rule win_tinba_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.tinba."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.tinba"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 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 6a00 6a00 ff750c 6a00 6a00 ff7508 }
            // n = 7, score = 1000
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   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 = { b3fd eb73 b3fe b738 887a19 80fd02 }
            // n = 6, score = 900
            //   b3fd                 | mov                 bl, 0xfd
            //   eb73                 | jmp                 0x75
            //   b3fe                 | mov                 bl, 0xfe
            //   b738                 | mov                 bh, 0x38
            //   887a19               | mov                 byte ptr [edx + 0x19], bh
            //   80fd02               | cmp                 ch, 2

        $sequence_5 = { 83c707 8b4508 83e00f 3c0a 7304 0430 eb02 }
            // n = 7, score = 900
            //   83c707               | add                 edi, 7
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83e00f               | and                 eax, 0xf
            //   3c0a                 | cmp                 al, 0xa
            //   7304                 | jae                 6
            //   0430                 | add                 al, 0x30
            //   eb02                 | jmp                 4

        $sequence_6 = { 8b7004 8d7e04 8b0e 3b4d10 7603 8b4d10 51 }
            // n = 7, score = 900
            //   8b7004               | mov                 esi, dword ptr [eax + 4]
            //   8d7e04               | lea                 edi, [esi + 4]
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   3b4d10               | cmp                 ecx, dword ptr [ebp + 0x10]
            //   7603                 | jbe                 5
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx

        $sequence_7 = { 0430 eb02 0437 aa }
            // n = 4, score = 900
            //   0430                 | add                 al, 0x30
            //   eb02                 | jmp                 4
            //   0437                 | add                 al, 0x37
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_8 = { 85c0 741b 66b80d0a 66ab b855736572 ab }
            // n = 6, score = 900
            //   85c0                 | test                eax, eax
            //   741b                 | je                  0x1d
            //   66b80d0a             | mov                 ax, 0xa0d
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   b855736572           | mov                 eax, 0x72657355
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_9 = { 740f 80e7fe b918000000 48 8d3d83010000 383f 48 }
            // n = 7, score = 900
            //   740f                 | je                  0x11
            //   80e7fe               | and                 bh, 0xfe
            //   b918000000           | mov                 ecx, 0x18
            //   48                   | dec                 eax
            //   8d3d83010000         | lea                 edi, [0x183]
            //   383f                 | cmp                 byte ptr [edi], bh
            //   48                   | dec                 eax

        $sequence_10 = { f6d0 f6d4 f6d1 6689420f }
            // n = 4, score = 900
            //   f6d0                 | not                 al
            //   f6d4                 | not                 ah
            //   f6d1                 | not                 cl
            //   6689420f             | mov                 word ptr [edx + 0xf], ax

        $sequence_11 = { 48 83ec20 4c 89f1 48 c7c240000000 4c }
            // n = 7, score = 900
            //   48                   | dec                 eax
            //   83ec20               | sub                 esp, 0x20
            //   4c                   | dec                 esp
            //   89f1                 | mov                 ecx, esi
            //   48                   | dec                 eax
            //   c7c240000000         | mov                 edx, 0x40
            //   4c                   | dec                 esp

        $sequence_12 = { 8b4d08 8b4114 83f8fd 7506 }
            // n = 4, score = 900
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b4114               | mov                 eax, dword ptr [ecx + 0x14]
            //   83f8fd               | cmp                 eax, -3
            //   7506                 | jne                 8

    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"
        hash = "c7f662594f07776ab047b322150f6ed0"
        hash = "dc71ef1e55f1ddb36b3c41b1b95ae586"
        hash = "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
}