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MALPEDIA_Win_Sasfis_Auto

autogenerated rule brought to you by yara-signator

MalwareSasfisMalpedia 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: Sasfis.

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

Summary generated from the rule's metadata and condition.

Rule source

win-sasfis-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Sasfis_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "faa37fe5-b8ae-5b3d-8761-9ca44fa700a7"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sasfis"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.sasfis_auto.yar#L1-L121"
		license_url = "N/A"
		logic_hash = "cf32d2a1a7d6bbcae913d88ae0d2c6c9327ff9b8dad43d2e492ba8c00cbedd6a"
		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 = { 241c 2c05 006188 c526 3503007ca3 ef 2b30 }
		$sequence_1 = { 0bb2ea7632d3 728b 896b90 35d0797819 d581 }
		$sequence_2 = { 880c24 8d642450 e9???????? 60 }
		$sequence_3 = { 8f44241c f9 66ffc7 0fbdfa 80fe07 87742418 660fbafe06 }
		$sequence_4 = { 036e20 43 7465 47 }
		$sequence_5 = { 2030 51 090a 4d 1321 }
		$sequence_6 = { 66893c24 89442434 9c 660fbef8 9c 89542438 68d58c61ca }
		$sequence_7 = { 660fbec2 660fb6c0 8b4500 e8???????? 661584f0 fec0 27 }
		$sequence_8 = { 7aae 2931 55 3cf4 b729 0300 47 }
		$sequence_9 = { 9c 8f442440 8d3cfd9c379c8f 66ffcf }

	condition:
		7 of them and filesize < 8060928
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 241c 2c05 006188 c526 3503007ca3 ef 2b30 }
$sequence_1hex{ 0bb2ea7632d3 728b 896b90 35d0797819 d581 }
$sequence_2hex{ 880c24 8d642450 e9???????? 60 }
$sequence_3hex{ 8f44241c f9 66ffc7 0fbdfa 80fe07 87742418 660fbafe06 }
$sequence_4hex{ 036e20 43 7465 47 }
$sequence_5hex{ 2030 51 090a 4d 1321 }
$sequence_6hex{ 66893c24 89442434 9c 660fbef8 9c 89542438 68d58c61ca }
$sequence_7hex{ 660fbec2 660fb6c0 8b4500 e8???????? 661584f0 fec0 27 }
$sequence_8hex{ 7aae 2931 55 3cf4 b729 0300 47 }
$sequence_9hex{ 9c 8f442440 8d3cfd9c379c8f 66ffcf }

Condition

7 of them and filesize < 8060928

In plain words (Heuristic)

  • The file must be smaller than 8060928 (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: faa37fe5-b8ae-5b3d-8761-9ca44fa700a7

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