YARA · Malpedia signator rules
MALPEDIA_Win_Slowstepper_Auto
autogenerated rule brought to you by yara-signator
MalwareSlowstepperMalpedia 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: Slowstepper.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-slowstepper-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Slowstepper_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "39bdca13-0127-53b7-8485-f660ba74cd3d"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.slowstepper"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.slowstepper_auto.yar#L1-L134"
= "N/A"
= "961d15a6340eca8906edf01a770461e1f1364731e9beeea6bea60a858af70d2d"
= 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 = { 8bca c1f908 884df6 8bfa c1ff1f 8bca 884df7 }
$sequence_1 = { e8???????? c3 837da408 8b4590 7303 8d4590 53 }
$sequence_2 = { ffd0 8345e404 ebe6 c745e048d34c00 817de04cd34c00 7311 8b45e0 }
$sequence_3 = { e8???????? c20400 6a48 b8???????? e8???????? 8b4508 33db }
$sequence_4 = { 8d420c 8b8a30ecffff 33c8 e8???????? 8b4af8 33c8 e8???????? }
$sequence_5 = { 50 e8???????? 8d85e4feffff 83c414 830bff 8d7001 8a08 }
$sequence_6 = { 53 56 8b750c 57 8bf9 8b5f20 e8???????? }
$sequence_7 = { c684248895010004 8b35???????? 50 e8???????? 50 ff15???????? 53 }
$sequence_8 = { 50 a3???????? ff15???????? a3???????? 8d851cf1ffff 50 ff35???????? }
$sequence_9 = { e9???????? 8d4d98 e9???????? 8db534ffffff e9???????? 8d4dd0 e9???????? }
condition:
7 of them and filesize < 909312
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8bca c1f908 884df6 8bfa c1ff1f 8bca 884df7 } | |
| $sequence_1 | hex | { e8???????? c3 837da408 8b4590 7303 8d4590 53 } | |
| $sequence_2 | hex | { ffd0 8345e404 ebe6 c745e048d34c00 817de04cd34c00 7311 8b45e0 } | |
| $sequence_3 | hex | { e8???????? c20400 6a48 b8???????? e8???????? 8b4508 33db } | |
| $sequence_4 | hex | { 8d420c 8b8a30ecffff 33c8 e8???????? 8b4af8 33c8 e8???????? } | |
| $sequence_5 | hex | { 50 e8???????? 8d85e4feffff 83c414 830bff 8d7001 8a08 } | |
| $sequence_6 | hex | { 53 56 8b750c 57 8bf9 8b5f20 e8???????? } | |
| $sequence_7 | hex | { c684248895010004 8b35???????? 50 e8???????? 50 ff15???????? 53 } | |
| $sequence_8 | hex | { 50 a3???????? ff15???????? a3???????? 8d851cf1ffff 50 ff35???????? } | |
| $sequence_9 | hex | { e9???????? 8d4d98 e9???????? 8db534ffffff e9???????? 8d4dd0 e9???????? } |
Condition
7 of them and filesize < 909312In plain words (Heuristic)
- The file must be smaller than 909312 (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: 39bdca13-0127-53b7-8485-f660ba74cd3d
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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