rule win_cryptoshield_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.cryptoshield."
        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.cryptoshield"
        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 = { 83f801 7516 be06000000 8bc6 5e 8b4dfc }
            // n = 6, score = 300
            //   83f801               | cmp                 eax, 1
            //   7516                 | jne                 0x18
            //   be06000000           | mov                 esi, 6
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_1 = { 50 8d85f4fdffff 50 c785f0fdffff05010000 ff15???????? 85c0 7513 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   8d85f4fdffff         | lea                 eax, [ebp - 0x20c]
            //   50                   | push                eax
            //   c785f0fdffff05010000     | mov    dword ptr [ebp - 0x210], 0x105
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7513                 | jne                 0x15

        $sequence_2 = { ffd7 8b1d???????? 6804010000 8d85ecfbffff }
            // n = 4, score = 300
            //   ffd7                 | call                edi
            //   8b1d????????         |                     
            //   6804010000           | push                0x104
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]

        $sequence_3 = { 8d85c4f1ffff 68???????? 50 ffd3 }
            // n = 4, score = 300
            //   8d85c4f1ffff         | lea                 eax, [ebp - 0xe3c]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd3                 | call                ebx

        $sequence_4 = { 6a19 ff75fc ff15???????? 85c0 7508 ffd3 8bf8 }
            // n = 7, score = 300
            //   6a19                 | push                0x19
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7508                 | jne                 0xa
            //   ffd3                 | call                ebx
            //   8bf8                 | mov                 edi, eax

        $sequence_5 = { 50 ff15???????? 83c40c 8d85ecfbffff 6a00 6880000000 6a04 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   6a00                 | push                0
            //   6880000000           | push                0x80
            //   6a04                 | push                4

        $sequence_6 = { 8d95f4fdffff 6685c9 7417 0fb7c9 90 }
            // n = 5, score = 300
            //   8d95f4fdffff         | lea                 edx, [ebp - 0x20c]
            //   6685c9               | test                cx, cx
            //   7417                 | je                  0x19
            //   0fb7c9               | movzx               ecx, cx
            //   90                   | nop                 

        $sequence_7 = { 50 ffd3 83f8ff 7505 50 ffd6 }
            // n = 6, score = 300
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   83f8ff               | cmp                 eax, -1
            //   7505                 | jne                 7
            //   50                   | push                eax
            //   ffd6                 | call                esi

        $sequence_8 = { 83feff 7466 6804010000 8d85f8feffff 6a00 50 }
            // n = 6, score = 300
            //   83feff               | cmp                 esi, -1
            //   7466                 | je                  0x68
            //   6804010000           | push                0x104
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_9 = { 8b8c243c060000 5f 5e 5b }
            // n = 4, score = 300
            //   8b8c243c060000       | mov                 ecx, dword ptr [esp + 0x63c]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

    condition:
        7 of them and filesize < 131072
}