rule win_farseer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.farseer."
        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.farseer"
        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 = { 68c7000000 8d44244d 8bea 6a00 50 89742444 896c2448 }
            // n = 7, score = 100
            //   68c7000000           | push                0xc7
            //   8d44244d             | lea                 eax, [esp + 0x4d]
            //   8bea                 | mov                 ebp, edx
            //   6a00                 | push                0
            //   50                   | push                eax
            //   89742444             | mov                 dword ptr [esp + 0x44], esi
            //   896c2448             | mov                 dword ptr [esp + 0x48], ebp

        $sequence_1 = { c1f905 8b0c8d20634200 c1e006 8d44010c 50 ff15???????? }
            // n = 6, score = 100
            //   c1f905               | sar                 ecx, 5
            //   8b0c8d20634200       | mov                 ecx, dword ptr [ecx*4 + 0x426320]
            //   c1e006               | shl                 eax, 6
            //   8d44010c             | lea                 eax, [ecx + eax + 0xc]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_2 = { 0f8450020000 6803010000 8d8c240d090000 6a00 51 c684241409000000 e8???????? }
            // n = 7, score = 100
            //   0f8450020000         | je                  0x256
            //   6803010000           | push                0x103
            //   8d8c240d090000       | lea                 ecx, [esp + 0x90d]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   c684241409000000     | mov                 byte ptr [esp + 0x914], 0
            //   e8????????           |                     

        $sequence_3 = { ff15???????? 6803010000 8d84241d020000 53 50 889c2424020000 e8???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   6803010000           | push                0x103
            //   8d84241d020000       | lea                 eax, [esp + 0x21d]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   889c2424020000       | mov                 byte ptr [esp + 0x224], bl
            //   e8????????           |                     

        $sequence_4 = { 8d4c2478 e8???????? 8d442474 50 8d4c2450 51 c78424a000000002000000 }
            // n = 7, score = 100
            //   8d4c2478             | lea                 ecx, [esp + 0x78]
            //   e8????????           |                     
            //   8d442474             | lea                 eax, [esp + 0x74]
            //   50                   | push                eax
            //   8d4c2450             | lea                 ecx, [esp + 0x50]
            //   51                   | push                ecx
            //   c78424a000000002000000     | mov    dword ptr [esp + 0xa0], 2

        $sequence_5 = { 8bc7 8b4c2470 64890d00000000 59 5e 5d 5b }
            // n = 7, score = 100
            //   8bc7                 | mov                 eax, edi
            //   8b4c2470             | mov                 ecx, dword ptr [esp + 0x70]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx

        $sequence_6 = { 8d14c500000000 83c404 2bd0 a1???????? 8d0c90 890d???????? }
            // n = 6, score = 100
            //   8d14c500000000       | lea                 edx, [eax*8]
            //   83c404               | add                 esp, 4
            //   2bd0                 | sub                 edx, eax
            //   a1????????           |                     
            //   8d0c90               | lea                 ecx, [eax + edx*4]
            //   890d????????         |                     

        $sequence_7 = { 8b5004 c7440af49c064200 8b41fc 8b5004 c7440afc???????? 8b41f4 8b5004 }
            // n = 7, score = 100
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   c7440af49c064200     | mov                 dword ptr [edx + ecx - 0xc], 0x42069c
            //   8b41fc               | mov                 eax, dword ptr [ecx - 4]
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   c7440afc????????     |                     
            //   8b41f4               | mov                 eax, dword ptr [ecx - 0xc]
            //   8b5004               | mov                 edx, dword ptr [eax + 4]

        $sequence_8 = { 68d0070000 ff15???????? 8d8424c4010000 68???????? 50 e8???????? 83c408 }
            // n = 7, score = 100
            //   68d0070000           | push                0x7d0
            //   ff15????????         |                     
            //   8d8424c4010000       | lea                 eax, [esp + 0x1c4]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_9 = { 8d942408090000 52 ffd5 85c0 }
            // n = 4, score = 100
            //   8d942408090000       | lea                 edx, [esp + 0x908]
            //   52                   | push                edx
            //   ffd5                 | call                ebp
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 347328
}