rule win_darkcloud_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 8d8df0feffff ff15???????? 8d95a0feffff 52 8d85b0feffff 50 6a02 }
            // n = 7, score = 100
            //   8d8df0feffff         | lea                 ecx, [ebp - 0x110]
            //   ff15????????         |                     
            //   8d95a0feffff         | lea                 edx, [ebp - 0x160]
            //   52                   | push                edx
            //   8d85b0feffff         | lea                 eax, [ebp - 0x150]
            //   50                   | push                eax
            //   6a02                 | push                2

        $sequence_1 = { 6a03 ff15???????? 83c410 c745fc33000000 ba???????? 8d8df0feffff ff15???????? }
            // n = 7, score = 100
            //   6a03                 | push                3
            //   ff15????????         |                     
            //   83c410               | add                 esp, 0x10
            //   c745fc33000000       | mov                 dword ptr [ebp - 4], 0x33
            //   ba????????           |                     
            //   8d8df0feffff         | lea                 ecx, [ebp - 0x110]
            //   ff15????????         |                     

        $sequence_2 = { 52 6a02 ff15???????? 83c40c 8d4d80 ff15???????? c745fc1e000000 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   8d4d80               | lea                 ecx, [ebp - 0x80]
            //   ff15????????         |                     
            //   c745fc1e000000       | mov                 dword ptr [ebp - 4], 0x1e

        $sequence_3 = { 52 50 ff15???????? 8d4de0 8d55e8 51 }
            // n = 6, score = 100
            //   52                   | push                edx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   8d55e8               | lea                 edx, [ebp - 0x18]
            //   51                   | push                ecx

        $sequence_4 = { 83e104 85c9 7409 8d4dd0 ff15???????? 8d55bc 52 }
            // n = 7, score = 100
            //   83e104               | and                 ecx, 4
            //   85c9                 | test                ecx, ecx
            //   7409                 | je                  0xb
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]
            //   ff15????????         |                     
            //   8d55bc               | lea                 edx, [ebp - 0x44]
            //   52                   | push                edx

        $sequence_5 = { 730c c78570fdffff00000000 eb0c ff15???????? 898570fdffff 8b95fcfeffff c1e204 }
            // n = 7, score = 100
            //   730c                 | jae                 0xe
            //   c78570fdffff00000000     | mov    dword ptr [ebp - 0x290], 0
            //   eb0c                 | jmp                 0xe
            //   ff15????????         |                     
            //   898570fdffff         | mov                 dword ptr [ebp - 0x290], eax
            //   8b95fcfeffff         | mov                 edx, dword ptr [ebp - 0x104]
            //   c1e204               | shl                 edx, 4

        $sequence_6 = { 50 51 6a02 ff15???????? 83c40c 6639bd5cffffff 741e }
            // n = 7, score = 100
            //   50                   | push                eax
            //   51                   | push                ecx
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   6639bd5cffffff       | cmp                 word ptr [ebp - 0xa4], di
            //   741e                 | je                  0x20

        $sequence_7 = { 8b9564fdffff 8d8decfeffff ff15???????? c785d8fdffff04000000 83bdd8fdffff12 730c c785d4fcffff00000000 }
            // n = 7, score = 100
            //   8b9564fdffff         | mov                 edx, dword ptr [ebp - 0x29c]
            //   8d8decfeffff         | lea                 ecx, [ebp - 0x114]
            //   ff15????????         |                     
            //   c785d8fdffff04000000     | mov    dword ptr [ebp - 0x228], 4
            //   83bdd8fdffff12       | cmp                 dword ptr [ebp - 0x228], 0x12
            //   730c                 | jae                 0xe
            //   c785d4fcffff00000000     | mov    dword ptr [ebp - 0x32c], 0

        $sequence_8 = { eb0c ff15???????? 8985f8fdffff 8b8df0feffff 8b957cffffff 8d048a 898504ffffff }
            // n = 7, score = 100
            //   eb0c                 | jmp                 0xe
            //   ff15????????         |                     
            //   8985f8fdffff         | mov                 dword ptr [ebp - 0x208], eax
            //   8b8df0feffff         | mov                 ecx, dword ptr [ebp - 0x110]
            //   8b957cffffff         | mov                 edx, dword ptr [ebp - 0x84]
            //   8d048a               | lea                 eax, [edx + ecx*4]
            //   898504ffffff         | mov                 dword ptr [ebp - 0xfc], eax

        $sequence_9 = { e8???????? 8bd0 8d4ddc ff15???????? c745fc10000000 8b4d94 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]
            //   ff15????????         |                     
            //   c745fc10000000       | mov                 dword ptr [ebp - 4], 0x10
            //   8b4d94               | mov                 ecx, dword ptr [ebp - 0x6c]

    condition:
        7 of them and filesize < 622592
}