What to do if malicious code has been found in an MBR file

header {margin:52px 0 0 0} #dropdownnavi {float:left; clear:both; margin: -2px 0 20px -12px;} header .row {width:100%} header .row:nth-child(1) {background-color:#0014a0} header .container, footer .container {max-width:1172px; margin: auto;} .top-header {height:53px;} .bottom-header {height:52px;} .Header-logo {width: 10%;float: left;} .Header-logo img {width: 105px; margin: 11px 8px 8px 16px;} .header-top-links {float: right; margin: 1px 29px 0 0;} .header-top-link, .header-bottom-item {cursor: pointer; display: inline-block; font-size: 14px; font-weight: 400; line-height: 52px; margin: 0 15px; position: relative; text-align: center; } .header-top-link, .header-bottom-item a {text-decoration:none;} .header-top-link {color: #fff; margin: 0 10px 0 12px;} .header-top-link.active {margin-right:12px} .header-top-link.active::after {width: calc(100% + 30px)!important} .header-top-link.active::after, .header-top-link:hover::after {background: #fff;} .header-bottom-link {color: #1e1e1e;} .header-bottom-item .header-bottom-link {margin:0 15px} #homeLink {margin-left:1px} .kb-lang-title {width:100%;text-align:center;font-weight:600;color:black; margin:0} .header-right {float: right; margin: 10px 48px 0 0; padding: 3px; height: 30px; border-radius: 3px;} #signin {margin-top:5px} #signin a {text-decoration: none; color:#1e1e1e; } .signin-icon {float: left; height: 20px; padding: 0 5px 20px 0;} #profiledropdown {padding: 2px; border-radius: 3px; margin-top: -3px;} #profiledropdown:hover {cursor:pointer; background-color:#0014a0} #profilename #profileicon {background: #dfdfdf; border-radius: 25px; width: 28px; height: 28px;} #profile-menu ul {list-style: none; padding-left:0} #profile-menu ul li {padding:10px 0 10px 20px;font-size: 15px;} #profile-menu ul li:hover, #articleslink p:hover, #dashboardlink p:hover {cursor:pointer; background-color:#efefef;} #profile-menu ul li a {text-decoration:none; color:#1e1e1e} #profile-menu hr {border:1px solid #efefef} #articleslink hr, #dashboardlink hr {margin:0} #articleslink .title {padding: 0;text-align: center; font-weight: 600;} #articleslink p, #dashboardlink p {padding:10px 0 10px 20px;} #articleslink p a, #dashboardlink p a {text-decoration: none; color:#1e1e1e;} #articleslink .draftslink:hover, #dashboardlink p:hover {padding: 10px 0 10px 20px;} .header-coveosearch {position: relative; margin-top: -53px;} .header-search {display:inline-block;padding:15px 0 0 0;} .searchboxtoggle {color:white;} .header-searchcontainer {float: right; margin:0 18px 0 0; height:52px} .search-icon {color:white;} .expand {display:inline-block;} .collapse {display:none;} .searchboxtoggle .opensearch-icon, .searchboxtoggle .closesearch-icon {cursor:pointer;height:26px; width:26px; vertical-align: middle; filter:invert(1)} .header-searchbox {height:52px;} #kbsearch {display:block;margin: 0 0 0 auto; height:53px; box-sizing: border-box; border: 1px solid white; font-size: 14px; padding: 14px 0 10px 15px;} header-searchbox.active, #kbsearch:focus {width: 100%; transition: 1s ease-in-out;} .Footer {background:#f6f6f6;color:#555a62;font-size:16px;line-height:1.5;padding:18px 0; border-top:1px solid #c4c4c4} .Footer .footer-logo-wrap .footer-logo {height: auto; max-height: 32px; width: auto; margin-top:20px} .Footer .col {padding:0 0 0 15px;width: 20%; font-size: 13px; display: table-cell; vertical-align: top;} .Footer .footer-links-wrap {padding-bottom: 15px; border-bottom: 1px solid #c4c4c4;} .Footer .footer-links-wrap .col:nth-child(2), .Footer .footer-links-wrap .col:nth-child(3), .Footer .footer-links-wrap .col:nth-child(4) {border-right:1px solid #c4c4c4} .Footer .col ul {list-style: none;} .Footer .col:nth-child(2) ul {padding: 0;} .Footer .col ul li a {color: #1e1e1e; text-decoration: none;} .footer-link-title {text-transform: uppercase; color: #1e1e1e;} .footer-link-subtitle {font-size:14px; color: #1e1e1e; max-width:95%} .footer-icon {float: left; height: 30px; padding: 0 10px 60px 0;} .col-copyRight a, .social-icons-wrap a {display:inline-block; padding:5px 0; text-decoration: none; color: #1e1e1e; } .social-icons-wrap {float:right} .Footer a:hover, .Footer .col ul li a:hover {color:#0014a0} footer.Footer .row.bottom-row {padding-top:5px} footer.Footer .row.bottom-row .col.col-copyRight * {font-weight:400} social-link:hover {cursor:pointer} social-link:hover svg {fill:#0014a0} #signin .header-bottom-item.header-bottom-link {display:inline-block; margin-top: -16px;} #signin a:hover {color:#0014a0} @media screen and (max-width:991px){ header {margin:0} header .row:nth-child(1) {height:64px} .Header-logo img {margin: 17px 8px 8px 16px;} .Hamburger-border {position: absolute; right: 60px; border-left: 1px solid #fff; height: 64px; width: 50px; top: 0; z-index: 20; border-right: 1px solid white; padding-right: 10px;} .Hamburger {display:block;position: absolute; top: 8px; left: calc(100% - 52px); z-index: 20;-webkit-box-align: center; -webkit-box-pack: center;-webkit-user-select: none; align-items: center; background: transparent; border: none; border-radius: 0;cursor: pointer;justify-content: center; outline: none;transition: .35s;} .Hamburger-menuXcross {height: 25px; padding: 0; width: 26px;} .Hamburger-menuLines {-o-transition: .35s;-webkit-transition: .35s; background-color: #fff; border-radius: 2px; display: inline-block; height: 2px; position: relative; transition: .35s; width: 26px;} .Hamburger-menuLines::before {top: 6px; } .Hamburger-menuLines::after {top: -6px;} .Hamburger-menuLines::after, .Hamburger-menuLines::before {-ms-transform-origin: 5.5px center;-o-transition: .35s;-webkit-transform-origin: 5.5px center;-webkit-transition: .35s;background-color: #fff;border-radius: 2px; content: ""; display: inline-block; height: 2px;left: 0;position: absolute;transform-origin: 5.5px center;transition: .35s;width: 26px;} .sr-only {position: absolute !important;width: 1px !important;height: 1px !important;padding: 0 !important;margin: -1px !important;overflow: hidden !important;clip: rect(0,0,0,0) !important;border: 0 !important;} .Hamburger-menuXcross.isToggled .Hamburger-menuLines::before {-webkit-transform: rotate(45deg); transform: rotate(45deg);} .Hamburger-menuXcross.isToggled .Hamburger-menuLines::after {-webkit-transform: rotate(-45deg);transform: rotate(-45deg);} .Hamburger-menuXcross.isToggled .Hamburger-menuLines::after, .Hamburger-menuXcross.isToggled .Hamburger-menuLines::before {-ms-transform-origin: 50% 50%;-webkit-transform-origin: 50% 50%;background-color: hsla(0,0%,100%,.6); left: 0;top: 0;transform-origin: 50% 50%;width: 26px;} .Hamburger-menuXcross.isToggled .Hamburger-menuLines {background: transparent;} .isToggled .Hamburger-menuLines {-webkit-transform: scaleX(1);transform: scaleX(1);} #signin {text-align:center; margin: auto; color:white} #signin a {text-decoration: none; color:white;} .header-top-links, .bottom-header {display: none} .header-coveosearch {margin-top:0} .header-searchcontainer {color: white; text-align: right; margin: 8px 18px 0 0;} .header-search { padding: 11px 0 0 0; width: 60px; margin: auto; display: block; position: absolute; right: 17px; top: 8px;} .searchboxtoggle {color:white} .header-searchbox {position: absolute; right: 60px; top: 0; width: 300px;} #kbsearch {height:66px} .banner-middleContainer_f1l0wf96 {box-shadow: inset 0 10px 10px -10px #000;} #homeLink, #helpForumsLink, #FaqsLink, #userguidesLink, #supportLink, .header-right {width:100%; text-align: left; margin: 0; } #userguidesLink, #supportLink {border-top: 1px solid #dfdfdf;} #helpForumsLink, #FaqsLink {margin: 0 0 10px 25px;} .top-header-link {text-transform: uppercase; font-weight:700; color:#1e1e1e; font-size:14px; padding:15px 15px; line-height: 2em;} #dropdownnavi .top-header-link {margin: 3px 0 0 10px;} .header-bottom-link::after {background:none;} .header-bottom-item .header-bottom-link {margin:0 10px} .depth-1-list, .depth-2-list, .depth-3-list {list-style: none; margin: 0; padding:0 0 0 40px} .kb-lang-title {text-align:left;} #menu-dropdown {margin-top: -20px;} #kb-menu-dropdown .depth-2-list.open {padding-left:30px} .depth-1-list