rule win_tflower_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.tflower."
        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.tflower"
        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 = { ff15???????? 85db 7423 895e04 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   85db                 | test                ebx, ebx
            //   7423                 | je                  0x25
            //   895e04               | mov                 dword ptr [esi + 4], ebx

        $sequence_1 = { 8bde ff36 8d85e8fdfdff c7460400000000 68???????? }
            // n = 5, score = 200
            //   8bde                 | mov                 ebx, esi
            //   ff36                 | push                dword ptr [esi]
            //   8d85e8fdfdff         | lea                 eax, [ebp - 0x20218]
            //   c7460400000000       | mov                 dword ptr [esi + 4], 0
            //   68????????           |                     

        $sequence_2 = { 0001 0200 0103 0303 }
            // n = 4, score = 200
            //   0001                 | add                 byte ptr [ecx], al
            //   0200                 | add                 al, byte ptr [eax]
            //   0103                 | add                 dword ptr [ebx], eax
            //   0303                 | add                 eax, dword ptr [ebx]

        $sequence_3 = { 8bba446f4f00 c1e104 33b1416f4f00 33b9456f4f00 0fb6cc 8b842494000000 }
            // n = 6, score = 200
            //   8bba446f4f00         | mov                 edi, dword ptr [edx + 0x4f6f44]
            //   c1e104               | shl                 ecx, 4
            //   33b1416f4f00         | xor                 esi, dword ptr [ecx + 0x4f6f41]
            //   33b9456f4f00         | xor                 edi, dword ptr [ecx + 0x4f6f45]
            //   0fb6cc               | movzx               ecx, ah
            //   8b842494000000       | mov                 eax, dword ptr [esp + 0x94]

        $sequence_4 = { 0fb60c85167c4b00 0fb63485177c4b00 8bf9 8985b4f8ffff c1e702 57 }
            // n = 6, score = 200
            //   0fb60c85167c4b00     | movzx               ecx, byte ptr [eax*4 + 0x4b7c16]
            //   0fb63485177c4b00     | movzx               esi, byte ptr [eax*4 + 0x4b7c17]
            //   8bf9                 | mov                 edi, ecx
            //   8985b4f8ffff         | mov                 dword ptr [ebp - 0x74c], eax
            //   c1e702               | shl                 edi, 2
            //   57                   | push                edi

        $sequence_5 = { 0008 7408 0002 7408 }
            // n = 4, score = 200
            //   0008                 | add                 byte ptr [eax], cl
            //   7408                 | je                  0xa
            //   0002                 | add                 byte ptr [edx], al
            //   7408                 | je                  0xa

        $sequence_6 = { 0001 7708 00f3 7608 }
            // n = 4, score = 200
            //   0001                 | add                 byte ptr [ecx], al
            //   7708                 | ja                  0xa
            //   00f3                 | add                 bl, dh
            //   7608                 | jbe                 0xa

        $sequence_7 = { 000f 7708 0001 7708 }
            // n = 4, score = 200
            //   000f                 | add                 byte ptr [edi], cl
            //   7708                 | ja                  0xa
            //   0001                 | add                 byte ptr [ecx], al
            //   7708                 | ja                  0xa

        $sequence_8 = { 6a2f 68???????? 56 e8???????? 83c40c 5e }
            // n = 6, score = 200
            //   6a2f                 | push                0x2f
            //   68????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   5e                   | pop                 esi

        $sequence_9 = { 0010 740b 0021 740b }
            // n = 4, score = 200
            //   0010                 | add                 byte ptr [eax], dl
            //   740b                 | je                  0xd
            //   0021                 | add                 byte ptr [ecx], ah
            //   740b                 | je                  0xd

        $sequence_10 = { 001a 0c05 003c0c 05004e0c05 }
            // n = 4, score = 200
            //   001a                 | add                 byte ptr [edx], bl
            //   0c05                 | or                  al, 5
            //   003c0c               | add                 byte ptr [esp + ecx], bh
            //   05004e0c05           | add                 eax, 0x50c4e00

        $sequence_11 = { 330cb5189c4e00 8b5734 33e9 8b7730 33d5 c1ca04 }
            // n = 6, score = 200
            //   330cb5189c4e00       | xor                 ecx, dword ptr [esi*4 + 0x4e9c18]
            //   8b5734               | mov                 edx, dword ptr [edi + 0x34]
            //   33e9                 | xor                 ebp, ecx
            //   8b7730               | mov                 esi, dword ptr [edi + 0x30]
            //   33d5                 | xor                 edx, ebp
            //   c1ca04               | ror                 edx, 4

        $sequence_12 = { 000b 8605???????? 007885 0500788605 }
            // n = 4, score = 200
            //   000b                 | add                 byte ptr [ebx], cl
            //   8605????????         |                     
            //   007885               | add                 byte ptr [eax - 0x7b], bh
            //   0500788605           | add                 eax, 0x5867800

        $sequence_13 = { 0002 7408 00f7 7308 }
            // n = 4, score = 200
            //   0002                 | add                 byte ptr [edx], al
            //   7408                 | je                  0xa
            //   00f7                 | add                 bh, dh
            //   7308                 | jae                 0xa

        $sequence_14 = { 83e03f 330c8518964e00 330c95189d4e00 8b5764 }
            // n = 4, score = 200
            //   83e03f               | and                 eax, 0x3f
            //   330c8518964e00       | xor                 ecx, dword ptr [eax*4 + 0x4e9618]
            //   330c95189d4e00       | xor                 ecx, dword ptr [edx*4 + 0x4e9d18]
            //   8b5764               | mov                 edx, dword ptr [edi + 0x64]

        $sequence_15 = { 8bc2 c1e818 894efe 0fb60c8520dd4e00 }
            // n = 4, score = 200
            //   8bc2                 | mov                 eax, edx
            //   c1e818               | shr                 eax, 0x18
            //   894efe               | mov                 dword ptr [esi - 2], ecx
            //   0fb60c8520dd4e00     | movzx               ecx, byte ptr [eax*4 + 0x4edd20]

    condition:
        7 of them and filesize < 6578176
}