MAR-10334587-2.v1: Pulse Connect Secure
Summary
body#cma-body {
font-family: Franklin Gothic Medium, Franklin Gothic, ITC Franklin Gothic, Arial, sans-serif;
font-size: 15px;
}
table#cma-table {
width: 900px;
margin: 2px;
table-layout: fixed;
border-collapse: collapse;
}
div#cma-exercise {
width: 900px;
height: 30px;
text-align: center;
line-height: 30px;
font-weight: bold;
font-size: 18px;
}
div.cma-header {
text-align: center;
margin-bottom: 40px;
}
div.cma-footer {
text-align: center;
margin-top: 20px;
}
h2.cma-tlp {
background-color: #000;
color: #ffffff;
width: 180px;
height: 30px;
text-align: center;
line-height: 30px;
font-weight: bold;
font-size: 18px;
float: right;
}
span.cma-fouo {
line-height: 30px;
font-weight: bold;
font-size: 16px;
}
h3.cma-section-title {
font-size: 18px;
font-weight: bold;
padding: 0 10px;
margin-top: 10px;
}
h4.cma-object-title {
font-size: 16px;
font-weight: bold;
margin-left: 20px;
}
h5.cma-data-title {
padding: 3px 0 3px 10px;
margin: 10px 0 0 20px;
background-color: #e7eef4;
font-size: 15px;
}
p.cma-text {
margin: 5px 0 0 25px !important;
word-wrap: break-word !important;
}
div.cma-section {
border-bottom: 5px solid #aaa;
margin: 5px 0;
padding-bottom: 10px;
}
div.cma-avoid-page-break {
page-break-inside: avoid;
}
div#cma-summary {
page-break-after: always;
}
div#cma-faq {
page-break-after: always;
}
table.cma-content {
border-collapse: collapse;
margin-left: 20px;
}
table.cma-hashes {
table-layout: fixed;
width: 880px;
}
table.cma-hashes td{
width: 780px;
word-wrap: break-word;
}
.cma-left th {
text-align: right;
vertical-align: top;
padding: 3px 8px 3px 20px;
background-color: #f0f0f0;
border-right: 1px solid #aaa;
}
.cma-left td {
padding-left: 8px;
}
.cma-color-title th, .cma-color-list th, .cma-color-title-only th {
text-align: left;
padding: 3px 0 3px 20px;
background-color: #f0f0f0;
}
.cma-color-title td, .cma-color-list td, .cma-color-title-only td {
padding: 3px 20px;
}
.cma-color-title tr:nth-child(odd) {
background-color: #f0f0f0;
}
.cma-color-list tr:nth-child(even) {
background-color: #f0f0f0;
}
td.cma-relationship {
max-width: 310px;
word-wrap: break-word;
}
ul.cma-ul {
margin: 5px 0 10px 0;
}
ul.cma-ul li {
line-height: 20px;
margin-bottom: 5px;
word-wrap: break-word;
}
#cma-survey {
font-weight: bold;
font-style: italic;
}
div.cma-banner-container {
position: relative;
text-align: center;
color: white;
}
img.cma-banner {
max-width: 900px;
height: auto;
}
img.cma-nccic-logo {
max-height: 60px;
width: auto;
float: left;
margin-top: -15px;
}
div.cma-report-name {
position: absolute;
bottom: 32px;
left: 12px;
font-size: 20px;
}
div.cma-report-number {
position: absolute;
bottom: 70px;
right: 100px;
font-size: 18px;
}
div.cma-report-date {
position: absolute;
bottom: 32px;
right: 100px;
font-size: 18px;
}
img.cma-thumbnail {
max-height: 100px;
width: auto;
vertical-align: top;
}
img.cma-screenshot {
margin: 10px 0 0 25px;
max-width: 800px;
height: auto;
vertical-align: top;
border: 1px solid #000;
}
div.cma-screenshot-text {
margin: 10px 0 0 25px;
}
.cma-break-word {
word-wrap: break-word;
}
.cma-tag {
border-radius: 5px;
padding: 1px 10px;
margin-right: 10px;
}
.cma-tag-info {
background: #f0f0f0;
}
.cma-tag-warning {
background: #ffdead;
}
NotificationThis report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained herein. The DHS does not endorse any commercial product or service referenced in this bulletin or otherwise. This document is marked TLP:WHITE--Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol (TLP), see http://www.cisa.gov/tlp. SummaryDescriptionCISA received one file for analysis. The file is a modified Pulse Secure Perl Common Gateway Interface (CGI) script. The modified script functions as a webshell that hijacks two legitimate inputs. This analysis is derived from malicious files found on Pulse Connect Secure devices. For a downloadable copy of IOCs, see: MAR-10334587-2.v1.WHITE.stix. Submitted Files (1)0460f9c22127055b337d2b67ee782e7454dc13e7993430020e62518654cb045b (tnchcupdate.cgi) Findings0460f9c22127055b337d2b67ee782e7454dc13e7993430020e62518654cb045bTagswebshell Details
AntivirusNo matches found. YARA RulesNo matches found. ssdeep MatchesNo matches found. DescriptionThis is a modified Pulse Secure Perl CGI script that functions as a webshell. It is used to hijack two legitimate inputs 'hmacTime' and 'deviceid' and allows the attacker to activate and run remote commands. The main function contains malicious code that accepts the attacker's inputs via parameter 'hmacTime' and parameter 'deviceid'. The input parameter 'hmacTime' from the attacker is RC4 encrypted and base64 encoded. The 'deviceid' is compared with a hard-coded value that works as an authorization key to access the webshell. If it matches, the input parameter 'hmacTime' will be base64 decoded and RC4 decrypted by the function checkTimeP with a hard-coded key. The decrypted command will be executed in function checkUserTime using popen. The output of the command will be RC4 encrypted with a hard-coded key and base64 encoded in function checkTimeU. RecommendationsCISA recommends that users and administrators consider using the following best practices to strengthen the security posture of their organization's systems. Any configuration changes should be reviewed by system owners and administrators prior to implementation to avoid unwanted impacts.
Additional information on malware incident prevention and handling can be found in National Institute of Standards and Technology (NIST) Special Publication 800-83, "Guide to Malware Incident Prevention & Handling for Desktops and Laptops". Contact Information
CISA continuously strives to improve its products and services. You can help by answering a very short series of questions about this product at the following URL: https://us-cert.cisa.gov/forms/feedback/ Document FAQWhat is a MIFR? A Malware Initial Findings Report (MIFR) is intended to provide organizations with malware analysis in a timely manner. In most instances this report will provide initial indicators for computer and network defense. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis. What is a MAR? A Malware Analysis Report (MAR) is intended to provide organizations with more detailed malware analysis acquired via manual reverse engineering. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis. Can I edit this document? This document is not to be edited in any way by recipients. All comments or questions related to this document should be directed to the CISA at 1-888-282-0870 or CISA Service Desk. Can I submit malware to CISA? Malware samples can be submitted via three methods:
CISA encourages you to report any suspicious activity, including cybersecurity incidents, possible malicious code, software vulnerabilities, and phishing-related scams. Reporting forms can be found on CISA's homepage at www.cisa.gov. |
Revisions
July 21, 2021: Initial Version