SYMBOLCOMMON_NAMEaka. SYNONYMS
win.rovnix (Back to overview)

Rovnix

aka: Mayachok, Cidox, BkLoader

Rovnix is a bootkit and consists of a driver loader (in the VBR) and the drivers (32bit, 64bit) themselves. It is part of the Carberp source code leak (https://github.com/nyx0/Rovnix). Rovnix has been used to protect Gozi ISFB, ReactorBot and Rerdom (at least).

References
2020-06-23Kaspersky LabsAlexander Eremin
@online{eremin:20200623:oh:4e55504, author = {Alexander Eremin}, title = {{Oh, what a boot-iful mornin’ Rovnix bootkit back in business}}, date = {2020-06-23}, organization = {Kaspersky Labs}, url = {https://securelist.com/oh-what-a-boot-iful-mornin/97365}, language = {English}, urldate = {2020-06-23} } Oh, what a boot-iful mornin’ Rovnix bootkit back in business
Rovnix
2015-05-15Malware DiggerHanan Natan
@online{natan:20150515:rovnix:870b5a4, author = {Hanan Natan}, title = {{Rovnix Dropper Analysis (TrojanDropper:Win32/Rovnix.P)}}, date = {2015-05-15}, organization = {Malware Digger}, url = {http://www.malwaredigger.com/2015/05/rovnix-dropper-analysis.html}, language = {English}, urldate = {2019-11-05} } Rovnix Dropper Analysis (TrojanDropper:Win32/Rovnix.P)
ReactorBot Rovnix
2014-09Virus BulletinEugene Rodionov, Alexander Matrosov, David Harley
@techreport{rodionov:201409:bootkits:d55d6a7, author = {Eugene Rodionov and Alexander Matrosov and David Harley}, title = {{BOOTKITS: PAST, PRESENT & FUTURE}}, date = {2014-09}, institution = {Virus Bulletin}, url = {https://www.virusbulletin.com/uploads/pdf/conference/vb2014/VB2014-RodionovMatrosov.pdf}, language = {English}, urldate = {2020-01-08} } BOOTKITS: PAST, PRESENT & FUTURE
Rovnix
2014-05-06MalwareTechMalwareTech
@online{malwaretech:20140506:rovnix:737e795, author = {MalwareTech}, title = {{Rovnix new “evolution”}}, date = {2014-05-06}, organization = {MalwareTech}, url = {http://www.malwaretech.com/2014/05/rovnix-new-evolution.html}, language = {English}, urldate = {2020-01-08} } Rovnix new “evolution”
Rovnix
2012-07-13ESET ResearchAleksandr Matrosov
@online{matrosov:20120713:rovnix:7988101, author = {Aleksandr Matrosov}, title = {{Rovnix bootkit framework updated}}, date = {2012-07-13}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2012/07/13/rovnix-bootkit-framework-updated/}, language = {English}, urldate = {2019-11-14} } Rovnix bootkit framework updated
Rovnix
2011-07-08Dr.WebDr. Web
@online{web:20110708:trojanmayachok2:5c42099, author = {Dr. Web}, title = {{Trojan.Mayachok.2: анализ первого известного VBR-буткита}}, date = {2011-07-08}, organization = {Dr.Web}, url = {https://news.drweb.ru/?i=1772&c=23&lng=ru&p=0}, language = {Russian}, urldate = {2020-01-06} } Trojan.Mayachok.2: анализ первого известного VBR-буткита
Rovnix
2011-07-06Kaspersky LabsVyacheslav Zakorzhevsky
@online{zakorzhevsky:20110706:cybercriminals:78ad047, author = {Vyacheslav Zakorzhevsky}, title = {{Cybercriminals switch from MBR to NTFS}}, date = {2011-07-06}, organization = {Kaspersky Labs}, url = {https://securelist.com/cybercriminals-switch-from-mbr-to-ntfs-2/29117/}, language = {English}, urldate = {2019-12-20} } Cybercriminals switch from MBR to NTFS
Rovnix
2011-07-04Kernelmode.info Forumsrkhunter
@online{rkhunter:20110704:winntrovnix:8a594f6, author = {rkhunter}, title = {{WinNT/Rovnix (alias Mayachok, Cidox, BkLoader)}}, date = {2011-07-04}, organization = {Kernelmode.info Forums}, url = {http://www.kernelmode.info/forum/viewtopic.php?f=16&t=981}, language = {English}, urldate = {2019-07-11} } WinNT/Rovnix (alias Mayachok, Cidox, BkLoader)
Rovnix
Yara Rules
[TLP:WHITE] win_rovnix_auto (20200529 | autogenerated rule brought to you by yara-signator)
rule win_rovnix_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rovnix"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using yara-signator.
     * The code and documentation / approach is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 83e7f0 89542418 83c710 8bea }
            // n = 4, score = 900
            //   83e7f0               | and                 edi, 0xfffffff0
            //   89542418             | mov                 dword ptr [esp + 0x18], edx
            //   83c710               | add                 edi, 0x10
            //   8bea                 | mov                 ebp, edx

