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New Jupyter Infostealer Version Emerges with Sophisticated Stealth Tactics
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<blockquote data-quote="Andy Ful" data-source="post: 1064268" data-attributes="member: 32260"><p>PowerShell mostly blocks such attacks in Constrained Language Mode (CLM).</p><p>In this example, the malware connects with C2 server by using the methods blocked by CLM:</p><p> [Text.Encoding]::UTF8.GetString()</p><p>[IO.File]::ReadAllBytes()</p><p></p><p>Next, the malware decodes the Infostealer payload (from .dat file) by using other methods blocked by CLM:</p><p>[Convert]::FromBase64String()</p><p>New-Object System.Security.Cryptography.AesCryptoServiceProvider</p><p></p><p>Finally, it loads the DLL payload in-memory (Infostealer) by using another method blocked by CLM</p><p>[Reflection.Assembly]::Load()</p><p></p><p>Edit.</p><p>One can confirm that CLM blocks these methods by executing them in the PowerShell console. The execution will end with error:</p><p>"Cannot invoke method. Method invocation is supported only on core types in this language mode."</p></blockquote><p></p>
[QUOTE="Andy Ful, post: 1064268, member: 32260"] PowerShell mostly blocks such attacks in Constrained Language Mode (CLM). In this example, the malware connects with C2 server by using the methods blocked by CLM: [Text.Encoding]::UTF8.GetString() [IO.File]::ReadAllBytes() Next, the malware decodes the Infostealer payload (from .dat file) by using other methods blocked by CLM: [Convert]::FromBase64String() New-Object System.Security.Cryptography.AesCryptoServiceProvider Finally, it loads the DLL payload in-memory (Infostealer) by using another method blocked by CLM [Reflection.Assembly]::Load() Edit. One can confirm that CLM blocks these methods by executing them in the PowerShell console. The execution will end with error: "Cannot invoke method. Method invocation is supported only on core types in this language mode." [/QUOTE]
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