Text Bee Baselius

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What is BurpSuite?
Burp Suite is a Java based Web Penetration Testing framework. It has become an industry standard suite of tools used by information security professionals. Burp Suite helps you identify vulnerabilities and verify attack vectors that are affecting web applications. Because of its popularity and breadth as well as depth of features, we have created this useful page as a collection of Burp Suite knowledge and information.

In its simplest form, Burp Suite can be classified as an Interception Proxy. While browsing their target application, a penetration tester can configure their internet browser to route traffic through the Burp Suite proxy server. Burp Suite then acts as a (sort of) Man In The Middle by capturing and analyzing each request to and from the target web application so that they can be analyzed.

Everyone has their favorite security tools, but when it comes to mobile and web applications I've always found myself looking BurpSuite . It always seems to have everything I need and for folks just getting started with web application testing it can be a challenge putting all of the pieces together. I'm just going to go through the installation to paint a good picture of how to get it up quickly.

BurpSuite is freely available with everything you need to get started and when you're ready to cut the leash, the professional version has some handy tools that can make the whole process a little bit easier. I'll also go through how to install FoxyProxy which makes it much easier to change your proxy setup, but we'll get into that a little later.

Requirements and assumptions:

Mozilla Firefox 3.1 or Later Knowledge of Firefox Add-ons and installation The Java Runtime Environment installed

Download BurpSuite from http://portswigger.net/burp/download.htmland make a note of where you save it.

on for Firefox from https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/

If this is your first time running the JAR file, it may take a minute or two to load, so be patient and wait.

Video for setup and installation.

You need to install compatible version of java , So that you can run BurpSuite.

