rule win_derusbi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.derusbi."
        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.derusbi"
        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 = { 50 ff15???????? 56 ff15???????? e8???????? 84c0 74f0 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   74f0                 | je                  0xfffffff2

        $sequence_1 = { 5d c20400 55 8bec 8b4d08 e8???????? 50 }
            // n = 7, score = 200
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_2 = { 0f86fd000000 ffb5f4fdffff ffd7 8bc8 8b85f4fdffff 33d2 807c01fe3d }
            // n = 7, score = 200
            //   0f86fd000000         | jbe                 0x103
            //   ffb5f4fdffff         | push                dword ptr [ebp - 0x20c]
            //   ffd7                 | call                edi
            //   8bc8                 | mov                 ecx, eax
            //   8b85f4fdffff         | mov                 eax, dword ptr [ebp - 0x20c]
            //   33d2                 | xor                 edx, edx
            //   807c01fe3d           | cmp                 byte ptr [ecx + eax - 2], 0x3d

        $sequence_3 = { 8d85fcfeffff 68???????? 50 ffd6 80bdf5fdffff41 59 59 }
            // n = 7, score = 200
            //   8d85fcfeffff         | lea                 eax, [ebp - 0x104]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   80bdf5fdffff41       | cmp                 byte ptr [ebp - 0x20b], 0x41
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_4 = { 21442410 57 ff15???????? 59 8bd8 8b442410 69c030020000 }
            // n = 7, score = 200
            //   21442410             | and                 dword ptr [esp + 0x10], eax
            //   57                   | push                edi
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   8bd8                 | mov                 ebx, eax
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   69c030020000         | imul                eax, eax, 0x230

        $sequence_5 = { 3bc7 75f3 eb06 8b4908 894808 }
            // n = 5, score = 200
            //   3bc7                 | cmp                 eax, edi
            //   75f3                 | jne                 0xfffffff5
            //   eb06                 | jmp                 8
            //   8b4908               | mov                 ecx, dword ptr [ecx + 8]
            //   894808               | mov                 dword ptr [eax + 8], ecx

        $sequence_6 = { 5b ff75fc ff15???????? 5f d945f0 5e c9 }
            // n = 7, score = 200
            //   5b                   | pop                 ebx
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   d945f0               | fld                 dword ptr [ebp - 0x10]
            //   5e                   | pop                 esi
            //   c9                   | leave               

        $sequence_7 = { 8d4608 53 50 c706???????? 895e04 ff15???????? 8b3d???????? }
            // n = 7, score = 200
            //   8d4608               | lea                 eax, [esi + 8]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   c706????????         |                     
            //   895e04               | mov                 dword ptr [esi + 4], ebx
            //   ff15????????         |                     
            //   8b3d????????         |                     

        $sequence_8 = { 83c40c 6a40 8d8560ffffff 50 81c600030000 56 ffd7 }
            // n = 7, score = 200
            //   83c40c               | add                 esp, 0xc
            //   6a40                 | push                0x40
            //   8d8560ffffff         | lea                 eax, [ebp - 0xa0]
            //   50                   | push                eax
            //   81c600030000         | add                 esi, 0x300
            //   56                   | push                esi
            //   ffd7                 | call                edi

        $sequence_9 = { 57 8985dcfdffff 8d85dcfdffff 50 ffb5d0fdffff }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8985dcfdffff         | mov                 dword ptr [ebp - 0x224], eax
            //   8d85dcfdffff         | lea                 eax, [ebp - 0x224]
            //   50                   | push                eax
            //   ffb5d0fdffff         | push                dword ptr [ebp - 0x230]

    condition:
        7 of them and filesize < 360448
}