YARA · Signature Base (Florian Roth / Nextron)
SIGNATURE_BASE_SUSP_OBFUSC_Powershell_True_Jun20_1
Detects indicators often found in obfuscated PowerShell scripts. Note: This detection is based on common characteristics typically associated with the mentioned threats, must be considered a clue and does not conclusively prove maliciousness.
- Auteur
- Florian Roth (Nextron Systems)
- Date
- 2020-06-27
- Modifiée
- 2025-02-12
- Score / Qualité
- 75 / 85
Ce que détecte cette règle
Detects indicators often found in obfuscated PowerShell scripts. Note: This detection is based on common characteristics typically associated with the mentioned threats, must be considered a clue and does not conclusively prove maliciousness.
Elle définit 7 motifs (7 texte, 0 hex, 0 regex).
Résumé généré à partir des métadonnées et de la condition de la règle.
Source de la règle
rule SIGNATURE_BASE_SUSP_OBFUSC_Powershell_True_Jun20_1 : FILE
{
meta:
= "Detects indicators often found in obfuscated PowerShell scripts. Note: This detection is based on common characteristics typically associated with the mentioned threats, must be considered a clue and does not conclusively prove maliciousness."
= "Florian Roth (Nextron Systems)"
= "e9bb870b-ad72-57d3-beff-2f84a81490eb"
= "2020-06-27"
= "2025-02-12"
= "https://github.com/corneacristian/mimikatz-bypass/"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_powershell_obfuscation.yar#L57-L75"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
= "8f33762e6e93fcf6b423b34eb1abefae2ae91b51048303947f7c1601823630d7"
= 75
= 85
= "FILE"
strings:
$ = "${t`rue}" ascii nocase
$ = "${tr`ue}" ascii nocase
$ = "${tru`e}" ascii nocase
$ = "${t`ru`e}" ascii nocase
$ = "${tr`u`e}" ascii nocase
$ = "${t`r`ue}" ascii nocase
$ = "${t`r`u`e}" ascii nocase
condition:
filesize < 6000KB and 1 of them
}
Chaînes (7 motifs)
| Identifiant | Type | Valeur | Modificateurs |
|---|---|---|---|
| $ | texte | "${t`rue}" | ascii nocase |
| $ | texte | "${tr`ue}" | ascii nocase |
| $ | texte | "${tru`e}" | ascii nocase |
| $ | texte | "${t`ru`e}" | ascii nocase |
| $ | texte | "${tr`u`e}" | ascii nocase |
| $ | texte | "${t`r`ue}" | ascii nocase |
| $ | texte | "${t`r`u`e}" | ascii nocase |
Condition
filesize < 6000KB and 1 of themEn clair (Heuristique)
- Le fichier doit faire moins de 6000KB (garde-fou peu coûteux qui écarte les gros fichiers).
- Au moins 1 motifs de la règle doivent être trouvés.
Tester cette règle dans votre navigateur
Déposez un fichier pour le scanner avec cette règle grâce à YARA-X compilé en WebAssembly. Rien n’est envoyé.
Licence et attribution
Auteur : Florian Roth (Nextron Systems)
Dépôt source : Signature Base (Florian Roth / Nextron) @ 94a1c48d7a
Licence : Detection Rule License 1.1 (licence du dépôt)
Reprise via YARA Forge 20260927, qui préfixe les noms de règles par la source et ajoute des champs meta normalisés.
Identifiant de règle: e9bb870b-ad72-57d3-beff-2f84a81490eb
Tags:FILE
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