rule win_chinoxy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 85db 7405 803b00 7505 bb???????? 8bfe 83c9ff }
            // n = 7, score = 100
            //   85db                 | test                ebx, ebx
            //   7405                 | je                  7
            //   803b00               | cmp                 byte ptr [ebx], 0
            //   7505                 | jne                 7
            //   bb????????           |                     
            //   8bfe                 | mov                 edi, esi
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_1 = { 8bc2 5f 2bc5 5e 5d 03c1 5b }
            // n = 7, score = 100
            //   8bc2                 | mov                 eax, edx
            //   5f                   | pop                 edi
            //   2bc5                 | sub                 eax, ebp
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   03c1                 | add                 eax, ecx
            //   5b                   | pop                 ebx

        $sequence_2 = { ffd7 8b860c810100 50 ffd7 }
            // n = 4, score = 100
            //   ffd7                 | call                edi
            //   8b860c810100         | mov                 eax, dword ptr [esi + 0x1810c]
            //   50                   | push                eax
            //   ffd7                 | call                edi

        $sequence_3 = { 7322 85c0 741e 3bc6 7412 8b5004 }
            // n = 6, score = 100
            //   7322                 | jae                 0x24
            //   85c0                 | test                eax, eax
            //   741e                 | je                  0x20
            //   3bc6                 | cmp                 eax, esi
            //   7412                 | je                  0x14
            //   8b5004               | mov                 edx, dword ptr [eax + 4]

        $sequence_4 = { 85f6 0f84a5020000 8b5c2430 85db 7405 803b00 }
            // n = 6, score = 100
            //   85f6                 | test                esi, esi
            //   0f84a5020000         | je                  0x2ab
            //   8b5c2430             | mov                 ebx, dword ptr [esp + 0x30]
            //   85db                 | test                ebx, ebx
            //   7405                 | je                  7
            //   803b00               | cmp                 byte ptr [ebx], 0

        $sequence_5 = { 8b591c 33eb 33db 33c5 89442414 8be8 8a5c2416 }
            // n = 7, score = 100
            //   8b591c               | mov                 ebx, dword ptr [ecx + 0x1c]
            //   33eb                 | xor                 ebp, ebx
            //   33db                 | xor                 ebx, ebx
            //   33c5                 | xor                 eax, ebp
            //   89442414             | mov                 dword ptr [esp + 0x14], eax
            //   8be8                 | mov                 ebp, eax
            //   8a5c2416             | mov                 bl, byte ptr [esp + 0x16]

        $sequence_6 = { 8b5008 895310 75a7 8b85f0020000 8dbde8020000 89470c 8b4008 }
            // n = 7, score = 100
            //   8b5008               | mov                 edx, dword ptr [eax + 8]
            //   895310               | mov                 dword ptr [ebx + 0x10], edx
            //   75a7                 | jne                 0xffffffa9
            //   8b85f0020000         | mov                 eax, dword ptr [ebp + 0x2f0]
            //   8dbde8020000         | lea                 edi, [ebp + 0x2e8]
            //   89470c               | mov                 dword ptr [edi + 0xc], eax
            //   8b4008               | mov                 eax, dword ptr [eax + 8]

        $sequence_7 = { 8bf0 83c410 85f6 7519 57 e8???????? }
            // n = 6, score = 100
            //   8bf0                 | mov                 esi, eax
            //   83c410               | add                 esp, 0x10
            //   85f6                 | test                esi, esi
            //   7519                 | jne                 0x1b
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_8 = { e8???????? 8b5c243c c1e802 85db 752b 85c0 7655 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b5c243c             | mov                 ebx, dword ptr [esp + 0x3c]
            //   c1e802               | shr                 eax, 2
            //   85db                 | test                ebx, ebx
            //   752b                 | jne                 0x2d
            //   85c0                 | test                eax, eax
            //   7655                 | jbe                 0x57

        $sequence_9 = { 0f853affffff c7863420000008000000 8bce e8???????? 8b863c200000 85c0 0f859d000000 }
            // n = 7, score = 100
            //   0f853affffff         | jne                 0xffffff40
            //   c7863420000008000000     | mov    dword ptr [esi + 0x2034], 8
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b863c200000         | mov                 eax, dword ptr [esi + 0x203c]
            //   85c0                 | test                eax, eax
            //   0f859d000000         | jne                 0xa3

    condition:
        7 of them and filesize < 1138688
}