rule win_darkcloud_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.darkcloud."
        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.darkcloud"
        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 = { 50 51 c78504ffffff11600000 e8???????? 8bd0 8d4de8 ffd6 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   51                   | push                ecx
            //   c78504ffffff11600000     | mov    dword ptr [ebp - 0xfc], 0x6011
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   ffd6                 | call                esi

        $sequence_1 = { 8d8d44ffffff 50 51 c7850cffffff408f4000 c78504ffffff08000000 ff15???????? 50 }
            // n = 7, score = 100
            //   8d8d44ffffff         | lea                 ecx, [ebp - 0xbc]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   c7850cffffff408f4000     | mov    dword ptr [ebp - 0xf4], 0x408f40
            //   c78504ffffff08000000     | mov    dword ptr [ebp - 0xfc], 8
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_2 = { 68???????? 8b4dbc 51 ff15???????? c745fc4f000000 8b550c 8995e8feffff }
            // n = 7, score = 100
            //   68????????           |                     
            //   8b4dbc               | mov                 ecx, dword ptr [ebp - 0x44]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   c745fc4f000000       | mov                 dword ptr [ebp - 4], 0x4f
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   8995e8feffff         | mov                 dword ptr [ebp - 0x118], edx

        $sequence_3 = { 8975ac 89759c 89758c 89b578ffffff e8???????? 8b0b 8d45bc }
            // n = 7, score = 100
            //   8975ac               | mov                 dword ptr [ebp - 0x54], esi
            //   89759c               | mov                 dword ptr [ebp - 0x64], esi
            //   89758c               | mov                 dword ptr [ebp - 0x74], esi
            //   89b578ffffff         | mov                 dword ptr [ebp - 0x88], esi
            //   e8????????           |                     
            //   8b0b                 | mov                 ecx, dword ptr [ebx]
            //   8d45bc               | lea                 eax, [ebp - 0x44]

        $sequence_4 = { 52 50 ff15???????? 8b8558ffffff 8d9554ffffff 52 6a01 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b8558ffffff         | mov                 eax, dword ptr [ebp - 0xa8]
            //   8d9554ffffff         | lea                 edx, [ebp - 0xac]
            //   52                   | push                edx
            //   6a01                 | push                1

        $sequence_5 = { 6a10 8d4594 50 ff15???????? 8bd0 }
            // n = 5, score = 100
            //   6a10                 | push                0x10
            //   8d4594               | lea                 eax, [ebp - 0x6c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bd0                 | mov                 edx, eax

        $sequence_6 = { ff15???????? c785d8fdffff00000000 83bdd8fdffff12 730c c785e4fcffff00000000 eb0c ff15???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   c785d8fdffff00000000     | mov    dword ptr [ebp - 0x228], 0
            //   83bdd8fdffff12       | cmp                 dword ptr [ebp - 0x228], 0x12
            //   730c                 | jae                 0xe
            //   c785e4fcffff00000000     | mov    dword ptr [ebp - 0x31c], 0
            //   eb0c                 | jmp                 0xe
            //   ff15????????         |                     

        $sequence_7 = { 898578fdffff 8d4590 50 8d8d50ffffff 51 8d5580 52 }
            // n = 7, score = 100
            //   898578fdffff         | mov                 dword ptr [ebp - 0x288], eax
            //   8d4590               | lea                 eax, [ebp - 0x70]
            //   50                   | push                eax
            //   8d8d50ffffff         | lea                 ecx, [ebp - 0xb0]
            //   51                   | push                ecx
            //   8d5580               | lea                 edx, [ebp - 0x80]
            //   52                   | push                edx

        $sequence_8 = { 52 89850cffffff ffd3 33d2 8d8d7cffffff ff15???????? 8b85c8feffff }
            // n = 7, score = 100
            //   52                   | push                edx
            //   89850cffffff         | mov                 dword ptr [ebp - 0xf4], eax
            //   ffd3                 | call                ebx
            //   33d2                 | xor                 edx, edx
            //   8d8d7cffffff         | lea                 ecx, [ebp - 0x84]
            //   ff15????????         |                     
            //   8b85c8feffff         | mov                 eax, dword ptr [ebp - 0x138]

        $sequence_9 = { 89410c 8b95d4fdffff 8d4d8c ff15???????? 50 8b8d84feffff }
            // n = 6, score = 100
            //   89410c               | mov                 dword ptr [ecx + 0xc], eax
            //   8b95d4fdffff         | mov                 edx, dword ptr [ebp - 0x22c]
            //   8d4d8c               | lea                 ecx, [ebp - 0x74]
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8b8d84feffff         | mov                 ecx, dword ptr [ebp - 0x17c]

    condition:
        7 of them and filesize < 622592
}