rule win_flawedammyy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.flawedammyy."
        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.flawedammyy"
        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 = { 3b560c 7412 51 8d4e18 }
            // n = 4, score = 200
            //   3b560c               | cmp                 edx, dword ptr [esi + 0xc]
            //   7412                 | je                  0x14
            //   51                   | push                ecx
            //   8d4e18               | lea                 ecx, [esi + 0x18]

        $sequence_1 = { 3b573c 7ca8 8b5d1c 8b87dc000000 }
            // n = 4, score = 200
            //   3b573c               | cmp                 edx, dword ptr [edi + 0x3c]
            //   7ca8                 | jl                  0xffffffaa
            //   8b5d1c               | mov                 ebx, dword ptr [ebp + 0x1c]
            //   8b87dc000000         | mov                 eax, dword ptr [edi + 0xdc]

        $sequence_2 = { 3b58fc 0f8ebc000000 85c0 7514 }
            // n = 4, score = 200
            //   3b58fc               | cmp                 ebx, dword ptr [eax - 4]
            //   0f8ebc000000         | jle                 0xc2
            //   85c0                 | test                eax, eax
            //   7514                 | jne                 0x16

        $sequence_3 = { 0000 0404 0404 0404 0401 0404 }
            // n = 6, score = 200
            //   0000                 | add                 byte ptr [eax], al
            //   0404                 | add                 al, 4
            //   0404                 | add                 al, 4
            //   0404                 | add                 al, 4
            //   0401                 | add                 al, 1
            //   0404                 | add                 al, 4

        $sequence_4 = { 3b5634 7d22 8b4df8 8d4206 }
            // n = 4, score = 200
            //   3b5634               | cmp                 edx, dword ptr [esi + 0x34]
            //   7d22                 | jge                 0x24
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8d4206               | lea                 eax, [edx + 6]

        $sequence_5 = { 3b7d08 758e 8b75ec 8b7de8 }
            // n = 4, score = 200
            //   3b7d08               | cmp                 edi, dword ptr [ebp + 8]
            //   758e                 | jne                 0xffffff90
            //   8b75ec               | mov                 esi, dword ptr [ebp - 0x14]
            //   8b7de8               | mov                 edi, dword ptr [ebp - 0x18]

        $sequence_6 = { 50 e8???????? 8d8598f4ffff 50 8d85a8f8ffff 50 e8???????? }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d8598f4ffff         | lea                 eax, [ebp - 0xb68]
            //   50                   | push                eax
            //   8d85a8f8ffff         | lea                 eax, [ebp - 0x758]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 8d85b4faffff 50 8d85c0fdffff 68???????? 50 ff55f4 }
            // n = 6, score = 200
            //   8d85b4faffff         | lea                 eax, [ebp - 0x54c]
            //   50                   | push                eax
            //   8d85c0fdffff         | lea                 eax, [ebp - 0x240]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff55f4               | call                dword ptr [ebp - 0xc]

        $sequence_8 = { 3b5634 7ce8 eb76 8b4604 }
            // n = 4, score = 200
            //   3b5634               | cmp                 edx, dword ptr [esi + 0x34]
            //   7ce8                 | jl                  0xffffffea
            //   eb76                 | jmp                 0x78
            //   8b4604               | mov                 eax, dword ptr [esi + 4]

        $sequence_9 = { 81ec6c0c0000 53 56 57 68???????? 33db ff15???????? }
            // n = 7, score = 200
            //   81ec6c0c0000         | sub                 esp, 0xc6c
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   68????????           |                     
            //   33db                 | xor                 ebx, ebx
            //   ff15????????         |                     

