YARA · Malpedia signator rules
MALPEDIA_Win_Bookcodesrat_Auto
autogenerated rule brought to you by yara-signator
MalwareBookcodesratMalpedia 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: Bookcodesrat.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-bookcodesrat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Bookcodesrat_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "4898aabc-f745-5eeb-b868-8989a59790fe"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.bookcodesrat"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.bookcodesrat_auto.yar#L1-L131"
= "N/A"
= "6a54c3bffa90c7116007b02d093cebae2be27970e91c5ba26d7c33c2fea354c6"
= 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 = { 488dbb40080000 66f2af 48f7d1 48ffc9 750d b960ea0000 ff9360360000 }
$sequence_1 = { 85c0 750d ff15???????? 418985a8010000 84db 7431 c744245002000000 }
$sequence_2 = { 735e 4d85ed 488b5c2420 0f8432feffff 498bdd }
$sequence_3 = { 41ffd7 8b5d10 8b7d00 4903dc 4903fc 488bf0 48833b00 }
$sequence_4 = { 48897330 ebad 48ff4b48 33c0 eb0d 488b4328 }
$sequence_5 = { ff15???????? 488d9508080000 488bcf 488983f8360000 ff15???????? 488d5598 488bcf }
$sequence_6 = { ff15???????? 488bf0 4885c0 0f8493010000 488d1556320100 488bc8 ff15???????? }
$sequence_7 = { 488d0de3780200 8905???????? 488d051ee40100 4889442458 e8???????? 488d0d09a00100 48891d???????? }
$sequence_8 = { 4053 4881ecb0030000 48c7442420feffffff 488bd9 488d8c24f0010000 488d93f0350000 41b8b8010000 }
$sequence_9 = { 498bd4 4c3b6310 720b b957000780 e8???????? cc 4863c8 }
condition:
7 of them and filesize < 544768
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 488dbb40080000 66f2af 48f7d1 48ffc9 750d b960ea0000 ff9360360000 } | |
| $sequence_1 | hex | { 85c0 750d ff15???????? 418985a8010000 84db 7431 c744245002000000 } | |
| $sequence_2 | hex | { 735e 4d85ed 488b5c2420 0f8432feffff 498bdd } | |
| $sequence_3 | hex | { 41ffd7 8b5d10 8b7d00 4903dc 4903fc 488bf0 48833b00 } | |
| $sequence_4 | hex | { 48897330 ebad 48ff4b48 33c0 eb0d 488b4328 } | |
| $sequence_5 | hex | { ff15???????? 488d9508080000 488bcf 488983f8360000 ff15???????? 488d5598 488bcf } | |
| $sequence_6 | hex | { ff15???????? 488bf0 4885c0 0f8493010000 488d1556320100 488bc8 ff15???????? } | |
| $sequence_7 | hex | { 488d0de3780200 8905???????? 488d051ee40100 4889442458 e8???????? 488d0d09a00100 48891d???????? } | |
| $sequence_8 | hex | { 4053 4881ecb0030000 48c7442420feffffff 488bd9 488d8c24f0010000 488d93f0350000 41b8b8010000 } | |
| $sequence_9 | hex | { 498bd4 4c3b6310 720b b957000780 e8???????? cc 4863c8 } |
Condition
7 of them and filesize < 544768In plain words (Heuristic)
- The file must be smaller than 544768 (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: 4898aabc-f745-5eeb-b868-8989a59790fe
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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