rule win_phobos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "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 = { 6aff ff7704 ff15???????? ff742418 ffd6 ff742410 e8???????? }
            // n = 7, score = 100
            //   6aff                 | push                -1
            //   ff7704               | push                dword ptr [edi + 4]
            //   ff15????????         |                     
            //   ff742418             | push                dword ptr [esp + 0x18]
            //   ffd6                 | call                esi
            //   ff742410             | push                dword ptr [esp + 0x10]
            //   e8????????           |                     

        $sequence_1 = { 8b0e 2bd0 52 8bd0 2bc1 2b4614 2bd1 }
            // n = 7, score = 100
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   2bd0                 | sub                 edx, eax
            //   52                   | push                edx
            //   8bd0                 | mov                 edx, eax
            //   2bc1                 | sub                 eax, ecx
            //   2b4614               | sub                 eax, dword ptr [esi + 0x14]
            //   2bd1                 | sub                 edx, ecx

        $sequence_2 = { 85c0 7405 83c002 5d c3 8b4508 5d }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7
            //   83c002               | add                 eax, 2
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   5d                   | pop                 ebp

        $sequence_3 = { 8b7df8 eb1b 0fb707 6685c0 7418 e8???????? 663bd0 }
            // n = 7, score = 100
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]
            //   eb1b                 | jmp                 0x1d
            //   0fb707               | movzx               eax, word ptr [edi]
            //   6685c0               | test                ax, ax
            //   7418                 | je                  0x1a
            //   e8????????           |                     
            //   663bd0               | cmp                 dx, ax

        $sequence_4 = { 8d4701 99 2bc2 d1f8 8bd9 e8???????? 8bf0 }
            // n = 7, score = 100
            //   8d4701               | lea                 eax, dword ptr [edi + 1]
            //   99                   | cdq                 
            //   2bc2                 | sub                 eax, edx
            //   d1f8                 | sar                 eax, 1
            //   8bd9                 | mov                 ebx, ecx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_5 = { 743f 8d855cfdffff 8d8d4cfbffff e8???????? 85c0 8b45e8 7409 }
            // n = 7, score = 100
            //   743f                 | je                  0x41
            //   8d855cfdffff         | lea                 eax, dword ptr [ebp - 0x2a4]
            //   8d8d4cfbffff         | lea                 ecx, dword ptr [ebp - 0x4b4]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   7409                 | je                  0xb

        $sequence_6 = { 74ee 8b36 53 ff15???????? 5f 8bc6 5e }
            // n = 7, score = 100
            //   74ee                 | je                  0xfffffff0
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi

        $sequence_7 = { eb37 33ff eb33 8b06 }
            // n = 4, score = 100
            //   eb37                 | jmp                 0x39
            //   33ff                 | xor                 edi, edi
            //   eb33                 | jmp                 0x35
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_8 = { 8bf0 8d45f4 8945e8 8b450c 8d5df4 c745e464934000 897dec }
            // n = 7, score = 100
            //   8bf0                 | mov                 esi, eax
            //   8d45f4               | lea                 eax, dword ptr [ebp - 0xc]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8d5df4               | lea                 ebx, dword ptr [ebp - 0xc]
            //   c745e464934000       | mov                 dword ptr [ebp - 0x1c], 0x409364
            //   897dec               | mov                 dword ptr [ebp - 0x14], edi

        $sequence_9 = { 7409 c7450c0a000000 eb36 8a06 3c78 740d 3c58 }
            // n = 7, score = 100
            //   7409                 | je                  0xb
            //   c7450c0a000000       | mov                 dword ptr [ebp + 0xc], 0xa
            //   eb36                 | jmp                 0x38
            //   8a06                 | mov                 al, byte ptr [esi]
            //   3c78                 | cmp                 al, 0x78
            //   740d                 | je                  0xf
            //   3c58                 | cmp                 al, 0x58

    condition:
        7 of them and filesize < 139264
}