        $sequence_1 = { be???????? 8b15???????? 83e7f0 89542418 }
            // n = 4, score = 900
            //   be????????           |                     
            //   8b15????????         |                     
            //   83e7f0               | and                 edi, 0xfffffff0
            //   89542418             | mov                 dword ptr [esp + 0x18], edx

        $sequence_2 = { ad 2bc3 ab e2fa 61 }
            // n = 5, score = 900
            //   ad                   | lodsd               eax, dword ptr [esi]
            //   2bc3                 | sub                 eax, ebx
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   e2fa                 | loop                0xfffffffc
            //   61                   | popal               

        $sequence_3 = { 8bf8 83c335 c1e902 ad }
            // n = 4, score = 900
            //   8bf8                 | mov                 edi, eax
            //   83c335               | add                 ebx, 0x35
            //   c1e902               | shr                 ecx, 2
            //   ad                   | lodsd               eax, dword ptr [esi]

        $sequence_4 = { 837c242c00 7405 57 6a00 ffd2 89442408 8bcf }
            // n = 7, score = 900
            //   837c242c00           | cmp                 dword ptr [esp + 0x2c], 0
            //   7405                 | je                  7
            //   57                   | push                edi
            //   6a00                 | push                0
            //   ffd2                 | call                edx
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   8bcf                 | mov                 ecx, edi

        $sequence_5 = { 60 bf40090000 be???????? 8b15???????? }
            // n = 4, score = 500
            //   60                   | pushal              
            //   bf40090000           | mov                 edi, 0x940
            //   be????????           |                     
            //   8b15????????         |                     

        $sequence_6 = { 6a01 6a01 ff15???????? 5f }
            // n = 4, score = 400
            //   6a01                 | push                1
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   5f                   | pop                 edi

        $sequence_7 = { 7408 8b5e14 8b7e10 eb06 8b5d0c 8b7d08 }
            // n = 6, score = 400
            //   7408                 | je                  0xa
            //   8b5e14               | mov                 ebx, dword ptr [esi + 0x14]
            //   8b7e10               | mov                 edi, dword ptr [esi + 0x10]
            //   eb06                 | jmp                 8
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_8 = { 6a00 6824080000 6a00 bf9a0000c0 ff15???????? }
            // n = 5, score = 400
            //   6a00                 | push                0
            //   6824080000           | push                0x824
            //   6a00                 | push                0
            //   bf9a0000c0           | mov                 edi, 0xc000009a
            //   ff15????????         |                     

        $sequence_9 = { 85c0 e8???????? 8be5 5d }
            // n = 4, score = 400
            //   85c0                 | test                eax, eax
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_10 = { 8975e4 c745ec40020000 8975e8 8975f0 }
            // n = 4, score = 400
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi
            //   c745ec40020000       | mov                 dword ptr [ebp - 0x14], 0x240
            //   8975e8               | mov                 dword ptr [ebp - 0x18], esi
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi

        $sequence_11 = { 8d4abf 83f919 7703 83c220 85c0 7404 3bc2 }
            // n = 7, score = 400
            //   8d4abf               | lea                 ecx, [edx - 0x41]
            //   83f919               | cmp                 ecx, 0x19
            //   7703                 | ja                  5
            //   83c220               | add                 edx, 0x20
            //   85c0                 | test                eax, eax
            //   7404                 | je                  6
            //   3bc2                 | cmp                 eax, edx

