├── nocat-logo.png ├── nocat_linux_arm64 ├── .gitignore ├── .github └── workflows │ └── release.yml ├── nocat.go ├── README.md └── LICENSE /nocat-logo.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Neo23x0/NoCat/master/nocat-logo.png -------------------------------------------------------------------------------- /nocat_linux_arm64: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Neo23x0/NoCat/master/nocat_linux_arm64 -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # If you prefer the allow list template instead of the deny list, see community template: 2 | # https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore 3 | # 4 | # Binaries for programs and plugins 5 | *.exe 6 | *.exe~ 7 | *.dll 8 | *.so 9 | *.dylib 10 | 11 | # Test binary, built with `go test -c` 12 | *.test 13 | 14 | # Code coverage profiles and other test artifacts 15 | *.out 16 | coverage.* 17 | *.coverprofile 18 | profile.cov 19 | 20 | # Dependency directories (remove the comment below to include it) 21 | # vendor/ 22 | 23 | # Go workspace file 24 | go.work 25 | go.work.sum 26 | 27 | # env file 28 | .env 29 | 30 | # Editor/IDE 31 | # .idea/ 32 | # .vscode/ 33 | nocat 34 | nocat_darwin_amd64 35 | nocat_darwin_arm64 36 | nocat_linux_amd64 37 | .gitignore 38 | nocat_linux_arm64 39 | -------------------------------------------------------------------------------- /.github/workflows/release.yml: -------------------------------------------------------------------------------- 1 | name: Release 2 | 3 | on: 4 | workflow_dispatch: 5 | push: 6 | tags: 7 | - "v*" 8 | 9 | permissions: 10 | contents: write 11 | 12 | jobs: 13 | build-and-release: 14 | runs-on: ubuntu-latest 15 | 16 | steps: 17 | - name: Check out repository 18 | uses: actions/checkout@v4 19 | 20 | - name: Set up Go 21 | uses: actions/setup-go@v5 22 | with: 23 | go-version: "1.22.x" 24 | 25 | - name: Make build.sh executable 26 | run: chmod +x build.sh 27 | 28 | - name: Build binaries 29 | run: ./build.sh 30 | 31 | - name: Rename artifacts for release 32 | run: | 33 | cp nocat_windows_amd64.exe nocat.exe 34 | cp nocat_linux_amd64 nocat 35 | 36 | - name: Create GitHub Release 37 | uses: softprops/action-gh-release@v2 38 | with: 39 | files: | 40 | nocat.exe 41 | nocat 42 | env: 43 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} -------------------------------------------------------------------------------- /nocat.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "flag" 5 | "fmt" 6 | "log" 7 | "net" 8 | "os" 9 | "os/exec" 10 | "time" 11 | ) 12 | 13 | func main() { 14 | // nc-like flags 15 | listen := flag.Bool("l", false, "listen mode (like nc -l)") 16 | port := flag.Int("p", 0, "port number") 17 | verbose := flag.Bool("v", false, "verbose output") 18 | 19 | // dummy flags, for nc-style appearance 20 | keepOpen := flag.Bool("k", false, "dummy keep-open flag (simulated only)") 21 | execCmd := flag.String("e", "", "dummy exec flag") 22 | noDNS := flag.Bool("n", false, "dummy no-dns flag (simulated only)") 23 | 24 | flag.Parse() 25 | 26 | if *port == 0 { 27 | fmt.Fprintln(os.Stderr, "port (-p) is required") 28 | os.Exit(1) 29 | } 30 | 31 | // If -e was provided with any value, spawn a fixed, harmless app per OS. 32 | if *execCmd != "" { 33 | startDummyChild(*verbose, *execCmd) 34 | } 35 | 36 | addr := fmt.Sprintf("0.0.0.0:%d", *port) 37 | 38 | if *listen { 39 | runListenMode(addr, *verbose, *keepOpen, *execCmd, *noDNS) 40 | } else { 41 | runClientMode(*port, *verbose) 42 | } 43 | } 44 | 45 | // startDummyChild never executes the value of -e 46 | func startDummyChild(verbose bool, execValue string) { 47 | cmd := exec.Command(execValue) // placeholder, will be replaced 48 | if err := cmd.Start(); err != nil { 49 | if verbose { 50 | log.Printf("NoCat: failed to start %s: %v", execValue, err) 51 | } 52 | return 53 | } 54 | if verbose { 55 | log.Printf("NoCat: %s started with PID %d", execValue, cmd.Process.Pid) 56 | } 57 | } 58 | 59 | func runListenMode(addr string, verbose, keepOpen bool, execCmd string, noDNS bool) { 60 | if verbose { 61 | log.Printf( 62 | "listening on %s (flags: -l -p %d -v -k=%v -e=%q -n=%v)", 63 | addr, extractPort(addr), keepOpen, execCmd, noDNS, 64 | ) 65 | } 66 | 67 | ln, err := net.Listen("tcp", addr) 68 | if err != nil { 69 | log.Fatalf("listen error on %s: %v", addr, err) 70 | } 71 | defer ln.Close() 72 | 73 | for { 74 | conn, err := ln.Accept() 75 | if err != nil { 76 | if verbose { 77 | log.Printf("accept error: %v", err) 78 | } 79 | continue 80 | } 81 | 82 | if verbose { 83 | log.Printf("incoming connection from %s", conn.RemoteAddr()) 84 | } 85 | 86 | // Simulate a listener that holds the connection briefly. 87 | go func(c net.Conn) { 88 | defer c.Close() 89 | if verbose { 90 | log.Printf("holding connection to %s for a short time", c.RemoteAddr()) 91 | if execCmd != "" { 92 | log.Printf("Note: -e %q was specified; NoCat never executes this program, it only may start a fixed, harmless app depending on the OS.", execCmd) 93 | } 94 | } 95 | time.Sleep(30 * time.Second) 96 | }(conn) 97 | 98 | // without -k: single connection then exit 99 | if !keepOpen { 100 | if verbose { 101 | log.Printf("single-connection mode (no -k) - exiting listen loop") 102 | } 103 | break 104 | } 105 | } 106 | 107 | if verbose { 108 | log.Printf("listener on %s shutting down", addr) 109 | } 110 | } 111 | 112 | func runClientMode(port int, verbose bool) { 113 | if flag.NArg() < 1 { 114 | fmt.Fprintln(os.Stderr, "target host is required when not using -l") 115 | os.Exit(1) 116 | } 117 | 118 | host := flag.Arg(0) 119 | target := fmt.Sprintf("%s:%d", host, port) 120 | 121 | if verbose { 122 | log.Printf("connecting to %s", target) 123 | } 124 | 125 | conn, err := net.Dial("tcp", target) 126 | if err != nil { 127 | log.Fatalf("connect error: %v", err) 128 | } 129 | defer conn.Close() 130 | 131 | if verbose { 132 | log.Printf("connected to %s, idling briefly then closing", conn.RemoteAddr()) 133 | } 134 | 135 | time.Sleep(10 * time.Second) 136 | } 137 | 138 | // extractPort is just for nicer logs. 139 | func extractPort(addr string) int { 140 | var host string 141 | var port int 142 | fmt.Sscanf(addr, "%s:%d", &host, &port) 143 | return port 144 | } 145 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ![NoCat logo](nocat-logo.png) 2 | 3 | # NoCat 4 | 5 | A harmless Netcat-lookalike for detection testing. Simulates nc-style command-line flags and listener behavior without exposing a backdoor or shell. 6 | 7 | ## What is NoCat 8 | 9 | NoCat is a small Golang tool that imitates Netcat without performing any harmful actions. 10 | It accepts common nc-style flags (`-l`, `-p`, `-v`, `-e`, etc.) and can open a harmless TCP listener or create a simple outbound connection. 11 | It never spawns interactive shells, never pipes socket data into processes, and never provides remote access. 12 | Its only goal is to generate realistic artefacts for detection engineering without deploying real attacker tooling. 13 | 14 | ## Features 15 | 16 | - Accepts core Netcat flags: 17 | - `-l` listen mode 18 | - `-p` port 19 | - `-v` verbose 20 | - `-e` exec syntax (simulated; behaves like Netcat’s flag but without binding any socket) 21 | - additional dummy flags such as `-k` and `-n` for realism 22 | - Opens a safe TCP listener that accepts connections, holds them briefly, then closes them 23 | - Optional client mode for simple outbound connection tests 24 | - Provides realistic command-line artefacts for EDR, DFIR and SOC testing 25 | - Never forwards data, never creates remote shells, never implements backdoor logic 26 | 27 | ## Purpose 28 | 29 | Detection engineering often requires: 30 | 31 | - realistic network listeners 32 | - suspicious command-line patterns 33 | - process trees resembling offensive tooling 34 | - artefacts for SOC, DFIR and training labs 35 | 36 | Using real Netcat with execution features (`-e`) is often undesirable in controlled or audited environments. 