rule win_blackcoffee_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.blackcoffee."
        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.blackcoffee"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 50 ff15???????? 8a85a0feffff 884602 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8a85a0feffff         | mov                 al, byte ptr [ebp - 0x160]
            //   884602               | mov                 byte ptr [esi + 2], al

        $sequence_1 = { 53 56 57 8b38 681c010000 6a40 }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   681c010000           | push                0x11c
            //   6a40                 | push                0x40

        $sequence_2 = { 6a40 57 57 6a00 ff15???????? }
            // n = 5, score = 200
            //   6a40                 | push                0x40
            //   57                   | push                edi
            //   57                   | push                edi
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_3 = { ff15???????? 894610 8d8534ffffff 6a20 83c614 50 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   8d8534ffffff         | lea                 eax, [ebp - 0xcc]
            //   6a20                 | push                0x20
            //   83c614               | add                 esi, 0x14
            //   50                   | push                eax

        $sequence_4 = { 8d7810 ff15???????? 8bf0 6a7c 57 }
            // n = 5, score = 200
            //   8d7810               | lea                 edi, [eax + 0x10]
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   6a7c                 | push                0x7c
            //   57                   | push                edi

        $sequence_5 = { 80661f00 83c40c 33c0 5e c9 c20800 55 }
            // n = 7, score = 200
            //   80661f00             | and                 byte ptr [esi + 0x1f], 0
            //   83c40c               | add                 esp, 0xc
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   c9                   | leave               
            //   c20800               | ret                 8
            //   55                   | push                ebp

        $sequence_6 = { 81ec64010000 53 56 57 6a1f 33db 59 }
            // n = 7, score = 200
            //   81ec64010000         | sub                 esp, 0x164
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a1f                 | push                0x1f
            //   33db                 | xor                 ebx, ebx
            //   59                   | pop                 ecx

        $sequence_7 = { 8906 8bc6 eb22 8b45e4 68f4010000 a3???????? ff15???????? }
            // n = 7, score = 200
            //   8906                 | mov                 dword ptr [esi], eax
            //   8bc6                 | mov                 eax, esi
            //   eb22                 | jmp                 0x24
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   68f4010000           | push                0x1f4
            //   a3????????           |                     
            //   ff15????????         |                     

        $sequence_8 = { 50 ffd7 a1???????? 3bc6 7403 50 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   a1????????           |                     
            //   3bc6                 | cmp                 eax, esi
            //   7403                 | je                  5
            //   50                   | push                eax

        $sequence_9 = { 8365fc00 83c010 6a04 50 8d45fc 50 }
            // n = 6, score = 200
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   83c010               | add                 eax, 0x10
            //   6a04                 | push                4
            //   50                   | push                eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 118784
}