rule win_h1n1_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.h1n1."
        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.h1n1"
        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 = { ff7508 56 ff35???????? 58 ffd0 0bc0 750a }
            // n = 7, score = 400
            //   ff7508               | push                dword ptr [ebp + 8]
            //   56                   | push                esi
            //   ff35????????         |                     
            //   58                   | pop                 eax
            //   ffd0                 | call                eax
            //   0bc0                 | or                  eax, eax
            //   750a                 | jne                 0xc

        $sequence_1 = { ff75fc ff75f8 ff35???????? 58 }
            // n = 4, score = 400
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff35????????         |                     
            //   58                   | pop                 eax

        $sequence_2 = { 2d8eff8aff ab 351c001400 ab 0505009fff }
            // n = 5, score = 400
            //   2d8eff8aff           | sub                 eax, 0xff8aff8e
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   351c001400           | xor                 eax, 0x14001c
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   0505009fff           | add                 eax, 0xff9f0005

        $sequence_3 = { 51 6a15 ff7508 ff35???????? }
            // n = 4, score = 400
            //   51                   | push                ecx
            //   6a15                 | push                0x15
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff35????????         |                     

        $sequence_4 = { 51 52 b950c30000 0f31 }
            // n = 4, score = 400
            //   51                   | push                ecx
            //   52                   | push                edx
            //   b950c30000           | mov                 ecx, 0xc350
            //   0f31                 | rdtsc               

        $sequence_5 = { ab ff75fc ff35???????? 58 ffd0 85c0 }
            // n = 6, score = 400
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff35????????         |                     
            //   58                   | pop                 eax
            //   ffd0                 | call                eax
            //   85c0                 | test                eax, eax

        $sequence_6 = { 0bc0 7423 8d45f8 50 ff75fc 6802000080 ff35???????? }
            // n = 7, score = 400
            //   0bc0                 | or                  eax, eax
            //   7423                 | je                  0x25
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   6802000080           | push                0x80000002
            //   ff35????????         |                     

        $sequence_7 = { 6a00 6a15 ff75fc 6a00 }
            // n = 4, score = 400
            //   6a00                 | push                0
            //   6a15                 | push                0x15
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   6a00                 | push                0

        $sequence_8 = { c3 56 8b742408 6804010000 68f8820010 8d86f8020000 50 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   56                   | push                esi
            //   8b742408             | mov                 esi, dword ptr [esp + 8]
            //   6804010000           | push                0x104
            //   68f8820010           | push                0x100082f8
            //   8d86f8020000         | lea                 eax, [esi + 0x2f8]
            //   50                   | push                eax

        $sequence_9 = { d1e9 330c8500850010 330c95f48b0010 42 890c95bc850010 81fae3000000 }
            // n = 6, score = 100
            //   d1e9                 | shr                 ecx, 1
            //   330c8500850010       | xor                 ecx, dword ptr [eax*4 + 0x10008500]
            //   330c95f48b0010       | xor                 ecx, dword ptr [edx*4 + 0x10008bf4]
            //   42                   | inc                 edx
            //   890c95bc850010       | mov                 dword ptr [edx*4 + 0x100085bc], ecx
            //   81fae3000000         | cmp                 edx, 0xe3

        $sequence_10 = { 8b048500850010 338774fcffff 33c1 8907 83c704 81ff7c8f0010 7cd4 }
            // n = 7, score = 100
            //   8b048500850010       | mov                 eax, dword ptr [eax*4 + 0x10008500]
            //   338774fcffff         | xor                 eax, dword ptr [edi - 0x38c]
            //   33c1                 | xor                 eax, ecx
            //   8907                 | mov                 dword ptr [edi], eax
            //   83c704               | add                 edi, 4
            //   81ff7c8f0010         | cmp                 edi, 0x10008f7c
            //   7cd4                 | jl                  0xffffffd6

        $sequence_11 = { f644242c01 55 50 6808850010 ff74242c b9686e0010 }
            // n = 6, score = 100
            //   f644242c01           | test                byte ptr [esp + 0x2c], 1
            //   55                   | push                ebp
            //   50                   | push                eax
            //   6808850010           | push                0x10008508
            //   ff74242c             | push                dword ptr [esp + 0x2c]
            //   b9686e0010           | mov                 ecx, 0x10006e68

        $sequence_12 = { 6a13 b86c6e0010 59 ff742428 }
            // n = 4, score = 100
            //   6a13                 | push                0x13
            //   b86c6e0010           | mov                 eax, 0x10006e6c
            //   59                   | pop                 ecx
            //   ff742428             | push                dword ptr [esp + 0x28]

        $sequence_13 = { 50 8d8578fdffff 50 68fc600010 6804010000 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   8d8578fdffff         | lea                 eax, [ebp - 0x288]
            //   50                   | push                eax
            //   68fc600010           | push                0x100060fc
            //   6804010000           | push                0x104

        $sequence_14 = { 5b 8bc1 83e001 d1e9 330c8500850010 330d???????? 890d???????? }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   8bc1                 | mov                 eax, ecx
            //   83e001               | and                 eax, 1
            //   d1e9                 | shr                 ecx, 1
            //   330c8500850010       | xor                 ecx, dword ptr [eax*4 + 0x10008500]
            //   330d????????         |                     
            //   890d????????         |                     

        $sequence_15 = { 50 ffb610850010 57 ff15???????? 83c608 83fe18 72e2 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ffb610850010         | push                dword ptr [esi + 0x10008510]
            //   57                   | push                edi
            //   ff15????????         |                     
            //   83c608               | add                 esi, 8
            //   83fe18               | cmp                 esi, 0x18
            //   72e2                 | jb                  0xffffffe4

    condition:
        7 of them and filesize < 172032
}