rule win_turla_silentmoon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.turla_silentmoon."
        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.turla_silentmoon"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8b4dd8 57 6a0f 51 e8???????? 83c40c }
            // n = 6, score = 300
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   57                   | push                edi
            //   6a0f                 | push                0xf
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_1 = { 8b4508 50 ff15???????? 8a45ff 5f 5e 5b }
            // n = 7, score = 300
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8a45ff               | mov                 al, byte ptr [ebp - 1]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_2 = { 83c408 8b572c 8b4728 56 52 ffd0 }
            // n = 6, score = 300
            //   83c408               | add                 esp, 8
            //   8b572c               | mov                 edx, dword ptr [edi + 0x2c]
            //   8b4728               | mov                 eax, dword ptr [edi + 0x28]
            //   56                   | push                esi
            //   52                   | push                edx
            //   ffd0                 | call                eax

        $sequence_3 = { 85c0 7410 53 e8???????? 83c404 32c0 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   32c0                 | xor                 al, al

        $sequence_4 = { 898e5c020000 0fb77c7b4e 897df4 8b3cba 897dd4 8b7df4 }
            // n = 6, score = 300
            //   898e5c020000         | mov                 dword ptr [esi + 0x25c], ecx
            //   0fb77c7b4e           | movzx               edi, word ptr [ebx + edi*2 + 0x4e]
            //   897df4               | mov                 dword ptr [ebp - 0xc], edi
            //   8b3cba               | mov                 edi, dword ptr [edx + edi*4]
            //   897dd4               | mov                 dword ptr [ebp - 0x2c], edi
            //   8b7df4               | mov                 edi, dword ptr [ebp - 0xc]

        $sequence_5 = { 2bd1 8945f8 894dec 8975f0 83fa0a 7d13 8b5d08 }
            // n = 7, score = 300
            //   2bd1                 | sub                 edx, ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi
            //   83fa0a               | cmp                 edx, 0xa
            //   7d13                 | jge                 0x15
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]

        $sequence_6 = { 75f9 2bc2 a803 7409 c1e802 8d444003 eb06 }
            // n = 7, score = 300
            //   75f9                 | jne                 0xfffffffb
            //   2bc2                 | sub                 eax, edx
            //   a803                 | test                al, 3
            //   7409                 | je                  0xb
            //   c1e802               | shr                 eax, 2
            //   8d444003             | lea                 eax, [eax + eax*2 + 3]
            //   eb06                 | jmp                 8

        $sequence_7 = { ff15???????? 8945f8 85c0 7419 a1???????? }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   85c0                 | test                eax, eax
            //   7419                 | je                  0x1b
            //   a1????????           |                     

        $sequence_8 = { 8a54380b 8a5c3e0b 3ada 0f856affffff 8b5508 83c00c 83c60c }
            // n = 7, score = 300
            //   8a54380b             | mov                 dl, byte ptr [eax + edi + 0xb]
            //   8a5c3e0b             | mov                 bl, byte ptr [esi + edi + 0xb]
            //   3ada                 | cmp                 bl, dl
            //   0f856affffff         | jne                 0xffffff70
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   83c00c               | add                 eax, 0xc
            //   83c60c               | add                 esi, 0xc

        $sequence_9 = { 09be58020000 8b7df8 898e5c020000 0fb77c7b04 897df4 8b3cba 897dd4 }
            // n = 7, score = 300
            //   09be58020000         | or                  dword ptr [esi + 0x258], edi
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]
            //   898e5c020000         | mov                 dword ptr [esi + 0x25c], ecx
            //   0fb77c7b04           | movzx               edi, word ptr [ebx + edi*2 + 4]
            //   897df4               | mov                 dword ptr [ebp - 0xc], edi
            //   8b3cba               | mov                 edi, dword ptr [edx + edi*4]
            //   897dd4               | mov                 dword ptr [ebp - 0x2c], edi

    condition:
        7 of them and filesize < 204800
}