rule win_rumish_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.rumish."
        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.rumish"
        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 = { 83c101 894d90 8b5590 3b559c 0f8dcd000000 c7458c00000000 }
            // n = 6, score = 100
            //   83c101               | add                 ecx, 1
            //   894d90               | mov                 dword ptr [ebp - 0x70], ecx
            //   8b5590               | mov                 edx, dword ptr [ebp - 0x70]
            //   3b559c               | cmp                 edx, dword ptr [ebp - 0x64]
            //   0f8dcd000000         | jge                 0xd3
            //   c7458c00000000       | mov                 dword ptr [ebp - 0x74], 0

        $sequence_1 = { 8b4d0c 51 8b55fc 52 8b4df4 e8???????? e8???????? }
            // n = 7, score = 100
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   51                   | push                ecx
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   52                   | push                edx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_2 = { 33c5 8945e8 53 56 50 8d45f4 }
            // n = 6, score = 100
            //   33c5                 | xor                 eax, ebp
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   53                   | push                ebx
            //   56                   | push                esi
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]

        $sequence_3 = { 8b95a4feffff 83c201 8995a4feffff 8b85a4feffff 3b85acfeffff 0f8d90000000 8b8da4feffff }
            // n = 7, score = 100
            //   8b95a4feffff         | mov                 edx, dword ptr [ebp - 0x15c]
            //   83c201               | add                 edx, 1
            //   8995a4feffff         | mov                 dword ptr [ebp - 0x15c], edx
            //   8b85a4feffff         | mov                 eax, dword ptr [ebp - 0x15c]
            //   3b85acfeffff         | cmp                 eax, dword ptr [ebp - 0x154]
            //   0f8d90000000         | jge                 0x96
            //   8b8da4feffff         | mov                 ecx, dword ptr [ebp - 0x15c]

        $sequence_4 = { 52 8d8db4fdffff e8???????? 8b0e 2b08 898db4fcffff c785b8fcffff00000000 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   8d8db4fdffff         | lea                 ecx, [ebp - 0x24c]
            //   e8????????           |                     
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   2b08                 | sub                 ecx, dword ptr [eax]
            //   898db4fcffff         | mov                 dword ptr [ebp - 0x34c], ecx
            //   c785b8fcffff00000000     | mov    dword ptr [ebp - 0x348], 0

        $sequence_5 = { 8985a0fdffff db85a0fdffff dc0d???????? d99d9cfdffff d9859cfdffff 51 d91c24 }
            // n = 7, score = 100
            //   8985a0fdffff         | mov                 dword ptr [ebp - 0x260], eax
            //   db85a0fdffff         | fild                dword ptr [ebp - 0x260]
            //   dc0d????????         |                     
            //   d99d9cfdffff         | fstp                dword ptr [ebp - 0x264]
            //   d9859cfdffff         | fld                 dword ptr [ebp - 0x264]
            //   51                   | push                ecx
            //   d91c24               | fstp                dword ptr [esp]

        $sequence_6 = { c1f905 8d3c8dc0e94400 8bf0 83e61f c1e606 8b0f 0fbe4c0e04 }
            // n = 7, score = 100
            //   c1f905               | sar                 ecx, 5
            //   8d3c8dc0e94400       | lea                 edi, [ecx*4 + 0x44e9c0]
            //   8bf0                 | mov                 esi, eax
            //   83e61f               | and                 esi, 0x1f
            //   c1e606               | shl                 esi, 6
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   0fbe4c0e04           | movsx               ecx, byte ptr [esi + ecx + 4]

        $sequence_7 = { 52 e8???????? 83c404 e8???????? 58 33c0 83f800 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   33c0                 | xor                 eax, eax
            //   83f800               | cmp                 eax, 0

        $sequence_8 = { 3b4db0 7f0b 8b55a0 83c201 8955a0 ebda 8b45a0 }
            // n = 7, score = 100
            //   3b4db0               | cmp                 ecx, dword ptr [ebp - 0x50]
            //   7f0b                 | jg                  0xd
            //   8b55a0               | mov                 edx, dword ptr [ebp - 0x60]
            //   83c201               | add                 edx, 1
            //   8955a0               | mov                 dword ptr [ebp - 0x60], edx
            //   ebda                 | jmp                 0xffffffdc
            //   8b45a0               | mov                 eax, dword ptr [ebp - 0x60]

        $sequence_9 = { 56 57 6a5a 6a3e 68???????? 8d85a8f9ffff 50 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a5a                 | push                0x5a
            //   6a3e                 | push                0x3e
            //   68????????           |                     
            //   8d85a8f9ffff         | lea                 eax, [ebp - 0x658]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 770048
}