rule win_arkei_stealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.arkei_stealer."
        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.arkei_stealer"
        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 = { 8d448a0e 6a00 8d4de4 51 6a0e 8d55ec }
            // n = 6, score = 400
            //   8d448a0e             | lea                 eax, [edx + ecx*4 + 0xe]
            //   6a00                 | push                0
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   51                   | push                ecx
            //   6a0e                 | push                0xe
            //   8d55ec               | lea                 edx, [ebp - 0x14]

        $sequence_1 = { 56 894590 ff15???????? 8bf8 897d94 83ffff }
            // n = 6, score = 400
            //   56                   | push                esi
            //   894590               | mov                 dword ptr [ebp - 0x70], eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   897d94               | mov                 dword ptr [ebp - 0x6c], edi
            //   83ffff               | cmp                 edi, -1

        $sequence_2 = { 668b4dd6 66894e0e 6683fb18 730c ba01000000 8acb d3e2 }
            // n = 7, score = 400
            //   668b4dd6             | mov                 cx, word ptr [ebp - 0x2a]
            //   66894e0e             | mov                 word ptr [esi + 0xe], cx
            //   6683fb18             | cmp                 bx, 0x18
            //   730c                 | jae                 0xe
            //   ba01000000           | mov                 edx, 1
            //   8acb                 | mov                 cl, bl
            //   d3e2                 | shl                 edx, cl

        $sequence_3 = { 6a00 8d45e4 50 56 53 57 }
            // n = 6, score = 400
            //   6a00                 | push                0
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   56                   | push                esi
            //   53                   | push                ebx
            //   57                   | push                edi

        $sequence_4 = { 51 50 6a00 6a00 ff15???????? 50 8945fc }
            // n = 7, score = 400
            //   51                   | push                ecx
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_5 = { 51 6a00 ffd6 8b55e8 52 6a00 ffd6 }
            // n = 7, score = 400
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   ffd6                 | call                esi
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   52                   | push                edx
            //   6a00                 | push                0
            //   ffd6                 | call                esi

        $sequence_6 = { 57 ff15???????? 8945e0 85c0 7513 33c0 5f }
            // n = 7, score = 400
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   85c0                 | test                eax, eax
            //   7513                 | jne                 0x15
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi

        $sequence_7 = { 8b00 50 ff15???????? 83f8ff 740b a810 7507 }
            // n = 7, score = 400
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   740b                 | je                  0xd
            //   a810                 | test                al, 0x10
            //   7507                 | jne                 9

        $sequence_8 = { 0fb7cb c1f803 0fafc1 0faf4608 33ff }
            // n = 5, score = 400
            //   0fb7cb               | movzx               ecx, bx
            //   c1f803               | sar                 eax, 3
            //   0fafc1               | imul                eax, ecx
            //   0faf4608             | imul                eax, dword ptr [esi + 8]
            //   33ff                 | xor                 edi, edi

        $sequence_9 = { 33d2 894dee 8955f2 8b4e20 }
            // n = 4, score = 400
            //   33d2                 | xor                 edx, edx
            //   894dee               | mov                 dword ptr [ebp - 0x12], ecx
            //   8955f2               | mov                 dword ptr [ebp - 0xe], edx
            //   8b4e20               | mov                 ecx, dword ptr [esi + 0x20]

    condition:
        7 of them and filesize < 1744896
}

rule win_arkei_stealer_w0 {
    meta:
        author = "Fumik0_"
        description = "Arkei Stealer"
        Date = "2018/07/10"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.arkei_stealer"
        malpedia_version = "20181023"
        malpedia_sharing = "TLP:WHITE"
        malpedia_license = ""
 
    strings:
        $s1 = "Arkei" wide ascii
        $s2 = "/server/gate" wide ascii
        $s3 = "/server/grubConfig" wide ascii
        $s4 = "\\files\\" wide ascii
        $s5 = "SQLite" wide ascii
 
    condition:
        all of ($s*)   
}