rule win_httpbrowser_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.httpbrowser."
        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.httpbrowser"
        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 = { 33c0 befe010000 56 66898578fdffff 8d857afdffff }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   befe010000           | mov                 esi, 0x1fe
            //   56                   | push                esi
            //   66898578fdffff       | mov                 word ptr [ebp - 0x288], ax
            //   8d857afdffff         | lea                 eax, [ebp - 0x286]

        $sequence_1 = { 8365e400 53 56 8b7508 57 8d86a40e0000 }
            // n = 6, score = 200
            //   8365e400             | and                 dword ptr [ebp - 0x1c], 0
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8d86a40e0000         | lea                 eax, [esi + 0xea4]

        $sequence_2 = { 53 53 53 68???????? ff15???????? 3bc3 0f847a010000 }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   68????????           |                     
            //   ff15????????         |                     
            //   3bc3                 | cmp                 eax, ebx
            //   0f847a010000         | je                  0x180

        $sequence_3 = { ff15???????? 83c420 391d???????? 0f8588000000 ff15???????? 6800010000 8d8ddcfdffff }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   83c420               | add                 esp, 0x20
            //   391d????????         |                     
            //   0f8588000000         | jne                 0x8e
            //   ff15????????         |                     
            //   6800010000           | push                0x100
            //   8d8ddcfdffff         | lea                 ecx, [ebp - 0x224]

        $sequence_4 = { 57 56 ff15???????? 68ff030000 8d85fdfbffff 6a00 50 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   56                   | push                esi
            //   ff15????????         |                     
            //   68ff030000           | push                0x3ff
            //   8d85fdfbffff         | lea                 eax, [ebp - 0x403]
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_5 = { 89b5eafdffff 89b5dcfdffff c785d4fdffff03000000 ff15???????? 8d85f0fdffff }
            // n = 5, score = 200
            //   89b5eafdffff         | mov                 dword ptr [ebp - 0x216], esi
            //   89b5dcfdffff         | mov                 dword ptr [ebp - 0x224], esi
            //   c785d4fdffff03000000     | mov    dword ptr [ebp - 0x22c], 3
            //   ff15????????         |                     
            //   8d85f0fdffff         | lea                 eax, [ebp - 0x210]

        $sequence_6 = { 33c0 40 56 50 8985a8fbffff 6800000080 8d85ecfdffff }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   56                   | push                esi
            //   50                   | push                eax
            //   8985a8fbffff         | mov                 dword ptr [ebp - 0x458], eax
            //   6800000080           | push                0x80000000
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]

        $sequence_7 = { a1???????? 89442418 a1???????? 6800020000 89442420 8d442424 57 }
            // n = 7, score = 200
            //   a1????????           |                     
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   a1????????           |                     
            //   6800020000           | push                0x200
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   57                   | push                edi

        $sequence_8 = { 58 64a300000000 5d 5d 9d 5d b900020000 }
            // n = 7, score = 100
            //   58                   | pop                 eax
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   5d                   | pop                 ebp
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   b900020000           | mov                 ecx, 0x200

        $sequence_9 = { 7373 8bc8 8bf0 c1f905 83e61f 8d3c8d00644100 c1e603 }
            // n = 7, score = 100
            //   7373                 | jae                 0x75
            //   8bc8                 | mov                 ecx, eax
            //   8bf0                 | mov                 esi, eax
            //   c1f905               | sar                 ecx, 5
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8d00644100       | lea                 edi, [ecx*4 + 0x416400]
            //   c1e603               | shl                 esi, 3

        $sequence_10 = { 6689954cf7ffff f3ab 8955f8 8955fc c745d002000000 c745cc2c010000 66ab }
            // n = 7, score = 100
            //   6689954cf7ffff       | mov                 word ptr [ebp - 0x8b4], dx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   c745d002000000       | mov                 dword ptr [ebp - 0x30], 2
            //   c745cc2c010000       | mov                 dword ptr [ebp - 0x34], 0x12c
            //   66ab                 | stosw               word ptr es:[edi], ax

        $sequence_11 = { b907000000 8d7ddc 8945d8 8945fc f3ab }
            // n = 5, score = 100
            //   b907000000           | mov                 ecx, 7
            //   8d7ddc               | lea                 edi, [ebp - 0x24]
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_12 = { 58 68000000f0 6a01 52 52 8d55f8 }
            // n = 6, score = 100
            //   58                   | pop                 eax
            //   68000000f0           | push                0xf0000000
            //   6a01                 | push                1
            //   52                   | push                edx
            //   52                   | push                edx
            //   8d55f8               | lea                 edx, [ebp - 8]

        $sequence_13 = { b8ec120000 e8???????? 53 56 57 33d2 b91f000000 }
            // n = 7, score = 100
            //   b8ec120000           | mov                 eax, 0x12ec
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   33d2                 | xor                 edx, edx
            //   b91f000000           | mov                 ecx, 0x1f

        $sequence_14 = { 57 50 51 e8???????? 83c410 33c0 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   33c0                 | xor                 eax, eax

        $sequence_15 = { c3 0fb6442404 8a4c240c 8488a1524100 751c }
            // n = 5, score = 100
            //   c3                   | ret                 
            //   0fb6442404           | movzx               eax, byte ptr [esp + 4]
            //   8a4c240c             | mov                 cl, byte ptr [esp + 0xc]
            //   8488a1524100         | test                byte ptr [eax + 0x4152a1], cl
            //   751c                 | jne                 0x1e

    condition:
        7 of them and filesize < 188416
}