rule win_satan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.satan."
        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.satan"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 7421 8b10 8b4a08 3b4e04 740f c70200000000 }
            // n = 6, score = 100
            //   7421                 | je                  0x23
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8b4a08               | mov                 ecx, dword ptr [edx + 8]
            //   3b4e04               | cmp                 ecx, dword ptr [esi + 4]
            //   740f                 | je                  0x11
            //   c70200000000         | mov                 dword ptr [edx], 0

        $sequence_1 = { c74408e0d0724700 8b41e0 8b5004 8d42e0 89440adc 8d51f8 8b42f8 }
            // n = 7, score = 100
            //   c74408e0d0724700     | mov                 dword ptr [eax + ecx - 0x20], 0x4772d0
            //   8b41e0               | mov                 eax, dword ptr [ecx - 0x20]
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   8d42e0               | lea                 eax, dword ptr [edx - 0x20]
            //   89440adc             | mov                 dword ptr [edx + ecx - 0x24], eax
            //   8d51f8               | lea                 edx, dword ptr [ecx - 8]
            //   8b42f8               | mov                 eax, dword ptr [edx - 8]

        $sequence_2 = { 85db 7457 6a00 6a00 6a00 68???????? 83ec1c }
            // n = 7, score = 100
            //   85db                 | test                ebx, ebx
            //   7457                 | je                  0x59
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     
            //   83ec1c               | sub                 esp, 0x1c

        $sequence_3 = { 8b55f8 0fb682e0214200 ff2485b8214200 8b4dfc 8b5110 }
            // n = 5, score = 100
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   0fb682e0214200       | movzx               eax, byte ptr [edx + 0x4221e0]
            //   ff2485b8214200       | jmp                 dword ptr [eax*4 + 0x4221b8]
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b5110               | mov                 edx, dword ptr [ecx + 0x10]

        $sequence_4 = { 750e 6a02 e8???????? 83c404 32c0 eb68 ba02000000 }
            // n = 7, score = 100
            //   750e                 | jne                 0x10
            //   6a02                 | push                2
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   32c0                 | xor                 al, al
            //   eb68                 | jmp                 0x6a
            //   ba02000000           | mov                 edx, 2

        $sequence_5 = { 7548 e8???????? bf???????? bbe1000000 57 68???????? 6a00 }
            // n = 7, score = 100
            //   7548                 | jne                 0x4a
            //   e8????????           |                     
            //   bf????????           |                     
            //   bbe1000000           | mov                 ebx, 0xe1
            //   57                   | push                edi
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_6 = { 7411 8b75dc 85f6 740a }
            // n = 4, score = 100
            //   7411                 | je                  0x13
            //   8b75dc               | mov                 esi, dword ptr [ebp - 0x24]
            //   85f6                 | test                esi, esi
            //   740a                 | je                  0xc

        $sequence_7 = { 003c22 44 00f5 22440000 0201 0200 0201 }
            // n = 7, score = 100
            //   003c22               | add                 byte ptr [edx], bh
            //   44                   | inc                 esp
            //   00f5                 | add                 ch, dh
            //   22440000             | and                 al, byte ptr [eax + eax]
            //   0201                 | add                 al, byte ptr [ecx]
            //   0200                 | add                 al, byte ptr [eax]
            //   0201                 | add                 al, byte ptr [ecx]

        $sequence_8 = { 8b45d4 0fb608 83e107 b801000000 d3e0 0fb64c15dc 0bc8 }
            // n = 7, score = 100
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   0fb608               | movzx               ecx, byte ptr [eax]
            //   83e107               | and                 ecx, 7
            //   b801000000           | mov                 eax, 1
            //   d3e0                 | shl                 eax, cl
            //   0fb64c15dc           | movzx               ecx, byte ptr [ebp + edx - 0x24]
            //   0bc8                 | or                  ecx, eax

        $sequence_9 = { 8b4014 03c1 3bc2 7358 68aa000000 68???????? 68???????? }
            // n = 7, score = 100
            //   8b4014               | mov                 eax, dword ptr [eax + 0x14]
            //   03c1                 | add                 eax, ecx
            //   3bc2                 | cmp                 eax, edx
            //   7358                 | jae                 0x5a
            //   68aa000000           | push                0xaa
            //   68????????           |                     
            //   68????????           |                     

    condition:
        7 of them and filesize < 1163264
}