rule win_tinytyphon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.tinytyphon"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 8b08 c1e103 8b550c 890a 8b450c }
            // n = 5, score = 200
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   c1e103               | shl                 ecx, 3
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   890a                 | mov                 dword ptr [edx], ecx
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_1 = { 8b4508 039080000000 8b4ddc 8d9411b15bffff 8955dc 8b45dc c1e011 }
            // n = 7, score = 200
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   039080000000         | add                 edx, dword ptr [eax + 0x80]
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   8d9411b15bffff       | lea                 edx, [ecx + edx - 0xa44f]
            //   8955dc               | mov                 dword ptr [ebp - 0x24], edx
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   c1e011               | shl                 eax, 0x11

        $sequence_2 = { 898a90000000 8b45f8 3345e4 2345e0 3345e4 }
            // n = 5, score = 200
            //   898a90000000         | mov                 dword ptr [edx + 0x90], ecx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   3345e4               | xor                 eax, dword ptr [ebp - 0x1c]
            //   2345e0               | and                 eax, dword ptr [ebp - 0x20]
            //   3345e4               | xor                 eax, dword ptr [ebp - 0x1c]

        $sequence_3 = { 8d941105e9e3a9 8955f8 8b45f8 c1e005 8b4df8 }
            // n = 5, score = 200
            //   8d941105e9e3a9       | lea                 edx, [ecx + edx - 0x561c16fb]
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   c1e005               | shl                 eax, 5
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]

        $sequence_4 = { 8b4d0c 8d540118 52 e8???????? 83c40c 6a40 8b450c }
            // n = 7, score = 200
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8d540118             | lea                 edx, [ecx + eax + 0x18]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a40                 | push                0x40
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_5 = { ff15???????? 8d45ec 50 e8???????? 83c404 8945fc 833d????????00 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   833d????????00       |                     

        $sequence_6 = { b801000000 eb28 837d0c00 7420 }
            // n = 4, score = 200
            //   b801000000           | mov                 eax, 1
            //   eb28                 | jmp                 0x2a
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7420                 | je                  0x22

        $sequence_7 = { 3355e4 8b4508 035074 8b4de0 8d941197ff2a43 8955e0 }
            // n = 6, score = 200
            //   3355e4               | xor                 edx, dword ptr [ebp - 0x1c]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   035074               | add                 edx, dword ptr [eax + 0x74]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8d941197ff2a43       | lea                 edx, [ecx + edx + 0x432aff97]
            //   8955e0               | mov                 dword ptr [ebp - 0x20], edx

        $sequence_8 = { 50 ff15???????? 8945f8 c745fc00000000 8b45f8 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_9 = { c745e400000000 eb08 8b55e0 8b02 8945e0 }
            // n = 5, score = 200
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0
            //   eb08                 | jmp                 0xa
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax

    condition:
        7 of them and filesize < 90112
}