rule win_phobos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.phobos."
        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.phobos"
        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 = { 59 ff7508 e8???????? 8b442428 59 }
            // n = 5, score = 100
            //   59                   | pop                 ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   59                   | pop                 ecx

        $sequence_1 = { 8bec 83e4f8 81ec44010000 83242400 53 56 8b35???????? }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   83e4f8               | and                 esp, 0xfffffff8
            //   81ec44010000         | sub                 esp, 0x144
            //   83242400             | and                 dword ptr [esp], 0
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b35????????         |                     

        $sequence_2 = { 83c41c 8bfb 85db 742a 46 }
            // n = 5, score = 100
            //   83c41c               | add                 esp, 0x1c
            //   8bfb                 | mov                 edi, ebx
            //   85db                 | test                ebx, ebx
            //   742a                 | je                  0x2c
            //   46                   | inc                 esi

        $sequence_3 = { bf80000000 57 53 8d45fc 50 56 6a00 }
            // n = 7, score = 100
            //   bf80000000           | mov                 edi, 0x80
            //   57                   | push                edi
            //   53                   | push                ebx
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   56                   | push                esi
            //   6a00                 | push                0

        $sequence_4 = { 8b5df0 c1eb08 23d8 0fb69bd0c54000 c1e208 33d3 8b5d08 }
            // n = 7, score = 100
            //   8b5df0               | mov                 ebx, dword ptr [ebp - 0x10]
            //   c1eb08               | shr                 ebx, 8
            //   23d8                 | and                 ebx, eax
            //   0fb69bd0c54000       | movzx               ebx, byte ptr [ebx + 0x40c5d0]
            //   c1e208               | shl                 edx, 8
            //   33d3                 | xor                 edx, ebx
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]

        $sequence_5 = { 0fb708 43 6685c9 75ea 56 }
            // n = 5, score = 100
            //   0fb708               | movzx               ecx, word ptr [eax]
            //   43                   | inc                 ebx
            //   6685c9               | test                cx, cx
            //   75ea                 | jne                 0xffffffec
            //   56                   | push                esi

        $sequence_6 = { c1eb18 333c9da8a54000 8b5df4 23d8 333c9dd0b14000 }
            // n = 5, score = 100
            //   c1eb18               | shr                 ebx, 0x18
            //   333c9da8a54000       | xor                 edi, dword ptr [ebx*4 + 0x40a5a8]
            //   8b5df4               | mov                 ebx, dword ptr [ebp - 0xc]
            //   23d8                 | and                 ebx, eax
            //   333c9dd0b14000       | xor                 edi, dword ptr [ebx*4 + 0x40b1d0]

        $sequence_7 = { 33c0 895c2434 8d7c2438 ab ab 33c0 8d7c241c }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   895c2434             | mov                 dword ptr [esp + 0x34], ebx
            //   8d7c2438             | lea                 edi, dword ptr [esp + 0x38]
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   33c0                 | xor                 eax, eax
            //   8d7c241c             | lea                 edi, dword ptr [esp + 0x1c]

        $sequence_8 = { 53 53 53 8d442440 50 53 89742448 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d442440             | lea                 eax, dword ptr [esp + 0x40]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   89742448             | mov                 dword ptr [esp + 0x48], esi

        $sequence_9 = { 85c0 0f8484000000 8b45fc eb15 8b45fc }
            // n = 5, score = 100
            //   85c0                 | test                eax, eax
            //   0f8484000000         | je                  0x8a
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   eb15                 | jmp                 0x17
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

    condition:
        7 of them and filesize < 139264
}