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#50 AS1/2 function body deobfuscation bug
Author: user pepka
Date created:
Type: bug
Visibility: Everybody
Assigned to:
Labels: AS1/2DecompilationGoogle CodeObfuscated
State: closed Help

<b>What steps will reproduce the problem?</b> Decompile an obfuscated file that contains AS1/2 (most typical for secureSWF). <b>What is the expected output? What do you see instead?</b> In some cases (most typical for branches - if, switch) the source code is skewed. Or even an error arise (Try DoInitAction 35 in the attached file). The inspection has shown that there is a problem while deobfuscating functions with a lot of dead code. An internal addressing of the function could exceed the address of the next (after the function) instruction. Action Push register1 &quot;_tf&quot; is at 2104 Action GetMember is at 2111 Action Push &quot;embedFonts&quot; is at 2112 Action GetMember is at 2117 Action Return is at 2118 Action Push &quot;embedFonts&quot; 3 register2 &quot;addProperty&quot; is at 2119 Action CallMethod is at 2133 Action Pop is at 2134 &lt;&lt;&lt; last instruction of the function's body Action SetMember is at 2091 &lt;&lt;&lt; next address after function Action Push 1 null &quot;mx&quot; is at 2092 Action GetVariable is at 2103 Action Push &quot;styles&quot; is at 2104 Action GetMember is at 2109 Action Push &quot;CSSTextStyles&quot; is at 2110 Action GetMember is at 2115 Action Push &quot;prototype&quot; is at 2116 Action GetMember is at 2121 Action Push 3 &quot;ASSetPropFlags&quot; is at 2122 Action CallFunction is at 2132 Action Pop is at 2133 Action Push is at 2134 This often leads to wrong reference definition: GetMember Return } Push &quot;embedFonts&quot; 3 register2 &quot;addProperty&quot; loc0855:CallMethod &lt;&lt;&lt; wrong location, which is actually taken as it occurs first Pop } SetMember Push 1 null &quot;mx&quot; GetVariable Push &quot;styles&quot; GetMember Push &quot;CSSTextStyles&quot; GetMember Push &quot;prototype&quot; GetMember Push 3 &quot;ASSetPropFlags&quot; CallFunction loc0855:Pop &lt;&lt;&lt; right location Nop <b>What version of the product are you using? On what operating system?</b> 1.4.1u1 Windows 7 64-bit <b>Could you provide the SWF file you have problem with?</b> <b>If the answer is yes, then please attach it here or send me it via email.</b> <b>Could you at least attach PCode source?</b> <b>Do you have the original source code which produced the wrong</b> <b>decompilation? If yes, then please attach it.</b> <b>Please provide any additional information below.</b>
user
What steps will reproduce the problem? Decompile an obfuscated file that contains AS1/2 (most typical for secureSWF). What is the expected output? What do you see instead? In some cases (most typical for branches - if, switch) the source code is skewed. Or even an error arise (Try DoInitAction 35 in the attached file). The inspection has shown that there is a problem while deobfuscating functions with a lot of dead code. An internal addressing of the function could exceed the address of the next (after the function) instruction. Action Push register1 "_tf" is at 2104 Action GetMember is at 2111 Action Push "embedFonts" is at 2112 Action GetMember is at 2117 Action Return is at 2118 Action Push "embedFonts" 3 register2 "addProperty" is at 2119 Action CallMethod is at 2133 Action Pop is at 2134 <<< last instruction of the function's body Action SetMember is at 2091 <<< next address after function Action Push 1 null "mx" is at 2092 Action GetVariable is at 2103 Action Push "styles" is at 2104 Action GetMember is at 2109 Action Push "CSSTextStyles" is at 2110 Action GetMember is at 2115 Action Push "prototype" is at 2116 Action GetMember is at 2121 Action Push 3 "ASSetPropFlags" is at 2122 Action CallFunction is at 2132 Action Pop is at 2133 Action Push is at 2134 This often leads to wrong reference definition: GetMember Return } Push "embedFonts" 3 register2 "addProperty" loc0855:CallMethod <<< wrong location, which is actually taken as it occurs first Pop } SetMember Push 1 null "mx" GetVariable Push "styles" GetMember Push "CSSTextStyles" GetMember Push "prototype" GetMember Push 3 "ASSetPropFlags" CallFunction loc0855:Pop <<< right location Nop What version of the product are you using? On what operating system? 1.4.1u1 Windows 7 64-bit
State: →new
Title: AS1/2 function body deobfuscation bug→AS1/2 function body deobfuscation bug
Type: →bug
Visibility: →Everybody
admin
State: new→opened
admin
Hi, I have moved this issue to new Issue Tracker. You should have received email info about registering there(with specific link) and gaining access to this issue. If you have not received any email, please check your SPAM inbox or write to my email.
admin
Hi, try new version 1.4.3, it should work. Let me know.
State: opened→upgraded
user
Thanks! Now its fixed.
admin
State: upgraded→closed