rule win_deltas_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.deltas."
        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.deltas"
        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 = { 6a00 68???????? 51 c744242418020000 ff15???????? 8b542408 8bf0 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   68????????           |                     
            //   51                   | push                ecx
            //   c744242418020000     | mov                 dword ptr [esp + 0x24], 0x218
            //   ff15????????         |                     
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8bf0                 | mov                 esi, eax

        $sequence_1 = { 03d8 85ff 7fa3 8b442424 }
            // n = 4, score = 200
            //   03d8                 | add                 ebx, eax
            //   85ff                 | test                edi, edi
            //   7fa3                 | jg                  0xffffffa5
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]

        $sequence_2 = { 83e103 8b549608 c1e103 d3ea }
            // n = 4, score = 200
            //   83e103               | and                 ecx, 3
            //   8b549608             | mov                 edx, dword ptr [esi + edx*4 + 8]
            //   c1e103               | shl                 ecx, 3
            //   d3ea                 | shr                 edx, cl

        $sequence_3 = { 8b8870040000 52 8b9084040000 51 8b8878040000 52 }
            // n = 6, score = 200
            //   8b8870040000         | mov                 ecx, dword ptr [eax + 0x470]
            //   52                   | push                edx
            //   8b9084040000         | mov                 edx, dword ptr [eax + 0x484]
            //   51                   | push                ecx
            //   8b8878040000         | mov                 ecx, dword ptr [eax + 0x478]
            //   52                   | push                edx

        $sequence_4 = { 747f 8d542418 52 ff15???????? 85c0 89442410 7405 }
            // n = 7, score = 200
            //   747f                 | je                  0x81
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   7405                 | je                  7

        $sequence_5 = { 8d542420 52 ffd7 8bf0 85f6 }
            // n = 5, score = 200
            //   8d542420             | lea                 edx, [esp + 0x20]
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi

        $sequence_6 = { 03f3 8d8c0e91d386eb 8bb42498000000 8b5e08 }
            // n = 4, score = 200
            //   03f3                 | add                 esi, ebx
            //   8d8c0e91d386eb       | lea                 ecx, [esi + ecx - 0x14792c6f]
            //   8bb42498000000       | mov                 esi, dword ptr [esp + 0x98]
            //   8b5e08               | mov                 ebx, dword ptr [esi + 8]

        $sequence_7 = { a1???????? 5f 85c0 0f8402010000 a1???????? }
            // n = 5, score = 200
            //   a1????????           |                     
            //   5f                   | pop                 edi
            //   85c0                 | test                eax, eax
            //   0f8402010000         | je                  0x108
            //   a1????????           |                     

        $sequence_8 = { 687e660480 52 c744241400000000 ff15???????? }
            // n = 4, score = 200
            //   687e660480           | push                0x8004667e
            //   52                   | push                edx
            //   c744241400000000     | mov                 dword ptr [esp + 0x14], 0
            //   ff15????????         |                     

        $sequence_9 = { 750e 8d4c2464 51 ffd6 898424c0000000 8d9424b0000000 52 }
            // n = 7, score = 200
            //   750e                 | jne                 0x10
            //   8d4c2464             | lea                 ecx, [esp + 0x64]
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   898424c0000000       | mov                 dword ptr [esp + 0xc0], eax
            //   8d9424b0000000       | lea                 edx, [esp + 0xb0]
            //   52                   | push                edx

    condition:
        7 of them and filesize < 90112
}

rule win_deltas_w0 {
	meta:
		author = "Novetta Threat Research & Interdiction Group - trig@novetta.com"
		copyright = "2015 Novetta Solutions"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/DeltaCharlie.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.deltas"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

	strings:
		$rsaKey = {7B 4E 1E A7 E9 3F 36 4C DE F4 F0 99 C4 D9 B7 94 
		           A1 FF F2 97 D3 91 13 9D C0 12 02 E4 4C BB 6C 77 
		           48 EE 6F 4B 9B 53 60 98 45 A5 28 65 8A 0B F8 39 
		           73 D7 1A 44 13 B3 6A BB 61 44 AF 31 47 E7 87 C2 
		           AE 7A A7 2C 3A D9 5C 2E 42 1A A6 78 FE 2C AD ED 
		           39 3F FA D0 AD 3D D9 C5 3D 28 EF 3D 67 B1 E0 68 
		           3F 58 A0 19 27 CC 27 C9 E8 D8 1E 7E EE 91 DD 13 
		           B3 47 EF 57 1A CA FF 9A 60 E0 64 08 AA E2 92 D0}
		           
	condition:
		any of them
}