rule win_chinoxy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.chinoxy."
        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.chinoxy"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 5b c3 8b442414 57 56 53 50 }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   57                   | push                edi
            //   56                   | push                esi
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_1 = { 50 8bce ff9290000000 5f 8bc3 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   8bce                 | mov                 ecx, esi
            //   ff9290000000         | call                dword ptr [edx + 0x90]
            //   5f                   | pop                 edi
            //   8bc3                 | mov                 eax, ebx

        $sequence_2 = { 8bce ff5240 5f 8bc3 5e 5b c20400 }
            // n = 7, score = 100
            //   8bce                 | mov                 ecx, esi
            //   ff5240               | call                dword ptr [edx + 0x40]
            //   5f                   | pop                 edi
            //   8bc3                 | mov                 eax, ebx
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c20400               | ret                 4

        $sequence_3 = { 894610 8b460c 3bc6 75a9 8b830c010000 8db304010000 3bc6 }
            // n = 7, score = 100
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   3bc6                 | cmp                 eax, esi
            //   75a9                 | jne                 0xffffffab
            //   8b830c010000         | mov                 eax, dword ptr [ebx + 0x10c]
            //   8db304010000         | lea                 esi, [ebx + 0x104]
            //   3bc6                 | cmp                 eax, esi

        $sequence_4 = { 83ff04 723e 8b06 85c0 7508 5f b804000000 }
            // n = 7, score = 100
            //   83ff04               | cmp                 edi, 4
            //   723e                 | jb                  0x40
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax
            //   7508                 | jne                 0xa
            //   5f                   | pop                 edi
            //   b804000000           | mov                 eax, 4

        $sequence_5 = { 56 8b742410 57 8b06 33d0 33c0 89542414 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   57                   | push                edi
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   33d0                 | xor                 edx, eax
            //   33c0                 | xor                 eax, eax
            //   89542414             | mov                 dword ptr [esp + 0x14], edx

        $sequence_6 = { e8???????? 83c40c 6a00 6800100000 6a00 50 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a00                 | push                0
            //   6800100000           | push                0x1000
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 51 ffd7 8b9694800200 52 ffd7 8b8698800200 50 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   ffd7                 | call                edi
            //   8b9694800200         | mov                 edx, dword ptr [esi + 0x28094]
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   8b8698800200         | mov                 eax, dword ptr [esi + 0x28098]
            //   50                   | push                eax

        $sequence_8 = { 50 e8???????? 85c0 0f8cd6020000 8b4e1c 03c8 894e1c }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8cd6020000         | jl                  0x2dc
            //   8b4e1c               | mov                 ecx, dword ptr [esi + 0x1c]
            //   03c8                 | add                 ecx, eax
            //   894e1c               | mov                 dword ptr [esi + 0x1c], ecx

        $sequence_9 = { 3bc6 8b5008 895610 75a7 e9???????? 8b85a0020000 8db598020000 }
            // n = 7, score = 100
            //   3bc6                 | cmp                 eax, esi
            //   8b5008               | mov                 edx, dword ptr [eax + 8]
            //   895610               | mov                 dword ptr [esi + 0x10], edx
            //   75a7                 | jne                 0xffffffa9
            //   e9????????           |                     
            //   8b85a0020000         | mov                 eax, dword ptr [ebp + 0x2a0]
            //   8db598020000         | lea                 esi, [ebp + 0x298]

    condition:
        7 of them and filesize < 1138688
}