rule win_blackenergy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.blackenergy."
        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.blackenergy"
        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 = { 03f7 8b4e20 8b461c 03cf 894dbc 8b4e24 03c7 }
            // n = 7, score = 200
            //   03f7                 | add                 esi, edi
            //   8b4e20               | mov                 ecx, dword ptr [esi + 0x20]
            //   8b461c               | mov                 eax, dword ptr [esi + 0x1c]
            //   03cf                 | add                 ecx, edi
            //   894dbc               | mov                 dword ptr [ebp - 0x44], ecx
            //   8b4e24               | mov                 ecx, dword ptr [esi + 0x24]
            //   03c7                 | add                 eax, edi

        $sequence_1 = { 8bec 83c4e8 53 c745f800000000 c745fc00000000 c745f400000000 c745f000000000 }
            // n = 7, score = 200
            //   8bec                 | mov                 ebp, esp
            //   83c4e8               | add                 esp, -0x18
            //   53                   | push                ebx
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   c745f400000000       | mov                 dword ptr [ebp - 0xc], 0
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0

        $sequence_2 = { 56 ff7508 8901 50 6aff ff75f8 56 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   50                   | push                eax
            //   6aff                 | push                -1
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   56                   | push                esi

        $sequence_3 = { 8bc3 e8???????? 8bf0 85f6 7408 ff75fc e8???????? }
            // n = 7, score = 200
            //   8bc3                 | mov                 eax, ebx
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7408                 | je                  0xa
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     

        $sequence_4 = { 56 8d55ec 33f6 52 50 8975ec 8975f4 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   33f6                 | xor                 esi, esi
            //   52                   | push                edx
            //   50                   | push                eax
            //   8975ec               | mov                 dword ptr [ebp - 0x14], esi
            //   8975f4               | mov                 dword ptr [ebp - 0xc], esi

        $sequence_5 = { 55 8bec 81eca4000000 8365fc00 53 56 8d855cffffff }
            // n = 7, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81eca4000000         | sub                 esp, 0xa4
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8d855cffffff         | lea                 eax, [ebp - 0xa4]

        $sequence_6 = { ff75c0 ff75c8 e8???????? 8bc7 2b4510 5e 5f }
            // n = 7, score = 200
            //   ff75c0               | push                dword ptr [ebp - 0x40]
            //   ff75c8               | push                dword ptr [ebp - 0x38]
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi
            //   2b4510               | sub                 eax, dword ptr [ebp + 0x10]
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi

        $sequence_7 = { 75de 58 59 49 75c2 c78574ffffff00000000 897588 }
            // n = 7, score = 200
            //   75de                 | jne                 0xffffffe0
            //   58                   | pop                 eax
            //   59                   | pop                 ecx
            //   49                   | dec                 ecx
            //   75c2                 | jne                 0xffffffc4
            //   c78574ffffff00000000     | mov    dword ptr [ebp - 0x8c], 0
            //   897588               | mov                 dword ptr [ebp - 0x78], esi

        $sequence_8 = { 40 50 6a40 ff15???????? 894314 85c0 0f84ab000000 }
            // n = 7, score = 200
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   6a40                 | push                0x40
            //   ff15????????         |                     
            //   894314               | mov                 dword ptr [ebx + 0x14], eax
            //   85c0                 | test                eax, eax
            //   0f84ab000000         | je                  0xb1

        $sequence_9 = { ff75f8 895df0 895dec ff15???????? 85c0 0f85df010000 895dd0 }
            // n = 7, score = 200
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85df010000         | jne                 0x1e5
            //   895dd0               | mov                 dword ptr [ebp - 0x30], ebx

    condition:
        7 of them and filesize < 98304
}