YARA · Malpedia signator rules
MALPEDIA_Win_Cruloader_Auto
autogenerated rule brought to you by yara-signator
MalwareCruloaderMalpedia 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: Cruloader.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-cruloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Cruloader_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "beb777f6-698b-5f87-9417-eaa53db36a44"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.cruloader"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.cruloader_auto.yar#L1-L124"
= "N/A"
= "1d25f7864b0ec52a1506576efb05e68dedde2efdecc898c3ce096861873bf5c1"
= 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 = { a3???????? 33c9 e8???????? ba4d822ee6 33c9 e8???????? }
$sequence_1 = { 83c408 85c0 0f8540040000 ba4d822ee6 33c9 e8???????? }
$sequence_2 = { 83e13f c1f806 6bc938 8b0485d85e4100 0fb6440828 }
$sequence_3 = { 8d1c85505e4100 8b03 90 8b15???????? 83cfff 8bca 33d0 }
$sequence_4 = { 56 57 8b7d08 eb6f 8b07 8d1c85605c4100 }
$sequence_5 = { 89049d90624100 43 81fb00010000 0f8c5cffffff }
$sequence_6 = { 41 0fbfc1 3bc6 72dd 8b7a04 03d7 8b7a04 }
$sequence_7 = { 53 56 57 33c9 0f1145ec e8???????? }
$sequence_8 = { ddd8 db2d???????? b802000000 833d????????00 0f85b00d0000 8d0db02f4100 ba1b000000 }
$sequence_9 = { 3bf8 7210 8b8508fdffff 42 83c128 3bd0 }
condition:
7 of them and filesize < 196608
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { a3???????? 33c9 e8???????? ba4d822ee6 33c9 e8???????? } | |
| $sequence_1 | hex | { 83c408 85c0 0f8540040000 ba4d822ee6 33c9 e8???????? } | |
| $sequence_2 | hex | { 83e13f c1f806 6bc938 8b0485d85e4100 0fb6440828 } | |
| $sequence_3 | hex | { 8d1c85505e4100 8b03 90 8b15???????? 83cfff 8bca 33d0 } | |
| $sequence_4 | hex | { 56 57 8b7d08 eb6f 8b07 8d1c85605c4100 } | |
| $sequence_5 | hex | { 89049d90624100 43 81fb00010000 0f8c5cffffff } | |
| $sequence_6 | hex | { 41 0fbfc1 3bc6 72dd 8b7a04 03d7 8b7a04 } | |
| $sequence_7 | hex | { 53 56 57 33c9 0f1145ec e8???????? } | |
| $sequence_8 | hex | { ddd8 db2d???????? b802000000 833d????????00 0f85b00d0000 8d0db02f4100 ba1b000000 } | |
| $sequence_9 | hex | { 3bf8 7210 8b8508fdffff 42 83c128 3bd0 } |
Condition
7 of them and filesize < 196608In plain words (Heuristic)
- The file must be smaller than 196608 (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: beb777f6-698b-5f87-9417-eaa53db36a44
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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