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MALPEDIA_Win_Asprox_Auto

autogenerated rule brought to you by yara-signator

MalwareAsproxMalpedia 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: Asprox.

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

Summary generated from the rule's metadata and condition.

Rule source

win-asprox-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Asprox_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "2f74538e-f933-5aef-aa2f-b7ab3bb0119c"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.asprox"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.asprox_auto.yar#L1-L127"
		license_url = "N/A"
		logic_hash = "a6a9230d1bd8a95689910db672c674c35c5bb3455366aaba88aa83587782dde4"
		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 = { 0f84a1000000 0fb69567fcffff 85d2 0f8592000000 c68567fcffff01 8d85e8fdffff 50 }
		$sequence_1 = { c685d5feffff65 c685d6feffff74 c685d7feffff50 c685d8feffff72 c685d9feffff6f c685dafeffff63 c685dbfeffff41 }
		$sequence_2 = { 52 6a00 a1???????? 50 ff15???????? 8b4df8 51 }
		$sequence_3 = { 8b450c 0345fc 0fb608 0bca 8b550c 0355fc 880a }
		$sequence_4 = { ff15???????? 898558ffffff 8b5580 8b4580 03423c }
		$sequence_5 = { 53 6a02 5b 8b4e04 49 0f84d8000000 49 }
		$sequence_6 = { 8b450c 50 ff15???????? 83c404 50 8b4d0c 51 }
		$sequence_7 = { c685dafeffff63 c685dbfeffff41 c685dcfeffff64 c685ddfeffff64 }
		$sequence_8 = { 6a00 6a00 8d8560ffffff 50 8b8d5cffffff }
		$sequence_9 = { 6890000000 8d8d10ffffff 51 8b9548fdffff 52 8b45c0 50 }

	condition:
		7 of them and filesize < 155648
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 0f84a1000000 0fb69567fcffff 85d2 0f8592000000 c68567fcffff01 8d85e8fdffff 50 }
$sequence_1hex{ c685d5feffff65 c685d6feffff74 c685d7feffff50 c685d8feffff72 c685d9feffff6f c685dafeffff63 c685dbfeffff41 }
$sequence_2hex{ 52 6a00 a1???????? 50 ff15???????? 8b4df8 51 }
$sequence_3hex{ 8b450c 0345fc 0fb608 0bca 8b550c 0355fc 880a }
$sequence_4hex{ ff15???????? 898558ffffff 8b5580 8b4580 03423c }
$sequence_5hex{ 53 6a02 5b 8b4e04 49 0f84d8000000 49 }
$sequence_6hex{ 8b450c 50 ff15???????? 83c404 50 8b4d0c 51 }
$sequence_7hex{ c685dafeffff63 c685dbfeffff41 c685dcfeffff64 c685ddfeffff64 }
$sequence_8hex{ 6a00 6a00 8d8560ffffff 50 8b8d5cffffff }
$sequence_9hex{ 6890000000 8d8d10ffffff 51 8b9548fdffff 52 8b45c0 50 }

Condition

7 of them and filesize < 155648

In plain words (Heuristic)

  • The file must be smaller than 155648 (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: 2f74538e-f933-5aef-aa2f-b7ab3bb0119c

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