rule win_silon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.silon."
        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.silon"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8d8df8fdffff 51 6a00 8b95fcfdffff 52 }
            // n = 5, score = 200
            //   8d8df8fdffff         | lea                 ecx, [ebp - 0x208]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   8b95fcfdffff         | mov                 edx, dword ptr [ebp - 0x204]
            //   52                   | push                edx

        $sequence_1 = { 83c201 895594 8b4594 3b8578ffffff 0f839c010000 c78560fdffff00000000 }
            // n = 6, score = 200
            //   83c201               | add                 edx, 1
            //   895594               | mov                 dword ptr [ebp - 0x6c], edx
            //   8b4594               | mov                 eax, dword ptr [ebp - 0x6c]
            //   3b8578ffffff         | cmp                 eax, dword ptr [ebp - 0x88]
            //   0f839c010000         | jae                 0x1a2
            //   c78560fdffff00000000     | mov    dword ptr [ebp - 0x2a0], 0

        $sequence_2 = { 52 e8???????? 83c410 85c0 0f84fc000000 c745dc14000000 }
            // n = 6, score = 200
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   0f84fc000000         | je                  0x102
            //   c745dc14000000       | mov                 dword ptr [ebp - 0x24], 0x14

        $sequence_3 = { 8b4dfc 51 e8???????? 83c40c 8945fc 8b55fc 52 }
            // n = 7, score = 200
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   52                   | push                edx

        $sequence_4 = { 52 8b45dc 6bc024 8b0d???????? 8b540118 52 e8???????? }
            // n = 7, score = 200
            //   52                   | push                edx
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   6bc024               | imul                eax, eax, 0x24
            //   8b0d????????         |                     
            //   8b540118             | mov                 edx, dword ptr [ecx + eax + 0x18]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_5 = { 8b45dc 6bc024 8b0d???????? 8b540118 52 8b4508 8b8854080000 }
            // n = 7, score = 200
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   6bc024               | imul                eax, eax, 0x24
            //   8b0d????????         |                     
            //   8b540118             | mov                 edx, dword ptr [ecx + eax + 0x18]
            //   52                   | push                edx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b8854080000         | mov                 ecx, dword ptr [eax + 0x854]

        $sequence_6 = { 8b55f0 8b02 8b4df0 51 8b500c ffd2 }
            // n = 6, score = 200
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   51                   | push                ecx
            //   8b500c               | mov                 edx, dword ptr [eax + 0xc]
            //   ffd2                 | call                edx

        $sequence_7 = { c785e8fdffff00000000 c785ecfdffff00000000 6a00 6a00 6a00 6a00 }
            // n = 6, score = 200
            //   c785e8fdffff00000000     | mov    dword ptr [ebp - 0x218], 0
            //   c785ecfdffff00000000     | mov    dword ptr [ebp - 0x214], 0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_8 = { 0fbe11 c1e202 8b856cffffff 6689544590 ebcc 8d4d90 }
            // n = 6, score = 200
            //   0fbe11               | movsx               edx, byte ptr [ecx]
            //   c1e202               | shl                 edx, 2
            //   8b856cffffff         | mov                 eax, dword ptr [ebp - 0x94]
            //   6689544590           | mov                 word ptr [ebp + eax*2 - 0x70], dx
            //   ebcc                 | jmp                 0xffffffce
            //   8d4d90               | lea                 ecx, [ebp - 0x70]

        $sequence_9 = { 8d4518 50 8b4d14 51 8b55f4 52 e8???????? }
            // n = 7, score = 200
            //   8d4518               | lea                 eax, [ebp + 0x18]
            //   50                   | push                eax
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   51                   | push                ecx
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   52                   | push                edx
            //   e8????????           |                     

    condition:
        7 of them and filesize < 122880
}