rule win_phobos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { e8???????? e8???????? eb1b 6a10 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   e8????????           |                     
            //   eb1b                 | jmp                 0x1d
            //   6a10                 | push                0x10

        $sequence_1 = { 89460c 0fbf4604 3bf8 7e18 8bcf 2bc8 03c9 }
            // n = 7, score = 100
            //   89460c               | mov                 dword ptr [esi + 0xc], eax
            //   0fbf4604             | movsx               eax, word ptr [esi + 4]
            //   3bf8                 | cmp                 edi, eax
            //   7e18                 | jle                 0x1a
            //   8bcf                 | mov                 ecx, edi
            //   2bc8                 | sub                 ecx, eax
            //   03c9                 | add                 ecx, ecx

        $sequence_2 = { ff36 ff15???????? 8bd8 f7db }
            // n = 4, score = 100
            //   ff36                 | push                dword ptr [esi]
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   f7db                 | neg                 ebx

        $sequence_3 = { e8???????? 83c40c 8bc7 5f ebd2 55 8bec }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   ebd2                 | jmp                 0xffffffd4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_4 = { 53 56 57 8bf8 7505 e8???????? be???????? }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf8                 | mov                 edi, eax
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   be????????           |                     

        $sequence_5 = { 0fb692a8a44000 23ce 0fb689a8a44000 c1e108 33ca 0fb6501e }
            // n = 6, score = 100
            //   0fb692a8a44000       | movzx               edx, byte ptr [edx + 0x40a4a8]
            //   23ce                 | and                 ecx, esi
            //   0fb689a8a44000       | movzx               ecx, byte ptr [ecx + 0x40a4a8]
            //   c1e108               | shl                 ecx, 8
            //   33ca                 | xor                 ecx, edx
            //   0fb6501e             | movzx               edx, byte ptr [eax + 0x1e]

        $sequence_6 = { 51 53 56 8bf0 8b4508 33db 57 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8bf0                 | mov                 esi, eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   33db                 | xor                 ebx, ebx
            //   57                   | push                edi

        $sequence_7 = { ff75fc ff7508 e8???????? 59 59 eb01 4f }
            // n = 7, score = 100
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   eb01                 | jmp                 3
            //   4f                   | dec                 edi

        $sequence_8 = { 85ff 7438 0fb70f 8bc7 eb11 83c002 }
            // n = 6, score = 100
            //   85ff                 | test                edi, edi
            //   7438                 | je                  0x3a
            //   0fb70f               | movzx               ecx, word ptr [edi]
            //   8bc7                 | mov                 eax, edi
            //   eb11                 | jmp                 0x13
            //   83c002               | add                 eax, 2

        $sequence_9 = { e8???????? 8bf0 33db 59 3bf3 0f84ab000000 68a00f0000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   33db                 | xor                 ebx, ebx
            //   59                   | pop                 ecx
            //   3bf3                 | cmp                 esi, ebx
            //   0f84ab000000         | je                  0xb1
            //   68a00f0000           | push                0xfa0

    condition:
        7 of them and filesize < 139264
}