rule win_netsupportmanager_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.netsupportmanager_rat."
        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.netsupportmanager_rat"
        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 = { eb59 8bd6 83ea04 f7da 1bd2 83c104 81e240404000 }
            // n = 7, score = 100
            //   eb59                 | jmp                 0x5b
            //   8bd6                 | mov                 edx, esi
            //   83ea04               | sub                 edx, 4
            //   f7da                 | neg                 edx
            //   1bd2                 | sbb                 edx, edx
            //   83c104               | add                 ecx, 4
            //   81e240404000         | and                 edx, 0x404040

        $sequence_1 = { ff15???????? 50 ff15???????? 56 8b7508 6afc 56 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   6afc                 | push                -4
            //   56                   | push                esi

        $sequence_2 = { ff15???????? 85c0 7417 68???????? e8???????? 6800200000 e8???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7417                 | je                  0x19
            //   68????????           |                     
            //   e8????????           |                     
            //   6800200000           | push                0x2000
            //   e8????????           |                     

        $sequence_3 = { eb07 8b01 ff5010 8bd8 83fbff 750d 8b45e8 }
            // n = 7, score = 100
            //   eb07                 | jmp                 9
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff5010               | call                dword ptr [eax + 0x10]
            //   8bd8                 | mov                 ebx, eax
            //   83fbff               | cmp                 ebx, -1
            //   750d                 | jne                 0xf
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]

        $sequence_4 = { eb1f 8b4e10 8b560c 8d45fc 50 8b4608 51 }
            // n = 7, score = 100
            //   eb1f                 | jmp                 0x21
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   8b560c               | mov                 edx, dword ptr [esi + 0xc]
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   51                   | push                ecx

        $sequence_5 = { f7ea d1fa 8bf2 8bc2 c1ee1f 03c6 f6eb }
            // n = 7, score = 100
            //   f7ea                 | imul                edx
            //   d1fa                 | sar                 edx, 1
            //   8bf2                 | mov                 esi, edx
            //   8bc2                 | mov                 eax, edx
            //   c1ee1f               | shr                 esi, 0x1f
            //   03c6                 | add                 eax, esi
            //   f6eb                 | imul                bl

        $sequence_6 = { e8???????? 56 897e18 e8???????? 83c40c 5f 5e }
            // n = 7, score = 100
            //   e8????????           |                     
            //   56                   | push                esi
            //   897e18               | mov                 dword ptr [esi + 0x18], edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_7 = { e8???????? 8a4d0b 8a550b 6a18 c645fc02 884e58 885659 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8a4d0b               | mov                 cl, byte ptr [ebp + 0xb]
            //   8a550b               | mov                 dl, byte ptr [ebp + 0xb]
            //   6a18                 | push                0x18
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   884e58               | mov                 byte ptr [esi + 0x58], cl
            //   885659               | mov                 byte ptr [esi + 0x59], dl

        $sequence_8 = { 8bec 83ec10 8b450c 53 56 2d00020000 57 }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   83ec10               | sub                 esp, 0x10
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   2d00020000           | sub                 eax, 0x200
            //   57                   | push                edi

        $sequence_9 = { e8???????? 85c0 894510 7550 8b4d1c e8???????? 84c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   894510               | mov                 dword ptr [ebp + 0x10], eax
            //   7550                 | jne                 0x52
            //   8b4d1c               | mov                 ecx, dword ptr [ebp + 0x1c]
            //   e8????????           |                     
            //   84c0                 | test                al, al

    condition:
        7 of them and filesize < 4734976
}