        $sequence_12 = { 6a30 6a00 ff15???????? 8bf0 }
            // n = 4, score = 400
            //   6a30                 | push                0x30
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_13 = { 8b4510 85c0 7405 83c61c 8930 }
            // n = 5, score = 400
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7
            //   83c61c               | add                 esi, 0x1c
            //   8930                 | mov                 dword ptr [eax], esi

        $sequence_14 = { c745d800020000 8975d4 8975dc 8975e0 ff15???????? }
            // n = 5, score = 400
            //   c745d800020000       | mov                 dword ptr [ebp - 0x28], 0x200
            //   8975d4               | mov                 dword ptr [ebp - 0x2c], esi
            //   8975dc               | mov                 dword ptr [ebp - 0x24], esi
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   ff15????????         |                     

        $sequence_15 = { 8936 8d7e08 897f04 893f 894e14 895e10 8b4314 }
            // n = 7, score = 400
            //   8936                 | mov                 dword ptr [esi], esi
            //   8d7e08               | lea                 edi, [esi + 8]
            //   897f04               | mov                 dword ptr [edi + 4], edi
            //   893f                 | mov                 dword ptr [edi], edi
            //   894e14               | mov                 dword ptr [esi + 0x14], ecx
            //   895e10               | mov                 dword ptr [esi + 0x10], ebx
            //   8b4314               | mov                 eax, dword ptr [ebx + 0x14]

        $sequence_16 = { 5d c3 85c0 e8???????? }
            // n = 4, score = 200
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   85c0                 | test                eax, eax
            //   e8????????           |                     

        $sequence_17 = { 8be5 5d c3 85c9 e8???????? }
            // n = 5, score = 200
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   85c9                 | test                ecx, ecx
            //   e8????????           |                     

        $sequence_18 = { 55 8bec 85db 85c9 }
            // n = 4, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   85db                 | test                ebx, ebx
            //   85c9                 | test                ecx, ecx

        $sequence_19 = { 23db 81e1ff000000 23c9 83440c0404 }
            // n = 4, score = 200
            //   23db                 | and                 ebx, ebx
            //   81e1ff000000         | and                 ecx, 0xff
            //   23c9                 | and                 ecx, ecx
            //   83440c0404           | add                 dword ptr [esp + ecx + 4], 4

        $sequence_20 = { 23c9 16 85c9 23d2 59 }
            // n = 5, score = 200
            //   23c9                 | and                 ecx, ecx
            //   16                   | push                ss
            //   85c9                 | test                ecx, ecx
            //   23d2                 | and                 edx, edx
            //   59                   | pop                 ecx

        $sequence_21 = { 83440c0404 23c9 8be5 5d c20400 95 }
            // n = 6, score = 100
            //   83440c0404           | add                 dword ptr [esp + ecx + 4], 4
            //   23c9                 | and                 ecx, ecx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   95                   | xchg                eax, ebp

        $sequence_22 = { 12da 2c4d 0a0d???????? 46 90 06 57 }
            // n = 7, score = 100
            //   12da                 | adc                 bl, dl
            //   2c4d                 | sub                 al, 0x4d
            //   0a0d????????         |                     
            //   46                   | inc                 esi
            //   90                   | nop                 
            //   06                   | push                es
            //   57                   | push                edi

        $sequence_23 = { 75f9 2bc7 54 52 a2???????? }
            // n = 5, score = 100
            //   75f9                 | jne                 0xfffffffb
            //   2bc7                 | sub                 eax, edi
            //   54                   | push                esp
            //   52                   | push                edx
            //   a2????????           |                     

        $sequence_24 = { 488d8108010000 483bd0 0f82b5000000 488d1c29 813b50450000 }
            // n = 5, score = 100
            //   488d8108010000       | dec                 eax
            //   483bd0               | add                 esp, 0x40
            //   0f82b5000000         | dec                 eax
            //   488d1c29             | add                 esi, ebp
            //   813b50450000         | inc                 ecx

        $sequence_25 = { 5b 1041cf 5f a3???????? fa 3e9b }
            // n = 6, score = 100
            //   5b                   | pop                 ebx
            //   1041cf               | adc                 byte ptr [ecx - 0x31], al
            //   5f                   | pop                 edi
            //   a3????????           |                     
            //   fa                   | cli                 
            //   3e9b                 | wait                

