rule win_fatduke_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.fatduke."
        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.fatduke"
        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 = { c78540ffffff00000000 c78544ffffff00000000 c78544ffffff0f000000 c78540ffffff00000000 c68530ffffff00 803a00 7504 }
            // n = 7, score = 200
            //   c78540ffffff00000000     | mov    dword ptr [ebp - 0xc0], 0
            //   c78544ffffff00000000     | mov    dword ptr [ebp - 0xbc], 0
            //   c78544ffffff0f000000     | mov    dword ptr [ebp - 0xbc], 0xf
            //   c78540ffffff00000000     | mov    dword ptr [ebp - 0xc0], 0
            //   c68530ffffff00       | mov                 byte ptr [ebp - 0xd0], 0
            //   803a00               | cmp                 byte ptr [edx], 0
            //   7504                 | jne                 6

        $sequence_1 = { c645fc0e 837de010 720b ff75cc e8???????? 83c404 c745e00f000000 }
            // n = 7, score = 200
            //   c645fc0e             | mov                 byte ptr [ebp - 4], 0xe
            //   837de010             | cmp                 dword ptr [ebp - 0x20], 0x10
            //   720b                 | jb                  0xd
            //   ff75cc               | push                dword ptr [ebp - 0x34]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c745e00f000000       | mov                 dword ptr [ebp - 0x20], 0xf

        $sequence_2 = { c7863401000000000000 c6862401000000 c645fc0a 83be2001000010 720e ffb60c010000 e8???????? }
            // n = 7, score = 200
            //   c7863401000000000000     | mov    dword ptr [esi + 0x134], 0
            //   c6862401000000       | mov                 byte ptr [esi + 0x124], 0
            //   c645fc0a             | mov                 byte ptr [ebp - 4], 0xa
            //   83be2001000010       | cmp                 dword ptr [esi + 0x120], 0x10
            //   720e                 | jb                  0x10
            //   ffb60c010000         | push                dword ptr [esi + 0x10c]
            //   e8????????           |                     

        $sequence_3 = { 8d34c1 ff37 8bd6 e8???????? 83c404 ff75ec 51 }
            // n = 7, score = 200
            //   8d34c1               | lea                 esi, [ecx + eax*8]
            //   ff37                 | push                dword ptr [edi]
            //   8bd6                 | mov                 edx, esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   51                   | push                ecx

        $sequence_4 = { ff750c 8bf1 ff7508 c70600000000 c7460400000000 c7460800000000 e8???????? }
            // n = 7, score = 200
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8bf1                 | mov                 esi, ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   c7460400000000       | mov                 dword ptr [esi + 4], 0
            //   c7460800000000       | mov                 dword ptr [esi + 8], 0
            //   e8????????           |                     

        $sequence_5 = { e8???????? 83c418 c645fc0a 8b4dd0 8b01 ff5004 33c0 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   c645fc0a             | mov                 byte ptr [ebp - 4], 0xa
            //   8b4dd0               | mov                 ecx, dword ptr [ebp - 0x30]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff5004               | call                dword ptr [eax + 4]
            //   33c0                 | xor                 eax, eax

        $sequence_6 = { ff7620 e8???????? 83c404 c746340f000000 c7463000000000 c6462000 c745fcffffffff }
            // n = 7, score = 200
            //   ff7620               | push                dword ptr [esi + 0x20]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c746340f000000       | mov                 dword ptr [esi + 0x34], 0xf
            //   c7463000000000       | mov                 dword ptr [esi + 0x30], 0
            //   c6462000             | mov                 byte ptr [esi + 0x20], 0
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff

        $sequence_7 = { 7505 895110 eb1a 894de8 894de4 c645fc02 c701???????? }
            // n = 7, score = 200
            //   7505                 | jne                 7
            //   895110               | mov                 dword ptr [ecx + 0x10], edx
            //   eb1a                 | jmp                 0x1c
            //   894de8               | mov                 dword ptr [ebp - 0x18], ecx
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   c701????????         |                     

        $sequence_8 = { ff7510 c706???????? ff7508 e8???????? c745fcffffffff 8bc6 8b4df4 }
            // n = 7, score = 200
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   c706????????         |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   8bc6                 | mov                 eax, esi
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_9 = { e8???????? 5e 84c0 7407 8b4728 83700801 8bcf }
            // n = 7, score = 200
            //   e8????????           |                     
            //   5e                   | pop                 esi
            //   84c0                 | test                al, al
            //   7407                 | je                  9
            //   8b4728               | mov                 eax, dword ptr [edi + 0x28]
            //   83700801             | xor                 dword ptr [eax + 8], 1
            //   8bcf                 | mov                 ecx, edi

    condition:
        7 of them and filesize < 9012224
}