YARA · Malpedia signator rules
MALPEDIA_Win_Webc2_Cson_Auto
autogenerated rule brought to you by yara-signator
MalwareWebc2 CsonMalpedia 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: Webc2 Cson.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-webc2-cson-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Cson_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "a3b064c1-e377-5476-b431-57d7ecf004e6"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_cson"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_cson_auto.yar#L1-L124"
= "N/A"
= "861ac16bbeea9202559a0e9282ce7e10d6c2469e48863b1302f01e593710e202"
= 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 = { e9???????? 8d45f4 53 50 8d8540ffffff 50 }
$sequence_1 = { 33c0 8dbd01fcffff f3ab 66ab 6a00 }
$sequence_2 = { 8dbded6bfeff 889dec6bfeff f3ab 66ab aa 8d45ec }
$sequence_3 = { 57 ff15???????? 8b35???????? 8be8 }
$sequence_4 = { 8d85acfeffff 6800010000 50 ff15???????? 8d85acfeffff }
$sequence_5 = { 68???????? 50 ff15???????? 8bf8 3bfb 7511 }
$sequence_6 = { 3bf3 59 7428 56 ff75fc 6a01 ff75f0 }
$sequence_7 = { 33c0 59 8dbd41ffffff 889d40ffffff 68???????? f3ab 66ab }
$sequence_8 = { 50 ff15???????? e9???????? 8d45c0 68???????? 50 ff15???????? }
$sequence_9 = { 8b35???????? 8d45f4 53 50 8d45e0 c745f410000000 50 }
condition:
7 of them and filesize < 98304
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { e9???????? 8d45f4 53 50 8d8540ffffff 50 } | |
| $sequence_1 | hex | { 33c0 8dbd01fcffff f3ab 66ab 6a00 } | |
| $sequence_2 | hex | { 8dbded6bfeff 889dec6bfeff f3ab 66ab aa 8d45ec } | |
| $sequence_3 | hex | { 57 ff15???????? 8b35???????? 8be8 } | |
| $sequence_4 | hex | { 8d85acfeffff 6800010000 50 ff15???????? 8d85acfeffff } | |
| $sequence_5 | hex | { 68???????? 50 ff15???????? 8bf8 3bfb 7511 } | |
| $sequence_6 | hex | { 3bf3 59 7428 56 ff75fc 6a01 ff75f0 } | |
| $sequence_7 | hex | { 33c0 59 8dbd41ffffff 889d40ffffff 68???????? f3ab 66ab } | |
| $sequence_8 | hex | { 50 ff15???????? e9???????? 8d45c0 68???????? 50 ff15???????? } | |
| $sequence_9 | hex | { 8b35???????? 8d45f4 53 50 8d45e0 c745f410000000 50 } |
Condition
7 of them and filesize < 98304In plain words (Heuristic)
- The file must be smaller than 98304 (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: a3b064c1-e377-5476-b431-57d7ecf004e6
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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