rule win_socksbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.socksbot."
        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.socksbot"
        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 = { 55 8bec 81ec0c010000 53 56 57 8b7d14 }
            // n = 7, score = 300
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec0c010000         | sub                 esp, 0x10c
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d14               | mov                 edi, dword ptr [ebp + 0x14]

        $sequence_1 = { 7faa 5f 5e 5b c9 c3 55 }
            // n = 7, score = 300
            //   7faa                 | jg                  0xffffffac
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp

        $sequence_2 = { 50 e8???????? 59 59 6a00 6a04 8d4508 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   6a00                 | push                0
            //   6a04                 | push                4
            //   8d4508               | lea                 eax, dword ptr [ebp + 8]

        $sequence_3 = { 81e1ff0f0000 c1e810 66010411 eb10 663b45d0 750a 81e1ff0f0000 }
            // n = 7, score = 300
            //   81e1ff0f0000         | and                 ecx, 0xfff
            //   c1e810               | shr                 eax, 0x10
            //   66010411             | add                 word ptr [ecx + edx], ax
            //   eb10                 | jmp                 0x12
            //   663b45d0             | cmp                 ax, word ptr [ebp - 0x30]
            //   750a                 | jne                 0xc
            //   81e1ff0f0000         | and                 ecx, 0xfff

        $sequence_4 = { ff750c 57 ffd6 8d45fc 50 57 ffd6 }
            // n = 7, score = 300
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   57                   | push                edi
            //   ffd6                 | call                esi

        $sequence_5 = { bb???????? ff33 e8???????? 832300 }
            // n = 4, score = 300
            //   bb????????           |                     
            //   ff33                 | push                dword ptr [ebx]
            //   e8????????           |                     
            //   832300               | and                 dword ptr [ebx], 0

        $sequence_6 = { 0fb7c1 50 68ffff0000 8d7e09 57 ff35???????? }
            // n = 6, score = 300
            //   0fb7c1               | movzx               eax, cx
            //   50                   | push                eax
            //   68ffff0000           | push                0xffff
            //   8d7e09               | lea                 edi, dword ptr [esi + 9]
            //   57                   | push                edi
            //   ff35????????         |                     

        $sequence_7 = { 0fb67304 56 8d4305 50 8d85f0feffff 50 }
            // n = 6, score = 300
            //   0fb67304             | movzx               esi, byte ptr [ebx + 4]
            //   56                   | push                esi
            //   8d4305               | lea                 eax, dword ptr [ebx + 5]
            //   50                   | push                eax
            //   8d85f0feffff         | lea                 eax, dword ptr [ebp - 0x110]
            //   50                   | push                eax

        $sequence_8 = { 85c0 7564 8b45fc 33f6 8b08 }
            // n = 5, score = 300
            //   85c0                 | test                eax, eax
            //   7564                 | jne                 0x66
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   33f6                 | xor                 esi, esi
            //   8b08                 | mov                 ecx, dword ptr [eax]

        $sequence_9 = { 8d8520ffffff 53 56 57 33db }
            // n = 5, score = 300
            //   8d8520ffffff         | lea                 eax, dword ptr [ebp - 0xe0]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   33db                 | xor                 ebx, ebx

    condition:
        7 of them and filesize < 73728
}