rule win_shadowhammer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.shadowhammer."
        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.shadowhammer"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { c7853cffffffc9d42289 c78540ffffff30bc1403 c78544ffffff1212cb9a c78548ffffff7c1bb287 }
            // n = 4, score = 100
            //   c7853cffffffc9d42289     | mov    dword ptr [ebp - 0xc4], 0x8922d4c9
            //   c78540ffffff30bc1403     | mov    dword ptr [ebp - 0xc0], 0x314bc30
            //   c78544ffffff1212cb9a     | mov    dword ptr [ebp - 0xbc], 0x9acb1212
            //   c78548ffffff7c1bb287     | mov    dword ptr [ebp - 0xb8], 0x87b21b7c

        $sequence_1 = { 5d c3 8b04c5dc794000 5d c3 8bff 55 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b04c5dc794000       | mov                 eax, dword ptr [eax*8 + 0x4079dc]
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp

        $sequence_2 = { 6a0c 8d45dc 53 50 ff5624 8b4508 }
            // n = 6, score = 100
            //   6a0c                 | push                0xc
            //   8d45dc               | lea                 eax, dword ptr [ebp - 0x24]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ff5624               | call                dword ptr [esi + 0x24]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_3 = { 50 7608 ff562c 8d45e2 eb06 ff562c }
            // n = 6, score = 100
            //   50                   | push                eax
            //   7608                 | jbe                 0xa
            //   ff562c               | call                dword ptr [esi + 0x2c]
            //   8d45e2               | lea                 eax, dword ptr [ebp - 0x1e]
            //   eb06                 | jmp                 8
            //   ff562c               | call                dword ptr [esi + 0x2c]

        $sequence_4 = { 682c714000 50 ff15???????? 85c0 }
            // n = 4, score = 100
            //   682c714000           | push                0x40712c
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_5 = { a1???????? c705????????482f4000 8935???????? a3???????? ff15???????? a3???????? }
            // n = 6, score = 100
            //   a1????????           |                     
            //   c705????????482f4000     |     
            //   8935????????         |                     
            //   a3????????           |                     
            //   ff15????????         |                     
            //   a3????????           |                     

        $sequence_6 = { ab ab 66ab aa 33c0 8dbd5cffffff 899548ffffff }
            // n = 7, score = 100
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   33c0                 | xor                 eax, eax
            //   8dbd5cffffff         | lea                 edi, dword ptr [ebp - 0xa4]
            //   899548ffffff         | mov                 dword ptr [ebp - 0xb8], edx

        $sequence_7 = { 8bdf 6a45 66895d9e 5b 6a25 }
            // n = 5, score = 100
            //   8bdf                 | mov                 ebx, edi
            //   6a45                 | push                0x45
            //   66895d9e             | mov                 word ptr [ebp - 0x62], bx
            //   5b                   | pop                 ebx
            //   6a25                 | push                0x25

        $sequence_8 = { ffd7 50 ffd6 684c7c4000 53 a3???????? }
            // n = 6, score = 100
            //   ffd7                 | call                edi
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   684c7c4000           | push                0x407c4c
            //   53                   | push                ebx
            //   a3????????           |                     

        $sequence_9 = { c78550ffffff470e9864 c78554ffffffd19e48cb c78558ffffff360caf64 ab c78560fffffffb559bcd c78564ffffff103ee0fc c78568ffffffb0cf4161 }
            // n = 7, score = 100
            //   c78550ffffff470e9864     | mov    dword ptr [ebp - 0xb0], 0x64980e47
            //   c78554ffffffd19e48cb     | mov    dword ptr [ebp - 0xac], 0xcb489ed1
            //   c78558ffffff360caf64     | mov    dword ptr [ebp - 0xa8], 0x64af0c36
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   c78560fffffffb559bcd     | mov    dword ptr [ebp - 0xa0], 0xcd9b55fb
            //   c78564ffffff103ee0fc     | mov    dword ptr [ebp - 0x9c], 0xfce03e10
            //   c78568ffffffb0cf4161     | mov    dword ptr [ebp - 0x98], 0x6141cfb0

    condition:
        7 of them and filesize < 49152
}