rule win_feodo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.feodo."
        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.feodo"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 83fa09 7704 8bca eb10 8d519f 83fa05 7717 }
            // n = 7, score = 1100
            //   83fa09               | cmp                 edx, 9
            //   7704                 | ja                  6
            //   8bca                 | mov                 ecx, edx
            //   eb10                 | jmp                 0x12
            //   8d519f               | lea                 edx, [ecx - 0x61]
            //   83fa05               | cmp                 edx, 5
            //   7717                 | ja                  0x19

        $sequence_1 = { 6a00 6a02 6a04 68???????? }
            // n = 4, score = 1100
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   6a04                 | push                4
            //   68????????           |                     

        $sequence_2 = { 0fafc7 83c601 03c1 0fbe0e 85c9 }
            // n = 5, score = 1100
            //   0fafc7               | imul                eax, edi
            //   83c601               | add                 esi, 1
            //   03c1                 | add                 eax, ecx
            //   0fbe0e               | movsx               ecx, byte ptr [esi]
            //   85c9                 | test                ecx, ecx

        $sequence_3 = { ff15???????? 8bf0 85f6 7507 53 ff15???????? 81c3f4010000 }
            // n = 7, score = 1100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7507                 | jne                 9
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   81c3f4010000         | add                 ebx, 0x1f4

        $sequence_4 = { 52 6a00 50 ff15???????? 8b0c24 }
            // n = 5, score = 1100
            //   52                   | push                edx
            //   6a00                 | push                0
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b0c24               | mov                 ecx, dword ptr [esp]

        $sequence_5 = { 6a00 68???????? 56 ff15???????? f7d8 1bc0 f7d8 }
            // n = 7, score = 1100
            //   6a00                 | push                0
            //   68????????           |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax

        $sequence_6 = { 6a00 50 ff15???????? 8b0c24 51 ff15???????? }
            // n = 6, score = 1100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b0c24               | mov                 ecx, dword ptr [esp]
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_7 = { 6a06 6a01 6a02 ff15???????? 8bf0 83feff 741b }
            // n = 7, score = 1100
            //   6a06                 | push                6
            //   6a01                 | push                1
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83feff               | cmp                 esi, -1
            //   741b                 | je                  0x1d

        $sequence_8 = { 7436 3d00010000 752f be04000000 eb28 3d00030000 }
            // n = 6, score = 1100
            //   7436                 | je                  0x38
            //   3d00010000           | cmp                 eax, 0x100
            //   752f                 | jne                 0x31
            //   be04000000           | mov                 esi, 4
            //   eb28                 | jmp                 0x2a
            //   3d00030000           | cmp                 eax, 0x300

        $sequence_9 = { 83e800 7440 83e801 7422 83e801 7404 }
            // n = 6, score = 1100
            //   83e800               | sub                 eax, 0
            //   7440                 | je                  0x42
            //   83e801               | sub                 eax, 1
            //   7422                 | je                  0x24
            //   83e801               | sub                 eax, 1
            //   7404                 | je                  6

    condition:
        7 of them and filesize < 270336
}