rule win_photoloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.photoloader."
        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.photoloader"
        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 = { c0c003 0fb6c8 8bc1 83e10f }
            // n = 4, score = 1000
            //   c0c003               | rol                 al, 3
            //   0fb6c8               | movzx               ecx, al
            //   8bc1                 | mov                 eax, ecx
            //   83e10f               | and                 ecx, 0xf

        $sequence_1 = { 895c2424 894c2428 8954242c 0f31 }
            // n = 4, score = 800
            //   895c2424             | mov                 dword ptr [esp + 0x24], ebx
            //   894c2428             | mov                 dword ptr [esp + 0x28], ecx
            //   8954242c             | mov                 dword ptr [esp + 0x2c], edx
            //   0f31                 | rdtsc               

        $sequence_2 = { 0fa2 894704 33c9 b800000040 0fa2 }
            // n = 5, score = 800
            //   0fa2                 | cpuid               
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   33c9                 | xor                 ecx, ecx
            //   b800000040           | mov                 eax, 0x40000000
            //   0fa2                 | cpuid               

        $sequence_3 = { 0f85c3000000 8b457f 85c0 0f84b8000000 8bd8 }
            // n = 5, score = 800
            //   0f85c3000000         | jne                 0xc9
            //   8b457f               | mov                 eax, dword ptr [ebp + 0x7f]
            //   85c0                 | test                eax, eax
            //   0f84b8000000         | je                  0xbe
            //   8bd8                 | mov                 ebx, eax

        $sequence_4 = { 25ffffff00 0d00000005 e9???????? 8bd7 397b1c }
            // n = 5, score = 800
            //   25ffffff00           | and                 eax, 0xffffff
            //   0d00000005           | or                  eax, 0x5000000
            //   e9????????           |                     
            //   8bd7                 | mov                 edx, edi
            //   397b1c               | cmp                 dword ptr [ebx + 0x1c], edi

        $sequence_5 = { 33c9 b801000000 0fa2 89442420 895c2424 894c2428 }
            // n = 6, score = 800
            //   33c9                 | xor                 ecx, ecx
            //   b801000000           | mov                 eax, 1
            //   0fa2                 | cpuid               
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   895c2424             | mov                 dword ptr [esp + 0x24], ebx
            //   894c2428             | mov                 dword ptr [esp + 0x28], ecx

        $sequence_6 = { 0f85d2000000 ff15???????? 83f87a 0f85c3000000 8b457f }
            // n = 5, score = 800
            //   0f85d2000000         | jne                 0xd8
            //   ff15????????         |                     
            //   83f87a               | cmp                 eax, 0x7a
            //   0f85c3000000         | jne                 0xc9
            //   8b457f               | mov                 eax, dword ptr [ebp + 0x7f]

        $sequence_7 = { ffd0 ff15???????? 25ffffff00 0fbae81b }
            // n = 4, score = 800
            //   ffd0                 | call                eax
            //   ff15????????         |                     
            //   25ffffff00           | and                 eax, 0xffffff
            //   0fbae81b             | bts                 eax, 0x1b

        $sequence_8 = { 7709 5f 8bce 5e e9???????? }
            // n = 5, score = 200
            //   7709                 | ja                  0xb
            //   5f                   | pop                 edi
            //   8bce                 | mov                 ecx, esi
            //   5e                   | pop                 esi
            //   e9????????           |                     

        $sequence_9 = { 8bc6 5e 5b c3 0fb702 53 }
            // n = 6, score = 200
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   0fb702               | movzx               eax, word ptr [edx]
            //   53                   | push                ebx

        $sequence_10 = { 33c9 0fa2 894500 33c0 895d04 40 894d08 }
            // n = 7, score = 200
            //   33c9                 | xor                 ecx, ecx
            //   0fa2                 | cpuid               
            //   894500               | mov                 dword ptr [ebp], eax
            //   33c0                 | xor                 eax, eax
            //   895d04               | mov                 dword ptr [ebp + 4], ebx
            //   40                   | inc                 eax
            //   894d08               | mov                 dword ptr [ebp + 8], ecx

        $sequence_11 = { 0f31 2bc6 1b542424 03e8 13da 895c2410 ff542420 }
            // n = 7, score = 200
            //   0f31                 | rdtsc               
            //   2bc6                 | sub                 eax, esi
            //   1b542424             | sbb                 edx, dword ptr [esp + 0x24]
            //   03e8                 | add                 ebp, eax
            //   13da                 | adc                 ebx, edx
            //   895c2410             | mov                 dword ptr [esp + 0x10], ebx
            //   ff542420             | call                dword ptr [esp + 0x20]

        $sequence_12 = { 56 57 8d442410 bf00010000 }
            // n = 4, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   bf00010000           | mov                 edi, 0x100

        $sequence_13 = { 55 68???????? 8d047b 50 ffd6 ff742448 03f8 }
            // n = 7, score = 200
            //   55                   | push                ebp
            //   68????????           |                     
            //   8d047b               | lea                 eax, [ebx + edi*2]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   ff742448             | push                dword ptr [esp + 0x48]
            //   03f8                 | add                 edi, eax

        $sequence_14 = { 833b00 0f8580000000 8364242000 8d4c2410 }
            // n = 4, score = 200
            //   833b00               | cmp                 dword ptr [ebx], 0
            //   0f8580000000         | jne                 0x86
            //   8364242000           | and                 dword ptr [esp + 0x20], 0
            //   8d4c2410             | lea                 ecx, [esp + 0x10]

    condition:
        7 of them and filesize < 98304
}