MD5	SHA256	SHA1	Filename	File Tyee	Stage
aa1cf5791a60d56f7ae6da9bb1e7f01e	d5afa3bfd423ba060207ad025467feaa56ac53d13616ac8782a7f63c9fc0fdb4	bdd8b9115d1ae536d0ea1e62052485e5ad10761f	MPSSVC.dll	pe dll	Calypso RAT Payload
1e765fed294a7ad082169819c95d2c85	f6a09372156a8aef96576627a1ed9e57f194b008bb77e32ca29ac89505f933f0	60dda7ccd9ae00701046923b619a1b9c33c8e2ac	Wscntfy.exe	pe exe	Calypso RAT Dropper
17e05041730dcd0732e5b296db16d757	b6c21c26aef75ad709f6c9cfa84bfa15b7ee709588382ce4bc3544a04bceb661	f3301405d8ad5b160747241d6b2a8d88bf6292e8		pe exe	Calypso RAT Dropper
1ed72c14c4aab3b66e830e16ef90b37b	eebff21def49af4e85c26523af2ad659125a07a09db50ac06bd3746483c89f9d	dc0d0a34f107d140d9e47582e17a7fec945403ea	coal.exe	pe exe	Calypso RAT Dropper
e24a62d9826869bc4817366800a8805c	c407c3dde18c9b56ed24492ca257d77a570616074356b8c7854a080823f7ee17	53791c9e7c41931a6becb999fee4eb7daf9b1a11	data01.bin	pe dll	Calypso RAT Dropper
c9c39045fa14e94618dd631044053824	ab39301d45045172ad41c9a89210fdc6f0d3f9dccb567fd733b0dbffbfcfbcc3	1cda28bc307c09508dbb1f3495a967bbcc29326e		pe exe	Calypso RAT Dropper
69322703b8ef9d490a20033684c28493	e6a3b43acdaa824f3280095b10798ea341839f7d43f0460df8989f13c98fa6e0	f203680d97705d99f92fe9797691be6177f5fd41	RasCon.dll	pe dll	Calypso RAT Dropper
85ce60b365edf4beebbdd85cc971e84d	5dfdee5dd680948d19ab4d16df534cf10aca5fa0b157c59659d6517fe897c62f	d9c14f7b6de8e26ae33e41a72ae8e35bb1af4434		pe exe	Calypso RAT Dropper
6347e42f49a86aff2dea7c8bf455a52a	281583aca23f8fd8745dd88a600cbfc578d819859a13957ec022b86c3c1c99f4	8b2a81af85590e0e36efc1c05aa4f0600ea21545	HIDMgr.dll	pe dll	Calypso RAT Dropper
cb914fc73c67b325f948dd1bf97f5733	0031c7b63c1e1cd36d55f585d97e2b21a13a19858d5a1aa5455e5cc64b41e6e9	37ce4d0a3168e3b2f80b3fae38082e68a454aee0		pe exe	Calypso RAT Dropper
c84df4b2cd0d3e7729210f15112da7ac	4e8351ddaff18f7df6fcc27a3c75598e0c56d3b406818d45effb4e78616092c2	41a0c5a1aad36f405c8755613c732591e3300f97	mscorsvw.dll	pe dll	Calypso RAT Dropper
5199ef9d086c97732d97eddef56591ec	511683c8ee62478c2b45be1f782ce678bbe03c4349a1778651414803010b3ee9	d19a786adc09dff84642f2c2e0386193fa2a914b	dnscache.dll	pe dll	FlyingDutchman
06c1d7bf234ce99bb14639c194b3b318	a9a82099aa812d0c4025bee2b34f3b34c1d102773e36f1d50648815913dbe03d	464ab9e11d371bf24de46c98c295d4afe7e957c1	fromResource.exe	pedll	FlyingDutchman
617d588eccd942f243ffa8cb13679d9c	0664b09a86ec2df7dfe01a93e184a1fa23df66ea82cab39000944e418ec1f7b2	1b043fdcb582ed13cbf7dabcef6527762b5be93c		pe dll	Hussar
2807236c2d905a0675878e530ed8b1f8	314e438198f8cc2ee393c75f8e9f2ebd2b5133fd6f2b7deb1178f82782fc6330	2f6fe857632a67e87f4f3631bfa93713ccdf168a	AeLookupMgr.dll	pe dll	Calypso RAT Payload
cce8c8ee42feaed68e9623185c3f7fe4	38cc404437b936660066b71cc87a28af1995248d6d4c471706eb1dd347129b4b	9d2235c911b86bb6ad55d953a2f56ea78c5478e5	AppCert.dll.crt		Calypso RAT Payload
e1a578a069b1910a25c95e2d9450c710	413622ded5d344a5a78de4fea22cfdabdeb4cdccf69e9a1f58f668096c324738	36087a5b0809dc3f9dc5a77355a88e99af491a88	RasCfgMan.dll.crt		Calypso RAT Payload
0d532484193b8b098d7eb14319cefcd3	f8043d6bfc3e63d8561f7f74e65cb7ff1731577ecf6c7559795d9de21298f0fc	31f4c6dc6ce78b4e0439b30c830dfd5d9a3fc4fe	RasCfgMan.dll	pe dll	Calypso RAT Payload
974298eb7e2adfa019cae4d1a927ab07	0461710e681fd6dc9f1c83b57f94a88cd6df9e6432174cbfdd70dfd24577a0f8	41bc37679ce3caeecc176d10b4f8259918e25807	VirtualUMP.dll.crt		Calypso RAT Payload
05f472a9d926f4c8a0a372e1a7193998	8017923cd8169bf951106f053408b425f1eb310a9421685638ead55bb3823db3	8d909bd3450ebe0cffd0cb17b91bc28d23ef5083	EFSProvider.dll.crt		Calypso RAT Payload
d1a1166bec950c75b65fdc7361dcdc63	f3f38c097b0cc5337b7d2dbec098bf6d0a3bb4a3e0336e7b1c8af75268a0a49d	5731350f68a74fb4762c4ea878ecff635588a825	RasCon.dll	pe dll 64bits assembly	Calypso RAT Payload
e3e61f30f8a39cd7aa25149d0f8af5ef	c4dc7519bccc24c53794bf9178e4a4d0823875c34479d01cedbb3e9b10f5c730	1b75ea494c3ac171c5177bdcc263b89a3f24f207	MPSSVC.dll	pe dll	Calypso RAT Payload

There are many goodware and malware developed in pascal, and we will see that the binary generated by the pascal compilers is fascinating, not only because the small and clean generated binaries, or the clarity of the pascal code, but also the good performance. In Linux we have Lazarus which is a good free IDE like Delphi and Kylix the free pascal IDE for windows.

