rule win_zeus_openssl_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 745a 837b4000 7454 837b4400 744e 85d2 }
            // n = 6, score = 1300
            //   745a                 | je                  0x5c
            //   837b4000             | cmp                 dword ptr [ebx + 0x40], 0
            //   7454                 | je                  0x56
            //   837b4400             | cmp                 dword ptr [ebx + 0x44], 0
            //   744e                 | je                  0x50
            //   85d2                 | test                edx, edx

        $sequence_1 = { 8bf9 8b8fbc160000 83f90d 7e52 8b5708 56 }
            // n = 6, score = 1300
            //   8bf9                 | mov                 edi, ecx
            //   8b8fbc160000         | mov                 ecx, dword ptr [edi + 0x16bc]
            //   83f90d               | cmp                 ecx, 0xd
            //   7e52                 | jle                 0x54
            //   8b5708               | mov                 edx, dword ptr [edi + 8]
            //   56                   | push                esi

        $sequence_2 = { 85d2 744a 8bc6 d1e8 8bcf 8d0442 8983a4160000 }
            // n = 7, score = 1300
            //   85d2                 | test                edx, edx
            //   744a                 | je                  0x4c
            //   8bc6                 | mov                 eax, esi
            //   d1e8                 | shr                 eax, 1
            //   8bcf                 | mov                 ecx, edi
            //   8d0442               | lea                 eax, [edx + eax*2]
            //   8983a4160000         | mov                 dword ptr [ebx + 0x16a4], eax

        $sequence_3 = { 0f8547160000 83390b 7506 c7010c000000 8b500c }
            // n = 5, score = 1300
            //   0f8547160000         | jne                 0x164d
            //   83390b               | cmp                 dword ptr [ecx], 0xb
            //   7506                 | jne                 8
            //   c7010c000000         | mov                 dword ptr [ecx], 0xc
            //   8b500c               | mov                 edx, dword ptr [eax + 0xc]

        $sequence_4 = { 2bf0 0181c41b0000 8955f8 8b4140 8981c81b0000 c70116000000 }
            // n = 6, score = 1300
            //   2bf0                 | sub                 esi, eax
            //   0181c41b0000         | add                 dword ptr [ecx + 0x1bc4], eax
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   8b4140               | mov                 eax, dword ptr [ecx + 0x40]
            //   8981c81b0000         | mov                 dword ptr [ecx + 0x1bc8], eax
            //   c70116000000         | mov                 dword ptr [ecx], 0x16

        $sequence_5 = { 83feff 750a 8b1d???????? 33f6 eb03 }
            // n = 5, score = 1300
            //   83feff               | cmp                 esi, -1
            //   750a                 | jne                 0xc
            //   8b1d????????         |                     
            //   33f6                 | xor                 esi, esi
            //   eb03                 | jmp                 5

        $sequence_6 = { 83c608 03d0 895dfc 8955f8 897df0 3b75cc 72dc }
            // n = 7, score = 1300
            //   83c608               | add                 esi, 8
            //   03d0                 | add                 edx, eax
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   897df0               | mov                 dword ptr [ebp - 0x10], edi
            //   3b75cc               | cmp                 esi, dword ptr [ebp - 0x34]
            //   72dc                 | jb                  0xffffffde

        $sequence_7 = { 0f84c0000000 0fb74014 8b4e14 894d08 }
            // n = 4, score = 1300
            //   0f84c0000000         | je                  0xc6
            //   0fb74014             | movzx               eax, word ptr [eax + 0x14]
            //   8b4e14               | mov                 ecx, dword ptr [esi + 0x14]
            //   894d08               | mov                 dword ptr [ebp + 8], ecx

        $sequence_8 = { 6a01 50 8bce e8???????? 8b466c }
            // n = 5, score = 1300
            //   6a01                 | push                1
            //   50                   | push                eax
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b466c               | mov                 eax, dword ptr [esi + 0x6c]

        $sequence_9 = { 726d 8b8ea0160000 8b86a4160000 8a5660 bf01000000 66893c48 8b86a0160000 }
            // n = 7, score = 1300
            //   726d                 | jb                  0x6f
            //   8b8ea0160000         | mov                 ecx, dword ptr [esi + 0x16a0]
            //   8b86a4160000         | mov                 eax, dword ptr [esi + 0x16a4]
            //   8a5660               | mov                 dl, byte ptr [esi + 0x60]
            //   bf01000000           | mov                 edi, 1
            //   66893c48             | mov                 word ptr [eax + ecx*2], di
            //   8b86a0160000         | mov                 eax, dword ptr [esi + 0x16a0]

    condition:
        7 of them and filesize < 4546560
}