YARA · Malpedia signator rules
MALPEDIA_Win_Metastealer_Auto
autogenerated rule brought to you by yara-signator
MalwareMetastealerMalpedia 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: Metastealer.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-metastealer-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Metastealer_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "3baf84fe-10cc-57cd-aa16-e96a6c220c3c"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.metastealer"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.metastealer_auto.yar#L1-L134"
= "N/A"
= "9af13bebbf5e90fc81418a1671f5578121365d1656c7cb07e006574138ecd4c4"
= 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 = { ff74c120 ff7514 e8???????? 83c410 eb32 50 53 }
$sequence_1 = { ff710c 68???????? 50 e8???????? 8b16 83c424 8b4208 }
$sequence_2 = { f7d9 51 50 e8???????? 83c408 c640ff2d 48 }
$sequence_3 = { e8???????? 8bc8 0fb6d1 c1f908 898d88f6ffff 85d2 0f84b0000000 }
$sequence_4 = { e8???????? 837e1410 8bc6 7202 8b06 6a00 6a00 }
$sequence_5 = { f7d8 3bd0 737c 8d42ff 33d2 03c6 f7f6 }
$sequence_6 = { ffb52ceeffff 50 8d8560ffffff 50 ff9510eeffff 83c41c c645fc0a }
$sequence_7 = { f7470c00040000 740b 8b9f80020000 895d08 eb0e 57 e8???????? }
$sequence_8 = { ffb568ffffff 6a00 8b08 50 ff5114 8b4f24 8d573c }
$sequence_9 = { ff7010 52 e8???????? 8d4358 8d4f58 3bc8 7413 }
condition:
7 of them and filesize < 26230784
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { ff74c120 ff7514 e8???????? 83c410 eb32 50 53 } | |
| $sequence_1 | hex | { ff710c 68???????? 50 e8???????? 8b16 83c424 8b4208 } | |
| $sequence_2 | hex | { f7d9 51 50 e8???????? 83c408 c640ff2d 48 } | |
| $sequence_3 | hex | { e8???????? 8bc8 0fb6d1 c1f908 898d88f6ffff 85d2 0f84b0000000 } | |
| $sequence_4 | hex | { e8???????? 837e1410 8bc6 7202 8b06 6a00 6a00 } | |
| $sequence_5 | hex | { f7d8 3bd0 737c 8d42ff 33d2 03c6 f7f6 } | |
| $sequence_6 | hex | { ffb52ceeffff 50 8d8560ffffff 50 ff9510eeffff 83c41c c645fc0a } | |
| $sequence_7 | hex | { f7470c00040000 740b 8b9f80020000 895d08 eb0e 57 e8???????? } | |
| $sequence_8 | hex | { ffb568ffffff 6a00 8b08 50 ff5114 8b4f24 8d573c } | |
| $sequence_9 | hex | { ff7010 52 e8???????? 8d4358 8d4f58 3bc8 7413 } |
Condition
7 of them and filesize < 26230784In plain words (Heuristic)
- The file must be smaller than 26230784 (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: 3baf84fe-10cc-57cd-aa16-e96a6c220c3c
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
- MalwareditekSHen detection· ditekSHen· 2020-11-06
- RUSSIANPANDA_MetastealerMetadata onlyMalwareRussianPanda· RussianPanda· 2023-11-16
- RUSSIANPANDA_Metastealer_Core_PayloadMetadata onlyMalwareRussianPanda· RussianPanda· 2023-12-29
- RUSSIANPANDA_Metastealer_NET_Reactor_PackerMetadata onlySuspicious / huntingRussianPanda· RussianPanda· 2023-12-29
- 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