rule win_zebrocy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.zebrocy."
        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.zebrocy"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 014158 11515c e8???????? dc6360 }
            // n = 4, score = 100
            //   014158               | add                 dword ptr [ecx + 0x58], eax
            //   11515c               | adc                 dword ptr [ecx + 0x5c], edx
            //   e8????????           |                     
            //   dc6360               | fsub                qword ptr [ebx + 0x60]

        $sequence_1 = { 0103 31d2 85ff 8b03 }
            // n = 4, score = 100
            //   0103                 | add                 dword ptr [ebx], eax
            //   31d2                 | xor                 edx, edx
            //   85ff                 | test                edi, edi
            //   8b03                 | mov                 eax, dword ptr [ebx]

        $sequence_2 = { 0103 83c41c 5b 5e }
            // n = 4, score = 100
            //   0103                 | add                 dword ptr [ebx], eax
            //   83c41c               | add                 esp, 0x1c
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi

        $sequence_3 = { 0110 8b7dd4 ba???????? 89470c }
            // n = 4, score = 100
            //   0110                 | add                 dword ptr [eax], edx
            //   8b7dd4               | mov                 edi, dword ptr [ebp - 0x2c]
            //   ba????????           |                     
            //   89470c               | mov                 dword ptr [edi + 0xc], eax

        $sequence_4 = { e8???????? 83c404 89b538f7ffff 899d34f7ffff 889d24f7ffff 39bda8f7ffff 720f }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   89b538f7ffff         | mov                 dword ptr [ebp - 0x8c8], esi
            //   899d34f7ffff         | mov                 dword ptr [ebp - 0x8cc], ebx
            //   889d24f7ffff         | mov                 byte ptr [ebp - 0x8dc], bl
            //   39bda8f7ffff         | cmp                 dword ptr [ebp - 0x858], edi
            //   720f                 | jb                  0x11

        $sequence_5 = { 39b58cf7ffff 89bde0f7ffff 899ddcf7ffff 889dccf7ffff 720f 8b8578f7ffff 50 }
            // n = 7, score = 100
            //   39b58cf7ffff         | cmp                 dword ptr [ebp - 0x874], esi
            //   89bde0f7ffff         | mov                 dword ptr [ebp - 0x820], edi
            //   899ddcf7ffff         | mov                 dword ptr [ebp - 0x824], ebx
            //   889dccf7ffff         | mov                 byte ptr [ebp - 0x834], bl
            //   720f                 | jb                  0x11
            //   8b8578f7ffff         | mov                 eax, dword ptr [ebp - 0x888]
            //   50                   | push                eax

        $sequence_6 = { 0103 8b0e ba???????? e8???????? }
            // n = 4, score = 100
            //   0103                 | add                 dword ptr [ebx], eax
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   ba????????           |                     
            //   e8????????           |                     

        $sequence_7 = { 7306 8d8d94f7ffff 8819 83f8ff }
            // n = 4, score = 100
            //   7306                 | jae                 8
            //   8d8d94f7ffff         | lea                 ecx, [ebp - 0x86c]
            //   8819                 | mov                 byte ptr [ecx], bl
            //   83f8ff               | cmp                 eax, -1

        $sequence_8 = { 0102 8b45d4 89500c 89c1 }
            // n = 4, score = 100
            //   0102                 | add                 dword ptr [edx], eax
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   89500c               | mov                 dword ptr [eax + 0xc], edx
            //   89c1                 | mov                 ecx, eax

        $sequence_9 = { 014150 8b550c 115154 014158 }
            // n = 4, score = 100
            //   014150               | add                 dword ptr [ecx + 0x50], eax
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   115154               | adc                 dword ptr [ecx + 0x54], edx
            //   014158               | add                 dword ptr [ecx + 0x58], eax

        $sequence_10 = { 89642458 e8???????? 8d7c2478 e8???????? 83c41c }
            // n = 5, score = 100
            //   89642458             | mov                 dword ptr [esp + 0x58], esp
            //   e8????????           |                     
            //   8d7c2478             | lea                 edi, [esp + 0x78]
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c

        $sequence_11 = { 8bf0 c1fe05 c1e106 030cb5c0a84200 eb02 }
            // n = 5, score = 100
            //   8bf0                 | mov                 esi, eax
            //   c1fe05               | sar                 esi, 5
            //   c1e106               | shl                 ecx, 6
            //   030cb5c0a84200       | add                 ecx, dword ptr [esi*4 + 0x42a8c0]
            //   eb02                 | jmp                 4

        $sequence_12 = { 668995ecf6ffff 8b95f4f4ffff 52 50 }
            // n = 4, score = 100
            //   668995ecf6ffff       | mov                 word ptr [ebp - 0x914], dx
            //   8b95f4f4ffff         | mov                 edx, dword ptr [ebp - 0xb0c]
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_13 = { 3bc8 730a 68???????? e8???????? 8bd1 2bd0 }
            // n = 6, score = 100
            //   3bc8                 | cmp                 ecx, eax
            //   730a                 | jae                 0xc
            //   68????????           |                     
            //   e8????????           |                     
            //   8bd1                 | mov                 edx, ecx
            //   2bd0                 | sub                 edx, eax

        $sequence_14 = { 8b4c1938 8b4124 833800 741b 8b4134 833800 7e13 }
            // n = 7, score = 100
            //   8b4c1938             | mov                 ecx, dword ptr [ecx + ebx + 0x38]
            //   8b4124               | mov                 eax, dword ptr [ecx + 0x24]
            //   833800               | cmp                 dword ptr [eax], 0
            //   741b                 | je                  0x1d
            //   8b4134               | mov                 eax, dword ptr [ecx + 0x34]
            //   833800               | cmp                 dword ptr [eax], 0
            //   7e13                 | jle                 0x15

        $sequence_15 = { 0110 5e 5f 5d }
            // n = 4, score = 100
            //   0110                 | add                 dword ptr [eax], edx
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp

    condition:
        7 of them and filesize < 393216
}