rule win_parallax_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.parallax."
        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.parallax"
        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 = { 681c800000 ff35???????? ff92e0010000 b800000000 5e 8be5 }
            // n = 6, score = 200
            //   681c800000           | push                0x801c
            //   ff35????????         |                     
            //   ff92e0010000         | call                dword ptr [edx + 0x1e0]
            //   b800000000           | mov                 eax, 0
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_1 = { 6a02 e8???????? 83f801 751a 6a01 68???????? 6a73 }
            // n = 7, score = 200
            //   6a02                 | push                2
            //   e8????????           |                     
            //   83f801               | cmp                 eax, 1
            //   751a                 | jne                 0x1c
            //   6a01                 | push                1
            //   68????????           |                     
            //   6a73                 | push                0x73

        $sequence_2 = { 64ff3500000000 64892500000000 8b450c 3dff000000 }
            // n = 4, score = 200
            //   64ff3500000000       | push                dword ptr fs:[0]
            //   64892500000000       | mov                 dword ptr fs:[0], esp
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   3dff000000           | cmp                 eax, 0xff

        $sequence_3 = { 8bec 83c4e4 8b7510 8b7d08 c745fc00000000 66c745fa0000 66c745f80000 }
            // n = 7, score = 200
            //   8bec                 | mov                 ebp, esp
            //   83c4e4               | add                 esp, -0x1c
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   66c745fa0000         | mov                 word ptr [ebp - 6], 0
            //   66c745f80000         | mov                 word ptr [ebp - 8], 0

        $sequence_4 = { 8b5508 03d0 eb01 4a 66833a5c 75f9 83c202 }
            // n = 7, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   03d0                 | add                 edx, eax
            //   eb01                 | jmp                 3
            //   4a                   | dec                 edx
            //   66833a5c             | cmp                 word ptr [edx], 0x5c
            //   75f9                 | jne                 0xfffffffb
            //   83c202               | add                 edx, 2

        $sequence_5 = { ff5750 837e3c00 740b 6808020000 ff763c ff5750 5e }
            // n = 7, score = 200
            //   ff5750               | call                dword ptr [edi + 0x50]
            //   837e3c00             | cmp                 dword ptr [esi + 0x3c], 0
            //   740b                 | je                  0xd
            //   6808020000           | push                0x208
            //   ff763c               | push                dword ptr [esi + 0x3c]
            //   ff5750               | call                dword ptr [edi + 0x50]
            //   5e                   | pop                 esi

        $sequence_6 = { 6a02 ff524c 85c0 0f85a5000000 8b15???????? ff75f8 6a00 }
            // n = 7, score = 200
            //   6a02                 | push                2
            //   ff524c               | call                dword ptr [edx + 0x4c]
            //   85c0                 | test                eax, eax
            //   0f85a5000000         | jne                 0xab
            //   8b15????????         |                     
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   6a00                 | push                0

        $sequence_7 = { 0375fc 56 e8???????? 83c004 8bc8 }
            // n = 5, score = 200
            //   0375fc               | add                 esi, dword ptr [ebp - 4]
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c004               | add                 eax, 4
            //   8bc8                 | mov                 ecx, eax

        $sequence_8 = { 68???????? ff97a4010000 6800200000 6a00 6a00 6a00 ff750c }
            // n = 7, score = 200
            //   68????????           |                     
            //   ff97a4010000         | call                dword ptr [edi + 0x1a4]
            //   6800200000           | push                0x2000
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_9 = { 6a00 ff7508 6815800000 ff35???????? ff96e0010000 5d }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   6815800000           | push                0x8015
            //   ff35????????         |                     
            //   ff96e0010000         | call                dword ptr [esi + 0x1e0]
            //   5d                   | pop                 ebp

    condition:
        7 of them and filesize < 352256
}

rule win_parallax_w0 {
    meta:
        author = "jeFF0Falltrades"
        source = "https://github.com/jeFF0Falltrades/IoCs/blob/master/Broadbased/parallax_rat.md"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.parallax"
        malpedia_version = "20200327"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $str_ws = ".DeleteFile(Wscript.ScriptFullName)" wide ascii
        $str_cb_1 = "Clipboard Start" wide ascii
        $str_cb_2 = "Clipboard End" wide ascii
        $str_un = "UN.vbs" wide ascii
        $hex_keylogger = { 64 24 ?? C0 CA FA }

    condition:
        3 of them
}