rule win_zebrocy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        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 = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 0110 5e 5f 5d }
            // n = 4, score = 100
            //   0110                 | add                 dword ptr [eax], edx
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp

        $sequence_5 = { 52 57 6689858af6ffff ff15???????? }
            // n = 4, score = 100
            //   52                   | push                edx
            //   57                   | push                edi
            //   6689858af6ffff       | mov                 word ptr [ebp - 0x976], ax
            //   ff15????????         |                     

        $sequence_6 = { 8d3c85c0a84200 e8???????? 83e01f c1e006 0307 }
            // n = 5, score = 100
            //   8d3c85c0a84200       | lea                 edi, dword ptr [eax*4 + 0x42a8c0]
            //   e8????????           |                     
            //   83e01f               | and                 eax, 0x1f
            //   c1e006               | shl                 eax, 6
            //   0307                 | add                 eax, dword ptr [edi]

        $sequence_7 = { 83e948 e9???????? 8b542408 8d420c 8b8a24ffffff 33c8 }
            // n = 6, score = 100
            //   83e948               | sub                 ecx, 0x48
            //   e9????????           |                     
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, dword ptr [edx + 0xc]
            //   8b8a24ffffff         | mov                 ecx, dword ptr [edx - 0xdc]
            //   33c8                 | xor                 ecx, eax

        $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 = { c645fc09 e8???????? 6aff 8bc6 50 ba???????? e8???????? }
            // n = 7, score = 100
            //   c645fc09             | mov                 byte ptr [ebp - 4], 9
            //   e8????????           |                     
            //   6aff                 | push                -1
            //   8bc6                 | mov                 eax, esi
            //   50                   | push                eax
            //   ba????????           |                     
            //   e8????????           |                     

        $sequence_11 = { 8be5 5d c21000 e8???????? 3c01 7511 }
            // n = 6, score = 100
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c21000               | ret                 0x10
            //   e8????????           |                     
            //   3c01                 | cmp                 al, 1
            //   7511                 | jne                 0x13

        $sequence_12 = { 57 33ff ffb710904200 ff15???????? 898710904200 83c704 83ff28 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   ffb710904200         | push                dword ptr [edi + 0x429010]
            //   ff15????????         |                     
            //   898710904200         | mov                 dword ptr [edi + 0x429010], eax
            //   83c704               | add                 edi, 4
            //   83ff28               | cmp                 edi, 0x28

        $sequence_13 = { 7542 83ec1c 8bcc 89a57cffffff 68???????? e8???????? 8d7d80 }
            // n = 7, score = 100
            //   7542                 | jne                 0x44
            //   83ec1c               | sub                 esp, 0x1c
            //   8bcc                 | mov                 ecx, esp
            //   89a57cffffff         | mov                 dword ptr [ebp - 0x84], esp
            //   68????????           |                     
            //   e8????????           |                     
            //   8d7d80               | lea                 edi, dword ptr [ebp - 0x80]

        $sequence_14 = { 0103 8b0e ba???????? e8???????? }
            // n = 4, score = 100
            //   0103                 | add                 dword ptr [ebx], eax
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   ba????????           |                     
            //   e8????????           |                     

        $sequence_15 = { 7306 8d8db4f6ffff 33d2 668995ecf6ffff }
            // n = 4, score = 100
            //   7306                 | jae                 8
            //   8d8db4f6ffff         | lea                 ecx, dword ptr [ebp - 0x94c]
            //   33d2                 | xor                 edx, edx
            //   668995ecf6ffff       | mov                 word ptr [ebp - 0x914], dx

    condition:
        7 of them and filesize < 393216
}