rule win_megumin_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.megumin."
        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.megumin"
        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 = { 8d4dd8 e8???????? 84c0 7555 6a1a b9???????? e8???????? }
            // n = 7, score = 200
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7555                 | jne                 0x57
            //   6a1a                 | push                0x1a
            //   b9????????           |                     
            //   e8????????           |                     

        $sequence_1 = { c645fc11 8d45d4 837de810 0f4345d4 50 51 8d8d98fdffff }
            // n = 7, score = 200
            //   c645fc11             | mov                 byte ptr [ebp - 4], 0x11
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   837de810             | cmp                 dword ptr [ebp - 0x18], 0x10
            //   0f4345d4             | cmovae              eax, dword ptr [ebp - 0x2c]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8d8d98fdffff         | lea                 ecx, [ebp - 0x268]

        $sequence_2 = { 84c0 746e 6a16 b9???????? e8???????? 50 8d4dd8 }
            // n = 7, score = 200
            //   84c0                 | test                al, al
            //   746e                 | je                  0x70
            //   6a16                 | push                0x16
            //   b9????????           |                     
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]

        $sequence_3 = { c7470400000000 c7470800000000 c78594fdffff01000000 c7459c00000000 c745a00f000000 }
            // n = 5, score = 200
            //   c7470400000000       | mov                 dword ptr [edi + 4], 0
            //   c7470800000000       | mov                 dword ptr [edi + 8], 0
            //   c78594fdffff01000000     | mov    dword ptr [ebp - 0x26c], 1
            //   c7459c00000000       | mov                 dword ptr [ebp - 0x64], 0
            //   c745a00f000000       | mov                 dword ptr [ebp - 0x60], 0xf

        $sequence_4 = { f20f1085f8feffff 8d855cffffff c645fc0f 83bd70ffffff10 0f43855cffffff 83ec08 f20f110424 }
            // n = 7, score = 200
            //   f20f1085f8feffff     | movsd               xmm0, qword ptr [ebp - 0x108]
            //   8d855cffffff         | lea                 eax, [ebp - 0xa4]
            //   c645fc0f             | mov                 byte ptr [ebp - 4], 0xf
            //   83bd70ffffff10       | cmp                 dword ptr [ebp - 0x90], 0x10
            //   0f43855cffffff       | cmovae              eax, dword ptr [ebp - 0xa4]
            //   83ec08               | sub                 esp, 8
            //   f20f110424           | movsd               qword ptr [esp], xmm0

        $sequence_5 = { 3bc6 742f 8bc8 e8???????? 0f1006 0f11851cffffff f30f7e4610 }
            // n = 7, score = 200
            //   3bc6                 | cmp                 eax, esi
            //   742f                 | je                  0x31
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   0f1006               | movups              xmm0, xmmword ptr [esi]
            //   0f11851cffffff       | movups              xmmword ptr [ebp - 0xe4], xmm0
            //   f30f7e4610           | movq                xmm0, qword ptr [esi + 0x10]

        $sequence_6 = { 2bc2 8b7d08 8955fc 3bc7 0f824e010000 8d043a }
            // n = 6, score = 200
            //   2bc2                 | sub                 eax, edx
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   3bc7                 | cmp                 eax, edi
            //   0f824e010000         | jb                  0x154
            //   8d043a               | lea                 eax, [edx + edi]

        $sequence_7 = { 8d410e 0f43b574ffffff 03f1 894584 56 }
            // n = 5, score = 200
            //   8d410e               | lea                 eax, [ecx + 0xe]
            //   0f43b574ffffff       | cmovae              esi, dword ptr [ebp - 0x8c]
            //   03f1                 | add                 esi, ecx
            //   894584               | mov                 dword ptr [ebp - 0x7c], eax
            //   56                   | push                esi

        $sequence_8 = { 68f4010000 51 6a02 50 ff15???????? }
            // n = 5, score = 200
            //   68f4010000           | push                0x1f4
            //   51                   | push                ecx
            //   6a02                 | push                2
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_9 = { 83f801 0f8209010000 8b7714 8d5a01 83cb0f 8975f8 3bd9 }
            // n = 7, score = 200
            //   83f801               | cmp                 eax, 1
            //   0f8209010000         | jb                  0x10f
            //   8b7714               | mov                 esi, dword ptr [edi + 0x14]
            //   8d5a01               | lea                 ebx, [edx + 1]
            //   83cb0f               | or                  ebx, 0xf
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   3bd9                 | cmp                 ebx, ecx

    condition:
        7 of them and filesize < 1007616
}

rule win_megumin_w0 {
    meta:
        description = "Detecting Megumin v2"
        author = "Fumik0_"
        date = "2019-05-02"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.megumin"
        malpedia_version = "20190503"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        
    strings:
        $s1 = "Megumin/2.0" wide ascii
        $s2 = "/cpu" wide ascii
        $s3 = "/task?hwid=" wide ascii
        $s4 = "/gate?hwid=" wide ascii
        $s5 = "/suicide" wide ascii

    condition:
        all of them
}