YARA · Malpedia signator rules
MALPEDIA_Win_Fanny_Auto
autogenerated rule brought to you by yara-signator
- 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:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "dbb0395a-ca15-563e-b8e4-a7ab0a53715c"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.fanny"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fanny_auto.yar#L1-L171"
= "N/A"
= "601e37491eb3a0e87730fa782a18e149e4d2bb3c764bdd091220d2b1382b3a57"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "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)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8d4508 50 683f000f00 8d458c } | |
| $sequence_1 | hex | { 750e 8b55c8 0fb64201 83f825 7502 } | |
| $sequence_2 | hex | { aa 885c241b 895c2430 895c2444 c744243c02000000 8974242c } | |
| $sequence_3 | hex | { 85f6 7438 ff7604 ff15???????? 8bd8 } | |
| $sequence_4 | hex | { 8be5 5d c3 66c78594fbffff6600 b903000000 8dbd90fbffff 8db5d0fbffff } | |
| $sequence_5 | hex | { 7502 eb17 8b45fc 83c00c 50 6a40 } | |
| $sequence_6 | hex | { 66ab 6a32 aa ffd6 } | |
| $sequence_7 | hex | { 7364 8bfe 83c9ff f2ae f7d1 } | |
| $sequence_8 | hex | { 897dfc 740c 57 ff15???????? 8365fc00 } | |
| $sequence_9 | hex | { 33c0 8dbd92fbffff f3ab 66ab c7858cfbffff00000000 } | |
| $sequence_10 | hex | { 0f84b8020000 3bfb 0f84b0020000 83ffff 0f84a7020000 83ff01 } | |
| $sequence_11 | hex | { ffd3 8d45fc 897dfc 50 8d8620010000 50 8d45f8 } | |
| $sequence_12 | hex | { 8995dcfdffff c785d4fdffff00000000 837d1000 7417 8b4514 50 8b4d10 } | |
| $sequence_13 | hex | { 50 8b4d08 51 e8???????? 83c40c 894508 } | |
| $sequence_14 | hex | { 57 85ed c744240c00000000 0f8402010000 } | |
| $sequence_15 | hex | { aa 6a47 33c0 59 8dbdd5feffff f3ab 66ab } |
Condition
7 of them and filesize < 368640In 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.
Test this rule in your browser
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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)
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
| 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 |
Tags:FILE
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