        $sequence_10 = { 6a00 6a00 6800000080 8d85b8fcffff 50 ff15???????? }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6800000080           | push                0x80000000
            //   8d85b8fcffff         | lea                 eax, [ebp - 0x348]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_11 = { 8b87a4000000 03ca 33db 56 8945e4 894dfc }
            // n = 6, score = 200
            //   8b87a4000000         | mov                 eax, dword ptr [edi + 0xa4]
            //   03ca                 | add                 ecx, edx
            //   33db                 | xor                 ebx, ebx
            //   56                   | push                esi
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx

        $sequence_12 = { 85c0 0f8402030000 68b80b0000 e8???????? 8d85b8fbffff }
            // n = 5, score = 200
            //   85c0                 | test                eax, eax
            //   0f8402030000         | je                  0x308
            //   68b80b0000           | push                0xbb8
            //   e8????????           |                     
            //   8d85b8fbffff         | lea                 eax, [ebp - 0x448]

        $sequence_13 = { 3b5808 7e0f 8bce e8???????? }
            // n = 4, score = 200
            //   3b5808               | cmp                 ebx, dword ptr [eax + 8]
            //   7e0f                 | jle                 0x11
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_14 = { ffd3 8b45fc 80384d 0f85e6020000 }
            // n = 4, score = 200
            //   ffd3                 | call                ebx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   80384d               | cmp                 byte ptr [eax], 0x4d
            //   0f85e6020000         | jne                 0x2ec

        $sequence_15 = { 68f572993d 6a01 e8???????? 83c408 }
            // n = 4, score = 200
            //   68f572993d           | push                0x3d9972f5
            //   6a01                 | push                1
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_16 = { c1e702 eb60 8b46f8 834de4ff 49 c745e8ff000000 8b3c857c303400 }
            // n = 7, score = 100
            //   c1e702               | shl                 edi, 2
            //   eb60                 | jmp                 0x62
            //   8b46f8               | mov                 eax, dword ptr [esi - 8]
            //   834de4ff             | or                  dword ptr [ebp - 0x1c], 0xffffffff
            //   49                   | dec                 ecx
            //   c745e8ff000000       | mov                 dword ptr [ebp - 0x18], 0xff
            //   8b3c857c303400       | mov                 edi, dword ptr [eax*4 + 0x34307c]

        $sequence_17 = { 56 53 8d85ccfdffff 68???????? 50 }
            // n = 5, score = 100
            //   56                   | push                esi
            //   53                   | push                ebx
            //   8d85ccfdffff         | lea                 eax, [ebp - 0x234]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_18 = { c3 55 8bec 83ec28 53 57 6a09 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec28               | sub                 esp, 0x28
            //   53                   | push                ebx
            //   57                   | push                edi
            //   6a09                 | push                9

        $sequence_19 = { eb07 c605????????00 c705????????4c403400 ff7508 ff15???????? }
            // n = 5, score = 100
            //   eb07                 | jmp                 9
            //   c605????????00       |                     
            //   c705????????4c403400     |     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     

        $sequence_20 = { 3bc3 895dc4 895dd0 891d???????? 741f 8b3d???????? }
            // n = 6, score = 100
            //   3bc3                 | cmp                 eax, ebx
            //   895dc4               | mov                 dword ptr [ebp - 0x3c], ebx
            //   895dd0               | mov                 dword ptr [ebp - 0x30], ebx
            //   891d????????         |                     
            //   741f                 | je                  0x21
            //   8b3d????????         |                     

        $sequence_21 = { ff15???????? 8bcf 83e809 2b4dfc }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   8bcf                 | mov                 ecx, edi
            //   83e809               | sub                 eax, 9
            //   2b4dfc               | sub                 ecx, dword ptr [ebp - 4]

        $sequence_22 = { 33c0 59 8dbd54ffffff c78550ffffff44000000 c745b80c000000 }
            // n = 5, score = 100
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   8dbd54ffffff         | lea                 edi, [ebp - 0xac]
            //   c78550ffffff44000000     | mov    dword ptr [ebp - 0xb0], 0x44
            //   c745b80c000000       | mov                 dword ptr [ebp - 0x48], 0xc

