YARA · Malpedia signator rules
MALPEDIA_Win_Webc2_Greencat_Auto
autogenerated rule brought to you by yara-signator
MalwareWebc2 GreencatMalpedia 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 Greencat.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-webc2-greencat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Greencat_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "8ee36097-f75d-5f23-b7c0-2b1501f10d10"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_greencat"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_greencat_auto.yar#L1-L124"
= "N/A"
= "6e607d6af3a17c55b181e1e30c6195baee68c76f9aea2ce264863323620312fb"
= 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 = { 59 57 57 56 68???????? 57 57 }
$sequence_1 = { 83ff05 72db 83ff05 0f849f030000 6800000100 e8???????? }
$sequence_2 = { 3bc3 59 7445 6a2f 55 885801 }
$sequence_3 = { c20400 56 8bf1 57 8b3d???????? 8b460c 85c0 }
$sequence_4 = { e8???????? be24020000 8d859cfbffff 56 53 }
$sequence_5 = { c645d1f0 c645d2d2 c645d3e6 c645d4e8 c645d540 c645d64a c645d7e6 }
$sequence_6 = { 59 0f84f8000000 802000 8d85f9fdffff 50 }
$sequence_7 = { ff750c e8???????? e9???????? 8b4508 53 }
$sequence_8 = { c6065c 50 ff15???????? 8bf8 8bc7 }
$sequence_9 = { 53 53 53 53 8d85e0fdffff 6805010000 50 }
condition:
7 of them and filesize < 57344
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 59 57 57 56 68???????? 57 57 } | |
| $sequence_1 | hex | { 83ff05 72db 83ff05 0f849f030000 6800000100 e8???????? } | |
| $sequence_2 | hex | { 3bc3 59 7445 6a2f 55 885801 } | |
| $sequence_3 | hex | { c20400 56 8bf1 57 8b3d???????? 8b460c 85c0 } | |
| $sequence_4 | hex | { e8???????? be24020000 8d859cfbffff 56 53 } | |
| $sequence_5 | hex | { c645d1f0 c645d2d2 c645d3e6 c645d4e8 c645d540 c645d64a c645d7e6 } | |
| $sequence_6 | hex | { 59 0f84f8000000 802000 8d85f9fdffff 50 } | |
| $sequence_7 | hex | { ff750c e8???????? e9???????? 8b4508 53 } | |
| $sequence_8 | hex | { c6065c 50 ff15???????? 8bf8 8bc7 } | |
| $sequence_9 | hex | { 53 53 53 53 8d85e0fdffff 6805010000 50 } |
Condition
7 of them and filesize < 57344In plain words (Heuristic)
- The file must be smaller than 57344 (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: 8ee36097-f75d-5f23-b7c0-2b1501f10d10
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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