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Malware Analysis
Trojan MSIL/Injector - static
Message
<blockquote data-quote="DardiM" data-source="post: 530015" data-attributes="member: 52613"><p>Thanks for your post, very interesting <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite109" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>If I well understand what you explained :</p><p></p><p>In the main function :</p><p></p><p>- calls a function (and sub-function) that allocate memory, gives it <span style="color: #006633">"execute, read-only, or read/write"</span> access (PAGE_EXECUTE_READWRITE access : 64u => x40) , and return a pointer to it (saving the precedent access value on <span style="color: #0000b3">uint num)</span>.</p><p>- writes in this location the content of JDqxMeJQJV (array of bytes)</p><p>- converts the pointer to this location in a delegate (a reference type that can be used to encapsulate a named or an anonymous method) and save it in bTzaXsnJFIxb</p><p>(then JDqxMeJQJV correspond to, like you said, a <span style="color: #b30000">function </span>moved, that will be call later)</p><p></p><p>and later :</p><p>- converts the delegate bTzaXsnJFIxb to a pointer to above <span style="color: #b30000">function</span></p><p>- calls this <span style="color: #b30000">function </span>with <span style="color: #0000b3">bTzaXsnJFIxb()</span>;</p><p></p><p>Am I right ? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite118" alt=":oops:" title="Oops! :oops:" loading="lazy" data-shortname=":oops:" /></p><p></p><p>Proceeding this way should make the functions used less easily readable / understandable on static analysis, a good method <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite109" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>I suppose a lot of important functions used by this malware are called the same way.</p><p></p><p>Please, can you post a screen of JDqxMeJQJV array (if it contains data, in static analysis) ? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite118" alt=":oops:" title="Oops! :oops:" loading="lazy" data-shortname=":oops:" /></p><p>Is this a long array ?</p><p></p><p>I would like to see what it looks like <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite109" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="DardiM, post: 530015, member: 52613"] Thanks for your post, very interesting :) If I well understand what you explained : In the main function : - calls a function (and sub-function) that allocate memory, gives it [COLOR=#006633]"execute, read-only, or read/write"[/COLOR] access (PAGE_EXECUTE_READWRITE access : 64u => x40) , and return a pointer to it (saving the precedent access value on [COLOR=#0000b3]uint num)[/COLOR]. - writes in this location the content of JDqxMeJQJV (array of bytes) - converts the pointer to this location in a delegate (a reference type that can be used to encapsulate a named or an anonymous method) and save it in bTzaXsnJFIxb (then JDqxMeJQJV correspond to, like you said, a [COLOR=#b30000]function [/COLOR]moved, that will be call later) and later : - converts the delegate bTzaXsnJFIxb to a pointer to above [COLOR=#b30000]function[/COLOR] - calls this [COLOR=#b30000]function [/COLOR]with [COLOR=#0000b3]bTzaXsnJFIxb()[/COLOR]; Am I right ? :oops: Proceeding this way should make the functions used less easily readable / understandable on static analysis, a good method :) I suppose a lot of important functions used by this malware are called the same way. Please, can you post a screen of JDqxMeJQJV array (if it contains data, in static analysis) ? :oops: Is this a long array ? I would like to see what it looks like :) [/QUOTE]
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