The program:

program strtest;

var
cstr: array[0..10] of char;
s, s2: ShortString;

begin
cstr := 'hello world';
s := cstr;
s2 := 'test';

WriteLn(cstr + ' ' + s + ' ' + s2);
end.

We are going to compile it with freepascal and lazarus, and just the binary size differs a lot:

lazarus 242,176 btytes 845 functions
freepascal 32,256 bytes 233 functions
turbopascal 2,928 bytes 80 functions (wow)

And surprisingly turbopascal binaries are extremely light.
Lets start with lazarus:

Logically it imports from user32.dll some display functions, it also import the kernel32.dll functions and suspiciously the string operations of oleaut32.dll

And our starting point is a function called entry that calls the console initialization and retrieve some console configurations, and then start a labyrinth of function calls.

On functions 10000e8e0 there is the function that calls the main function.

I named execute_param2 because the second param is a function pointer that is gonna be executed without parameters, it sounds like main calling typical strategy.
And here we are, it's clearly the user code pascal main function.

What it seems is that function 100001800 returns an string object, then is called its constructor to initialize the string, then the string is passed to other functions that prints it to the screen.

This function executes the method 0x1c0 of the object until the byte 0x89 is a null byte.
What the hell is doing here?
First of all let's create the function main:

Simply right button create function:

After a bit of work on Ghidra here we have the main:

Note that the struct member so high like 0x1b0 are not created by default, we should import a .h file with an struct or class definition, and locate the constructor just on that position.

The mysterious function was printing byte a byte until null byte, the algorithm the compiler implemented in asm is not as optimized as turbopascal's.

In Windbg we can see the string object in eax after being created but before being initialized:

Just before executing the print function, the RCX parameter is the string object and it still identical:

Let's see the constructor code.
The constructor address can be guessed on static walking the reverse-cross-references to main, but I located it in debugging it in dynamic analysis.

The constructor reads only a pointer stored on the string object on the position 0x98.

And we have that the pointer at 0x98 is compared with the address of the literal, so now we know that this pointer points to the string.
The sentence *string_x98 = literal confirms it, and there is not memory copy, it only points reusing the literal.

Freepascal

The starting labyrinth is bigger than Lazarus so I had to begin the maze from the end, searching the string "hello world" and then finding the string references:

There are two ways to follow the references in Ghidra, one is [ctrl] + [shift] + F but there is other trick which is simply clicking the green references texts on the disassembly.

At the beginning I doubted and put the name possible_main, but it's clearly the pascal user code main function.

The char array initialization Is converted by freepascal compiler to an runtime initialization using mov instructions.

Reducing the coverage on dynamic we arrive to the writeln function:

EAX helds a pointer to a struct, and the member 0x24 performs the printing. In this cases the function can be tracked easily in dynamic executing the sample.

And lands at 0x004059b0 where we see the WriteFile, the stdout descriptor, the text and the size supplied by parameter.

there is an interesting logic of what happens if WriteFile() couldn't write all the bytes, but this is other scope.
Lets see how this functions is called and how text and size are supplied to figure out the string object.

EBX helds the string object and there are two pointers, a pointer to the string on 0x18 and the length in 0x18, lets verify it on windbg.

And here we have the string object, 0x0000001e is the length, and 0x001de8a68 is the pointer.

Thanks @capi_x for the pascal samples.

Text Bee Baselius

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