rule win_icedid_downloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.icedid_downloader."
        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.icedid_downloader"
        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 = { 8d45e4 50 e8???????? 85c0 0f8895000000 }
            // n = 5, score = 400
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8895000000         | js                  0x9b

        $sequence_1 = { e8???????? 8d45c8 bf???????? 50 57 e8???????? }
            // n = 6, score = 400
            //   e8????????           |                     
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   bf????????           |                     
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_2 = { e8???????? 85f6 740c 8b4508 3b07 7505 }
            // n = 6, score = 400
            //   e8????????           |                     
            //   85f6                 | test                esi, esi
            //   740c                 | je                  0xe
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   3b07                 | cmp                 eax, dword ptr [edi]
            //   7505                 | jne                 7

        $sequence_3 = { 50 6802000080 ffd7 5f 8bc6 5e 5d }
            // n = 7, score = 400
            //   50                   | push                eax
            //   6802000080           | push                0x80000002
            //   ffd7                 | call                edi
            //   5f                   | pop                 edi
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_4 = { b8???????? 50 55 50 8d442424 50 56 }
            // n = 7, score = 400
            //   b8????????           |                     
            //   50                   | push                eax
            //   55                   | push                ebp
            //   50                   | push                eax
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_5 = { ff5150 8b45fc 8d75c4 83ec10 }
            // n = 4, score = 400
            //   ff5150               | call                dword ptr [ecx + 0x50]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8d75c4               | lea                 esi, [ebp - 0x3c]
            //   83ec10               | sub                 esp, 0x10

        $sequence_6 = { 53 55 33ed 33db 43 896c2410 55 }
            // n = 7, score = 400
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   33ed                 | xor                 ebp, ebp
            //   33db                 | xor                 ebx, ebx
            //   43                   | inc                 ebx
            //   896c2410             | mov                 dword ptr [esp + 0x10], ebp
            //   55                   | push                ebp

        $sequence_7 = { ff15???????? 6a05 5b 8d4554 c7450001000000 50 }
            // n = 6, score = 400
            //   ff15????????         |                     
            //   6a05                 | push                5
            //   5b                   | pop                 ebx
            //   8d4554               | lea                 eax, [ebp + 0x54]
            //   c7450001000000       | mov                 dword ptr [ebp], 1
            //   50                   | push                eax

        $sequence_8 = { 8bf8 56 8d442420 50 8b11 56 56 }
            // n = 7, score = 400
            //   8bf8                 | mov                 edi, eax
            //   56                   | push                esi
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   50                   | push                eax
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   56                   | push                esi
            //   56                   | push                esi

        $sequence_9 = { 83c410 8d442410 53 50 53 }
            // n = 5, score = 400
            //   83c410               | add                 esp, 0x10
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 40960
}