        $sequence_23 = { 68000000c0 56 ff15???????? 53 53 53 8bf8 }
            // n = 7, score = 100
            //   68000000c0           | push                0xc0000000
            //   56                   | push                esi
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8bf8                 | mov                 edi, eax

        $sequence_24 = { ff75e8 ff15???????? 395df0 0f8476010000 }
            // n = 4, score = 100
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ff15????????         |                     
            //   395df0               | cmp                 dword ptr [ebp - 0x10], ebx
            //   0f8476010000         | je                  0x17c

        $sequence_25 = { 8b480c 8b55fc 8d0c8a 894dfc eb0e 8b14957c303400 }
            // n = 6, score = 100
            //   8b480c               | mov                 ecx, dword ptr [eax + 0xc]
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8d0c8a               | lea                 ecx, [edx + ecx*4]
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   eb0e                 | jmp                 0x10
            //   8b14957c303400       | mov                 edx, dword ptr [edx*4 + 0x34307c]

        $sequence_26 = { 8b14957c303400 49 0fafd1 0155fc 46 }
            // n = 5, score = 100
            //   8b14957c303400       | mov                 edx, dword ptr [edx*4 + 0x34307c]
            //   49                   | dec                 ecx
            //   0fafd1               | imul                edx, ecx
            //   0155fc               | add                 dword ptr [ebp - 4], edx
            //   46                   | inc                 esi

        $sequence_27 = { 8b06 83661c00 83f807 0f87c9000000 ff248580233400 832700 }
            // n = 6, score = 100
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   83661c00             | and                 dword ptr [esi + 0x1c], 0
            //   83f807               | cmp                 eax, 7
            //   0f87c9000000         | ja                  0xcf
            //   ff248580233400       | jmp                 dword ptr [eax*4 + 0x342380]
            //   832700               | and                 dword ptr [edi], 0

        $sequence_28 = { 7518 8b46f8 8b04855c303400 c1e002 50 6a40 ff15???????? }
            // n = 7, score = 100
            //   7518                 | jne                 0x1a
            //   8b46f8               | mov                 eax, dword ptr [esi - 8]
            //   8b04855c303400       | mov                 eax, dword ptr [eax*4 + 0x34305c]
            //   c1e002               | shl                 eax, 2
            //   50                   | push                eax
            //   6a40                 | push                0x40
            //   ff15????????         |                     

        $sequence_29 = { 0f8781000000 ff248dfd243400 881f eb76 ff30 eb63 }
            // n = 6, score = 100
            //   0f8781000000         | ja                  0x87
            //   ff248dfd243400       | jmp                 dword ptr [ecx*4 + 0x3424fd]
            //   881f                 | mov                 byte ptr [edi], bl
            //   eb76                 | jmp                 0x78
            //   ff30                 | push                dword ptr [eax]
            //   eb63                 | jmp                 0x65

        $sequence_30 = { ff15???????? 8b75d8 e9???????? 8d85d0feffff }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   8b75d8               | mov                 esi, dword ptr [ebp - 0x28]
            //   e9????????           |                     
            //   8d85d0feffff         | lea                 eax, [ebp - 0x130]

        $sequence_31 = { 83f855 0f872affffff 0fb6805a213400 ff2485f6203400 8b8614080000 3b45f4 7e03 }
            // n = 7, score = 100
            //   83f855               | cmp                 eax, 0x55
            //   0f872affffff         | ja                  0xffffff30
            //   0fb6805a213400       | movzx               eax, byte ptr [eax + 0x34215a]
            //   ff2485f6203400       | jmp                 dword ptr [eax*4 + 0x3420f6]
            //   8b8614080000         | mov                 eax, dword ptr [esi + 0x814]
            //   3b45f4               | cmp                 eax, dword ptr [ebp - 0xc]
            //   7e03                 | jle                 5

    condition:
        7 of them and filesize < 1350656
}