rule win_satan_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 8b45ec 6a2c 6a01 ff7004 e8???????? 83c40c 6a00 }
            // n = 7, score = 100
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   6a2c                 | push                0x2c
            //   6a01                 | push                1
            //   ff7004               | push                dword ptr [eax + 4]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a00                 | push                0

        $sequence_1 = { 890e 8b45f0 8b7004 395e08 }
            // n = 4, score = 100
            //   890e                 | mov                 dword ptr [esi], ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b7004               | mov                 esi, dword ptr [eax + 4]
            //   395e08               | cmp                 dword ptr [esi + 8], ebx

        $sequence_2 = { 7417 85f6 7404 3bd6 750f c70000000000 8b01 }
            // n = 7, score = 100
            //   7417                 | je                  0x19
            //   85f6                 | test                esi, esi
            //   7404                 | je                  6
            //   3bd6                 | cmp                 edx, esi
            //   750f                 | jne                 0x11
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   8b01                 | mov                 eax, dword ptr [ecx]

        $sequence_3 = { 8d4dac c6470c01 e8???????? 8d4de0 e8???????? 8bc7 }
            // n = 6, score = 100
            //   8d4dac               | lea                 ecx, [ebp - 0x54]
            //   c6470c01             | mov                 byte ptr [edi + 0xc], 1
            //   e8????????           |                     
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi

        $sequence_4 = { 8d4dd4 c745fc05000000 e8???????? 8d4dd4 e8???????? 8ac3 }
            // n = 6, score = 100
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   c745fc05000000       | mov                 dword ptr [ebp - 4], 5
            //   e8????????           |                     
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   e8????????           |                     
            //   8ac3                 | mov                 al, bl

        $sequence_5 = { 48 894108 51 ff7514 8b4de0 e8???????? 8d4d0c }
            // n = 7, score = 100
            //   48                   | dec                 eax
            //   894108               | mov                 dword ptr [ecx + 8], eax
            //   51                   | push                ecx
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   e8????????           |                     
            //   8d4d0c               | lea                 ecx, [ebp + 0xc]

        $sequence_6 = { c1fa06 8b45fc 8b08 8b01 83e03f 6bc830 8b149540e04700 }
            // n = 7, score = 100
            //   c1fa06               | sar                 edx, 6
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   83e03f               | and                 eax, 0x3f
            //   6bc830               | imul                ecx, eax, 0x30
            //   8b149540e04700       | mov                 edx, dword ptr [edx*4 + 0x47e040]

        $sequence_7 = { c7432400000000 0f8238010000 8b4314 e9???????? 8b4104 3b4808 7505 }
            // n = 7, score = 100
            //   c7432400000000       | mov                 dword ptr [ebx + 0x24], 0
            //   0f8238010000         | jb                  0x13e
            //   8b4314               | mov                 eax, dword ptr [ebx + 0x14]
            //   e9????????           |                     
            //   8b4104               | mov                 eax, dword ptr [ecx + 4]
            //   3b4808               | cmp                 ecx, dword ptr [eax + 8]
            //   7505                 | jne                 7

        $sequence_8 = { 85f6 7456 83fe01 7251 837f1810 8d4704 894508 }
            // n = 7, score = 100
            //   85f6                 | test                esi, esi
            //   7456                 | je                  0x58
            //   83fe01               | cmp                 esi, 1
            //   7251                 | jb                  0x53
            //   837f1810             | cmp                 dword ptr [edi + 0x18], 0x10
            //   8d4704               | lea                 eax, [edi + 4]
            //   894508               | mov                 dword ptr [ebp + 8], eax

        $sequence_9 = { 837dfc00 7d04 33c0 eb69 8b4dfc 8b14cd24e44600 8955f8 }
            // n = 7, score = 100
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0
            //   7d04                 | jge                 6
            //   33c0                 | xor                 eax, eax
            //   eb69                 | jmp                 0x6b
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b14cd24e44600       | mov                 edx, dword ptr [ecx*8 + 0x46e424]
            //   8955f8               | mov                 dword ptr [ebp - 8], edx

    condition:
        7 of them and filesize < 1163264
}