rule win_vskimmer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.vskimmer"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 5e c3 6a5c 58 6689463c ebf2 }
            // n = 6, score = 100
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   6a5c                 | push                0x5c
            //   58                   | pop                 eax
            //   6689463c             | mov                 word ptr [esi + 0x3c], ax
            //   ebf2                 | jmp                 0xfffffff4

        $sequence_1 = { 8d85e8fdffff 50 8d8dc4fbffff e8???????? 83ec1c }
            // n = 5, score = 100
            //   8d85e8fdffff         | lea                 eax, [ebp - 0x218]
            //   50                   | push                eax
            //   8d8dc4fbffff         | lea                 ecx, [ebp - 0x43c]
            //   e8????????           |                     
            //   83ec1c               | sub                 esp, 0x1c

        $sequence_2 = { 6800040000 33db 8d8588f6ffff 53 }
            // n = 4, score = 100
            //   6800040000           | push                0x400
            //   33db                 | xor                 ebx, ebx
            //   8d8588f6ffff         | lea                 eax, [ebp - 0x978]
            //   53                   | push                ebx

        $sequence_3 = { 68???????? 8d45f4 50 c745f484034200 e8???????? cc 8bff }
            // n = 7, score = 100
            //   68????????           |                     
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   c745f484034200       | mov                 dword ptr [ebp - 0xc], 0x420384
            //   e8????????           |                     
            //   cc                   | int3                
            //   8bff                 | mov                 edi, edi

        $sequence_4 = { 75da 8b4508 8b4d10 8908 e9???????? 55 8bec }
            // n = 7, score = 100
            //   75da                 | jne                 0xffffffdc
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   8908                 | mov                 dword ptr [eax], ecx
            //   e9????????           |                     
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_5 = { 8b4604 57 8b3e 8945ec 8bc7 8945f0 }
            // n = 6, score = 100
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   57                   | push                edi
            //   8b3e                 | mov                 edi, dword ptr [esi]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8bc7                 | mov                 eax, edi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax

        $sequence_6 = { 50 ffb314020000 8d45f4 ff33 50 e8???????? 8b00 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ffb314020000         | push                dword ptr [ebx + 0x214]
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   ff33                 | push                dword ptr [ebx]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b00                 | mov                 eax, dword ptr [eax]

        $sequence_7 = { 837e1c00 7423 8b461c 8b4808 }
            // n = 4, score = 100
            //   837e1c00             | cmp                 dword ptr [esi + 0x1c], 0
            //   7423                 | je                  0x25
            //   8b461c               | mov                 eax, dword ptr [esi + 0x1c]
            //   8b4808               | mov                 ecx, dword ptr [eax + 8]

        $sequence_8 = { 03d7 2bd9 3bda 0f8391000000 52 8bce e8???????? }
            // n = 7, score = 100
            //   03d7                 | add                 edx, edi
            //   2bd9                 | sub                 ebx, ecx
            //   3bda                 | cmp                 ebx, edx
            //   0f8391000000         | jae                 0x97
            //   52                   | push                edx
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_9 = { 80fa29 7410 f6414410 750e 8a00 3c7b }
            // n = 6, score = 100
            //   80fa29               | cmp                 dl, 0x29
            //   7410                 | je                  0x12
            //   f6414410             | test                byte ptr [ecx + 0x44], 0x10
            //   750e                 | jne                 0x10
            //   8a00                 | mov                 al, byte ptr [eax]
            //   3c7b                 | cmp                 al, 0x7b

    condition:
        7 of them and filesize < 376832
}