YARA · Malpedia signator rules
MALPEDIA_Win_Cycbot_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: Cycbot.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-cycbot-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cycbot_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "fa04896a-3166-5fe4-a6d5-dcaeaa662dc7"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.cycbot"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cycbot_auto.yar#L1-L132"
= "N/A"
= "23fb15c77ba00892df9991b6749b20d3b9f3215c21d5ff20efa2a5f792d371c4"
= 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 = { 59 59 85c0 7430 ffb730f8ffff ff15???????? }
$sequence_1 = { 81bd7cf5ffff90010000 742a ffb57cf5ffff 8d8584f5ffff ffb56cf5ffff 68???????? 68???????? }
$sequence_2 = { 8d4df4 c7450800000000 e8???????? 68???????? 8d4df4 51 c745f4e0634300 }
$sequence_3 = { 0f8519020000 39842414010000 0f850c020000 39442420 0f8402020000 8d842420010000 50 }
$sequence_4 = { 83c40c 33c9 c705????????f0874800 c705????????e8864800 c705????????e0854800 e8???????? 50 }
$sequence_5 = { 8d9568ffffff 52 50 53 ff511c 8bf0 33ff }
$sequence_6 = { 8908 895804 eb02 33c0 6a08 8945fc e8???????? }
$sequence_7 = { a5 66a5 a4 8b5d0c 8b4508 be???????? 8d7d94 }
$sequence_8 = { 8d8518ffffff 50 8d85f0feffff 50 8d8528ffffff 50 8d8508ffffff }
$sequence_9 = { 53 e8???????? 59 e8???????? cc 6a4c }
condition:
7 of them and filesize < 1163264
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 59 59 85c0 7430 ffb730f8ffff ff15???????? } | |
| $sequence_1 | hex | { 81bd7cf5ffff90010000 742a ffb57cf5ffff 8d8584f5ffff ffb56cf5ffff 68???????? 68???????? } | |
| $sequence_2 | hex | { 8d4df4 c7450800000000 e8???????? 68???????? 8d4df4 51 c745f4e0634300 } | |
| $sequence_3 | hex | { 0f8519020000 39842414010000 0f850c020000 39442420 0f8402020000 8d842420010000 50 } | |
| $sequence_4 | hex | { 83c40c 33c9 c705????????f0874800 c705????????e8864800 c705????????e0854800 e8???????? 50 } | |
| $sequence_5 | hex | { 8d9568ffffff 52 50 53 ff511c 8bf0 33ff } | |
| $sequence_6 | hex | { 8908 895804 eb02 33c0 6a08 8945fc e8???????? } | |
| $sequence_7 | hex | { a5 66a5 a4 8b5d0c 8b4508 be???????? 8d7d94 } | |
| $sequence_8 | hex | { 8d8518ffffff 50 8d85f0feffff 50 8d8528ffffff 50 8d8508ffffff } | |
| $sequence_9 | hex | { 53 e8???????? 59 e8???????? cc 6a4c } |
Condition
7 of them and filesize < 1163264In plain words (Heuristic)
- The file must be smaller than 1163264 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
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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: fa04896a-3166-5fe4-a6d5-dcaeaa662dc7
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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