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MALPEDIA_Win_Skynet_Auto

autogenerated rule brought to you by yara-signator

MalwareSkynetMalpedia 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: Skynet.

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

Summary generated from the rule's metadata and condition.

Rule source

win-skynet-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Skynet_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "04bd5c06-b419-506b-b9aa-2148b31bf67a"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.skynet"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.skynet_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "f24e2c2841c1f8112cdfb00cc53eb7f1e38d3d1eca9fe92f96c64fe6ba6aed20"
		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 = { 4c29f2 4839da 0f82fc020000 4d39f9 0f8484020000 488b9424a0000000 4839fa }
		$sequence_1 = { 4883c102 0f8818080000 4c8da424a0000000 e8???????? 4c8bbc24a0000000 4989c4 }
		$sequence_2 = { 488d1524788a00 48c7401800000000 48895010 c6402000 c640482e 488b4310 c640492c }
		$sequence_3 = { 4889f3 e8???????? 4c89e9 e8???????? e9???????? 4889d9 4889f3 }
		$sequence_4 = { e8???????? 4883f8ff 0f84b2feffff f30f6f8398000000 488b5370 31c0 }
		$sequence_5 = { 4889ea 4889f1 e8???????? 488b0b 4c8b842488000000 488dbc2490000000 488b842480000000 }
		$sequence_6 = { 5e c3 4989d0 4989d9 488d159e039500 488d0d08039500 e8???????? }
		$sequence_7 = { c7000b000000 48895008 c3 488d1551e89400 c7001b000000 48895008 c3 }
		$sequence_8 = { e9???????? e8???????? 31d2 e9???????? 488d0d4dd29700 e8???????? }
		$sequence_9 = { 89542428 8b5520 89542420 4d89c1 4989c8 89c2 488d0554e09500 }

	condition:
		7 of them and filesize < 20419584
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 4c29f2 4839da 0f82fc020000 4d39f9 0f8484020000 488b9424a0000000 4839fa }
$sequence_1hex{ 4883c102 0f8818080000 4c8da424a0000000 e8???????? 4c8bbc24a0000000 4989c4 }
$sequence_2hex{ 488d1524788a00 48c7401800000000 48895010 c6402000 c640482e 488b4310 c640492c }
$sequence_3hex{ 4889f3 e8???????? 4c89e9 e8???????? e9???????? 4889d9 4889f3 }
$sequence_4hex{ e8???????? 4883f8ff 0f84b2feffff f30f6f8398000000 488b5370 31c0 }
$sequence_5hex{ 4889ea 4889f1 e8???????? 488b0b 4c8b842488000000 488dbc2490000000 488b842480000000 }
$sequence_6hex{ 5e c3 4989d0 4989d9 488d159e039500 488d0d08039500 e8???????? }
$sequence_7hex{ c7000b000000 48895008 c3 488d1551e89400 c7001b000000 48895008 c3 }
$sequence_8hex{ e9???????? e8???????? 31d2 e9???????? 488d0d4dd29700 e8???????? }
$sequence_9hex{ 89542428 8b5520 89542420 4d89c1 4989c8 89c2 488d0554e09500 }

Condition

7 of them and filesize < 20419584

In plain words (Heuristic)

  • The file must be smaller than 20419584 (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: 04bd5c06-b419-506b-b9aa-2148b31bf67a

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