Unknown Threat Actor Uses Chaos Ransomware Variant Yashma To Target English Speaking Countries In Addition To Bulgaria, China and Vietnam

Indicators of Compromise

Notes

<div><b>Conclusion</b></div><div><b><br></b></div><div>Chaos (and subsequently Yashma) have seen rapid development and advances throughout the last year, with its most recent iteration, “Yashma” (Chaos v6.0), found in-the-wild in mid-2022.</div><div><br></div><div><span style="color: var(--q-dark);">Chaos started as a relatively basic attempt at a .NET compiled ransomware that instead functioned as a file-destructor or wiper. Over time it has evolved to become a full-fledged ransomware, adding additional features and functionality with each iteration.</span></div><div><span style="color: var(--q-dark);"><br></span></div><div><span style="color: var(--q-dark);">What makes Chaos/Yashma dangerous going forward is its flexibility and its widespread availability. As the malware is initially sold and distributed as a malware builder, any threat actor who purchases the malware can replicate the actions of the threat group behind Onyx, developing their own ransomware strains and targeting chosen victims.</span></div><div><span style="color: var(--q-dark);"></span><span style="color: var(--q-dark);"><br></span></div><div><span style="color: var(--q-dark);">This makes tracking ransomware attacks attributed to Chaos quite difficult, as Indicators of Compromise (IOCs) can change with each sample a malware builder produces. Additionally, even the most novice threat actors can find links to releases and leaks of this threat on either dark web forums or third-party malware repositories, and then use Chaos/Yashma to carry out future malicious activities.</span><br></div><div><br></div>

Mitigation

<div><b>MITIGATION</b></div><div><span style="color: var(--q-dark);">In order to avoid becoming a victim of Chaos/Yashma:</span></div><div><ul><li><span style="color: var(--q-dark);">Keep updated backups in case of data destruction, file-loss or file-corruption.</span></li><li>Have a ransomware business continuity plan ready to be put into action.</li><li>Avoid and report suspicious links and files.</li></ul></div><div><br></div><div><b>Chaos</b></div><div>Chaos is Linux malware that compromises systems by brute force attacks against SSH services. Once installed, it provides a reverse shell to its controllers, triggered by unsolicited packets. [1]</div><div><br></div><div><div><b>Techniques Used</b></div></div><div><b><br></b></div><div><span id="docs-internal-guid-8bafa750-7fff-d6bb-1ce6-e5f67d27f66a"><div style="margin-left:0pt;" align="left"><table style="border:none;border-collapse:collapse;"><colgroup><col><col><col><col><col></colgroup><tbody><tr style="height:37.75pt;"><td style="border-width: 0.75pt 0.75pt 1.5pt; border-style: solid; border-color: rgb(223, 223, 223) rgb(223, 223, 223) rgb(222, 226, 230); vertical-align: bottom; padding: 5pt; overflow: hidden; overflow-wrap: break-word;"><p style="line-height:1.38;text-align: center;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-weight: 700; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Domain</span></p></td><td colspan="2" style="border-width: 0.75pt 0.75pt 1.5pt; border-style: solid; border-color: rgb(223, 223, 223) rgb(223, 223, 223) rgb(222, 226, 230); vertical-align: bottom; padding: 5pt; overflow: hidden; overflow-wrap: break-word;"><p style="line-height:1.38;text-align: center;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-weight: 700; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">ID</span></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dee2e6 1.5pt;border-top:solid #dfdfdf 0.75pt;vertical-align:bottom;padding:5pt 5pt 5pt 5pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;text-align: center;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-weight: 700; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Name</span></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dee2e6 1.5pt;border-top:solid #dfdfdf 0.75pt;vertical-align:bottom;padding:5pt 5pt 5pt 5pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;text-align: center;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-weight: 700; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Use</span></p></td></tr><tr style="height:30pt;"><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dee2e6 1.5pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Enterprise</span></p></td><td colspan="2" style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dee2e6 1.5pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1110"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">T1110</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dee2e6 1.5pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1110"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Brute Force</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dee2e6 1.5pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/software/S0220"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Chaos</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;"> conducts brute force attacks against SSH services to gain initial access.</span><a href="http://gosecure.net/2018/02/14/chaos-stolen-backdoor-rising/"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">[1]</span></a></p></td></tr><tr style="height:42.75pt;"><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Enterprise</span></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1059"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">T1059</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1059/004"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">.004</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1059"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Command and Scripting Interpreter</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">: </span><a href="https://attack.mitre.org/techniques/T1059/004"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Unix Shell</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/software/S0220"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Chaos</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;"> provides a reverse shell connection on 8338/TCP, encrypted via AES.</span><a href="http://gosecure.net/2018/02/14/chaos-stolen-backdoor-rising/"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">[1]</span></a></p></td></tr></tbody></table><span id="docs-internal-guid-4be897d4-7fff-36a7-d614-f7a11fc63648"><div style="margin-left:0pt;" align="left"><table style="border:none;border-collapse:collapse;"><colgroup><col><col><col><col><col></colgroup><tbody><tr style="height:42.75pt;"><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Enterprise</span></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1573"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">T1573</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1573/001"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">.001</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1573"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Encrypted Channel</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">: </span><a href="https://attack.mitre.org/techniques/T1573/001"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Symmetric Cryptography</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/software/S0220"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Chaos</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;"> provides a reverse shell connection on 8338/TCP, encrypted via AES.</span><a href="http://gosecure.net/2018/02/14/chaos-stolen-backdoor-rising/"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">[1]</span></a></p></td></tr><tr style="height:42.75pt;"><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Enterprise</span></p></td><td colspan="2" style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1104"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">T1104</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1104"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Multi-Stage Channels</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">After initial compromise, </span><a href="https://attack.mitre.org/software/S0220"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Chaos</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;"> will download a second stage to establish a more permanent presence on the affected system.</span><a href="http://gosecure.net/2018/02/14/chaos-stolen-backdoor-rising/"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">[1]</span></a></p></td></tr><tr style="height:29.25pt;"><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Enterprise</span></p></td><td colspan="2" style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1205"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">T1205</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/techniques/T1205"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Traffic Signaling</span></a></p></td><td style="border-left:solid #dfdfdf 0.75pt;border-right:solid #dfdfdf 0.75pt;border-bottom:solid #dfdfdf 0.75pt;border-top:solid #dfdfdf 0.75pt;vertical-align:top;padding:8pt 8pt 8pt 8pt;overflow:hidden;overflow-wrap:break-word;"><p style="line-height:1.38;margin-top:0pt;margin-bottom:0pt;"><a href="https://attack.mitre.org/software/S0220"><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">Chaos</span></a><span style="font-size: 12pt; font-family: Arial, sans-serif; color: rgb(33, 37, 41); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;"> provides a reverse shell is triggered upon receipt of a packet with a special string, sent to any port.</span><a href="http://gosecure.net/2018/02/14/chaos-stolen-backdoor-rising/"><span style="font-size: 9pt; font-family: Arial, sans-serif; color: rgb(79, 124, 172); background-color: transparent; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; vertical-align: baseline;">[1]</span></a></p></td></tr></tbody></table></div></span></div></span></div><div><b><br></b></div><div><b><br></b></div><div><br></div><div><br></div>