Investigation of Linux.Mirai Trojan family

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© Doctor Web, 2016. All rights reserved. This document is the property of Doctor Web. No part of this document may be reproduced, published or transmitted in any form or by any means for any purpose other than the purchaser's personal use without proper attribution. Doctor Web develops and distributes Dr.Web information security solutions which provide efficient protection from malicious software and spam. Doctor Web customers can be found among home users from all over the world and in government enterprises, small companies and nationwide corporations. Dr.Web antivirus solutions are well known since 1992 for continuing excellence in malware detection and compliance with international information security standards. State certificates and awards received by the Dr.Web solutions, as well as the globally widespread use of our products are the best evidence of exceptional trust to the company products. Investigation of Linux.Mirai Trojan family 9/30/2016 Doctor Web Head Office 2-12A, 3rd str. Yamskogo polya Moscow, Russia 125124 Website: www.drweb.com Phone: +7 (495) 789-45-87 Refer to the official web site for regional and international office information.
3 3 Introduction A Trojan for Linux that was named Linux.Mirai has several predecessors. The first malware program belonging to this family was spotted in May 2016 and was dubbed Linux.DDoS.87. At the beginning of August, a new version of this Trojan—Linux.DDoS.89—was discovered. Finally, Doctor Web’s security researchers investigated the Linux.Mirai Trojan found later that month. To learn more on each Trojan, click the corresponding link below: Description of Linux.DDoS.87 Description of Linux.DDoS.89 Description of Linux.Mirai
Page 1: Investigation of Linux.Mirai Trojan
Page 5 and 6: 5 5 v1[1] = XX; v1[2] = XX; v1[3] =
Page 7 and 8: 7 7 Number Data type Value Purpose
Page 9 and 10: 9 9 .text:08048206 mov ds:Q[ecx*4],
Page 11 and 12: 11 11 .text:0804B03C mov dword ptr
Page 13 and 14: 13 13 .text:0804B1FB push 0 ; flags
Page 15 and 16: 15 15 .text:0804B3C1 call ___libc_w
Page 17 and 18: 17 17 .text:0804B4A4 push eax ; int
Page 19 and 20: 19 19 .text:0804B674 push offset a2
Page 21 and 22: 21 21 .text:0804B529 push 4000h ; i
Page 23 and 24: 23 23 } char * data; Code to initia
Page 25 and 26: 25 25 .text:0804BB16 test bl, bl .t
Page 27 and 28: 27 27 setsid(); sleep(time); kill(v
Page 29 and 30: 29 29 The getNumberOrDefault functi
Page 31 and 32: 31 31 v9 = __ROR2__(sport, 8); curr
Page 33 and 34: 33 33 .text:0804AD5E add esp, 18h .
Page 35 and 36: 35 35 .text:0804A50F xor ecx, ecx .
Page 37 and 38: 37 37 In addition, TCP parameters w
Page 39 and 40: 39 39 .text:08048F6D mov eax, [esp+
Page 41 and 42: 41 41 Linux.DDoS.89 SHA1: 846b2d1b0
Page 43 and 44: 43 43 } } else { v8 = 0; while ( ++
Page 45 and 46: 45 45 { } decode(4u); decode(5u); c
Page 47 and 48: 47 47 } else { result = __GI_listen
Page 49 and 50: 49 49 Number Decrypted value Purpos
Page 51 and 52: 51 51 .text:0804C218 push 9 ; sig .
Page 53 and 54:
53 53 Number Value Purpose 16 "zoll
Page 55 and 56:
55 55 Next, the Trojan calculates a
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Investigation of Linux.Mirai Trojan family

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