rule win_rikamanu_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rikamanu."
        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.rikamanu"
        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 = { e8???????? 6a14 ff15???????? a801 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   6a14                 | push                0x14
            //   ff15????????         |                     
            //   a801                 | test                al, 1

        $sequence_1 = { 50 ff15???????? 8b35???????? 3d80969800 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   3d80969800           | cmp                 eax, 0x989680

        $sequence_2 = { 51 c7442410e0704000 e8???????? 8b54240c }
            // n = 4, score = 100
            //   51                   | push                ecx
            //   c7442410e0704000     | mov                 dword ptr [esp + 0x10], 0x4070e0
            //   e8????????           |                     
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]

        $sequence_3 = { 33c0 c3 8bc8 83e01f c1f905 8b0c8de0b84000 8a44c104 }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 
            //   8bc8                 | mov                 ecx, eax
            //   83e01f               | and                 eax, 0x1f
            //   c1f905               | sar                 ecx, 5
            //   8b0c8de0b84000       | mov                 ecx, dword ptr [ecx*4 + 0x40b8e0]
            //   8a44c104             | mov                 al, byte ptr [ecx + eax*8 + 4]

        $sequence_4 = { 83c40c 33c0 6808020000 8d95f4fdffff }
            // n = 4, score = 100
            //   83c40c               | add                 esp, 0xc
            //   33c0                 | xor                 eax, eax
            //   6808020000           | push                0x208
            //   8d95f4fdffff         | lea                 edx, [ebp - 0x20c]

        $sequence_5 = { 0f841f020000 83c9ff bf???????? 33c0 68???????? f2ae f7d1 }
            // n = 7, score = 100
            //   0f841f020000         | je                  0x225
            //   83c9ff               | or                  ecx, 0xffffffff
            //   bf????????           |                     
            //   33c0                 | xor                 eax, eax
            //   68????????           |                     
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx

        $sequence_6 = { 8dbc2430010000 83c9ff f2ae f7d1 2bf9 8bf7 8bfa }
            // n = 7, score = 100
            //   8dbc2430010000       | lea                 edi, [esp + 0x130]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   8bf7                 | mov                 esi, edi
            //   8bfa                 | mov                 edi, edx

        $sequence_7 = { 3b04cd00992400 7413 41 83f92d }
            // n = 4, score = 100
            //   3b04cd00992400       | cmp                 eax, dword ptr [ecx*8 + 0x249900]
            //   7413                 | je                  0x15
            //   41                   | inc                 ecx
            //   83f92d               | cmp                 ecx, 0x2d

        $sequence_8 = { f3a5 8bca 83e103 f3a4 6a14 }
            // n = 5, score = 100
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   6a14                 | push                0x14

        $sequence_9 = { c6864b01000043 c74668e0932400 6a0d e8???????? 59 }
            // n = 5, score = 100
            //   c6864b01000043       | mov                 byte ptr [esi + 0x14b], 0x43
            //   c74668e0932400       | mov                 dword ptr [esi + 0x68], 0x2493e0
            //   6a0d                 | push                0xd
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_10 = { 52 8b15???????? 50 51 81e2ffff0000 52 68???????? }
            // n = 7, score = 100
            //   52                   | push                edx
            //   8b15????????         |                     
            //   50                   | push                eax
            //   51                   | push                ecx
            //   81e2ffff0000         | and                 edx, 0xffff
            //   52                   | push                edx
            //   68????????           |                     

        $sequence_11 = { 6880000000 83e103 6a04 f3a4 }
            // n = 4, score = 100
            //   6880000000           | push                0x80
            //   83e103               | and                 ecx, 3
            //   6a04                 | push                4
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]

        $sequence_12 = { 8b048560af4000 8d04c8 8b0b 8908 8a4d00 884804 }
            // n = 6, score = 100
            //   8b048560af4000       | mov                 eax, dword ptr [eax*4 + 0x40af60]
            //   8d04c8               | lea                 eax, [eax + ecx*8]
            //   8b0b                 | mov                 ecx, dword ptr [ebx]
            //   8908                 | mov                 dword ptr [eax], ecx
            //   8a4d00               | mov                 cl, byte ptr [ebp]
            //   884804               | mov                 byte ptr [eax + 4], cl

        $sequence_13 = { 898518e5ffff 8b8528e5ffff 8b0485383f4100 89853ce5ffff 397c0138 741c }
            // n = 6, score = 100
            //   898518e5ffff         | mov                 dword ptr [ebp - 0x1ae8], eax
            //   8b8528e5ffff         | mov                 eax, dword ptr [ebp - 0x1ad8]
            //   8b0485383f4100       | mov                 eax, dword ptr [eax*4 + 0x413f38]
            //   89853ce5ffff         | mov                 dword ptr [ebp - 0x1ac4], eax
            //   397c0138             | cmp                 dword ptr [ecx + eax + 0x38], edi
            //   741c                 | je                  0x1e

