YARA · Malpedia signator rules
MALPEDIA_Win_5T_Downloader_Auto
autogenerated rule brought to you by yara-signator
Malware5T DownloaderMalpedia 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: 5T Downloader.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-5t-downloader-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_5T_Downloader_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "0ab45afc-a375-507f-9f9b-8207d0d5861a"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.5t_downloader"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.5t_downloader_auto.yar#L1-L116"
= "N/A"
= "d63109b9465c501c9171596ca61e05b19ae0a788ab6deab75bb698128d50000e"
= 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 = { 8b4508 85c0 7416 83781400 }
$sequence_1 = { 85c9 7409 83781800 7403 5d }
$sequence_2 = { 8b4508 85c0 7416 83781400 7510 }
$sequence_3 = { 55 8bec 8b4508 85c0 7416 83781400 7510 }
$sequence_4 = { 85c9 7409 83781800 7403 5d ffe1 83c8ff }
$sequence_5 = { 83781800 7403 5d ffe1 83c8ff }
$sequence_6 = { 8bec 8b4508 85c0 7416 83781400 7510 }
$sequence_7 = { 85c9 7409 83781800 7403 }
$sequence_8 = { 8bec 8b4508 85c0 7416 83781400 }
$sequence_9 = { 7409 83781800 7403 5d }
condition:
7 of them and filesize < 539648
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8b4508 85c0 7416 83781400 } | |
| $sequence_1 | hex | { 85c9 7409 83781800 7403 5d } | |
| $sequence_2 | hex | { 8b4508 85c0 7416 83781400 7510 } | |
| $sequence_3 | hex | { 55 8bec 8b4508 85c0 7416 83781400 7510 } | |
| $sequence_4 | hex | { 85c9 7409 83781800 7403 5d ffe1 83c8ff } | |
| $sequence_5 | hex | { 83781800 7403 5d ffe1 83c8ff } | |
| $sequence_6 | hex | { 8bec 8b4508 85c0 7416 83781400 7510 } | |
| $sequence_7 | hex | { 85c9 7409 83781800 7403 } | |
| $sequence_8 | hex | { 8bec 8b4508 85c0 7416 83781400 } | |
| $sequence_9 | hex | { 7409 83781800 7403 5d } |
Condition
7 of them and filesize < 539648In plain words (Heuristic)
- The file must be smaller than 539648 (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: 0ab45afc-a375-507f-9f9b-8207d0d5861a
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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