YARA · Malpedia signator rules
MALPEDIA_Win_Underminer_Ek_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 / 73
What this rule detects
autogenerated rule brought to you by yara-signator
Associated malware family: Underminer Ek.
It defines 16 patterns (0 text, 16 hex, 0 regex).
YARA-X says: warning[text_as_hex]: hex pattern could be written as text literal
Summary generated from the rule's metadata and condition.
Rule source
rule MALPEDIA_Win_Underminer_Ek_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "478c25cf-e188-5b79-8aeb-6935a8b536f7"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.underminer_ek"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.underminer_ek_auto.yar#L1-L178"
= "N/A"
= "4786465e315c0c23f824b89be267cb511060061f2cde5a1665c6404f963bc60b"
= 75
= 73
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "TLP:WHITE"
strings:
$sequence_0 = { 8a450f 884708 0fb6450b 89470c e9???????? 3cc8 }
$sequence_1 = { 3d40420f00 734f 83ec18 8bcc 68???????? e8???????? 8d4dc8 }
$sequence_2 = { 8904bd582c4300 85c0 7514 6a0c 5e 8975e4 c745fcfeffffff }
$sequence_3 = { c3 ff742408 8b442408 ff10 c3 }
$sequence_4 = { 897df8 6681384d5a 0f85bd000000 8b703c 03f0 }
$sequence_5 = { 6a00 50 ff5604 8d460c 6a00 50 ff16 }
$sequence_6 = { 0fb6560b c1e008 0bc2 8be8 8d470c 3bc8 7278 }
$sequence_7 = { 8b75c8 8d4de0 ff75d8 8b55f0 83ff10 0f43c6 }
$sequence_8 = { 47 884607 897df4 c745f04a50fa7e eb18 3ca0 7214 }
$sequence_9 = { 8d45e0 50 8d8d08ffffff e8???????? 8b55f4 83fa10 }
$sequence_10 = { 3bd8 3be2 3bf3 3bf8 }
$sequence_11 = { 7473 3bc3 c7450c32000000 7538 8b35???????? bf1453fa7e }
$sequence_12 = { c7431000000000 8d5101 c743140f000000 c60300 0f1f8000000000 8a01 }
$sequence_13 = { 8b450c 0fb684c848914200 c1e804 c9 c20800 8bff }
$sequence_14 = { 3836 42 3653 3658 }
$sequence_15 = { 03c8 3b4de8 7751 395de0 7440 83c00d 50 }
condition:
7 of them and filesize < 466944
}
Strings (16 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8a450f 884708 0fb6450b 89470c e9???????? 3cc8 } | |
| $sequence_1 | hex | { 3d40420f00 734f 83ec18 8bcc 68???????? e8???????? 8d4dc8 } | |
| $sequence_2 | hex | { 8904bd582c4300 85c0 7514 6a0c 5e 8975e4 c745fcfeffffff } | |
| $sequence_3 | hex | { c3 ff742408 8b442408 ff10 c3 } | |
| $sequence_4 | hex | { 897df8 6681384d5a 0f85bd000000 8b703c 03f0 } | |
| $sequence_5 | hex | { 6a00 50 ff5604 8d460c 6a00 50 ff16 } | |
| $sequence_6 | hex | { 0fb6560b c1e008 0bc2 8be8 8d470c 3bc8 7278 } | |
| $sequence_7 | hex | { 8b75c8 8d4de0 ff75d8 8b55f0 83ff10 0f43c6 } | |
| $sequence_8 | hex | { 47 884607 897df4 c745f04a50fa7e eb18 3ca0 7214 } | |
| $sequence_9 | hex | { 8d45e0 50 8d8d08ffffff e8???????? 8b55f4 83fa10 } | |
| $sequence_10 | hex | { 3bd8 3be2 3bf3 3bf8 } | |
| $sequence_11 | hex | { 7473 3bc3 c7450c32000000 7538 8b35???????? bf1453fa7e } | |
| $sequence_12 | hex | { c7431000000000 8d5101 c743140f000000 c60300 0f1f8000000000 8a01 } | |
| $sequence_13 | hex | { 8b450c 0fb684c848914200 c1e804 c9 c20800 8bff } | |
| $sequence_14 | hex | { 3836 42 3653 3658 } | |
| $sequence_15 | hex | { 03c8 3b4de8 7751 395de0 7440 83c00d 50 } |
Condition
7 of them and filesize < 466944In plain words (Heuristic)
- The file must be smaller than 466944 (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.
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: 478c25cf-e188-5b79-8aeb-6935a8b536f7
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
- 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
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04