        $sequence_26 = { f6431004 0f8488000000 8b5308 4533c0 418d4801 ff15???????? }
            // n = 6, score = 100
            //   f6431004             | test                byte ptr [ebx + 0x10], 4
            //   0f8488000000         | je                  0x8e
            //   8b5308               | mov                 edx, dword ptr [ebx + 8]
            //   4533c0               | inc                 ebp
            //   418d4801             | xor                 eax, eax
            //   ff15????????         |                     

        $sequence_27 = { 6232 ce c234a7 204175 }
            // n = 4, score = 100
            //   6232                 | bound               esi, qword ptr [edx]
            //   ce                   | into                
            //   c234a7               | ret                 0xa734
            //   204175               | and                 byte ptr [ecx + 0x75], al

        $sequence_28 = { 85db 8b4d08 85db 85c9 }
            // n = 4, score = 100
            //   85db                 | test                ebx, ebx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   85db                 | test                ebx, ebx
            //   85c9                 | test                ecx, ecx

        $sequence_29 = { 4803cd e8???????? 85c0 7411 ffc3 4883c704 4883c602 }
            // n = 7, score = 100
            //   4803cd               | inc                 eax
            //   e8????????           |                     
            //   85c0                 | dec                 ecx
            //   7411                 | add                 edx, 0x20
            //   ffc3                 | inc                 esp
            //   4883c704             | cmp                 eax, edx
            //   4883c602             | jb                  0xffffff94

        $sequence_30 = { 48c744245000900100 e8???????? 488b4c2458 8bd8 e8???????? 8bc3 4883c440 }
            // n = 7, score = 100
            //   48c744245000900100     | dec    ebp
            //   e8????????           |                     
            //   488b4c2458           | lea                 ecx, [ecx + 1]
            //   8bd8                 | inc                 esp
            //   e8????????           |                     
            //   8bc3                 | lea                 eax, [eax - 0x41]
            //   4883c440             | inc                 ecx

        $sequence_31 = { 4803f5 41ffc0 4983c220 443bc2 7288 41f6c402 7543 }
            // n = 7, score = 100
            //   4803f5               | cmp                 eax, 0x19
            //   41ffc0               | dec                 eax
            //   4983c220             | mov                 dword ptr [esp + 0x50], 0x19000
            //   443bc2               | dec                 eax
            //   7288                 | mov                 ecx, dword ptr [esp + 0x58]
            //   41f6c402             | mov                 ebx, eax
            //   7543                 | mov                 eax, ebx

        $sequence_32 = { 488bfe f2ae 48f7d1 48ffc9 488bf9 }
            // n = 5, score = 100
            //   488bfe               | inc                 ecx
            //   f2ae                 | test                ah, 2
            //   48f7d1               | jne                 0x55
            //   48ffc9               | dec                 eax
            //   488bf9               | lea                 eax, [ecx + 0x108]

        $sequence_33 = { 410fb601 4d8d4901 448d40bf 4183f819 }
            // n = 4, score = 100
            //   410fb601             | inc                 ecx
            //   4d8d4901             | lea                 ecx, [eax + 1]
            //   448d40bf             | inc                 ecx
            //   4183f819             | movzx               eax, byte ptr [ecx]

        $sequence_34 = { 4e 40 56 a1???????? }
            // n = 4, score = 100
            //   4e                   | dec                 esi
            //   40                   | inc                 eax
            //   56                   | push                esi
            //   a1????????           |                     

        $sequence_35 = { 83c710 8bea b85994e6cd 05???????? 05ccb00000 2d5994e5cd 837c242c00 }
            // n = 7, score = 100
            //   83c710               | add                 edi, 0x10
            //   8bea                 | mov                 ebp, edx
            //   b85994e6cd           | mov                 eax, 0xcde69459
            //   05????????           |                     
            //   05ccb00000           | add                 eax, 0xb0cc
            //   2d5994e5cd           | sub                 eax, 0xcde59459
            //   837c242c00           | cmp                 dword ptr [esp + 0x2c], 0

    condition:
        7 of them and filesize < 548864
}
Download all Yara Rules