rule win_shadowhammer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.shadowhammer"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 57 6a40 8d852cffffff 53 50 }
            // n = 5, score = 100
            //   57                   | push                edi
            //   6a40                 | push                0x40
            //   8d852cffffff         | lea                 eax, [ebp - 0xd4]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_1 = { ff501c 83c40c 5f 8bc6 }
            // n = 4, score = 100
            //   ff501c               | call                dword ptr [eax + 0x1c]
            //   83c40c               | add                 esp, 0xc
            //   5f                   | pop                 edi
            //   8bc6                 | mov                 eax, esi

        $sequence_2 = { 751f 68e47a4000 53 56 e8???????? 83c40c 85c0 }
            // n = 7, score = 100
            //   751f                 | jne                 0x21
            //   68e47a4000           | push                0x407ae4
            //   53                   | push                ebx
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_3 = { 58 6a2d 66894584 58 }
            // n = 4, score = 100
            //   58                   | pop                 eax
            //   6a2d                 | push                0x2d
            //   66894584             | mov                 word ptr [ebp - 0x7c], ax
            //   58                   | pop                 eax

        $sequence_4 = { ab ab ab 66ab aa 8955a0 c745a409da9df3 }
            // n = 7, score = 100
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   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
            //   8955a0               | mov                 dword ptr [ebp - 0x60], edx
            //   c745a409da9df3       | mov                 dword ptr [ebp - 0x5c], 0xf39dda09

        $sequence_5 = { 5d c3 e8???????? c21000 8bff 55 8bec }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   e8????????           |                     
            //   c21000               | ret                 0x10
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_6 = { 8bec 6afe 68e0894000 6840344000 64a100000000 50 83ec08 }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   6afe                 | push                -2
            //   68e0894000           | push                0x4089e0
            //   6840344000           | push                0x403440
            //   64a100000000         | mov                 eax, dword ptr fs:[0]
            //   50                   | push                eax
            //   83ec08               | sub                 esp, 8

        $sequence_7 = { 50 8d843d38fdffff 50 ff561c 8b45ec 83c40c ff4df8 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d843d38fdffff       | lea                 eax, [ebp + edi - 0x2c8]
            //   50                   | push                eax
            //   ff561c               | call                dword ptr [esi + 0x1c]
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   83c40c               | add                 esp, 0xc
            //   ff4df8               | dec                 dword ptr [ebp - 8]

        $sequence_8 = { 33c0 8dbd04ffffff ab 889d08ffffff 8dbd09ffffff ab ab }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   8dbd04ffffff         | lea                 edi, [ebp - 0xfc]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   889d08ffffff         | mov                 byte ptr [ebp - 0xf8], bl
            //   8dbd09ffffff         | lea                 edi, [ebp - 0xf7]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_9 = { 83c702 837dec10 72b5 6a02 8d45f8 50 8d856cffffff }
            // n = 7, score = 100
            //   83c702               | add                 edi, 2
            //   837dec10             | cmp                 dword ptr [ebp - 0x14], 0x10
            //   72b5                 | jb                  0xffffffb7
            //   6a02                 | push                2
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   8d856cffffff         | lea                 eax, [ebp - 0x94]

    condition:
        7 of them and filesize < 49152
}