rule win_jssloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.jssloader."
        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.jssloader"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 0f10856cfdffff c7401000000000 c6856cfdffff00 0f1100 c78594fdffff00000000 }
            // n = 5, score = 200
            //   0f10856cfdffff       | movups              xmm0, xmmword ptr [ebp - 0x294]
            //   c7401000000000       | mov                 dword ptr [eax + 0x10], 0
            //   c6856cfdffff00       | mov                 byte ptr [ebp - 0x294], 0
            //   0f1100               | movups              xmmword ptr [eax], xmm0
            //   c78594fdffff00000000     | mov    dword ptr [ebp - 0x26c], 0

        $sequence_1 = { 0f8768060000 e9???????? e8???????? 8bc8 c645fc07 8b7114 8bc6 }
            // n = 7, score = 200
            //   0f8768060000         | ja                  0x66e
            //   e9????????           |                     
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   c645fc07             | mov                 byte ptr [ebp - 4], 7
            //   8b7114               | mov                 esi, dword ptr [ecx + 0x14]
            //   8bc6                 | mov                 eax, esi

        $sequence_2 = { 660f289820a84300 660f2835???????? 660f59cf 660f58d1 }
            // n = 4, score = 200
            //   660f289820a84300     | movapd              xmm3, xmmword ptr [eax + 0x43a820]
            //   660f2835????????     |                     
            //   660f59cf             | mulpd               xmm1, xmm7
            //   660f58d1             | addpd               xmm2, xmm1

        $sequence_3 = { 68???????? 6a00 c785f0feffff00000000 c785f4feffff0f000000 c685e0feffff00 ff15???????? 8d4b04 }
            // n = 7, score = 200
            //   68????????           |                     
            //   6a00                 | push                0
            //   c785f0feffff00000000     | mov    dword ptr [ebp - 0x110], 0
            //   c785f4feffff0f000000     | mov    dword ptr [ebp - 0x10c], 0xf
            //   c685e0feffff00       | mov                 byte ptr [ebp - 0x120], 0
            //   ff15????????         |                     
            //   8d4b04               | lea                 ecx, dword ptr [ebx + 4]

        $sequence_4 = { 51 e8???????? 83c408 8b85bcfeffff c745ac00000000 c745b00f000000 c6459c00 }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b85bcfeffff         | mov                 eax, dword ptr [ebp - 0x144]
            //   c745ac00000000       | mov                 dword ptr [ebp - 0x54], 0
            //   c745b00f000000       | mov                 dword ptr [ebp - 0x50], 0xf
            //   c6459c00             | mov                 byte ptr [ebp - 0x64], 0

        $sequence_5 = { 8d4dc0 e8???????? 8b5dd0 c645fc03 8d55c0 837dd410 8d8de8feffff }
            // n = 7, score = 200
            //   8d4dc0               | lea                 ecx, dword ptr [ebp - 0x40]
            //   e8????????           |                     
            //   8b5dd0               | mov                 ebx, dword ptr [ebp - 0x30]
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   8d55c0               | lea                 edx, dword ptr [ebp - 0x40]
            //   837dd410             | cmp                 dword ptr [ebp - 0x2c], 0x10
            //   8d8de8feffff         | lea                 ecx, dword ptr [ebp - 0x118]

        $sequence_6 = { 83f81f 0f872b010000 52 51 e8???????? 83c408 837e1410 }
            // n = 7, score = 200
            //   83f81f               | cmp                 eax, 0x1f
            //   0f872b010000         | ja                  0x131
            //   52                   | push                edx
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   837e1410             | cmp                 dword ptr [esi + 0x14], 0x10

        $sequence_7 = { c1fa06 8bce 83e13f 6bc938 8b0495701d4400 c644082801 8b0495701d4400 }
            // n = 7, score = 200
            //   c1fa06               | sar                 edx, 6
            //   8bce                 | mov                 ecx, esi
            //   83e13f               | and                 ecx, 0x3f
            //   6bc938               | imul                ecx, ecx, 0x38
            //   8b0495701d4400       | mov                 eax, dword ptr [edx*4 + 0x441d70]
            //   c644082801           | mov                 byte ptr [eax + ecx + 0x28], 1
            //   8b0495701d4400       | mov                 eax, dword ptr [edx*4 + 0x441d70]

        $sequence_8 = { 03f0 56 e8???????? 8b8534ffffff 83c40c 8b8d54feffff }
            // n = 6, score = 200
            //   03f0                 | add                 esi, eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b8534ffffff         | mov                 eax, dword ptr [ebp - 0xcc]
            //   83c40c               | add                 esp, 0xc
            //   8b8d54feffff         | mov                 ecx, dword ptr [ebp - 0x1ac]

        $sequence_9 = { 57 8b7d08 eb6f 8b07 8d1c85581a4400 8b33 85f6 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   eb6f                 | jmp                 0x71
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8d1c85581a4400       | lea                 ebx, dword ptr [eax*4 + 0x441a58]
            //   8b33                 | mov                 esi, dword ptr [ebx]
            //   85f6                 | test                esi, esi

    condition:
        7 of them and filesize < 581632
}