rule win_tinba_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.tinba"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 = { 8b7508 ad 50 56 }
            // n = 4, score = 1100
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   ad                   | lodsd               eax, dword ptr [esi]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_1 = { 8b4510 aa 8b450c ab }
            // n = 4, score = 1100
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_2 = { 6a00 ff750c 6a00 6a00 ff7508 }
            // n = 5, score = 1000
            //   6a00                 | push                0
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_3 = { 8a241f 88240f 88041f 41 }
            // n = 4, score = 1000
            //   8a241f               | mov                 ah, byte ptr [edi + ebx]
            //   88240f               | mov                 byte ptr [edi + ecx], ah
            //   88041f               | mov                 byte ptr [edi + ebx], al
            //   41                   | inc                 ecx

        $sequence_4 = { 85c0 741b 66b80d0a 66ab }
            // n = 4, score = 900
            //   85c0                 | test                eax, eax
            //   741b                 | je                  0x1d
            //   66b80d0a             | mov                 ax, 0xa0d
            //   66ab                 | stosw               word ptr es:[edi], ax

        $sequence_5 = { 6a01 56 52 ff7510 }
            // n = 4, score = 900
            //   6a01                 | push                1
            //   56                   | push                esi
            //   52                   | push                edx
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_6 = { f3a4 b868747470 ab 8b4d08 8b4114 83f8fd }
            // n = 6, score = 900
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   b868747470           | mov                 eax, 0x70747468
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b4114               | mov                 eax, dword ptr [ecx + 0x14]
            //   83f8fd               | cmp                 eax, -3

        $sequence_7 = { 48 8d7a2b f6c308 7442 8a4218 24f8 }
            // n = 6, score = 900
            //   48                   | dec                 eax
            //   8d7a2b               | lea                 edi, [edx + 0x2b]
            //   f6c308               | test                bl, 8
            //   7442                 | je                  0x44
            //   8a4218               | mov                 al, byte ptr [edx + 0x18]
            //   24f8                 | and                 al, 0xf8

        $sequence_8 = { 7403 80e3f5 80f902 7414 80f901 7415 }
            // n = 6, score = 900
            //   7403                 | je                  5
            //   80e3f5               | and                 bl, 0xf5
            //   80f902               | cmp                 cl, 2
            //   7414                 | je                  0x16
            //   80f901               | cmp                 cl, 1
            //   7415                 | je                  0x17

        $sequence_9 = { 807a0801 740e f6420108 7408 834a3540 66a5 eb08 }
            // n = 7, score = 900
            //   807a0801             | cmp                 byte ptr [edx + 8], 1
            //   740e                 | je                  0x10
            //   f6420108             | test                byte ptr [edx + 1], 8
            //   7408                 | je                  0xa
            //   834a3540             | or                  dword ptr [edx + 0x35], 0x40
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   eb08                 | jmp                 0xa

        $sequence_10 = { 834a3508 a5 e9???????? 834a3510 48 a5 }
            // n = 6, score = 900
            //   834a3508             | or                  dword ptr [edx + 0x35], 8
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   e9????????           |                     
            //   834a3510             | or                  dword ptr [edx + 0x35], 0x10
            //   48                   | dec                 eax
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]

        $sequence_11 = { 8b4d10 51 57 ff750c }
            // n = 4, score = 900
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx
            //   57                   | push                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_12 = { c14d0804 3b7d0c 73e6 fc }
            // n = 4, score = 900
            //   c14d0804             | ror                 dword ptr [ebp + 8], 4
            //   3b7d0c               | cmp                 edi, dword ptr [ebp + 0xc]
            //   73e6                 | jae                 0xffffffe8
            //   fc                   | cld                 

    condition:
        7 of them and filesize < 57344
}

rule win_tinba_w0 
{
    meta:
        author = "n3sfox <n3sfox@gmail.com>"
        date = "2015/11/07"
        description = "Tinba 2 (DGA) banking trojan"
        reference = "https://securityintelligence.com/tinba-malware-reloaded-and-attacking-banks-around-the-world"
        filetype = "memory"
        hash1 = "c7f662594f07776ab047b322150f6ed0"
        hash2 = "dc71ef1e55f1ddb36b3c41b1b95ae586"
        hash3 = "b788155cb82a7600f2ed1965cffc1e88"
        source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/tinba2.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.tinba"
        malpedia_version = "20170605"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $str3 = "NtCreateUserProcess"
        $str4 = "NtQueryDirectoryFile"
        $str5 = "RtlCreateUserThread"
        $str6 = "DeleteUrlCacheEntry"
        $str7 = "PR_Read"
        $str8 = "PR_Write"
        $pubkey = "BEGIN PUBLIC KEY"
        $code1 = {50 87 44 24 04 6A ?? E8}

    condition:
        all of ($str*) and $pubkey and $code1
}