rule win_btcware_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.btcware."
        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.btcware"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 16 97 88bd24f1ed24 ae }
            // n = 4, score = 100
            //   16                   | push                ss
            //   97                   | xchg                eax, edi
            //   88bd24f1ed24         | mov                 byte ptr [ebp + 0x24edf124], bh
            //   ae                   | scasb               al, byte ptr es:[edi]

        $sequence_1 = { 6bf830 8955f4 8b149540d04100 897df0 8a5c1729 80fb02 7405 }
            // n = 7, score = 100
            //   6bf830               | imul                edi, eax, 0x30
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   8b149540d04100       | mov                 edx, dword ptr [edx*4 + 0x41d040]
            //   897df0               | mov                 dword ptr [ebp - 0x10], edi
            //   8a5c1729             | mov                 bl, byte ptr [edi + edx + 0x29]
            //   80fb02               | cmp                 bl, 2
            //   7405                 | je                  7

        $sequence_2 = { ffd6 6a00 8d45d8 50 6a03 ff75ec }
            // n = 6, score = 100
            //   ffd6                 | call                esi
            //   6a00                 | push                0
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   50                   | push                eax
            //   6a03                 | push                3
            //   ff75ec               | push                dword ptr [ebp - 0x14]

        $sequence_3 = { 0f84b7010000 68???????? 8d85d0d7ffff 50 ffd6 85c0 0f84a1010000 }
            // n = 7, score = 100
            //   0f84b7010000         | je                  0x1bd
            //   68????????           |                     
            //   8d85d0d7ffff         | lea                 eax, [ebp - 0x2830]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   0f84a1010000         | je                  0x1a7

        $sequence_4 = { 0f82206fffff 83f923 0f87176fffff 8bc8 51 e8???????? }
            // n = 6, score = 100
            //   0f82206fffff         | jb                  0xffff6f26
            //   83f923               | cmp                 ecx, 0x23
            //   0f87176fffff         | ja                  0xffff6f1d
            //   8bc8                 | mov                 ecx, eax
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_5 = { 83f81d 7cf1 eb07 8b0cc5ec494100 894de4 }
            // n = 5, score = 100
            //   83f81d               | cmp                 eax, 0x1d
            //   7cf1                 | jl                  0xfffffff3
            //   eb07                 | jmp                 9
            //   8b0cc5ec494100       | mov                 ecx, dword ptr [eax*8 + 0x4149ec]
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx

        $sequence_6 = { 660f282d???????? 660f59f5 660f28aae03f4100 660f54e5 660f58fe 660f58fc }
            // n = 6, score = 100
            //   660f282d????????     |                     
            //   660f59f5             | mulpd               xmm6, xmm5
            //   660f28aae03f4100     | movapd              xmm5, xmmword ptr [edx + 0x413fe0]
            //   660f54e5             | andpd               xmm4, xmm5
            //   660f58fe             | addpd               xmm7, xmm6
            //   660f58fc             | addpd               xmm7, xmm4

        $sequence_7 = { c78530ffffff00000000 c78534ffffff0f000000 c68520ffffff00 83f810 7245 }
            // n = 5, score = 100
            //   c78530ffffff00000000     | mov    dword ptr [ebp - 0xd0], 0
            //   c78534ffffff0f000000     | mov    dword ptr [ebp - 0xcc], 0xf
            //   c68520ffffff00       | mov                 byte ptr [ebp - 0xe0], 0
            //   83f810               | cmp                 eax, 0x10
            //   7245                 | jb                  0x47

        $sequence_8 = { 8b45e0 8d4e0c 6a06 8d904cc54100 5f 668b02 8d5202 }
            // n = 7, score = 100
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8d4e0c               | lea                 ecx, [esi + 0xc]
            //   6a06                 | push                6
            //   8d904cc54100         | lea                 edx, [eax + 0x41c54c]
            //   5f                   | pop                 edi
            //   668b02               | mov                 ax, word ptr [edx]
            //   8d5202               | lea                 edx, [edx + 2]

        $sequence_9 = { e8???????? 8bf8 bad4fc8101 c645fc04 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   bad4fc8101           | mov                 edx, 0x181fcd4
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4

    condition:
        7 of them and filesize < 458752
}