rule win_sidewinder_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.sidewinder."
        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.sidewinder"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 8b4588 8b00 ff7588 ff5058 dbe2 894584 837d8400 }
            // n = 7, score = 200
            //   8b4588               | mov                 eax, dword ptr [ebp - 0x78]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   ff7588               | push                dword ptr [ebp - 0x78]
            //   ff5058               | call                dword ptr [eax + 0x58]
            //   dbe2                 | fnclex              
            //   894584               | mov                 dword ptr [ebp - 0x7c], eax
            //   837d8400             | cmp                 dword ptr [ebp - 0x7c], 0

        $sequence_1 = { 1bf6 f7de 6a23 ff75b8 e8???????? 0fb600 f7d8 }
            // n = 7, score = 200
            //   1bf6                 | sbb                 esi, esi
            //   f7de                 | neg                 esi
            //   6a23                 | push                0x23
            //   ff75b8               | push                dword ptr [ebp - 0x48]
            //   e8????????           |                     
            //   0fb600               | movzx               eax, byte ptr [eax]
            //   f7d8                 | neg                 eax

        $sequence_2 = { 8d855cffffff 50 8b8544ffffff 8b00 ffb544ffffff ff909c000000 dbe2 }
            // n = 7, score = 200
            //   8d855cffffff         | lea                 eax, [ebp - 0xa4]
            //   50                   | push                eax
            //   8b8544ffffff         | mov                 eax, dword ptr [ebp - 0xbc]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   ffb544ffffff         | push                dword ptr [ebp - 0xbc]
            //   ff909c000000         | call                dword ptr [eax + 0x9c]
            //   dbe2                 | fnclex              

        $sequence_3 = { 7d17 6a34 68???????? ff75b0 ff75c4 e8???????? 894590 }
            // n = 7, score = 200
            //   7d17                 | jge                 0x19
            //   6a34                 | push                0x34
            //   68????????           |                     
            //   ff75b0               | push                dword ptr [ebp - 0x50]
            //   ff75c4               | push                dword ptr [ebp - 0x3c]
            //   e8????????           |                     
            //   894590               | mov                 dword ptr [ebp - 0x70], eax

        $sequence_4 = { ff75ec 8d45dc 50 e8???????? 83a540ffffff00 83bd40ffffff14 7309 }
            // n = 7, score = 200
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83a540ffffff00       | and                 dword ptr [ebp - 0xc0], 0
            //   83bd40ffffff14       | cmp                 dword ptr [ebp - 0xc0], 0x14
            //   7309                 | jae                 0xb

        $sequence_5 = { 8b4dcc 660fb60c08 6683e103 666bc940 0f8022050000 8b4508 8b4048 }
            // n = 7, score = 200
            //   8b4dcc               | mov                 ecx, dword ptr [ebp - 0x34]
            //   660fb60c08           | movzx               cx, byte ptr [eax + ecx]
            //   6683e103             | and                 cx, 3
            //   666bc940             | imul                cx, cx, 0x40
            //   0f8022050000         | jo                  0x528
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4048               | mov                 eax, dword ptr [eax + 0x48]

        $sequence_6 = { 89857cffffff ff75d4 8b450c ff30 e8???????? 0fb600 83e82b }
            // n = 7, score = 200
            //   89857cffffff         | mov                 dword ptr [ebp - 0x84], eax
            //   ff75d4               | push                dword ptr [ebp - 0x2c]
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   ff30                 | push                dword ptr [eax]
            //   e8????????           |                     
            //   0fb600               | movzx               eax, byte ptr [eax]
            //   83e82b               | sub                 eax, 0x2b

        $sequence_7 = { dd5dd4 8d45d4 50 8b45ec 8b00 }
            // n = 5, score = 200
            //   dd5dd4               | fstp                qword ptr [ebp - 0x2c]
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   50                   | push                eax
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8b00                 | mov                 eax, dword ptr [eax]

        $sequence_8 = { 68???????? e8???????? f7d8 1bc0 f7d8 f7d8 }
            // n = 6, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax
            //   f7d8                 | neg                 eax

        $sequence_9 = { eb04 83659800 8b4508 8a4040 8845b8 6633c9 e8???????? }
            // n = 7, score = 200
            //   eb04                 | jmp                 6
            //   83659800             | and                 dword ptr [ebp - 0x68], 0
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8a4040               | mov                 al, byte ptr [eax + 0x40]
            //   8845b8               | mov                 byte ptr [ebp - 0x48], al
            //   6633c9               | xor                 cx, cx
            //   e8????????           |                     

    condition:
        7 of them and filesize < 679936
}