YARA · Malpedia signator rules
MALPEDIA_Win_Mystic_Stealer_Auto
autogenerated rule brought to you by yara-signator
MalwareMystic StealerMalpedia 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: Mystic Stealer.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-mystic-stealer-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Mystic_Stealer_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "669e0d29-c98f-59de-8cf5-902f29ae3a52"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.mystic_stealer"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.mystic_stealer_auto.yar#L1-L114"
= "N/A"
= "21ec795eb8ab4014e3a067a382badfa4fd3bac788790ebafb7beb557561dc9fc"
= 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 = { c7460445000000 8b4e04 8d6e1c 83f945 }
$sequence_1 = { 234754 83bfb416000000 894748 7452 8b4738 8b4f58 }
$sequence_2 = { 668bc7 66d3e0 660bc5 0fb7c8 }
$sequence_3 = { 8b4c241c 83c40c 8b4500 034e14 894e14 }
$sequence_4 = { 8d040a 0fb78fb8160000 660bf1 0fb7ce }
$sequence_5 = { 8386bc160000f3 b110 2ac8 66d3ef 0fb7c7 }
$sequence_6 = { 80ea03 c6040101 8b8ea0160000 8b8698160000 41 898ea0160000 c6040100 }
$sequence_7 = { 59 59 ffd0 8be8 }
$sequence_8 = { 898550140000 898c855c0b0000 33c0 40 6689048b c684295814000000 ff8da8160000 }
$sequence_9 = { 33db 668987b8160000 85ed 0f8ea0000000 }
condition:
7 of them and filesize < 512000
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { c7460445000000 8b4e04 8d6e1c 83f945 } | |
| $sequence_1 | hex | { 234754 83bfb416000000 894748 7452 8b4738 8b4f58 } | |
| $sequence_2 | hex | { 668bc7 66d3e0 660bc5 0fb7c8 } | |
| $sequence_3 | hex | { 8b4c241c 83c40c 8b4500 034e14 894e14 } | |
| $sequence_4 | hex | { 8d040a 0fb78fb8160000 660bf1 0fb7ce } | |
| $sequence_5 | hex | { 8386bc160000f3 b110 2ac8 66d3ef 0fb7c7 } | |
| $sequence_6 | hex | { 80ea03 c6040101 8b8ea0160000 8b8698160000 41 898ea0160000 c6040100 } | |
| $sequence_7 | hex | { 59 59 ffd0 8be8 } | |
| $sequence_8 | hex | { 898550140000 898c855c0b0000 33c0 40 6689048b c684295814000000 ff8da8160000 } | |
| $sequence_9 | hex | { 33db 668987b8160000 85ed 0f8ea0000000 } |
Condition
7 of them and filesize < 512000In plain words (Heuristic)
- The file must be smaller than 512000 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.
Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.
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: 669e0d29-c98f-59de-8cf5-902f29ae3a52
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
Related rules
- MalwareEmbee Research· Matthew @ Embee_reserch· 2023-09-21
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04