rule win_httpbrowser_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 56 ffb5bcfbffff ff15???????? f7d8 1bc0 f7d8 }
            // n = 6, score = 200
            //   56                   | push                esi
            //   ffb5bcfbffff         | push                dword ptr [ebp - 0x444]
            //   ff15????????         |                     
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax

        $sequence_1 = { 68???????? 8d85e4fbffff 50 ffd7 6a40 8d8578fbffff }
            // n = 6, score = 200
            //   68????????           |                     
            //   8d85e4fbffff         | lea                 eax, dword ptr [ebp - 0x41c]
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   6a40                 | push                0x40
            //   8d8578fbffff         | lea                 eax, dword ptr [ebp - 0x488]

        $sequence_2 = { 56 ff15???????? 83c40c 6a05 }
            // n = 4, score = 200
            //   56                   | push                esi
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   6a05                 | push                5

        $sequence_3 = { 0f84c2000000 8d85ecfdffff 68???????? 50 ff15???????? 8bf8 }
            // n = 6, score = 200
            //   0f84c2000000         | je                  0xc8
            //   8d85ecfdffff         | lea                 eax, dword ptr [ebp - 0x214]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_4 = { 50 ffd7 33c0 53 668985ecfdffff 8d85eefdffff }
            // n = 6, score = 200
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   33c0                 | xor                 eax, eax
            //   53                   | push                ebx
            //   668985ecfdffff       | mov                 word ptr [ebp - 0x214], ax
            //   8d85eefdffff         | lea                 eax, dword ptr [ebp - 0x212]

        $sequence_5 = { 59 be???????? f3a5 66a5 33c0 }
            // n = 5, score = 200
            //   59                   | pop                 ecx
            //   be????????           |                     
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   33c0                 | xor                 eax, eax

        $sequence_6 = { ffd6 85c0 745e 39bda0feffff 7519 }
            // n = 5, score = 200
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   745e                 | je                  0x60
            //   39bda0feffff         | cmp                 dword ptr [ebp - 0x160], edi
            //   7519                 | jne                 0x1b

        $sequence_7 = { 8dbda8fcffff a5 a5 a5 a5 385d08 }
            // n = 6, score = 200
            //   8dbda8fcffff         | lea                 edi, dword ptr [ebp - 0x358]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   385d08               | cmp                 byte ptr [ebp + 8], bl

        $sequence_8 = { ff15???????? 6a00 6880000000 6a02 6a00 6a02 8d9514fdffff }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   6880000000           | push                0x80
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   8d9514fdffff         | lea                 edx, dword ptr [ebp - 0x2ec]

        $sequence_9 = { 5d 5d 9d 5d 50 55 8bec }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   50                   | push                eax
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_10 = { ff15???????? 8b7d0c 8d45ec 6a00 50 8d4df8 57 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8b7d0c               | mov                 edi, dword ptr [ebp + 0xc]
            //   8d45ec               | lea                 eax, dword ptr [ebp - 0x14]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8d4df8               | lea                 ecx, dword ptr [ebp - 8]
            //   57                   | push                edi

        $sequence_11 = { 85d2 8955fc 0f859d000000 50 }
            // n = 4, score = 100
            //   85d2                 | test                edx, edx
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   0f859d000000         | jne                 0xa3
            //   50                   | push                eax

        $sequence_12 = { 33c0 8dbdedc7ffff c685ecc7ffff00 f3ab 8b5510 c745f000280000 }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   8dbdedc7ffff         | lea                 edi, dword ptr [ebp - 0x3813]
            //   c685ecc7ffff00       | mov                 byte ptr [ebp - 0x3814], 0
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   c745f000280000       | mov                 dword ptr [ebp - 0x10], 0x2800

        $sequence_13 = { 5d 9d 5d 8b75ec bb01000000 56 }
            // n = 6, score = 100
            //   5d                   | pop                 ebp
            //   9d                   | popfd               
            //   5d                   | pop                 ebp
            //   8b75ec               | mov                 esi, dword ptr [ebp - 0x14]
            //   bb01000000           | mov                 ebx, 1
            //   56                   | push                esi

        $sequence_14 = { ff15???????? b9ff070000 33c0 8dbda0c5ffff f3ab 66ab }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   b9ff070000           | mov                 ecx, 0x7ff
            //   33c0                 | xor                 eax, eax
            //   8dbda0c5ffff         | lea                 edi, dword ptr [ebp - 0x3a60]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax

        $sequence_15 = { 5d 8b4dfc 51 52 8b5508 6aff 52 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   6aff                 | push                -1
            //   52                   | push                edx

    condition:
        7 of them and filesize < 188416
}