rule win_starsypound_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.starsypound."
        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.starsypound"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 6801010000 e8???????? 53 6a01 6a02 e8???????? }
            // n = 6, score = 100
            //   6801010000           | push                0x101
            //   e8????????           |                     
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   6a02                 | push                2
            //   e8????????           |                     

        $sequence_1 = { 50 e8???????? 83c40c 85c0 7e2b eb08 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   7e2b                 | jle                 0x2d
            //   eb08                 | jmp                 0xa

        $sequence_2 = { 85c0 7e2b eb08 6a32 ff15???????? 8b4500 6a00 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7e2b                 | jle                 0x2d
            //   eb08                 | jmp                 0xa
            //   6a32                 | push                0x32
            //   ff15????????         |                     
            //   8b4500               | mov                 eax, dword ptr [ebp]
            //   6a00                 | push                0

        $sequence_3 = { 6a10 51 55 89442424 e8???????? }
            // n = 5, score = 100
            //   6a10                 | push                0x10
            //   51                   | push                ecx
            //   55                   | push                ebp
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   e8????????           |                     

        $sequence_4 = { 6a18 e8???????? 8bb42424040000 8bd8 }
            // n = 4, score = 100
            //   6a18                 | push                0x18
            //   e8????????           |                     
            //   8bb42424040000       | mov                 esi, dword ptr [esp + 0x424]
            //   8bd8                 | mov                 ebx, eax

        $sequence_5 = { 51 6801010000 e8???????? 53 6a01 6a02 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   6801010000           | push                0x101
            //   e8????????           |                     
            //   53                   | push                ebx
            //   6a01                 | push                1
            //   6a02                 | push                2

        $sequence_6 = { 6a00 50 8d4c2424 56 }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   56                   | push                esi

        $sequence_7 = { e8???????? 83c418 83feff 0f84d9feffff b93f000000 33c0 8d7c2458 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   83feff               | cmp                 esi, -1
            //   0f84d9feffff         | je                  0xfffffedf
            //   b93f000000           | mov                 ecx, 0x3f
            //   33c0                 | xor                 eax, eax
            //   8d7c2458             | lea                 edi, [esp + 0x58]

        $sequence_8 = { 7470 8b3d???????? 8d542410 68???????? }
            // n = 4, score = 100
            //   7470                 | je                  0x72
            //   8b3d????????         |                     
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   68????????           |                     

        $sequence_9 = { 5e 5d 5b 81c4dc030000 c3 8d542430 66c74424140200 }
            // n = 7, score = 100
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   81c4dc030000         | add                 esp, 0x3dc
            //   c3                   | ret                 
            //   8d542430             | lea                 edx, [esp + 0x30]
            //   66c74424140200       | mov                 word ptr [esp + 0x14], 2

    condition:
        7 of them and filesize < 40960
}