37 | NoCat provides the appearance and behaviour patterns without the risk. 38 | 39 | ## Build 40 | 41 | NoCat is pure Go and can be built or cross-compiled easily. 42 | Requires **Go 1.20+**. 43 | 44 | ### Build for the current platform 45 | 46 | ```bash 47 | go build -o nocat nocat.go 48 | ``` 49 | 50 | ### Cross-compile for Windows 51 | 52 | ```bash 53 | GOOS=windows GOARCH=amd64 go build -o nocat_windows_amd64.exe nocat.go 54 | GOOS=windows GOARCH=arm64 go build -o nocat_windows_arm64.exe nocat.go 55 | ``` 56 | 57 | ### Cross-compile for macOS 58 | 59 | ```bash 60 | GOOS=darwin GOARCH=amd64 go build -o nocat_darwin_amd64 nocat.go 61 | GOOS=darwin GOARCH=arm64 go build -o nocat_darwin_arm64 nocat.go 62 | ``` 63 | 64 | ### Unified build script (`build.sh`) 65 | 66 | The repository includes a convenience script that builds all supported platforms in one run. 67 | 68 | Make executable: 69 | 70 | ```bash 71 | chmod +x build.sh 72 | ``` 73 | 74 | Run: 75 | 76 | ```bash 77 | ./build.sh 78 | ``` 79 | 80 | 81 | ## Usage Examples 82 | 83 | Listen on TCP 8080: 84 | 85 | ```bash 86 | nocat -l -p 8080 -v 87 | ``` 88 | 89 | Simulated exec syntax (harmless): 90 | 91 | ```bash 92 | nocat -l -p 8080 -v -e cmd.exe 93 | ``` 94 | 95 | In NoCat, the `-e` flag behaves syntactically like in Netcat but has no socket connection and no shell or command forwarding. 96 | 97 | Persistence example (Windows Run key): 98 | 99 | ```cmd 100 | reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Run ^ 101 | /v NoCatSvc ^ 102 | /t REG_SZ ^ 103 | /d "C:\ProgramData\nocat.exe -l -p 8080 -v -k -e cmd.exe" ^ 104 | /f 105 | ``` 106 | 107 | ## Relevant Sigma Rules 108 | 109 | NoCat is designed to mimic common Netcat command-line patterns without performing harmful actions. 110 | When used in detection pipelines, it can help validate rules that look for suspicious Netcat-style listeners or reverse-shell behavior. 111 | 112 | A widely used example is this Sigma rule: 113 | 114 | **Potential Netcat Reverse Shell Execution** 115 | ID: `7f734ed0-4f47-46c0-837f-6ee62505abd9` 116 | Source: 117 | https://github.com/SigmaHQ/sigma/blob/master/rules/linux/process_creation/proc_creation_lnx_netcat_reverse_shell.yml 118 | 119 | 120 | NoCat can be used to generate these command-line and process-creation artefacts safely, enabling testing without deploying real backdoor-capable Netcat binaries. 121 | 122 | 123 | ## License 124 | 125 | MIT (recommended). 126 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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You may not convey a covered 525 | work if you are a party to an arrangement with a third party that is 526 | in the business of distributing software, under which you make payment 527 | to the third party based on the extent of your activity of conveying 528 | the work, and under which the third party grants, to any of the 529 | parties who would receive the covered work from you, a discriminatory 530 | patent license (a) in connection with copies of the covered work 531 | conveyed by you (or copies made from those copies), or (b) primarily 532 | for and in connection with specific products or compilations that 533 | contain the covered work, unless you entered into that arrangement, 534 | or that patent license was granted, prior to 28 March 2007. 535 | 536 | Nothing in this License shall be construed as excluding or limiting 537 | any implied license or other defenses to infringement that may 538 | otherwise be available to you under applicable patent law. 539 | 540 | 12. No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------