rule win_daserf_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.daserf."
        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.daserf"
        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 = { 7500 2d154962a4 95 89ac2430f2ffff 8be8 8b842430f2ffff }
            // n = 6, score = 100
            //   7500                 | jne                 2
            //   2d154962a4           | sub                 eax, 0xa4624915
            //   95                   | xchg                eax, ebp
            //   89ac2430f2ffff       | mov                 dword ptr [esp - 0xdd0], ebp
            //   8be8                 | mov                 ebp, eax
            //   8b842430f2ffff       | mov                 eax, dword ptr [esp - 0xdd0]

        $sequence_1 = { 81c3d87a3f7e 0586910127 2db7c3ee06 81c39d395c6e }
            // n = 4, score = 100
            //   81c3d87a3f7e         | add                 ebx, 0x7e3f7ad8
            //   0586910127           | add                 eax, 0x27019186
            //   2db7c3ee06           | sub                 eax, 0x6eec3b7
            //   81c39d395c6e         | add                 ebx, 0x6e5c399d

        $sequence_2 = { 7500 0595e368fc 8d36 2dc2dc79d5 7500 81c3eb04d00c }
            // n = 6, score = 100
            //   7500                 | jne                 2
            //   0595e368fc           | add                 eax, 0xfc68e395
            //   8d36                 | lea                 esi, dword ptr [esi]
            //   2dc2dc79d5           | sub                 eax, 0xd579dcc2
            //   7500                 | jne                 2
            //   81c3eb04d00c         | add                 ebx, 0xcd004eb

        $sequence_3 = { 90 81ebf77f1144 87d2 81ebc71c2462 87db 05e5932334 }
            // n = 6, score = 100
            //   90                   | nop                 
            //   81ebf77f1144         | sub                 ebx, 0x44117ff7
            //   87d2                 | xchg                edx, edx
            //   81ebc71c2462         | sub                 ebx, 0x62241cc7
            //   87db                 | xchg                ebx, ebx
            //   05e5932334           | add                 eax, 0x342393e5

        $sequence_4 = { 53 56 57 ff15???????? 3d00000080 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff15????????         |                     
            //   3d00000080           | cmp                 eax, 0x80000000

        $sequence_5 = { 81c388af7ac1 05f1beaa82 2d4f137ccd 81c31d26a495 }
            // n = 4, score = 100
            //   81c388af7ac1         | add                 ebx, 0xc17aaf88
            //   05f1beaa82           | add                 eax, 0x82aabef1
            //   2d4f137ccd           | sub                 eax, 0xcd7c134f
            //   81c31d26a495         | add                 ebx, 0x95a4261d

        $sequence_6 = { 50 50 6800000080 ff74241c ff15???????? c3 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   50                   | push                eax
            //   6800000080           | push                0x80000000
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   ff15????????         |                     
            //   c3                   | ret                 

        $sequence_7 = { 054680354f 2d3e1ec12c 81c388627057 05463631a1 }
            // n = 4, score = 100
            //   054680354f           | add                 eax, 0x4f358046
            //   2d3e1ec12c           | sub                 eax, 0x2cc11e3e
            //   81c388627057         | add                 ebx, 0x57706288
            //   05463631a1           | add                 eax, 0xa1313646

        $sequence_8 = { f7d3 f7d3 81c3829a7887 87d2 81eb1e51eab2 f7d7 f7d7 }
            // n = 7, score = 100
            //   f7d3                 | not                 ebx
            //   f7d3                 | not                 ebx
            //   81c3829a7887         | add                 ebx, 0x87789a82
            //   87d2                 | xchg                edx, edx
            //   81eb1e51eab2         | sub                 ebx, 0xb2ea511e
            //   f7d7                 | not                 edi
            //   f7d7                 | not                 edi

        $sequence_9 = { 81ebdcf287d2 90 81c3a28c0de9 97 89bc2400f5ffff }
            // n = 5, score = 100
            //   81ebdcf287d2         | sub                 ebx, 0xd287f2dc
            //   90                   | nop                 
            //   81c3a28c0de9         | add                 ebx, 0xe90d8ca2
            //   97                   | xchg                eax, edi
            //   89bc2400f5ffff       | mov                 dword ptr [esp - 0xb00], edi

        $sequence_10 = { 81ebec042db6 7500 2d0b2f7aee f7d3 f7d3 81eb01863580 7500 }
            // n = 7, score = 100
            //   81ebec042db6         | sub                 ebx, 0xb62d04ec
            //   7500                 | jne                 2
            //   2d0b2f7aee           | sub                 eax, 0xee7a2f0b
            //   f7d3                 | not                 ebx
            //   f7d3                 | not                 ebx
            //   81eb01863580         | sub                 ebx, 0x80358601
            //   7500                 | jne                 2

        $sequence_11 = { 87f6 05f6dbf42a 7500 81eb4e0e3377 87c0 }
            // n = 5, score = 100
            //   87f6                 | xchg                esi, esi
            //   05f6dbf42a           | add                 eax, 0x2af4dbf6
            //   7500                 | jne                 2
            //   81eb4e0e3377         | sub                 ebx, 0x77330e4e
            //   87c0                 | xchg                eax, eax

        $sequence_12 = { 2d78fe9726 059a220311 81eb2097189c 0570121e35 81eb9b8b4cc9 }
            // n = 5, score = 100
            //   2d78fe9726           | sub                 eax, 0x2697fe78
            //   059a220311           | add                 eax, 0x1103229a
            //   81eb2097189c         | sub                 ebx, 0x9c189720
            //   0570121e35           | add                 eax, 0x351e1270
            //   81eb9b8b4cc9         | sub                 ebx, 0xc94c8b9b

        $sequence_13 = { 81eb8a706645 9b 81c376966f5d 97 89bc2420f3ffff 8bf8 }
            // n = 6, score = 100
            //   81eb8a706645         | sub                 ebx, 0x4566708a
            //   9b                   | wait                
            //   81c376966f5d         | add                 ebx, 0x5d6f9676
            //   97                   | xchg                eax, edi
            //   89bc2420f3ffff       | mov                 dword ptr [esp - 0xce0], edi
            //   8bf8                 | mov                 edi, eax

        $sequence_14 = { 81eb5a639002 81c3b168ba80 81c3f5fcff22 81c3b29fdbe3 }
            // n = 4, score = 100
            //   81eb5a639002         | sub                 ebx, 0x290635a
            //   81c3b168ba80         | add                 ebx, 0x80ba68b1
            //   81c3f5fcff22         | add                 ebx, 0x22fffcf5
            //   81c3b29fdbe3         | add                 ebx, 0xe3db9fb2

        $sequence_15 = { 05871a82f9 81eb5a389faf 2d98958ee3 81ebeeced6d0 }
            // n = 4, score = 100
            //   05871a82f9           | add                 eax, 0xf9821a87
            //   81eb5a389faf         | sub                 ebx, 0xaf9f385a
            //   2d98958ee3           | sub                 eax, 0xe38e9598
            //   81ebeeced6d0         | sub                 ebx, 0xd0d6ceee

    condition:
        7 of them and filesize < 245760
}