rule win_friedex_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.friedex."
        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.friedex"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { c20400 56 6a08 6a00 ff742410 8bf1 }
            // n = 6, score = 800
            //   c20400               | ret                 4
            //   56                   | push                esi
            //   6a08                 | push                8
            //   6a00                 | push                0
            //   ff742410             | push                dword ptr [esp + 0x10]
            //   8bf1                 | mov                 esi, ecx

        $sequence_1 = { 7403 53 ffd0 6880000000 33db }
            // n = 5, score = 800
            //   7403                 | je                  5
            //   53                   | push                ebx
            //   ffd0                 | call                eax
            //   6880000000           | push                0x80
            //   33db                 | xor                 ebx, ebx

        $sequence_2 = { 5f 6a3f 5b 6a02 897c2414 5d eb16 }
            // n = 7, score = 800
            //   5f                   | pop                 edi
            //   6a3f                 | push                0x3f
            //   5b                   | pop                 ebx
            //   6a02                 | push                2
            //   897c2414             | mov                 dword ptr [esp + 0x14], edi
            //   5d                   | pop                 ebp
            //   eb16                 | jmp                 0x18

        $sequence_3 = { 5a 663bfa 7408 8bce 8bc3 03f5 }
            // n = 6, score = 800
            //   5a                   | pop                 edx
            //   663bfa               | cmp                 di, dx
            //   7408                 | je                  0xa
            //   8bce                 | mov                 ecx, esi
            //   8bc3                 | mov                 eax, ebx
            //   03f5                 | add                 esi, ebp

        $sequence_4 = { 7405 663bf3 7534 03c5 03cd 0fb711 }
            // n = 6, score = 800
            //   7405                 | je                  7
            //   663bf3               | cmp                 si, bx
            //   7534                 | jne                 0x36
            //   03c5                 | add                 eax, ebp
            //   03cd                 | add                 ecx, ebp
            //   0fb711               | movzx               edx, word ptr [ecx]

        $sequence_5 = { 6a2f 8bc8 e8???????? 6a62 8bc8 }
            // n = 5, score = 800
            //   6a2f                 | push                0x2f
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   6a62                 | push                0x62
            //   8bc8                 | mov                 ecx, eax

        $sequence_6 = { 5d eb16 0fb730 663bf7 }
            // n = 4, score = 800
            //   5d                   | pop                 ebp
            //   eb16                 | jmp                 0x18
            //   0fb730               | movzx               esi, word ptr [eax]
            //   663bf7               | cmp                 si, di

        $sequence_7 = { 8bc8 e8???????? 57 8bc8 e8???????? 6a26 8bc8 }
            // n = 7, score = 800
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   57                   | push                edi
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   6a26                 | push                0x26
            //   8bc8                 | mov                 ecx, eax

        $sequence_8 = { e8???????? 8d0d0431a500 890424 894c2404 e8???????? }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8d0d0431a500         | lea                 ecx, [0xa53104]
            //   890424               | mov                 dword ptr [esp], eax
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   e8????????           |                     

        $sequence_9 = { 8a4daf 31d2 8a2c057530a500 83c001 38e9 8945a0 }
            // n = 6, score = 100
            //   8a4daf               | mov                 cl, byte ptr [ebp - 0x51]
            //   31d2                 | xor                 edx, edx
            //   8a2c057530a500       | mov                 ch, byte ptr [eax + 0xa53075]
            //   83c001               | add                 eax, 1
            //   38e9                 | cmp                 cl, ch
            //   8945a0               | mov                 dword ptr [ebp - 0x60], eax

        $sequence_10 = { e8???????? 8d0da030a500 890424 894c2404 e8???????? 8d0d4430a500 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8d0da030a500         | lea                 ecx, [0xa530a0]
            //   890424               | mov                 dword ptr [esp], eax
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   e8????????           |                     
            //   8d0d4430a500         | lea                 ecx, [0xa53044]

        $sequence_11 = { 894c2404 e8???????? 8d0d4430a500 31d2 8b75f8 894608 }
            // n = 6, score = 100
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   e8????????           |                     
            //   8d0d4430a500         | lea                 ecx, [0xa53044]
            //   31d2                 | xor                 edx, edx
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   894608               | mov                 dword ptr [esi + 8], eax

        $sequence_12 = { 89d0 8955c8 8945d0 74e4 31c0 8d0d5a23a500 8b55c8 }
            // n = 7, score = 100
            //   89d0                 | mov                 eax, edx
            //   8955c8               | mov                 dword ptr [ebp - 0x38], edx
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   74e4                 | je                  0xffffffe6
            //   31c0                 | xor                 eax, eax
            //   8d0d5a23a500         | lea                 ecx, [0xa5235a]
            //   8b55c8               | mov                 edx, dword ptr [ebp - 0x38]

        $sequence_13 = { 8b45e4 83c474 5f 5b 5e 5d c3 }
            // n = 7, score = 100
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   83c474               | add                 esp, 0x74
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_14 = { 57 56 83ec28 8b450c 8b4d08 8d155e30a500 83ec04 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   56                   | push                esi
            //   83ec28               | sub                 esp, 0x28
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8d155e30a500         | lea                 edx, [0xa5305e]
            //   83ec04               | sub                 esp, 4

        $sequence_15 = { 56 57 53 83ec54 8d055a23a500 31c9 8d55d8 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   53                   | push                ebx
            //   83ec54               | sub                 esp, 0x54
            //   8d055a23a500         | lea                 eax, [0xa5235a]
            //   31c9                 | xor                 ecx, ecx
            //   8d55d8               | lea                 edx, [ebp - 0x28]

    condition:
        7 of them and filesize < 204800
}

/*
# Copyright (C) 2019 Kevin O'Reilly (kevoreilly@gmail.com)
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

rule win_friedex_w0 {
    meta:
        author = "kevoreilly"
        description = "BitPaymer Payload"
        source = "https://github.com/ctxis/CAPE/blob/a67579f409828928005fc55cfdaae1b5199ea1db/data/yara/CAPE/BitPaymer.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.friedex"
        malpedia_version = "20200304"
        malpedia_sharing = "TLP:WHITE"
        malpedia_license = ""
    strings:
        $decrypt32 = {6A 40 58 3B C8 0F 4D C1 39 46 04 7D 50 53 57 8B F8 81 E7 3F 00 00 80 79 05 4F 83 CF C0 47 F7 DF 99 1B FF 83 E2 3F 03 C2 F7 DF C1 F8 06 03 F8 C1 E7 06 57}
        $antidefender = "TouchMeNot" wide
    condition:
        uint16(0) == 0x5A4D and all of them
}