# CYBERSPACE HACK FRIDAYS 2

A pretty interesting forensics challenge made by <a href="https://twitter.com/k0imet_">Koimet</a>. I got first blood :)

There are only two solves on this chall, which is pretty interesting because CTFroom assured us that the chall was "345y" ( ՞ਊ՞).

### **Data Exfil**
We're given a PCAP file. First question asks, `what is the sha1sum of the exfiltrated file?` I struggled with this question for a while because according to me, it's asking for the sha1sum of the exfiltrated data. This meant i had to extract the exfiltrated data first, most likely being a file and then get the sha1sum. But, turns out, it expected the sha1sum of the pcap file, lol!

➜  Fri Aug 5 2022_COMPLETE sha1sum Challenge.pcap | awk -F' ' '{print $1}'                              
3101a3746b7b3691c01fe48a70b9abfa8ca5ed23

You could just use sha1sum like that. You could also use capinfos.

➜  Fri Aug 5 2022_COMPLETE capinfos Challenge.pcap | grep -i "sha1" | awk -F':' '{print $2}' | tr -d " "
3101a3746b7b3691c01fe48a70b9abfa8ca5ed23

The second question asks, `what's the flag that you got from the exfiltrated file?`
From here, i opened the file in wireshark and noticed something interesting.

Noticed there's an ICMP packet. So i decided to only filter the packets that are ICMP. And to do that you just type "icmp" in the display filter. So, if you know ICMP, you know that technically it's supposed to send various messages to report network conditions and apparently an echo request is one of the many messages.

Looking at the ICMP data, noticed something interesting.

Copied the data value and pasted it on cyberchef.

Seems to be hex encoded twice and then the first bytes are of a PNG file.

But then there's just one problem. As you can see, the rendered image doesn't look complete right? What i thought of doing here was, grabbing all the icmp data from all the echo requests and then decoding the hex to form an image? I used `tshark` to do this ofcourse.

➜  Fri Aug 5 2022_COMPLETE tshark -r Challenge.pcap -Tfields -Y icmp -e data | uniq | tr -d "\n" > hex.txt

I used uniq here because by default, tshark is going to grab the data from both the echo request and echo reply. Then i just removed the new lines so that all the hex is on one line.

➜  Fri Aug 5 2022_COMPLETE cat hex.txt | xxd -r -p | xxd -r -p > flag.png

And now, you should get a proper kinda image and the flag as well. That's the chall! Pretty fun i should say.

<style>
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font-family: "Roboto", "Noto Sans", "Open Sans", "sans-serif";
display: inline-flex;
color: #fff;
border-radius: 5px;
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padding: .4em .8em;
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<div class="twitter" style="height: 110px; width: 300px;"><a target="_blank" rel="noopener noreferrer" href="https://twitter.com/mug3njutsu">
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/* scroll bar */
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/* info bar */
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/* permission */
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background: #202020;
color: #eee;
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.select2-results .select2-no-results,
.select2-results .select2-searching,
.select2-results .select2-ajax-error,
.select2-results .select2-selection-limit {
background: #202020;
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/* table of contents block*/
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width: 42vw;
max-height: 90vh;
overflow: auto;
text-align: inherit;
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/* table of contents text*/
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font-weight: bold;
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/* table of contents text: active*/
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/* table of contents text: focus, hover*/
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/* drop down floating table of contents */
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/*--------------- editor ---------------*/
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color: #ddd;
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color: #b0ee83;
}

.cm-s-one-dark .CodeMirror-linenumber {
color: #666;
}

.cm-strong {
color: #f4511e;
}

.cm-s-one-dark .cm-comment {
color: #a9a9a9;
}

.cm-matchhighlight {
color: #ffea00;
}

.cm-positive {
color: #11bf64;
}

.cm-negative {
color: #ff3e3e;
}

.dropdown-menu.CodeMirror-other-cursor {
border: 2px solid #4d4d4d;
background-color: #202020;
}

.dropdown-menu.CodeMirror-other-cursor li a {
color: #ececec;
}

/*--------------- book mode ---------------*/
.topbar {
background: #1e1e1e;
}

.btn.focus,
.btn:focus,
.btn:hover {
color: #fff;
background-color: #333;
}

.summary {
background: #1e1e1e;
}

.summary,
.toolbar {
background: #1e1e1e !important;
border-color: #4d4d4d !important;
}

