rule win_dharma_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.dharma."
        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.dharma"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8b450c 0345fc 0fb600 8b4df0 c1e103 d3e0 8b4df4 }
            // n = 7, score = 100
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   0345fc               | add                 eax, dword ptr [ebp - 4]
            //   0fb600               | movzx               eax, byte ptr [eax]
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   c1e103               | shl                 ecx, 3
            //   d3e0                 | shl                 eax, cl
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_1 = { 8b4508 8b4814 8b11 52 e8???????? }
            // n = 5, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4814               | mov                 ecx, dword ptr [eax + 0x14]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_2 = { 81e10000ff00 33c1 8b55f8 81e2ff000000 8b0c95b8b34000 81e100ff0000 33c1 }
            // n = 7, score = 100
            //   81e10000ff00         | and                 ecx, 0xff0000
            //   33c1                 | xor                 eax, ecx
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   81e2ff000000         | and                 edx, 0xff
            //   8b0c95b8b34000       | mov                 ecx, dword ptr [edx*4 + 0x40b3b8]
            //   81e100ff0000         | and                 ecx, 0xff00
            //   33c1                 | xor                 eax, ecx

        $sequence_3 = { 83c8ff e9???????? 0fb64d14 8b4510 33d2 f7f1 8b45f4 }
            // n = 7, score = 100
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   0fb64d14             | movzx               ecx, byte ptr [ebp + 0x14]
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   33d2                 | xor                 edx, edx
            //   f7f1                 | div                 ecx
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_4 = { 8b45fc 8945d8 33c9 66894dc8 8d55e8 }
            // n = 5, score = 100
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   33c9                 | xor                 ecx, ecx
            //   66894dc8             | mov                 word ptr [ebp - 0x38], cx
            //   8d55e8               | lea                 edx, [ebp - 0x18]

        $sequence_5 = { 8b4dfc 8b1488 52 e8???????? 85c0 7505 }
            // n = 6, score = 100
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b1488               | mov                 edx, dword ptr [eax + ecx*4]
            //   52                   | push                edx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7

        $sequence_6 = { 6a00 8b4d08 8b5110 52 e8???????? 83c408 8b4508 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b5110               | mov                 edx, dword ptr [ecx + 0x10]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_7 = { 50 6a00 8b55bc 52 e8???????? 83c40c 8b45bc }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6a00                 | push                0
            //   8b55bc               | mov                 edx, dword ptr [ebp - 0x44]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b45bc               | mov                 eax, dword ptr [ebp - 0x44]

        $sequence_8 = { 83c408 8945f8 6a00 8b4dfc 51 e8???????? }
            // n = 6, score = 100
            //   83c408               | add                 esp, 8
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   6a00                 | push                0
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_9 = { 8945f4 8b45f0 50 e8???????? 8b4df8 51 }
            // n = 6, score = 100
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 204800
}