rule win_cryptic_convo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.cryptic_convo."
        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.cryptic_convo"
        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 = { 66a5 8d7dc8 4f 8a4701 47 84c0 }
            // n = 6, score = 100
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   8d7dc8               | lea                 edi, [ebp - 0x38]
            //   4f                   | dec                 edi
            //   8a4701               | mov                 al, byte ptr [edi + 1]
            //   47                   | inc                 edi
            //   84c0                 | test                al, al

        $sequence_1 = { ff15???????? 8bd0 8995f4fcffff 3bd3 0f84ce000000 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8bd0                 | mov                 edx, eax
            //   8995f4fcffff         | mov                 dword ptr [ebp - 0x30c], edx
            //   3bd3                 | cmp                 edx, ebx
            //   0f84ce000000         | je                  0xd4

        $sequence_2 = { 399e88000000 7445 399e8c000000 743d 6a40 6800300000 ff7510 }
            // n = 7, score = 100
            //   399e88000000         | cmp                 dword ptr [esi + 0x88], ebx
            //   7445                 | je                  0x47
            //   399e8c000000         | cmp                 dword ptr [esi + 0x8c], ebx
            //   743d                 | je                  0x3f
            //   6a40                 | push                0x40
            //   6800300000           | push                0x3000
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_3 = { a5 a5 66a5 a4 8d7dc8 }
            // n = 5, score = 100
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   a4                   | movsb               byte ptr es:[edi], byte ptr [esi]
            //   8d7dc8               | lea                 edi, [ebp - 0x38]

        $sequence_4 = { 8b859c000000 53 56 57 be???????? }
            // n = 5, score = 100
            //   8b859c000000         | mov                 eax, dword ptr [ebp + 0x9c]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   be????????           |                     

        $sequence_5 = { 50 ff15???????? be???????? 8dbd70ffffff a5 a4 8dbd70ffffff }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   be????????           |                     
            //   8dbd70ffffff         | lea                 edi, [ebp - 0x90]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a4                   | movsb               byte ptr es:[edi], byte ptr [esi]
            //   8dbd70ffffff         | lea                 edi, [ebp - 0x90]

        $sequence_6 = { ff4d08 75de 5f 5b 8bc1 }
            // n = 5, score = 100
            //   ff4d08               | dec                 dword ptr [ebp + 8]
            //   75de                 | jne                 0xffffffe0
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx
            //   8bc1                 | mov                 eax, ecx

        $sequence_7 = { 750a 8b15???????? ff32 eb01 56 50 ff5150 }
            // n = 7, score = 100
            //   750a                 | jne                 0xc
            //   8b15????????         |                     
            //   ff32                 | push                dword ptr [edx]
            //   eb01                 | jmp                 3
            //   56                   | push                esi
            //   50                   | push                eax
            //   ff5150               | call                dword ptr [ecx + 0x50]

        $sequence_8 = { e8???????? 83c40c 8d85b0fdffff 50 ffb5b0feffff }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d85b0fdffff         | lea                 eax, [ebp - 0x250]
            //   50                   | push                eax
            //   ffb5b0feffff         | push                dword ptr [ebp - 0x150]

        $sequence_9 = { 33c0 40 eb11 68???????? 57 }
            // n = 5, score = 100
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   eb11                 | jmp                 0x13
            //   68????????           |                     
            //   57                   | push                edi

    condition:
        7 of them and filesize < 97280
}