.toolbar i {
color: #fff;
}

.summary h1,
.summary h2,
.summary h3 .summary hr {
color: #ddd;
border-color: #777 !important;
}

.summary .nav>li>a {
color: #7bf;
}

.summary .nav-pills>li.active>a,
.summary .nav-pills>li.active>a:focus,
.summary .nav-pills>li.active>a:hover {
color: #ff9100;
}

.ui-summary-search {
font-size: 16px;
border: 1px solid #6D6D6D;
background-color: #333;
color: #FFF;
}

.summary h1,
.summary h2,
.summary h3,
.summary h4,
.summary h5,
.summary h6 {
border-color: #454545;
}

/* fix body background color to dark */
div[class$=container-mask] {
background: #1e1e1e;
z-index: 1;
display: block;
}

/* notification */
.dropdown.ui-notification .ui-notification-label,
.dropdown.ui-invitee .ui-invitee-label {
color: #eee;
border-color: #6a6a6a;
}

.ui-notification .dropdown-menu {
border-top: 1px solid #555;
}

/*--------------- help ---------------*/
.modal-header {
background-color: #2a2a2a;
}

.panel-default {
border-color: #6d6d6d;
}

.panel-default>.panel-heading {
background-color: #2a2a2a;
color: #eee;
border-color: #6d6d6d;
}

.panel-body {
background: #2e2e2e;
}

.panel-body a {
color: #7bf;
}

.table>tbody>tr>td,
.table>tbody>tr>th,
.table>tfoot>tr>td,
.table>tfoot>tr>th,
.table>thead>tr>td,
.table>thead>tr>th {
border-color: #6d6d6d;
}

/*--------------- comment ---------------*/
.ui-comment-container .ui-comment-header {
background-color: #2a2a2a;
color: #eee;
border-color: #6d6d6d;
}

.ui-comment-container {
background-color: #2e2e2e;
border-color: #6d6d6d;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-author {
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .timestamp {
color: #aaa;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-content {
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu {
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu .comment-dropdown-menu {
background: #222;
color: #eee;
border-color: #555;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu .comment-dropdown-menu>div:hover {
background-color: #555555;
color: #eee;
}

.ui-comment-container .ui-comments-container .ui-comment .comment-menu:hover,
.ui-comment-container .ui-comments-container .ui-comment .comment-menu:active,
.ui-comment-container .ui-comments-container .ui-comment .comment-menu.active {
background-color: #737373;
color: #eee;
}

.ui-comment-container .ui-comment-input-container {
background-color: #3c3c3c;
}

.ui-comment-container textarea {
background-color: #3e4045;
color: #eee;
border: 1px solid #6d6d6d;
}

.ui-comment-container textarea::placeholder,
.ui-comment-container textarea::-webkit-input-placeholder,
.ui-comment-container textarea:-moz-placeholder,
.ui-comment-container textarea::-moz-placeholder,
.ui-comment-container textarea:-ms-input-placeholder {
color: #eee;
}

@keyframes highlight {
0% {
background-color: #3c3c3c;
}

30% {
background-color: #3c3c3c;
}

100% {
background-color: transparent;
}
}

/*--------------- template ---------------*/
.template-content .modal-header {
background: #2a2a2a;
}

.template-content .close {
color: #fff;
}

.template-content .modal-title {
color: #eee;
}

.template-content .ui-templates-container {
border-color: #6d6d6d;
}

.ui-templates-container .ui-create-template-btn {
background: #446fab;
color: #fff;
}

.ui-template-list-filter .ui-template-list-filter-label,
.ui-template-list-filter .ui-template-list-filter-label:hover {
color: #eee;
}

.ui-template-list .list-group-item.active {
background: #4d4d4d;
}

.ui-template-list .list-group-item.active:focus {
background: #4d4d4d !important;
}

.list-group-item.active,
.list-group-item.active:focus,
.list-group-item.active:hover {
color: #eee;
}

.ui-template-list .list-group-item .list-group-item-heading {
color: #eee;
}

.ui-template-list .list-group-item.active .list-group-item-heading {
color: #eee;
}

