rule win_photoloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = 1100
            //   c0c003               | rol                 al, 3
            //   0fb6c8               | movzx               ecx, al
            //   8bc1                 | mov                 eax, ecx
            //   83e10f               | and                 ecx, 0xf

        $sequence_1 = { ff15???????? 85c0 744c 0fb64301 }
            // n = 4, score = 900
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   744c                 | je                  0x4e
            //   0fb64301             | movzx               eax, byte ptr [ebx + 1]

        $sequence_2 = { 0fa2 894704 33c9 b800000040 0fa2 895f0c e8???????? }
            // n = 7, score = 900
            //   0fa2                 | cpuid               
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   33c9                 | xor                 ecx, ecx
            //   b800000040           | mov                 eax, 0x40000000
            //   0fa2                 | cpuid               
            //   895f0c               | mov                 dword ptr [edi + 0xc], ebx
            //   e8????????           |                     

        $sequence_3 = { 33c9 b801000000 0fa2 89442420 895c2424 894c2428 8954242c }
            // n = 7, score = 900
            //   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
            //   8954242c             | mov                 dword ptr [esp + 0x2c], edx

        $sequence_4 = { 33ff 8bf7 8d6f10 ff15???????? }
            // n = 4, score = 900
            //   33ff                 | xor                 edi, edi
            //   8bf7                 | mov                 esi, edi
            //   8d6f10               | lea                 ebp, [edi + 0x10]
            //   ff15????????         |                     

        $sequence_5 = { ff15???????? 85c0 0f85d2000000 ff15???????? 83f87a 0f85c3000000 8b457f }
            // n = 7, score = 900
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85d2000000         | jne                 0xd8
            //   ff15????????         |                     
            //   83f87a               | cmp                 eax, 0x7a
            //   0f85c3000000         | jne                 0xc9
            //   8b457f               | mov                 eax, dword ptr [ebp + 0x7f]

        $sequence_6 = { f7411400000020 7407 8b41f8 3901 7714 }
            // n = 5, score = 900
            //   f7411400000020       | test                dword ptr [ecx + 0x14], 0x20000000
            //   7407                 | je                  9
            //   8b41f8               | mov                 eax, dword ptr [ecx - 8]
            //   3901                 | cmp                 dword ptr [ecx], eax
            //   7714                 | ja                  0x16

        $sequence_7 = { 0f85c3000000 8b457f 85c0 0f84b8000000 8bd8 ff15???????? }
            // n = 6, score = 900
            //   0f85c3000000         | jne                 0xc9
            //   8b457f               | mov                 eax, dword ptr [ebp + 0x7f]
            //   85c0                 | test                eax, eax
            //   0f84b8000000         | je                  0xbe
            //   8bd8                 | mov                 ebx, eax
            //   ff15????????         |                     

        $sequence_8 = { 50 55 8bda ff15???????? }
            // n = 4, score = 200
            //   50                   | pop                 ecx
            //   55                   | cmp                 word ptr [esp + 0x14], cx
            //   8bda                 | push                eax
            //   ff15????????         |                     

        $sequence_9 = { 51 ffd0 33c0 6a09 59 66394c2414 }
            // n = 6, score = 200
            //   51                   | mov                 eax, ecx
            //   ffd0                 | and                 ecx, 0xf
            //   33c0                 | push                ecx
            //   6a09                 | call                eax
            //   59                   | xor                 eax, eax
            //   66394c2414           | push                9

        $sequence_10 = { 8d7c2414 03f0 6a09 58 }
            // n = 4, score = 200
            //   8d7c2414             | test                bl, bl
            //   03f0                 | je                  0x21
            //   6a09                 | lea                 edi, [esp + 0x14]
            //   58                   | add                 esi, eax

        $sequence_11 = { 8bc3 8b7608 2bf7 fec3 0fb6db }
            // n = 5, score = 200
            //   8bc3                 | test                eax, eax
            //   8b7608               | je                  0xd0
            //   2bf7                 | mov                 eax, ebx
            //   fec3                 | mov                 esi, dword ptr [esi + 8]
            //   0fb6db               | sub                 esi, edi

        $sequence_12 = { ffd6 03f8 83c420 8d0c7b e8???????? 03f8 8d0c7b }
            // n = 7, score = 200
            //   ffd6                 | inc                 bl
            //   03f8                 | movzx               ebx, bl
            //   83c420               | call                esi
            //   8d0c7b               | add                 edi, eax
            //   e8????????           |                     
            //   03f8                 | add                 esp, 0x20
            //   8d0c7b               | lea                 ecx, [ebx + edi*2]

        $sequence_13 = { 68???????? ff15???????? 50 ff15???????? 8bf8 85ff 7445 }
            // n = 7, score = 200
            //   68????????           |                     
            //   ff15????????         |                     
            //   50                   | add                 edi, eax
            //   ff15????????         |                     
            //   8bf8                 | lea                 ecx, [ebx + edi*2]
            //   85ff                 | push                eax
            //   7445                 | mov                 edi, eax

        $sequence_14 = { 7423 8b55f4 85d2 741c 84db 741f }
            // n = 6, score = 200
            //   7423                 | test                edi, edi
            //   8b55f4               | je                  0x47
            //   85d2                 | je                  0x25
            //   741c                 | mov                 edx, dword ptr [ebp - 0xc]
            //   84db                 | test                edx, edx
            //   741f                 | je                  0x1e

    condition:
        7 of them and filesize < 98304
}