YARA · Malpedia signator rules
MALPEDIA_Win_Webmonitor_Auto
autogenerated rule brought to you by yara-signator
MalwareWebmonitorMalpedia 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: Webmonitor.
It defines 16 patterns (0 text, 16 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-webmonitor-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webmonitor_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "3732efb2-6b36-5e6c-94ac-9c96812b2d01"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.webmonitor"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webmonitor_auto.yar#L1-L166"
= "N/A"
= "b3dfe96ce488790f0298ba915da8d471590e953d80de53d7b6c6de96cdf61598"
= 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 = { 000d???????? 04e4 fd 0468 ff05???????? 000d???????? 04b8 }
$sequence_1 = { 03c1 99 f7fb 47 }
$sequence_2 = { ffe1 ba???????? b9???????? ffe1 ba???????? }
$sequence_3 = { fe04e4 fd 04e0 fd ff01 04e0 fd }
$sequence_4 = { 04c8 fe04ec fd 04e8 fd ff01 }
$sequence_5 = { 0f5ac0 50 51 51 f20f110424 e8???????? d91b }
$sequence_6 = { 0f434520 50 ff75c8 ff15???????? }
$sequence_7 = { 0f437520 ff15???????? 8d044501000000 50 }
$sequence_8 = { 0fb6c0 d3e0 8b4de0 03c8 }
$sequence_9 = { 2bf0 8bc1 99 83e203 03c2 c1f802 2bf8 }
$sequence_10 = { 3001 a3???????? 30ff 9e 6c 68ff080800 }
$sequence_11 = { 9e 6c 68ff080800 8a3401 a3???????? 0800 8a30 }
$sequence_12 = { 38644400 44 8a4100 047e }
$sequence_13 = { 00e8 17 42 0048a5 }
$sequence_14 = { 49 81c900ffffff 41 898f04040000 }
$sequence_15 = { 0f4305???????? 33c9 6800900100 668908 }
condition:
7 of them and filesize < 1984512
}
Strings (16 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 000d???????? 04e4 fd 0468 ff05???????? 000d???????? 04b8 } | |
| $sequence_1 | hex | { 03c1 99 f7fb 47 } | |
| $sequence_2 | hex | { ffe1 ba???????? b9???????? ffe1 ba???????? } | |
| $sequence_3 | hex | { fe04e4 fd 04e0 fd ff01 04e0 fd } | |
| $sequence_4 | hex | { 04c8 fe04ec fd 04e8 fd ff01 } | |
| $sequence_5 | hex | { 0f5ac0 50 51 51 f20f110424 e8???????? d91b } | |
| $sequence_6 | hex | { 0f434520 50 ff75c8 ff15???????? } | |
| $sequence_7 | hex | { 0f437520 ff15???????? 8d044501000000 50 } | |
| $sequence_8 | hex | { 0fb6c0 d3e0 8b4de0 03c8 } | |
| $sequence_9 | hex | { 2bf0 8bc1 99 83e203 03c2 c1f802 2bf8 } | |
| $sequence_10 | hex | { 3001 a3???????? 30ff 9e 6c 68ff080800 } | |
| $sequence_11 | hex | { 9e 6c 68ff080800 8a3401 a3???????? 0800 8a30 } | |
| $sequence_12 | hex | { 38644400 44 8a4100 047e } | |
| $sequence_13 | hex | { 00e8 17 42 0048a5 } | |
| $sequence_14 | hex | { 49 81c900ffffff 41 898f04040000 } | |
| $sequence_15 | hex | { 0f4305???????? 33c9 6800900100 668908 } |
Condition
7 of them and filesize < 1984512In plain words (Heuristic)
- The file must be smaller than 1984512 (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: 3732efb2-6b36-5e6c-94ac-9c96812b2d01
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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