rule win_badnews_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badnews"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 83c404 68???????? 6804010000 ff15???????? }
            // n = 4, score = 700
            //   83c404               | add                 esp, 4
            //   68????????           |                     
            //   6804010000           | push                0x104
            //   ff15????????         |                     

        $sequence_1 = { eb02 33c9 c0e004 02c1 3423 }
            // n = 5, score = 700
            //   eb02                 | jmp                 4
            //   33c9                 | xor                 ecx, ecx
            //   c0e004               | shl                 al, 4
            //   02c1                 | add                 al, cl
            //   3423                 | xor                 al, 0x23

        $sequence_2 = { 55 8bec 8b450c 3d01020000 }
            // n = 4, score = 600
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   3d01020000           | cmp                 eax, 0x201

        $sequence_3 = { ffd3 85c0 7403 83c608 }
            // n = 4, score = 600
            //   ffd3                 | call                ebx
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   83c608               | add                 esi, 8

        $sequence_4 = { c745806e000000 ff15???????? 57 ff15???????? }
            // n = 4, score = 600
            //   c745806e000000       | mov                 dword ptr [ebp - 0x80], 0x6e
            //   ff15????????         |                     
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_5 = { a1???????? 33c5 8945fc 53 56 57 8d8534ffffff }
            // n = 7, score = 600
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d8534ffffff         | lea                 eax, [ebp - 0xcc]

        $sequence_6 = { ff15???????? 85c0 7405 83c004 }
            // n = 4, score = 600
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7
            //   83c004               | add                 eax, 4

        $sequence_7 = { 8bf0 56 ff15???????? 50 6a40 ff15???????? }
            // n = 6, score = 600
            //   8bf0                 | mov                 esi, eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   50                   | push                eax
            //   6a40                 | push                0x40
            //   ff15????????         |                     

        $sequence_8 = { 57 6a00 6880000000 6a04 6a00 6a01 6a04 }
            // n = 7, score = 600
            //   57                   | push                edi
            //   6a00                 | push                0
            //   6880000000           | push                0x80
            //   6a04                 | push                4
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   6a04                 | push                4

        $sequence_9 = { d1f9 68???????? 03c9 51 }
            // n = 4, score = 600
            //   d1f9                 | sar                 ecx, 1
            //   68????????           |                     
            //   03c9                 | add                 ecx, ecx
            //   51                   | push                ecx

        $sequence_10 = { 6685d2 75f5 2bcf 6a00 d1f9 }
            // n = 5, score = 500
            //   6685d2               | test                dx, dx
            //   75f5                 | jne                 0xfffffff7
            //   2bcf                 | sub                 ecx, edi
            //   6a00                 | push                0
            //   d1f9                 | sar                 ecx, 1

        $sequence_11 = { c1e902 f3a5 8bca 83e103 68???????? f3a4 50 }
            // n = 7, score = 300
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3
            //   68????????           |                     
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   50                   | push                eax

        $sequence_12 = { e8???????? a1???????? 8985f0feffff a1???????? 6a5c 8985f4feffff 8d85f8feffff }
            // n = 7, score = 100
            //   e8????????           |                     
            //   a1????????           |                     
            //   8985f0feffff         | mov                 dword ptr [ebp - 0x110], eax
            //   a1????????           |                     
            //   6a5c                 | push                0x5c
            //   8985f4feffff         | mov                 dword ptr [ebp - 0x10c], eax
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]

        $sequence_13 = { 84c0 75f9 8dbd2cfdffff 2bd6 4f }
            // n = 5, score = 100
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb
            //   8dbd2cfdffff         | lea                 edi, [ebp - 0x2d4]
            //   2bd6                 | sub                 edx, esi
            //   4f                   | dec                 edi

        $sequence_14 = { 899d54fbffff e8???????? 53 e8???????? 6a00 6a00 53 }
            // n = 7, score = 100
            //   899d54fbffff         | mov                 dword ptr [ebp - 0x4ac], ebx
            //   e8????????           |                     
            //   53                   | push                ebx
            //   e8????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   53                   | push                ebx

        $sequence_15 = { c7466848960110 83a6b803000000 6a0d e8???????? 59 8365fc00 }
            // n = 6, score = 100
            //   c7466848960110       | mov                 dword ptr [esi + 0x68], 0x10019648
            //   83a6b803000000       | and                 dword ptr [esi + 0x3b8], 0
            //   6a0d                 | push                0xd
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8365fc00             | and                 dword ptr [ebp - 4], 0

        $sequence_16 = { 56 ff75e4 8b0485d0a70110 ff3418 ff15???????? 85c0 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   8b0485d0a70110       | mov                 eax, dword ptr [eax*4 + 0x1001a7d0]
            //   ff3418               | push                dword ptr [eax + ebx]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_17 = { 6a00 50 f30f7f85c4fdffff e8???????? a1???????? f30f7e05???????? }
            // n = 6, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   f30f7f85c4fdffff     | movdqu              xmmword ptr [ebp - 0x23c], xmm0
            //   e8????????           |                     
            //   a1????????           |                     
            //   f30f7e05????????     |                     

        $sequence_18 = { eba9 8b0c95d0a70110 8a441904 a840 7508 }
            // n = 5, score = 100
            //   eba9                 | jmp                 0xffffffab
            //   8b0c95d0a70110       | mov                 ecx, dword ptr [edx*4 + 0x1001a7d0]
            //   8a441904             | mov                 al, byte ptr [ecx + ebx + 4]
            //   a840                 | test                al, 0x40
            //   7508                 | jne                 0xa

    condition:
        7 of them and filesize < 466944
}

import "pe"

rule win_badnews_w0 {
    meta:
        author = "Florian Roth"
        reference = "http://blog.fortinet.com/2017/04/05/in-depth-look-at-new-variant-of-monsoon-apt-backdoor-part-2"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badnews"
        malpedia_version = "20180301"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $x1 = "\\Microsoft\\Windows\\coco.exe" fullword ascii
        $x2 = ":\\System Volume Information\\config" fullword ascii
        $x3 = " cscript.[BACKSPA[PAGE DO[CAPS LO[PAGE UPTPX498.dTPX499.d" fullword wide

        $s1 = "\\Microsoft\\Templates\\msvcrt.dll" fullword ascii
        $s2 = "%04d/%02d/%02d %02d:%02d:%02d - {%s}" fullword wide
        $s3 = "wininet.dll    " fullword ascii
        $s4 = "DMCZ0001.dat" fullword ascii
        $s5 = "TZ0000001.dat" fullword ascii
        $s6 = "\\MUT.dat" fullword ascii
        $s7 = "ouemm/emm!!!!!!!!!!!!!" fullword ascii
    condition:
        ( 1 of ($x*) or 3 of them )
}