YARA · Malpedia signator rules
MALPEDIA_Win_Covid22_Auto
autogenerated rule brought to you by yara-signator
MalwareCovid22Malpedia 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: Covid22.
It defines 10 patterns (0 text, 10 hex, 0 regex).
Summary generated from the rule's metadata and condition.
Rule source
win-covid22-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Covid22_Auto : FILE
{
meta:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "99a02a74-d0a3-533c-b448-35480cff51fc"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.covid22"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.covid22_auto.yar#L1-L119"
= "N/A"
= "968cf98e2e8c36cdb3ce45b1a5e5186c5425f3f25bc15cd333cdcc77eeba73ef"
= 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 = { 8a4d78 83c40c f6c102 8975dc 897d08 }
$sequence_1 = { 57 e8???????? 8d7438ff 3bf7 }
$sequence_2 = { 8b3d???????? ffd7 8b4608 85c0 7403 50 ffd7 }
$sequence_3 = { 33d9 81e3ff000000 c1e908 330c9df0904000 0fb65801 }
$sequence_4 = { 89c3 83fb01 7532 ff35???????? }
$sequence_5 = { e8???????? 8d0df4b14000 5a e8???????? 8b442414 e8???????? 50 }
$sequence_6 = { 83c001 8bce c1e908 330c9df0904000 0fb618 33d9 }
$sequence_7 = { 8d0d14b24000 e8???????? ba???????? 8d0d18b24000 e8???????? ba???????? }
$sequence_8 = { c705????????0a4c4000 c705????????304c4000 c705????????01000000 837d1c00 7507 c7451c00904000 }
$sequence_9 = { ba???????? 8d0d10b24000 e8???????? ba???????? 8d0d14b24000 }
condition:
7 of them and filesize < 1955840
}
Strings (10 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { 8a4d78 83c40c f6c102 8975dc 897d08 } | |
| $sequence_1 | hex | { 57 e8???????? 8d7438ff 3bf7 } | |
| $sequence_2 | hex | { 8b3d???????? ffd7 8b4608 85c0 7403 50 ffd7 } | |
| $sequence_3 | hex | { 33d9 81e3ff000000 c1e908 330c9df0904000 0fb65801 } | |
| $sequence_4 | hex | { 89c3 83fb01 7532 ff35???????? } | |
| $sequence_5 | hex | { e8???????? 8d0df4b14000 5a e8???????? 8b442414 e8???????? 50 } | |
| $sequence_6 | hex | { 83c001 8bce c1e908 330c9df0904000 0fb618 33d9 } | |
| $sequence_7 | hex | { 8d0d14b24000 e8???????? ba???????? 8d0d18b24000 e8???????? ba???????? } | |
| $sequence_8 | hex | { c705????????0a4c4000 c705????????304c4000 c705????????01000000 837d1c00 7507 c7451c00904000 } | |
| $sequence_9 | hex | { ba???????? 8d0d10b24000 e8???????? ba???????? 8d0d14b24000 } |
Condition
7 of them and filesize < 1955840In plain words (Heuristic)
- The file must be smaller than 1955840 (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: 99a02a74-d0a3-533c-b448-35480cff51fc
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
Related rules
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
- MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04