YARA · Malpedia signator rules
MALPEDIA_Win_Downex_Auto
autogenerated rule brought to you by yara-signator
- 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: Downex.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-downex-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Downex_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "75a4c5a4-828c-538a-84fc-d73a146dfd41"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.downex"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.downex_auto.yar#L1-L134"
= "N/A"
= "c2d8d6f74a78cee1a1b4955dcfce1bba7077f6919a6bd08030ecc79c5f31e95e"
= 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 = { ff4014 83c2f0 66d3ef 8b88bc160000 6689b8b8160000 03ca e9???????? }
$sequence_1 = { e8???????? 83c410 85c0 746a 57 e8???????? 52 }
$sequence_2 = { 8d8d20feffff e8???????? 8d8d08feffff e8???????? 8b8d10ffffff 83f910 7251 }
$sequence_3 = { 8901 83f804 7e7b e8???????? 8b30 eb72 39b1a8000000 }
$sequence_4 = { ffb5f8fdffff e8???????? 8d85ecfdffff 50 e8???????? 83c410 b8e2ffffff }
$sequence_5 = { d3e0 837d0801 8945a0 c7458cffffffff 8d48ff 894d88 0f85a5000000 }
$sequence_6 = { ffd7 85c0 75a2 ba???????? b9???????? e8???????? 837c243c10 }
$sequence_7 = { 898ddcfeffff 8bc7 81f900100000 721a 83c123 898ddcfeffff 8b78fc }
$sequence_8 = { ff75f8 51 8bcf e8???????? 8b4df4 83f910 7228 }
$sequence_9 = { 8d45f0 50 e8???????? 83c410 eb1f 81e7ffffdfff f7c200002000 }
condition:
7 of them and filesize < 1067008
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { ff4014 83c2f0 66d3ef 8b88bc160000 6689b8b8160000 03ca e9???????? } | |
| $sequence_1 | hex | { e8???????? 83c410 85c0 746a 57 e8???????? 52 } | |
| $sequence_2 | hex | { 8d8d20feffff e8???????? 8d8d08feffff e8???????? 8b8d10ffffff 83f910 7251 } | |
| $sequence_3 | hex | { 8901 83f804 7e7b e8???????? 8b30 eb72 39b1a8000000 } | |
| $sequence_4 | hex | { ffb5f8fdffff e8???????? 8d85ecfdffff 50 e8???????? 83c410 b8e2ffffff } | |
| $sequence_5 | hex | { d3e0 837d0801 8945a0 c7458cffffffff 8d48ff 894d88 0f85a5000000 } | |
| $sequence_6 | hex | { ffd7 85c0 75a2 ba???????? b9???????? e8???????? 837c243c10 } | |
| $sequence_7 | hex | { 898ddcfeffff 8bc7 81f900100000 721a 83c123 898ddcfeffff 8b78fc } | |
| $sequence_8 | hex | { ff75f8 51 8bcf e8???????? 8b4df4 83f910 7228 } | |
| $sequence_9 | hex | { 8d45f0 50 e8???????? 83c410 eb1f 81e7ffffdfff f7c200002000 } |
Condition
7 of them and filesize < 1067008In plain words (Heuristic)
- The file must be smaller than 1067008 (a cheap guard that skips large files).
- At least 7 patterns in the rule must match.
Test this rule in your browser
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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: 75a4c5a4-828c-538a-84fc-d73a146dfd41
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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