YARA · Malpedia signator rules
MALPEDIA_Win_Webc2_Kt3_Auto
autogenerated rule brought to you by yara-signator
MalwareWebc2 Kt3Malpedia 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 Kt3.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-webc2-kt3-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Kt3_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "bf03e91b-3d35-5384-9df8-afffbe1a85ef"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_kt3"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_kt3_auto.yar#L1-L118"
= "N/A"
= "3850aca370467a6f4313421f7ed5d71224a0fec60d04baaad68e3c83784bdddc"
= 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 = { 33c0 f2ae f7d1 83c1ff 894df0 }
$sequence_1 = { 6a18 e8???????? 83c404 8985e8fbffff b906000000 }
$sequence_2 = { 8b45dc c7400cffffffff 6a00 8b4ddc }
$sequence_3 = { 7425 0fb601 0fb6fa 3bc7 7714 8b55fc 8a92c0c84000 }
$sequence_4 = { 41 41 8079ff00 0f8547ffffff 8bc6 808821d3400008 }
$sequence_5 = { 8945d0 8b4d0c 894dd4 8b550c }
$sequence_6 = { ff15???????? e9???????? 8b8de8fbffff 51 e8???????? 83c404 }
$sequence_7 = { 8d55f4 52 8d45f0 50 8b4de8 51 ff15???????? }
$sequence_8 = { 0f8502000000 ebe9 c745dc00000000 c7459844000000 }
$sequence_9 = { 7229 f3a5 ff2495c8744000 8bc7 ba03000000 83e904 }
condition:
7 of them and filesize < 114688
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 33c0 f2ae f7d1 83c1ff 894df0 } | |
| $sequence_1 | hex | { 6a18 e8???????? 83c404 8985e8fbffff b906000000 } | |
| $sequence_2 | hex | { 8b45dc c7400cffffffff 6a00 8b4ddc } | |
| $sequence_3 | hex | { 7425 0fb601 0fb6fa 3bc7 7714 8b55fc 8a92c0c84000 } | |
| $sequence_4 | hex | { 41 41 8079ff00 0f8547ffffff 8bc6 808821d3400008 } | |
| $sequence_5 | hex | { 8945d0 8b4d0c 894dd4 8b550c } | |
| $sequence_6 | hex | { ff15???????? e9???????? 8b8de8fbffff 51 e8???????? 83c404 } | |
| $sequence_7 | hex | { 8d55f4 52 8d45f0 50 8b4de8 51 ff15???????? } | |
| $sequence_8 | hex | { 0f8502000000 ebe9 c745dc00000000 c7459844000000 } | |
| $sequence_9 | hex | { 7229 f3a5 ff2495c8744000 8bc7 ba03000000 83e904 } |
Condition
7 of them and filesize < 114688In plain words (Heuristic)
- The file must be smaller than 114688 (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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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: bf03e91b-3d35-5384-9df8-afffbe1a85ef
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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