rule win_bandook_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.bandook."
        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.bandook"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 8bf1 c706???????? c74604???????? c7461c38a01c13 e8???????? f6450801 740b }
            // n = 7, score = 100
            //   8bf1                 | mov                 esi, ecx
            //   c706????????         |                     
            //   c74604????????       |                     
            //   c7461c38a01c13       | mov                 dword ptr [esi + 0x1c], 0x131ca038
            //   e8????????           |                     
            //   f6450801             | test                byte ptr [ebp + 8], 1
            //   740b                 | je                  0xd

        $sequence_1 = { 83c440 a3???????? ba???????? b9???????? 6a07 e8???????? 6a08 }
            // n = 7, score = 100
            //   83c440               | add                 esp, 0x40
            //   a3????????           |                     
            //   ba????????           |                     
            //   b9????????           |                     
            //   6a07                 | push                7
            //   e8????????           |                     
            //   6a08                 | push                8

        $sequence_2 = { e8???????? a3???????? ba???????? 6a09 b9???????? e8???????? 83c440 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   a3????????           |                     
            //   ba????????           |                     
            //   6a09                 | push                9
            //   b9????????           |                     
            //   e8????????           |                     
            //   83c440               | add                 esp, 0x40

        $sequence_3 = { 6a05 6a00 53 8d85f4f3ffff 50 68???????? 6a00 }
            // n = 7, score = 100
            //   6a05                 | push                5
            //   6a00                 | push                0
            //   53                   | push                ebx
            //   8d85f4f3ffff         | lea                 eax, [ebp - 0xc0c]
            //   50                   | push                eax
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_4 = { 75f7 8b8dc4f9ffff ba???????? 2bd1 0f1f440000 8a01 8d4901 }
            // n = 7, score = 100
            //   75f7                 | jne                 0xfffffff9
            //   8b8dc4f9ffff         | mov                 ecx, dword ptr [ebp - 0x63c]
            //   ba????????           |                     
            //   2bd1                 | sub                 edx, ecx
            //   0f1f440000           | nop                 dword ptr [eax + eax]
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   8d4901               | lea                 ecx, [ecx + 1]

        $sequence_5 = { 83f81f 0f87a1000000 eb73 8b45b0 80784900 0f84a1000000 }
            // n = 6, score = 100
            //   83f81f               | cmp                 eax, 0x1f
            //   0f87a1000000         | ja                  0xa7
            //   eb73                 | jmp                 0x75
            //   8b45b0               | mov                 eax, dword ptr [ebp - 0x50]
            //   80784900             | cmp                 byte ptr [eax + 0x49], 0
            //   0f84a1000000         | je                  0xa7

        $sequence_6 = { 0f84ed010000 6a10 8d8d80f7ffff 51 50 ff15???????? 83f8ff }
            // n = 7, score = 100
            //   0f84ed010000         | je                  0x1f3
            //   6a10                 | push                0x10
            //   8d8d80f7ffff         | lea                 ecx, [ebp - 0x880]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1

        $sequence_7 = { 83c40c 33c9 c745e801000000 83e801 746f 8b1d???????? 8bc3 }
            // n = 7, score = 100
            //   83c40c               | add                 esp, 0xc
            //   33c9                 | xor                 ecx, ecx
            //   c745e801000000       | mov                 dword ptr [ebp - 0x18], 1
            //   83e801               | sub                 eax, 1
            //   746f                 | je                  0x71
            //   8b1d????????         |                     
            //   8bc3                 | mov                 eax, ebx

        $sequence_8 = { 6a0e ba???????? a3???????? b9???????? e8???????? 6a0d ba???????? }
            // n = 7, score = 100
            //   6a0e                 | push                0xe
            //   ba????????           |                     
            //   a3????????           |                     
            //   b9????????           |                     
            //   e8????????           |                     
            //   6a0d                 | push                0xd
            //   ba????????           |                     

        $sequence_9 = { 50 e8???????? 83c404 8bd0 8bcf e8???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8bd0                 | mov                 edx, eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

    condition:
        7 of them and filesize < 23088128
}