a, .depth-2-list a, .depth-3-list a {color:#1e1e1e} .smdropdown-alt {line-height: 0; margin:0 padding: 0 0 10px 0;} .smdropdown-link {color:#acacac!important; font-style: italic;} .depth-1-list, .depth-2-list, .depth-3-list {display: none; margin: -20px 0 20px 0; padding: 0 0 0 15px;} .header-right {float: right;padding: 8px 0; height: 30px; border-radius: 0; box-shadow: 0 3px 5px #1e1e1e; background:#0014a0; text-align: right;} #profiledropdown {width: 30px; float: right; margin-right: 40px} #profiledropdown:hover {background: none} #profiledropdown:hover #profile-menu {display: none} #profileicon {margin-top:2px} #profile-menu {display: none; position: absolute; left: 5%; background: white; width: 90%; text-align: left; z-index: 400; border: 1px solid #dfdfdf; border-radius: 3px; box-shadow: 0 5px 5px #dedede;} .open {display: block;} .Footer .col {display: block; width:90%; padding: 0 20px 15px 20px} .Footer .col.col-copyRight, .Footer .col.col-social {width:90%} footer .container {width:95%} .col.footer-logo-wrap {text-align: center;} .col-copyRight a, .social-icons-wrap a {padding: 10px 0 0 0;} .Footer .footer-links-wrap .col:nth-child(2), .Footer .footer-links-wrap .col:nth-child(3), .Footer .footer-links-wrap .col:nth-child(4) {border-bottom:1px solid #c4c4c4; border-right:none} a.dropdown-1-title, a.dropdown-2-title, a.dropdown-3-title {color: #8a8a8a; font-style: italic;} .signin-icon {display: none;} #signin .header-bottom-item.header-bottom-link {margin-top: -10px;} } @media screen and (min-width:992px){ .Hamburger, .dropdownnavi .top-header-link, #userguidesLink, #supportLink, .smdropdown-alt {display: none;} .bottom-header {display: block;} .header-top-link::after {background: #fff;} header .row:nth-child(2) {background-color:white; box-shadow: 0 3px 5px rgba(0,0,0,0.1);} .depth-1-list, .depth-2-list, .depth-3-list {list-style: none; margin: 0; padding-left: 0; box-shadow: 0 4px 4px rgba(0,0,0,.1);} .depth-1-item, .depth-2-item, .depth-3-item {padding-left:15px; border-bottom:1px solid #dfdfdf; position: relative;} .depth-1-item a, .depth-2-item a, .depth-3-item a {color: #1e1e1e;} .header-bottom-link::after {background: #0014a0;} .header-top-link.active::after, .header-top-link:hover::after, .header-bottom-link.active::after, .header-bottom-link:hover::after {bottom: 0; content: ""; display: block; height: 5px; left: -15px; margin: auto; position: absolute; width: calc(100% + 35px);} .header-bottom-link.smdropdown:hover, .header-bottom-link.smdropdown.active {color:#0014a0} .header-searchbox {position:absolute;top:0;right:60px; margin:0; z-index: 200; } .header-searchbox.active {width:500px;transition: 1s ease-in-out;} #kbsearch {width:350px;} #menu-dropdown, #kb-menu-dropdown {position: absolute; z-index: 100; background: white; text-align: left; margin: 1px 0 0 -15px;} #menu-dropdown, #kb-menu-dropdown .depth-1-list {width:280px} #kb-menu-dropdown .depth-2-list {width:350px!important} #profile-menu {position: absolute; z-index: 100; background: white; width: 350px; text-align: left; width:260px; margin: 0 0 0 -230px; border: 1px solid #c4c4c4; border-radius: 5px; box-shadow: 0 4px 4px rgba(0,0,0,.1);} #menu-dropdown, #menu-dropdown .depth-2-list, #menu-dropdown .depth-3-list, #kb-menu-dropdown, #kb-menu-dropdown .depth-2-list, #profile-menu {display:none;} #helpForumsLink:hover #menu-dropdown, #FaqsLink:hover #kb-menu-dropdown, #profiledropdown:hover #profile-menu {display: block;} #menu-dropdown .depth-1-item:hover .depth-2-list, #menu-dropdown .depth-2-item:hover .depth-3-list, #kb-menu-dropdown .depth-1-item:hover .depth-2-list { display: block; left: calc(100%); background: #fff; border: 1px solid #c4c4c4; position: absolute; top: 0; width: 100%;} #kb-menu-dropdown .depth-1-url {margin:0} #menu-dropdown .depth-1-item:nth-child(3) .depth-2-list, #menu-dropdown .depth-2-item:hover .depth-3-list {top:-1px} .depth-1-item:hover, .depth-2-item:hover, .depth-3-item:hover {pointer:cursor;background-color:#f8f8f8} #helpForumsLink .depth-1-item:hover .depth-1-url, .depth-2-item:hover .depth-2-url, .depth-3-item:hover .depth-3-url, #kb-menu-dropdown .depth-2-item:hover .depth-3-url {color:#0014a0} #FaqsLink .depth-1-item:hover, #FaqsLink .depth-1-item:hover .depth-1-url {cursor:default} .header-right {float: right; margin: 8px 15px 0 0; padding: 3px; height: 30px; border-radius: 3px;} #profiledropdown {padding: 2px; border-radius: 3px; margin-top: -3px;} #dropdownnavi {margin: -1px 0 0 -13px;} #dropdownnavi .top-header-link, .dropdown-1-title, .dropdown-2-title, .dropdown-3-title {display:none} .header-bottom-link.smdropdown {line-height:53px} #signin {display:flex; margin: 1px -12px 0 0} #signin .header-bottom-item.header-bottom-link {margin-top:-14px; height:54px} #signin span {margin-top: 3px;} .signin-icon {padding: 4px 0 20px 0;} .header-bottom-link.smdropdown:before {content:url("data:image/svg+xml;utf8,<svg version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='26px' height='18px' xml:space='preserve'><g><path fill='none' stroke='%23010101' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' stroke-miterlimit='10' d='M13.014,14'/></g><g><path fill='%23010101' d='M13,16c-0.256,0-0.512-0.098-0.707-0.293l-3-3c-0.391-0.391-0.391-1.023,0-1.414s1.023-0.391,1.414,0L13,13.586l2.293-2.293c0.391-0.391,1.023-0.391,1.414,0s0.391,1.023,0,1.414l-3,3C13.512,15.902,13.256,16,13,16z'/> </g> </svg>")!important;float: right;} #helpForumsLink:hover .header-bottom-link.smdropdown::before, #FaqsLink:hover .header-bottom-link.smdropdown::before, .header-bottom-link.smdropdown:hover::before {content:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='26px' height='18px' fill='%23010101'><path d='M16,16c-0.256,0-0.512-0.098-0.707-0.293L13,13.414l-2.293,2.293c-0.391,0.391-1.023,0.391-1.414,0s-0.391-1.023,0-1.414l3-3c0.391-0.391,1.023-0.391,1.414,0l3,3c0.391,0.391,0.391,1.023,0,1.414C16.512,15.902,16.256,16,16,16z'/></svg>")!important;} .depth-1-item:before, #helpForumsLink .depth-2-item:before {content:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='26px' height='18px' fill='%23010101'><path d='M12,17c-0.256,0-0.512-0.098-0.707-0.293c-0.391-0.391-0.391-1.023,0-1.414L13.586,13l-2.293-2.293c-0.391-0.391-0.391-1.023,0-1.414s1.023-0.391,1.414,0l3,3c0.391,0.391,0.391,1.023,0,1.414l-3,3C12.512,16.902,12.256,17,12,17z'/></svg>");float:right;} .depth-1-item:hover::before, #helpForumsLink .depth-2-item:hover::before {content:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='26px' height='18px' fill='%23010101'><path d='M14,17c-0.256,0-0.512-0.098-0.707-0.293l-3-3c-0.391-0.391-0.391-1.023,0-1.414l3-3c0.391-0.391,1.023-0.391,1.414,0s0.391,1.023,0,1.414L12.414,13l2.293,2.293c0.391,0.391,0.391,1.023,0,1.414C14.512,16.902,14.256,17,14,17z'/></svg>")!important;} }

What to do if malicious code has been found in an MBR file - F-Secure Community

Issue:

Malicious code has been found in MBR file (Master Boot Record), how to proceed for further investigation.

Resolution:

Collect the MBR log from the infected machine for further investigation whether it is valid infection or false positive from F-Secure product.

Log Collection Instructions:

Install Sector Inspector "secinspect.msi" on the infected machine and note the installation directory. Download link: https://www.microsoft.com/en-us/download/details.aspx?id=19470
Locate installation directory C:\Program Files\Windows Resource Kits\Tools or C:\Program Files (x86)\Windows Resource Kits\Tools
Execute "secinspect.exe" using cmd with the following argument. secinspect.exe > <log name>MBR.log
Collect "<log name>MBR.log" that was generated
Once the log has been collected, you can uninstall the tool using the same installer file "secinspect.msi" and choose uninstall option

Once "<log name>MBR.log" was collected, please submit through the Submit a Sample service portal (https://www.f-secure.com/en/web/labs_global/submit-a-sample) for further investigation. Select I want to give more details about this sample and to be notified of the analysis results. Malware team will investigate the log and give remediation instructions for further clean up.

Article no: 000006535