        $sequence_14 = { 68???????? 52 891d???????? c705????????01000000 ffd6 8b4dfc 5e }
            // n = 7, score = 100
            //   68????????           |                     
            //   52                   | push                edx
            //   891d????????         |                     
            //   c705????????01000000     |     
            //   ffd6                 | call                esi
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   5e                   | pop                 esi

        $sequence_15 = { e8???????? 8db604a64000 bf???????? a5 a5 59 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8db604a64000         | lea                 esi, [esi + 0x40a604]
            //   bf????????           |                     
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   59                   | pop                 ecx

        $sequence_16 = { 8d85ecfbffff 68???????? 50 e8???????? 83c410 8d85ecfbffff }
            // n = 6, score = 100
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]

        $sequence_17 = { ff15???????? a1???????? 8b0d???????? 83c40c 3bc1 7417 668b7616 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   a1????????           |                     
            //   8b0d????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   3bc1                 | cmp                 eax, ecx
            //   7417                 | je                  0x19
            //   668b7616             | mov                 si, word ptr [esi + 0x16]

        $sequence_18 = { 56 8b74240c 668b4616 663d1000 7512 }
            // n = 5, score = 100
            //   56                   | push                esi
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]
            //   668b4616             | mov                 ax, word ptr [esi + 0x16]
            //   663d1000             | cmp                 ax, 0x10
            //   7512                 | jne                 0x14

        $sequence_19 = { 8365fc00 8b049d383f4100 f644380401 740b 56 e8???????? 59 }
            // n = 7, score = 100
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8b049d383f4100       | mov                 eax, dword ptr [ebx*4 + 0x413f38]
            //   f644380401           | test                byte ptr [eax + edi + 4], 1
            //   740b                 | je                  0xd
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_20 = { ff35???????? ffd7 56 e8???????? 59 5e }
            // n = 6, score = 100
            //   ff35????????         |                     
            //   ffd7                 | call                edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   5e                   | pop                 esi

        $sequence_21 = { 7219 83f85a 7714 8088????????10 8ac8 80c120 8888a0a64000 }
            // n = 7, score = 100
            //   7219                 | jb                  0x1b
            //   83f85a               | cmp                 eax, 0x5a
            //   7714                 | ja                  0x16
            //   8088????????10       |                     
            //   8ac8                 | mov                 cl, al
            //   80c120               | add                 cl, 0x20
            //   8888a0a64000         | mov                 byte ptr [eax + 0x40a6a0], cl

        $sequence_22 = { 6a00 6a00 55 ffd7 bf???????? 83c9ff }
            // n = 6, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   55                   | push                ebp
            //   ffd7                 | call                edi
            //   bf????????           |                     
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_23 = { 53 50 e8???????? 68ff000000 8d85e9f9ffff }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   68ff000000           | push                0xff
            //   8d85e9f9ffff         | lea                 eax, [ebp - 0x617]

        $sequence_24 = { 8b95f0fdffff 53 50 6830040000 53 53 }
            // n = 6, score = 100
            //   8b95f0fdffff         | mov                 edx, dword ptr [ebp - 0x210]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   6830040000           | push                0x430
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_25 = { e8???????? 59 8bcf 83e71f c1f905 c1e706 8b0c8d383f4100 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bcf                 | mov                 ecx, edi
            //   83e71f               | and                 edi, 0x1f
            //   c1f905               | sar                 ecx, 5
            //   c1e706               | shl                 edi, 6
            //   8b0c8d383f4100       | mov                 ecx, dword ptr [ecx*4 + 0x413f38]

        $sequence_26 = { 2bf9 8bf7 8bd1 83c9ff bf???????? }
            // n = 5, score = 100
            //   2bf9                 | sub                 edi, ecx
            //   8bf7                 | mov                 esi, edi
            //   8bd1                 | mov                 edx, ecx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   bf????????           |                     

        $sequence_27 = { 33c0 39b810982400 0f8491000000 ff45e4 83c030 3df0000000 }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   39b810982400         | cmp                 dword ptr [eax + 0x249810], edi
            //   0f8491000000         | je                  0x97
            //   ff45e4               | inc                 dword ptr [ebp - 0x1c]
            //   83c030               | add                 eax, 0x30
            //   3df0000000           | cmp                 eax, 0xf0

        $sequence_28 = { 84c0 7429 0fb63e 0fb6c0 eb12 8b45e0 8a800c982400 }
            // n = 7, score = 100
            //   84c0                 | test                al, al
            //   7429                 | je                  0x2b
            //   0fb63e               | movzx               edi, byte ptr [esi]
            //   0fb6c0               | movzx               eax, al
            //   eb12                 | jmp                 0x14
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8a800c982400         | mov                 al, byte ptr [eax + 0x24980c]

        $sequence_29 = { 8d95f8feffff 6a5c 52 889c05f4feffff e8???????? 83c408 }
            // n = 6, score = 100
            //   8d95f8feffff         | lea                 edx, [ebp - 0x108]
            //   6a5c                 | push                0x5c
            //   52                   | push                edx
            //   889c05f4feffff       | mov                 byte ptr [ebp + eax - 0x10c], bl
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

    condition:
        7 of them and filesize < 212992
}