YARA · Malpedia signator rules
MALPEDIA_Win_Winsloader_Auto
autogenerated rule brought to you by yara-signator
MalwareWinsloaderMalpedia 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: Winsloader.
It defines 16 patterns (0 text, 16 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-winsloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Winsloader_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "ba76a90b-c734-50e9-972e-d56f090bf0e5"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.winsloader"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.winsloader_auto.yar#L1-L167"
= "N/A"
= "3e23de21e591d5e814dc9229e916c96b455b15e493e83f4f6d54002bf8da25e4"
= 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 = { 6800100000 56 8d8375050000 6a00 a3???????? ff15???????? 8bf8 }
$sequence_1 = { 68???????? 52 e8???????? 68???????? 8d743e06 e8???????? }
$sequence_2 = { 888c3500fcffff 8d4f01 51 8d943501fcffff }
$sequence_3 = { 8d9b00000000 891cc8 895cc804 41 }
$sequence_4 = { 83c410 8d7001 8d9b00000000 8a08 40 84c9 75f9 }
$sequence_5 = { 83c40c 66c7843500fcfffff90b 8d4801 8d4900 8a10 40 }
$sequence_6 = { 83c40c 6800040000 8d8dfcf7ffff 51 }
$sequence_7 = { 57 8bd8 ff15???????? 53 e8???????? 8bf0 83c404 }
$sequence_8 = { 742e 6a00 57 ff15???????? 6a00 }
$sequence_9 = { 42 3bd3 72f3 8b7c2424 e9???????? 8b442414 }
$sequence_10 = { 83c404 85f6 0f847f000000 57 6a00 }
$sequence_11 = { 741c 8b74241c 8bcf 2bf7 }
$sequence_12 = { 83e03f 6bc830 8b0495c0c00110 f644082801 }
$sequence_13 = { e9???????? c745e0647c0110 e9???????? c745dc02000000 }
$sequence_14 = { e8???????? 83c448 68???????? 6a40 68???????? e8???????? }
$sequence_15 = { 56 e8???????? ff75c8 e8???????? 83c438 33f6 }
condition:
7 of them and filesize < 270336
}
Strings (16 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 6800100000 56 8d8375050000 6a00 a3???????? ff15???????? 8bf8 } | |
| $sequence_1 | hex | { 68???????? 52 e8???????? 68???????? 8d743e06 e8???????? } | |
| $sequence_2 | hex | { 888c3500fcffff 8d4f01 51 8d943501fcffff } | |
| $sequence_3 | hex | { 8d9b00000000 891cc8 895cc804 41 } | |
| $sequence_4 | hex | { 83c410 8d7001 8d9b00000000 8a08 40 84c9 75f9 } | |
| $sequence_5 | hex | { 83c40c 66c7843500fcfffff90b 8d4801 8d4900 8a10 40 } | |
| $sequence_6 | hex | { 83c40c 6800040000 8d8dfcf7ffff 51 } | |
| $sequence_7 | hex | { 57 8bd8 ff15???????? 53 e8???????? 8bf0 83c404 } | |
| $sequence_8 | hex | { 742e 6a00 57 ff15???????? 6a00 } | |
| $sequence_9 | hex | { 42 3bd3 72f3 8b7c2424 e9???????? 8b442414 } | |
| $sequence_10 | hex | { 83c404 85f6 0f847f000000 57 6a00 } | |
| $sequence_11 | hex | { 741c 8b74241c 8bcf 2bf7 } | |
| $sequence_12 | hex | { 83e03f 6bc830 8b0495c0c00110 f644082801 } | |
| $sequence_13 | hex | { e9???????? c745e0647c0110 e9???????? c745dc02000000 } | |
| $sequence_14 | hex | { e8???????? 83c448 68???????? 6a40 68???????? e8???????? } | |
| $sequence_15 | hex | { 56 e8???????? ff75c8 e8???????? 83c438 33f6 } |
Condition
7 of them and filesize < 270336In plain words (Heuristic)
- The file must be smaller than 270336 (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: ba76a90b-c734-50e9-972e-d56f090bf0e5
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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