rule win_icedid_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-11-26"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.1a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.icedid"
        malpedia_version = "20190204"
        malpedia_license = "CC BY-NC-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 / approach will be published in the near future 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 = { d1c8 f7d0 d1c8 2d20010000 d1c0 f7d0 }
            // n = 6, score = 1200
            //   d1c8                 | ror                 eax, 1
            //   f7d0                 | not                 eax
            //   d1c8                 | ror                 eax, 1
            //   2d20010000           | sub                 eax, 0x120
            //   d1c0                 | rol                 eax, 1
            //   f7d0                 | not                 eax

        $sequence_1 = { 57 6a00 ff15???????? 50 ff15???????? 8bc6 eb02 }
            // n = 7, score = 1100
            //   57                   | push                edi
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bc6                 | mov                 eax, esi
            //   eb02                 | jmp                 4

        $sequence_2 = { 8b457c 83e800 7439 83e801 741f }
            // n = 5, score = 1100
            //   8b457c               | mov                 eax, dword ptr [ebp + 0x7c]
            //   83e800               | sub                 eax, 0
            //   7439                 | je                  0x3b
            //   83e801               | sub                 eax, 1
            //   741f                 | je                  0x21

        $sequence_3 = { 50 ff15???????? eb0f 6a08 ff15???????? 50 }
            // n = 6, score = 1100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   eb0f                 | jmp                 0x11
            //   6a08                 | push                8
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_4 = { 8bf8 85ff 7418 c60700 47 57 }
            // n = 6, score = 1100
            //   8bf8                 | mov                 edi, eax
            //   85ff                 | test                edi, edi
            //   7418                 | je                  0x1a
            //   c60700               | mov                 byte ptr [edi], 0
            //   47                   | inc                 edi
            //   57                   | push                edi

        $sequence_5 = { ff15???????? 85c0 7511 56 57 }
            // n = 5, score = 1100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_6 = { 0fb60d???????? 50 0fb605???????? 50 0fb605???????? 50 }
            // n = 6, score = 1100
            //   0fb60d????????       |                     
            //   50                   | push                eax
            //   0fb605????????       |                     
            //   50                   | push                eax
            //   0fb605????????       |                     
            //   50                   | push                eax

        $sequence_7 = { 5d c3 8b542404 33c9 }
            // n = 4, score = 1000
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b542404             | mov                 edx, dword ptr [esp + 4]
            //   33c9                 | xor                 ecx, ecx

        $sequence_8 = { c1c90d 0fbec0 03c8 46 }
            // n = 4, score = 1000
            //   c1c90d               | ror                 ecx, 0xd
            //   0fbec0               | movsx               eax, al
            //   03c8                 | add                 ecx, eax
            //   46                   | inc                 esi

        $sequence_9 = { f7d8 1bc0 f7d0 2345fc 8be5 5d c3 }
            // n = 7, score = 1000
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d0                 | not                 eax
            //   2345fc               | and                 eax, dword ptr [ebp - 4]
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_10 = { 59 59 c3 33c0 ebf5 55 }
            // n = 6, score = 900
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   33c0                 | xor                 eax, eax
            //   ebf5                 | jmp                 0xfffffff7
            //   55                   | push                ebp

        $sequence_11 = { 8bf0 8d45fc 50 ff75fc 6a05 }
            // n = 5, score = 900
            //   8bf0                 | mov                 esi, eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   6a05                 | push                5

        $sequence_12 = { 8d5004 89542414 8b12 85d2 7454 8d6af8 d1ed }
            // n = 7, score = 700
            //   8d5004               | lea                 edx, [eax + 4]
            //   89542414             | mov                 dword ptr [esp + 0x14], edx
            //   8b12                 | mov                 edx, dword ptr [edx]
            //   85d2                 | test                edx, edx
            //   7454                 | je                  0x56
            //   8d6af8               | lea                 ebp, [edx - 8]
            //   d1ed                 | shr                 ebp, 1

        $sequence_13 = { 0fb6440b34 50 ff740b28 8b440b24 }
            // n = 4, score = 700
            //   0fb6440b34           | movzx               eax, byte ptr [ebx + ecx + 0x34]
            //   50                   | push                eax
            //   ff740b28             | push                dword ptr [ebx + ecx + 0x28]
            //   8b440b24             | mov                 eax, dword ptr [ebx + ecx + 0x24]

        $sequence_14 = { 8a4173 a808 75f5 a804 }
            // n = 4, score = 400
            //   8a4173               | mov                 al, byte ptr [ecx + 0x73]
            //   a808                 | test                al, 8
            //   75f5                 | jne                 0xfffffff7
            //   a804                 | test                al, 4

        $sequence_15 = { ff15???????? 85c0 750a b8010000c0 e9???????? }
            // n = 5, score = 400
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   b8010000c0           | mov                 eax, 0xc0000001
            //   e9????????           |                     

        $sequence_16 = { ff5010 85c0 7407 33c0 e9???????? }
            // n = 5, score = 400
            //   ff5010               | call                dword ptr [eax + 0x10]
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

        $sequence_17 = { 48 8d542420 41 b804010000 33c9 8bde ff15???????? }
            // n = 7, score = 200
            //   48                   | dec                 eax
            //   8d542420             | lea                 edx, [esp + 0x20]
            //   41                   | inc                 ecx
            //   b804010000           | mov                 eax, 0x104
            //   33c9                 | xor                 ecx, ecx
            //   8bde                 | mov                 ebx, esi
            //   ff15????????         |                     

        $sequence_18 = { 57 41 56 48 83ec20 0fb7f1 }
            // n = 6, score = 200
            //   57                   | push                edi
            //   41                   | inc                 ecx
            //   56                   | push                esi
            //   48                   | dec                 eax
            //   83ec20               | sub                 esp, 0x20
            //   0fb7f1               | movzx               esi, cx

        $sequence_19 = { 8b4810 4a 8b04c1 44 3b480c 72c1 48 }
            // n = 7, score = 200
            //   8b4810               | mov                 ecx, dword ptr [eax + 0x10]
            //   4a                   | dec                 edx
            //   8b04c1               | mov                 eax, dword ptr [ecx + eax*8]
            //   44                   | inc                 esp
            //   3b480c               | cmp                 ecx, dword ptr [eax + 0xc]
            //   72c1                 | jb                  0xffffffc3
            //   48                   | dec                 eax

        $sequence_20 = { 0fb65309 48 035301 48 89573a 48 8d542430 }
            // n = 7, score = 200
            //   0fb65309             | movzx               edx, byte ptr [ebx + 9]
            //   48                   | dec                 eax
            //   035301               | add                 edx, dword ptr [ebx + 1]
            //   48                   | dec                 eax
            //   89573a               | mov                 dword ptr [edi + 0x3a], edx
            //   48                   | dec                 eax
            //   8d542430             | lea                 edx, [esp + 0x30]

        $sequence_21 = { 48 8d510a 48 8b4c0b01 48 }
            // n = 5, score = 200
            //   48                   | dec                 eax
            //   8d510a               | lea                 edx, [ecx + 0xa]
            //   48                   | dec                 eax
            //   8b4c0b01             | mov                 ecx, dword ptr [ebx + ecx + 1]
            //   48                   | dec                 eax

    condition:
        7 of them
}