rule win_carbanak_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.carbanak."
        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.carbanak"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 68???????? 68???????? 6863c4f404 6a02 e8???????? 59 59 }
            // n = 7, score = 200
            //   68????????           |                     
            //   68????????           |                     
            //   6863c4f404           | push                0x4f4c463
            //   6a02                 | push                2
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_1 = { 85c0 7906 8b4604 8945f8 50 ff75f4 ff36 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   7906                 | jns                 8
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   50                   | push                eax
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   ff36                 | push                dword ptr [esi]

        $sequence_2 = { 59 59 50 68f1f0ad0a 56 e8???????? 59 }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   68f1f0ad0a           | push                0xaadf0f1
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_3 = { 03c1 50 51 e8???????? 83c40c 897704 5e }
            // n = 7, score = 200
            //   03c1                 | add                 eax, ecx
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   897704               | mov                 dword ptr [edi + 4], esi
            //   5e                   | pop                 esi

        $sequence_4 = { 8987d0000000 33db 43 8b45f8 40 8945f8 3b45dc }
            // n = 7, score = 200
            //   8987d0000000         | mov                 dword ptr [edi + 0xd0], eax
            //   33db                 | xor                 ebx, ebx
            //   43                   | inc                 ebx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   40                   | inc                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   3b45dc               | cmp                 eax, dword ptr [ebp - 0x24]

        $sequence_5 = { ff7508 8ad8 e8???????? 83c418 84db 5b }
            // n = 6, score = 200
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8ad8                 | mov                 bl, al
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   84db                 | test                bl, bl
            //   5b                   | pop                 ebx

        $sequence_6 = { 681189d60a 53 e8???????? 59 59 ffd0 8906 }
            // n = 7, score = 200
            //   681189d60a           | push                0xad68911
            //   53                   | push                ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   ffd0                 | call                eax
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_7 = { 807c08ff00 7408 49 807c08ff00 75f8 2bf1 }
            // n = 6, score = 200
            //   807c08ff00           | cmp                 byte ptr [eax + ecx - 1], 0
            //   7408                 | je                  0xa
            //   49                   | dec                 ecx
            //   807c08ff00           | cmp                 byte ptr [eax + ecx - 1], 0
            //   75f8                 | jne                 0xfffffffa
            //   2bf1                 | sub                 esi, ecx

        $sequence_8 = { 58 51 668945e0 ff15???????? 8365e400 668945e2 8d45f8 }
            // n = 7, score = 200
            //   58                   | pop                 eax
            //   51                   | push                ecx
            //   668945e0             | mov                 word ptr [ebp - 0x20], ax
            //   ff15????????         |                     
            //   8365e400             | and                 dword ptr [ebp - 0x1c], 0
            //   668945e2             | mov                 word ptr [ebp - 0x1e], ax
            //   8d45f8               | lea                 eax, [ebp - 8]

        $sequence_9 = { 8b06 c6040100 8bc6 5e 5d c20400 55 }
            // n = 7, score = 200
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   c6040100             | mov                 byte ptr [ecx + eax], 0
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   55                   | push                ebp

    condition:
        7 of them and filesize < 425984
}