.ui-template-list .list-group-item:hover {
background: #4d4d4d !important;
}

.ui-template-item-menu {
color: #eee !important;
}

.ui-template-list .list-group-item {
color: #fff;
}

.ui-template-list .list-group-item .dropdown-container.open {
background-color: #2a2a2a;
}

.ui-template-list .list-group-item .dropdown-container:hover {
background-color: #2a2a2a !important;
}

.template-menu .more-template {
border-color: #6d6d6d;
}

.template-menu .more-template:hover {
color: #eee;
border-color: #6d6d6d;
}

/*--------------- code mirror ---------------*/
.modal-content {
background: #1f2226;
}

.modal-header {
border-bottom: 1px solid #46484f;
}

.modal-footer {
border-top: 1px solid #46484f;
}

a.list-group-item {
background: #1f2226;
color: #ddd;
border: 1px solid #46484f;
}

a.list-group-item .list-group-item-heading {
color: #ddd;
}

a.list-group-item:focus,
a.list-group-item:hover {
background: #434651;
color: #ddd;
}

button.close {
color: #ddd;
opacity: .5;
}

.close:focus,
.close:hover {
color: #fff;
opacity: .8;
}

.CodeMirror {
background: #1f2226;
}

.CodeMirror-gutters {
background: #1f2226;
border-right: 1px solid rgba(204, 217, 255, 0.1);
}

.cm-s-default .cm-comment {
color: #888;
}

.cm-s-default .cm-quote {
color: #ddd;
}

.cm-s-default .cm-header {
color: #ffa653;
}

.cm-s-default .cm-link {
color: #b0ee83;
}

.cm-s-default .cm-string,
.cm-s-default .cm-variable-2 {
color: #7bf;
}

.cm-s-default .cm-def {
color: #c678dd;
}

.cm-s-default .cm-number,
.cm-s-default .cm-attribute,
.cm-s-default .cm-qualifier,
.cm-s-default .cm-plus,
.cm-s-default .cm-atom {
color: #eda35e;
}

.cm-s-default .cm-property,
.cm-s-default .cm-variable,
.cm-s-default .cm-variable-3,
.cm-s-default .cm-operator,
.cm-s-default .cm-bracket {
color: #f76e79;
}

.cm-s-default .cm-keyword,
.cm-s-default .cm-builtin,
.cm-s-default .cm-tag {
color: #98c379;
}

.modal-title {
color: #ccc;
}

.modal-body {
color: #ccc !important;
}

div[contenteditable]:empty:not(:focus):before {
color: #aaa;
}

.CodeMirror pre {
color: #ddd;
}

.CodeMirror pre span[style^="background-color: rgb(221, 251, 230)"] {
background-color: #288c27 !important;
}

.CodeMirror pre span[style^="background-color: rgb(249, 215, 220)"] {
background-color: #a52721 !important;
}

/*------- code highlight: Visual Stutdio Code theme for highlight.js -------*/
.hljs {
background: #1E1E1E;
color: #DCDCDC;
}

.hljs-keyword,
.hljs-literal,
.hljs-symbol,
.hljs-name {
color: #569CD6;
}

.hljs-link {
color: #569CD6;
text-decoration: underline;
}

.hljs-built_in,
.hljs-type {
color: #4EC9B0;
}

.hljs-number,
.hljs-class {
color: #B8D7A3;
}

.hljs-string,
.hljs-meta-string {
color: #D69D85;
}

.hljs-regexp,
.hljs-template-tag {
color: #d16969;
}

.hljs-title {
color: #dcdcaa;
}

.hljs-subst,
.hljs-function,
.hljs-formula {
color: #DCDCDC;
}

.hljs-comment,
.hljs-quote {
color: #57A64A;
}

.hljs-doctag {
color: #608B4E;
}

.hljs-meta,
.hljs-meta-keyword,
.hljs-tag {
color: #9B9B9B;
}

.hljs-variable,
.hljs-template-variable {
color: #BD63C5;
}

.hljs-params,
.hljs-attr,
.hljs-attribute,
.hljs-builtin-name {
color: #9CDCFE;
}

