rule win_ironhalo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.ironhalo."
        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.ironhalo"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { ff15???????? 8b3d???????? 68e0930400 85c0 7573 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   8b3d????????         |                     
            //   68e0930400           | push                0x493e0
            //   85c0                 | test                eax, eax
            //   7573                 | jne                 0x75

        $sequence_1 = { 89542410 89542414 52 668954241c }
            // n = 4, score = 200
            //   89542410             | mov                 dword ptr [esp + 0x10], edx
            //   89542414             | mov                 dword ptr [esp + 0x14], edx
            //   52                   | push                edx
            //   668954241c           | mov                 word ptr [esp + 0x1c], dx

        $sequence_2 = { 68???????? 51 68???????? 55 ff15???????? 8bd8 85db }
            // n = 7, score = 200
            //   68????????           |                     
            //   51                   | push                ecx
            //   68????????           |                     
            //   55                   | push                ebp
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   85db                 | test                ebx, ebx

        $sequence_3 = { 8d3c8d60e04000 c1e603 8b0f 80650b48 }
            // n = 4, score = 200
            //   8d3c8d60e04000       | lea                 edi, [ecx*4 + 0x40e060]
            //   c1e603               | shl                 esi, 3
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   80650b48             | and                 byte ptr [ebp + 0xb], 0x48

        $sequence_4 = { 7352 8bc8 8bf0 c1f905 83e61f 8d3c8d60e04000 c1e603 }
            // n = 7, score = 200
            //   7352                 | jae                 0x54
            //   8bc8                 | mov                 ecx, eax
            //   8bf0                 | mov                 esi, eax
            //   c1f905               | sar                 ecx, 5
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8d60e04000       | lea                 edi, [ecx*4 + 0x40e060]
            //   c1e603               | shl                 esi, 3

        $sequence_5 = { 8d442410 56 50 c744241844000000 }
            // n = 4, score = 200
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   56                   | push                esi
            //   50                   | push                eax
            //   c744241844000000     | mov                 dword ptr [esp + 0x18], 0x44

        $sequence_6 = { c3 ffd7 8d542438 8d442410 52 50 e8???????? }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   ffd7                 | call                edi
            //   8d542438             | lea                 edx, [esp + 0x38]
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   52                   | push                edx
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 33c9 33ed 8a06 57 84c0 }
            // n = 5, score = 200
            //   33c9                 | xor                 ecx, ecx
            //   33ed                 | xor                 ebp, ebp
            //   8a06                 | mov                 al, byte ptr [esi]
            //   57                   | push                edi
            //   84c0                 | test                al, al

        $sequence_8 = { 2bd1 8d34b5f8c14000 832600 83c60c 4a 75f7 }
            // n = 6, score = 200
            //   2bd1                 | sub                 edx, ecx
            //   8d34b5f8c14000       | lea                 esi, [esi*4 + 0x40c1f8]
            //   832600               | and                 dword ptr [esi], 0
            //   83c60c               | add                 esi, 0xc
            //   4a                   | dec                 edx
            //   75f7                 | jne                 0xfffffff9

        $sequence_9 = { 56 50 8d8c2438030000 6a01 51 e8???????? 8b44242c }
            // n = 7, score = 200
            //   56                   | push                esi
            //   50                   | push                eax
            //   8d8c2438030000       | lea                 ecx, [esp + 0x338]
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]

    condition:
        7 of them and filesize < 131072
}