YARA · Malpedia signator rules
MALPEDIA_Win_Webc2_Qbp_Auto
autogenerated rule brought to you by yara-signator
MalwareWebc2 QbpMalpedia 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 Qbp.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-webc2-qbp-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Webc2_Qbp_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "06ba101e-9797-5160-8466-c700bf70efc4"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.webc2_qbp"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.webc2_qbp_auto.yar#L1-L124"
= "N/A"
= "cb136ce0e6dd81740d74a10fce0e11de9647a6f524e85eac23a0cac8bc2b19b2"
= 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???????? 8b85f0feffff 8d4c0001 898dd8fcffff }
$sequence_1 = { 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec 668b45f4 6689844a4e720000 0fbf4d08 }
$sequence_2 = { 83c404 33c0 e9???????? 8b85d8fcffff }
$sequence_3 = { 8b4df0 83e901 894df0 837df000 7e21 8b55f8 83e201 }
$sequence_4 = { 6a03 68???????? 8b4508 50 ff15???????? 83c40c 85c0 }
$sequence_5 = { 8b75ec 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec }
$sequence_6 = { ff15???????? 8945e4 837de4ff 7511 8b4de8 51 ff15???????? }
$sequence_7 = { 66898c504a300000 eb1e 0fbf55fc 8b45e8 0fbf8c504c520000 }
$sequence_8 = { 81c173020000 0fbf55fc 8b45f4 66898c50907e0000 0fbf4dfc 8b55f4 668b45fc }
$sequence_9 = { 0fbf5508 8b45ec 668b8c501c7c0000 66894d08 0fbf5508 8b45ec 668b8c504e720000 }
condition:
7 of them and filesize < 630784
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { e9???????? 8b85f0feffff 8d4c0001 898dd8fcffff } | |
| $sequence_1 | hex | { 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec 668b45f4 6689844a4e720000 0fbf4d08 } | |
| $sequence_2 | hex | { 83c404 33c0 e9???????? 8b85d8fcffff } | |
| $sequence_3 | hex | { 8b4df0 83e901 894df0 837df000 7e21 8b55f8 83e201 } | |
| $sequence_4 | hex | { 6a03 68???????? 8b4508 50 ff15???????? 83c40c 85c0 } | |
| $sequence_5 | hex | { 8b75ec 668b84464e720000 6689844a4e720000 0fbf4df0 8b55ec } | |
| $sequence_6 | hex | { ff15???????? 8945e4 837de4ff 7511 8b4de8 51 ff15???????? } | |
| $sequence_7 | hex | { 66898c504a300000 eb1e 0fbf55fc 8b45e8 0fbf8c504c520000 } | |
| $sequence_8 | hex | { 81c173020000 0fbf55fc 8b45f4 66898c50907e0000 0fbf4dfc 8b55f4 668b45fc } | |
| $sequence_9 | hex | { 0fbf5508 8b45ec 668b8c501c7c0000 66894d08 0fbf5508 8b45ec 668b8c504e720000 } |
Condition
7 of them and filesize < 630784In plain words (Heuristic)
- The file must be smaller than 630784 (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: 06ba101e-9797-5160-8466-c700bf70efc4
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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