.hljs-section {
color: gold;
}

.hljs-emphasis {
font-style: italic;
}

.hljs-strong {
font-weight: bold;
}

/*
.hljs-code {
font-family:'Monospace';
}
*/

.hljs-bullet,
.hljs-selector-tag,
.hljs-selector-id,
.hljs-selector-class,
.hljs-selector-attr,
.hljs-selector-pseudo {
color: #D7BA7D;
}

.hljs-addition {
background-color: #155a36;
color: #dfdfdf;
display: inline-block;
width: 100%;
}

.hljs-deletion {
background-color: #872e2e;
color: #dfdfdf;
display: inline-block;
width: 100%;
}

/*---------- code highlight: Visual Stutdio Code theme for Prism.js ----------*/
code[class*="language-"],
pre[class*="language-"] {
color: #DCDCDC;
}

:not(pre)>code[class*="language-"],
pre[class*="language-"] {
background: #1E1E1E;
}

.token.comment,
.token.block-comment,
.token.prolog,
.token.cdata {
color: #57A64A;
}

.token.doctype,
.token.punctuation {
color: #9B9B9B;
}

.token.tag,
.token.entity {
color: #569CD6;
}

.token.attr-name,
.token.namespace,
.token.deleted,
.token.property,
.token.builtin {
color: #9CDCFE;
}

.token.function,
.token.function-name {
color: #dcdcaa;
}

.token.boolean,
.token.keyword,
.token.important {
color: #569CD6;
}

.token.number {
color: #B8D7A3;
}

.token.class-name,
.token.constant {
color: #4EC9B0;
}

.token.symbol {
color: #f8c555;
}

.token.rule {
color: #c586c0;
}

.token.selector {
color: #D7BA7D;
}

.token.atrule {
color: #cc99cd;
}

.token.string,
.token.attr-value {
color: #D69D85;
}

.token.char {
color: #7ec699;
}

.token.variable {
color: #BD63C5;
}

.token.regex {
color: #d16969;
}

.token.operator {
color: #DCDCDC;
background: transparent;
}

.token.url {
color: #67cdcc;
}

.token.important,
.token.bold {
font-weight: bold;
}

.token.italic {
font-style: italic;
}

.token.entity {
cursor: help;
}

.token.inserted {
color: green;
}

/*---------- code highlight: dark theme for Gist ----------*/
.gist .gist-file {
border: 1px solid #555;
}

.gist .gist-data {
background-color: #1e1e1e;
border-bottom: 1px solid #555;
}

.gist .gist-meta {
background-color: #424a55;
color: #eee;
}

.gist .gist-meta a {
color: #eee;
}

.gist .highlight {
color: #eee;
background-color: #1e1e1e;
}

.gist .blob-num {
color: #afafaf;
}

.gist .blob-code-inner {
color: #dfdfdf;
}

.pl-mb {
color: #fff !important;
}

.pl-c {
color: #57A64A !important;
}

/* comment */
.pl-ent {
color: #569CD6 !important;
}

/* entity */
.pl-e {
color: #9CDCFE !important;
}

.pl-en {
color: #4EC9B0 !important;
}

/* entity attribute */
.pl-smi {
color: #9CDCFE !important;
}

.pl-k {
color: #569cd6 !important;
}

.pl-c1,
.pl-s .pl-v {
color: #4EC9B0 !important;
}

.pl-pds,
.pl-s,
.pl-s .pl-pse .pl-s1,
.pl-sr,
.pl-sr .pl-cce,
.pl-sr .pl-sra,
.pl-sr .pl-sre,
.pl-s .pl-s1 {
color: #D69D85 !important;
}

.pl-s .pl-s1 .pl-pse {
color: #c5dbff !important;
}

/* strings */
.diff-table .pl-c,
.diff-table .pl-ent,
.diff-table .pl-e,
.diff-table .pl-en,
.diff-table .pl-pds,
.diff-table .pl-s,
.diff-table .pl-s .pl-s1,
.diff-table .pl-s .pl-pse .pl-s1,
.diff-table .pl-sr,
.diff-table .pl-sr .pl-cce,
.diff-table .pl-sr .pl-sra,
.diff-table .pl-sr .pl-sre,
.diff-table .pl-k,
.diff-table .pl-smi,
.diff-table .pl-c1,
.diff-table .pl-v {
color: #eee !important;
}

</style>