Comments on: SpiderMonkey

By: Didier Stevens

Didier Stevens — Fri, 01 Jan 2010 14:13:38 +0000

@Js.Newbie Yes, but this shouldn’t be a problem as you now several imperative programming languages. And you’ll need to read the JavaScript specification of the engine you want to emulate.

By: Js.Newbie

Js.Newbie — Thu, 24 Dec 2009 14:48:13 +0000

Yes i do. I use C, C++ and Java. Ah yeah. I now too have to study Ruby. I’ve just understood what my task actually is about. I need to code a program in Ruby of which it can analyze any malicious JavaScript. (Here i still need to learn JavaScript,needn’t i?)

By: Didier Stevens

Didier Stevens — Thu, 24 Dec 2009 11:18:44 +0000

Do you have any programming experience in another language?

By: Js.Newbie

Js.Newbie — Thu, 24 Dec 2009 08:26:17 +0000

Hi! I’ve never used JavaScript before. But now i’ve to start learning and using it. I’ve been given a project related to malicious JavaScript and my senior here asked me to begin reading about SpiderMonkey, Libemu, Malzilla, Jsunpack etc. Here i’d like to ask help from you, are there any links on tutorials that are possibly very good for a total beginner like me, that you would suggest?

Thanks in advance for any help from you.

By: Didier Stevens

Didier Stevens — Sat, 19 Dec 2009 10:31:24 +0000

Thanks for the info. What compiler did you use?

By: bgh

bgh — Wed, 16 Dec 2009 21:49:06 +0000

I know this is an old thread, but a co-worker asked me to build a copy for him today and I discovered something.

The unresolved _snprintf is due to a couple of calls to snprintf in jsobj.c that should be replaced with JS_snprintf like all of the others. This fixed the unresolved external for me and I was able to compile for Windows the “normal” way.

By: Didier Stevens

Didier Stevens — Tue, 26 May 2009 09:49:05 +0000

Not yet, it’s on my todo list.

By: Sebastian

Sebastian — Tue, 26 May 2009 08:34:10 +0000

Have you been able to patch spidermonkey 1.9?

By: Didier Stevens

Didier Stevens — Sat, 17 Jan 2009 15:28:15 +0000

Looks like you’re not linking the library with snprintf (or it’s not included in the library). You could try to edit the code and replace snprintf with sprintf (remove the length argument).

Paul Melson has compiled it: http://pmelson.blogspot.com/2007/12/building-didier-stevens-spidermonkey-in.html

By: Chris Blazek

Chris Blazek — Fri, 16 Jan 2009 22:16:41 +0000

Has anybody had any luck building this version under vista? I get the following error:

jsobj.obj : error LNK2019: unresolved external symbol _snprintf referenced in fu
nction _obj_eval
WINNT6.0_DBG.OBJ/js32.dll : fatal error LNK1120: 1 unresolved externals
make[1]: *** [WINNT6.0_DBG.OBJ/js32.dll] Error 96
make[1]: Leaving directory `/d/Code/Personal/js-1.7.0-mod/js/src’

I am using the make file from the python-spidermonkey source in google code (hxxp://code.google.com/p/python-spidermonkey/source/browse/trunk/js/src/config/WINNT6.0.mk).

I’d appreciate any help.

Chris