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MALPEDIA_Win_Fanny_Auto

autogenerated rule brought to you by yara-signator

MalwareFannyMalpedia 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: Fanny.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-fanny-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Fanny_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "dbb0395a-ca15-563e-b8e4-a7ab0a53715c"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.fanny"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fanny_auto.yar#L1-L171"
		license_url = "N/A"
		logic_hash = "601e37491eb3a0e87730fa782a18e149e4d2bb3c764bdd091220d2b1382b3a57"
		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 = { 8d4508 50 683f000f00 8d458c }
		$sequence_1 = { 750e 8b55c8 0fb64201 83f825 7502 }
		$sequence_2 = { aa 885c241b 895c2430 895c2444 c744243c02000000 8974242c }
		$sequence_3 = { 85f6 7438 ff7604 ff15???????? 8bd8 }
		$sequence_4 = { 8be5 5d c3 66c78594fbffff6600 b903000000 8dbd90fbffff 8db5d0fbffff }
		$sequence_5 = { 7502 eb17 8b45fc 83c00c 50 6a40 }
		$sequence_6 = { 66ab 6a32 aa ffd6 }
		$sequence_7 = { 7364 8bfe 83c9ff f2ae f7d1 }
		$sequence_8 = { 897dfc 740c 57 ff15???????? 8365fc00 }
		$sequence_9 = { 33c0 8dbd92fbffff f3ab 66ab c7858cfbffff00000000 }
		$sequence_10 = { 0f84b8020000 3bfb 0f84b0020000 83ffff 0f84a7020000 83ff01 }
		$sequence_11 = { ffd3 8d45fc 897dfc 50 8d8620010000 50 8d45f8 }
		$sequence_12 = { 8995dcfdffff c785d4fdffff00000000 837d1000 7417 8b4514 50 8b4d10 }
		$sequence_13 = { 50 8b4d08 51 e8???????? 83c40c 894508 }
		$sequence_14 = { 57 85ed c744240c00000000 0f8402010000 }
		$sequence_15 = { aa 6a47 33c0 59 8dbdd5feffff f3ab 66ab }

	condition:
		7 of them and filesize < 368640
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 8d4508 50 683f000f00 8d458c }
$sequence_1hex{ 750e 8b55c8 0fb64201 83f825 7502 }
$sequence_2hex{ aa 885c241b 895c2430 895c2444 c744243c02000000 8974242c }
$sequence_3hex{ 85f6 7438 ff7604 ff15???????? 8bd8 }
$sequence_4hex{ 8be5 5d c3 66c78594fbffff6600 b903000000 8dbd90fbffff 8db5d0fbffff }
$sequence_5hex{ 7502 eb17 8b45fc 83c00c 50 6a40 }
$sequence_6hex{ 66ab 6a32 aa ffd6 }
$sequence_7hex{ 7364 8bfe 83c9ff f2ae f7d1 }
$sequence_8hex{ 897dfc 740c 57 ff15???????? 8365fc00 }
$sequence_9hex{ 33c0 8dbd92fbffff f3ab 66ab c7858cfbffff00000000 }
$sequence_10hex{ 0f84b8020000 3bfb 0f84b0020000 83ffff 0f84a7020000 83ff01 }
$sequence_11hex{ ffd3 8d45fc 897dfc 50 8d8620010000 50 8d45f8 }
$sequence_12hex{ 8995dcfdffff c785d4fdffff00000000 837d1000 7417 8b4514 50 8b4d10 }
$sequence_13hex{ 50 8b4d08 51 e8???????? 83c40c 894508 }
$sequence_14hex{ 57 85ed c744240c00000000 0f8402010000 }
$sequence_15hex{ aa 6a47 33c0 59 8dbdd5feffff f3ab 66ab }

Condition

7 of them and filesize < 368640

In plain words (Heuristic)

  • The file must be smaller than 368640 (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: dbb0395a-ca15-563e-b8e4-a7ab0a53715c

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