09cca4-7cb6-5c97-b15b-4f7311a6621b"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.avast_disabler"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.avast_disabler_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "19754a7bc503b1b28bdfc059b6eb230f6f3e29b2e990d8ace51bd954a83ec439"
		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 = { 85c0 7404 3bc1 7515 0f31 35???????? }
		$sequence_1 = { 7534 837c371400 752d 89443714 6a08 8d45f4 50 }
		$sequence_2 = { b94ee640bb 85c0 7404 3bc1 7515 }
		$sequence_3 = { 2b4c3718 51 53 53 50 e8???????? 8b4dfc }
		$sequence_4 = { 50 ff15???????? 6a01 8d45f8 50 ff750c ff15???????? }
		$sequence_5 = { 33c0 40 394510 7534 837c371400 752d }
		$sequence_6 = { 8b5c3718 83c112 03d9 837d1000 }
		$sequence_7 = { 75a9 5f 5e 5b 5d c21000 55 }
		$sequence_8 = { 51 803d????????00 7520 c605????????01 }
		$sequence_9 = { 5f 5e 5b 8be5 5d c20c00 3b0d???????? }

	condition:
		7 of them and filesize < 41984
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 85c0 7404 3bc1 7515 0f31 35???????? }
$sequence_1hex{ 7534 837c371400 752d 89443714 6a08 8d45f4 50 }
$sequence_2hex{ b94ee640bb 85c0 7404 3bc1 7515 }
$sequence_3hex{ 2b4c3718 51 53 53 50 e8???????? 8b4dfc }
$sequence_4hex{ 50 ff15???????? 6a01 8d45f8 50 ff750c ff15???????? }
$sequence_5hex{ 33c0 40 394510 7534 837c371400 752d }
$sequence_6hex{ 8b5c3718 83c112 03d9 837d1000 }
$sequence_7hex{ 75a9 5f 5e 5b 5d c21000 55 }
$sequence_8hex{ 51 803d????????00 7520 c605????????01 }
$sequence_9hex{ 5f 5e 5b 8be5 5d c20c00 3b0d???????? }

Condition

7 of them and filesize < 41984

In plain words (Heuristic)

  • The file must be smaller than 41984 (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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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: 6a09cca4-7cb6-5c97-b15b-4f7311a6621b

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