rule win_magala_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.magala."
        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.magala"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 7442 8b4df0 b853d9de75 2bcb f7e9 c1fa08 8bc2 }
            // n = 7, score = 200
            //   7442                 | je                  0x44
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   b853d9de75           | mov                 eax, 0x75ded953
            //   2bcb                 | sub                 ecx, ebx
            //   f7e9                 | imul                ecx
            //   c1fa08               | sar                 edx, 8
            //   8bc2                 | mov                 eax, edx

        $sequence_1 = { 3bdf 0f849d000000 33c0 c745e800000000 }
            // n = 4, score = 200
            //   3bdf                 | cmp                 ebx, edi
            //   0f849d000000         | je                  0xa3
            //   33c0                 | xor                 eax, eax
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0

        $sequence_2 = { c645fc08 8b45ec 83f810 7242 8b4dd8 40 3d00100000 }
            // n = 7, score = 200
            //   c645fc08             | mov                 byte ptr [ebp - 4], 8
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   83f810               | cmp                 eax, 0x10
            //   7242                 | jb                  0x44
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   40                   | inc                 eax
            //   3d00100000           | cmp                 eax, 0x1000

        $sequence_3 = { 7422 ff75e8 8b35???????? ffd6 ff75e4 ffd6 e9???????? }
            // n = 7, score = 200
            //   7422                 | je                  0x24
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   8b35????????         |                     
            //   ffd6                 | call                esi
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   ffd6                 | call                esi
            //   e9????????           |                     

        $sequence_4 = { 8b4f14 3bc8 744f 731c 50 8bcf e8???????? }
            // n = 7, score = 200
            //   8b4f14               | mov                 ecx, dword ptr [edi + 0x14]
            //   3bc8                 | cmp                 ecx, eax
            //   744f                 | je                  0x51
            //   731c                 | jae                 0x1e
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

        $sequence_5 = { e8???????? 837dbc08 8d5da8 0f435da8 85db 7450 8bcb }
            // n = 7, score = 200
            //   e8????????           |                     
            //   837dbc08             | cmp                 dword ptr [ebp - 0x44], 8
            //   8d5da8               | lea                 ebx, [ebp - 0x58]
            //   0f435da8             | cmovae              ebx, dword ptr [ebp - 0x58]
            //   85db                 | test                ebx, ebx
            //   7450                 | je                  0x52
            //   8bcb                 | mov                 ecx, ebx

        $sequence_6 = { 50 68???????? a3???????? e8???????? 83c408 833d????????00 7419 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   68????????           |                     
            //   a3????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   833d????????00       |                     
            //   7419                 | je                  0x1b

        $sequence_7 = { 0fb609 51 8d0c1e 51 e8???????? 8b5dfc 8b0b }
            // n = 7, score = 200
            //   0fb609               | movzx               ecx, byte ptr [ecx]
            //   51                   | push                ecx
            //   8d0c1e               | lea                 ecx, [esi + ebx]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]
            //   8b0b                 | mov                 ecx, dword ptr [ebx]

        $sequence_8 = { 0f8787000000 03c0 3d00100000 721a f6c11f 757e 8b41fc }
            // n = 7, score = 200
            //   0f8787000000         | ja                  0x8d
            //   03c0                 | add                 eax, eax
            //   3d00100000           | cmp                 eax, 0x1000
            //   721a                 | jb                  0x1c
            //   f6c11f               | test                cl, 0x1f
            //   757e                 | jne                 0x80
            //   8b41fc               | mov                 eax, dword ptr [ecx - 4]

        $sequence_9 = { e8???????? 8bc8 51 e8???????? 83c404 8b7d24 8b5d20 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b7d24               | mov                 edi, dword ptr [ebp + 0x24]
            //   8b5d20               | mov                 ebx, dword ptr [ebp + 0x20]

    condition:
        7 of them and filesize < 589824
}