rule win_zeus_openssl_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.zeus_openssl."
        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.zeus_openssl"
        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 = { 8975f8 c745ec00000000 81fb3d020000 0f8d9f010000 8d815c0b0000 ba3d020000 2bd3 }
            // n = 7, score = 1300
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   81fb3d020000         | cmp                 ebx, 0x23d
            //   0f8d9f010000         | jge                 0x1a5
            //   8d815c0b0000         | lea                 eax, [ecx + 0xb5c]
            //   ba3d020000           | mov                 edx, 0x23d
            //   2bd3                 | sub                 edx, ebx

        $sequence_1 = { 814a1800900000 5e a810 7444 a840 741f }
            // n = 6, score = 1300
            //   814a1800900000       | or                  dword ptr [edx + 0x18], 0x9000
            //   5e                   | pop                 esi
            //   a810                 | test                al, 0x10
            //   7444                 | je                  0x46
            //   a840                 | test                al, 0x40
            //   741f                 | je                  0x21

        $sequence_2 = { f6c510 7405 80cd08 eb03 80e5f7 886dff }
            // n = 6, score = 1300
            //   f6c510               | test                ch, 0x10
            //   7405                 | je                  7
            //   80cd08               | or                  ch, 8
            //   eb03                 | jmp                 5
            //   80e5f7               | and                 ch, 0xf7
            //   886dff               | mov                 byte ptr [ebp - 1], ch

        $sequence_3 = { 66d3ef 83c0f5 6689beb8160000 eb11 8b4508 48 66d3e0 }
            // n = 7, score = 1300
            //   66d3ef               | shr                 di, cl
            //   83c0f5               | add                 eax, -0xb
            //   6689beb8160000       | mov                 word ptr [esi + 0x16b8], di
            //   eb11                 | jmp                 0x13
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   48                   | dec                 eax
            //   66d3e0               | shl                 ax, cl

        $sequence_4 = { 33c9 83e20f 7614 0fb6440e18 0306 3985e8fdffff 7449 }
            // n = 7, score = 1300
            //   33c9                 | xor                 ecx, ecx
            //   83e20f               | and                 edx, 0xf
            //   7614                 | jbe                 0x16
            //   0fb6440e18           | movzx               eax, byte ptr [esi + ecx + 0x18]
            //   0306                 | add                 eax, dword ptr [esi]
            //   3985e8fdffff         | cmp                 dword ptr [ebp - 0x218], eax
            //   7449                 | je                  0x4b

        $sequence_5 = { f6c510 7405 80cd08 eb03 80e5f7 886dff 0fb6f9 }
            // n = 7, score = 1300
            //   f6c510               | test                ch, 0x10
            //   7405                 | je                  7
            //   80cd08               | or                  ch, 8
            //   eb03                 | jmp                 5
            //   80e5f7               | and                 ch, 0xf7
            //   886dff               | mov                 byte ptr [ebp - 1], ch
            //   0fb6f9               | movzx               edi, cl

        $sequence_6 = { 837e6800 0f8443010000 8b4e6c 8b4638 33ff 8a5401ff 8b8ea0160000 }
            // n = 7, score = 1300
            //   837e6800             | cmp                 dword ptr [esi + 0x68], 0
            //   0f8443010000         | je                  0x149
            //   8b4e6c               | mov                 ecx, dword ptr [esi + 0x6c]
            //   8b4638               | mov                 eax, dword ptr [esi + 0x38]
            //   33ff                 | xor                 edi, edi
            //   8a5401ff             | mov                 dl, byte ptr [ecx + eax - 1]
            //   8b8ea0160000         | mov                 ecx, dword ptr [esi + 0x16a0]

        $sequence_7 = { 814a1800300000 8a6207 84e4 7543 8ac1 }
            // n = 5, score = 1300
            //   814a1800300000       | or                  dword ptr [edx + 0x18], 0x3000
            //   8a6207               | mov                 ah, byte ptr [edx + 7]
            //   84e4                 | test                ah, ah
            //   7543                 | jne                 0x45
            //   8ac1                 | mov                 al, cl

        $sequence_8 = { 8986bc160000 83f90c 7e52 8b7d0c 8b5614 83c7fc 668bc7 }
            // n = 7, score = 1300
            //   8986bc160000         | mov                 dword ptr [esi + 0x16bc], eax
            //   83f90c               | cmp                 ecx, 0xc
            //   7e52                 | jle                 0x54
            //   8b7d0c               | mov                 edi, dword ptr [ebp + 0xc]
            //   8b5614               | mov                 edx, dword ptr [esi + 0x14]
            //   83c7fc               | add                 edi, -4
            //   668bc7               | mov                 ax, di

        $sequence_9 = { 83e20f 7614 0fb6440e18 0306 }
            // n = 4, score = 1300
            //   83e20f               | and                 edx, 0xf
            //   7614                 | jbe                 0x16
            //   0fb6440e18           | movzx               eax, byte ptr [esi + ecx + 0x18]
            //   0306                 | add                 eax, dword ptr [esi]

    condition:
        7 of them and filesize < 4546560
}