rule win_badnews_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badnews"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { ff15???????? 50 e8???????? 83c404 68???????? 6804010000 ff15???????? }
            // n = 7, score = 700
            //   ff15????????         |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   68????????           |                     
            //   6804010000           | push                0x104
            //   ff15????????         |                     

        $sequence_1 = { 83e957 eb02 33c9 c0e004 }
            // n = 4, score = 700
            //   83e957               | sub                 ecx, 0x57
            //   eb02                 | jmp                 4
            //   33c9                 | xor                 ecx, ecx
            //   c0e004               | shl                 al, 4

        $sequence_2 = { 33c9 c0e004 02c1 3423 c0c003 }
            // n = 5, score = 700
            //   33c9                 | xor                 ecx, ecx
            //   c0e004               | shl                 al, 4
            //   02c1                 | add                 al, cl
            //   3423                 | xor                 al, 0x23
            //   c0c003               | rol                 al, 3

        $sequence_3 = { d1f9 68???????? 03c9 51 }
            // n = 4, score = 600
            //   d1f9                 | sar                 ecx, 1
            //   68????????           |                     
            //   03c9                 | add                 ecx, ecx
            //   51                   | push                ecx

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

        $sequence_5 = { c705????????33322e64 66c705????????6c6c c605????????00 ff15???????? }
            // n = 4, score = 600
            //   c705????????33322e64     |     
            //   66c705????????6c6c     |     
            //   c605????????00       |                     
            //   ff15????????         |                     

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

        $sequence_7 = { 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_8 = { ffd3 85c0 7403 83c608 8a06 }
            // n = 5, score = 600
            //   ffd3                 | call                ebx
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   83c608               | add                 esi, 8
            //   8a06                 | mov                 al, byte ptr [esi]

        $sequence_9 = { 8bf0 56 ff15???????? 50 6a40 }
            // n = 5, score = 600
            //   8bf0                 | mov                 esi, eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   50                   | push                eax
            //   6a40                 | push                0x40

        $sequence_10 = { f3a5 8bca 83e103 68???????? f3a4 50 }
            // n = 6, score = 300
            //   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_11 = { c1e706 8b049dd0a70110 0fbe443804 83e001 750d e8???????? }
            // n = 6, score = 100
            //   c1e706               | shl                 edi, 6
            //   8b049dd0a70110       | mov                 eax, dword ptr [ebx*4 + 0x1001a7d0]
            //   0fbe443804           | movsx               eax, byte ptr [eax + edi + 4]
            //   83e001               | and                 eax, 1
            //   750d                 | jne                 0xf
            //   e8????????           |                     

        $sequence_12 = { 75f8 8bca 8d8538fbffff c1e902 50 }
            // n = 5, score = 100
            //   75f8                 | jne                 0xfffffffa
            //   8bca                 | mov                 ecx, edx
            //   8d8538fbffff         | lea                 eax, [ebp - 0x4c8]
            //   c1e902               | shr                 ecx, 2
            //   50                   | push                eax

        $sequence_13 = { 0f84a1000000 8b55f4 8b0495d0a70110 f644180448 7452 6a0a 58 }
            // n = 7, score = 100
            //   0f84a1000000         | je                  0xa7
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   8b0495d0a70110       | mov                 eax, dword ptr [edx*4 + 0x1001a7d0]
            //   f644180448           | test                byte ptr [eax + ebx + 4], 0x48
            //   7452                 | je                  0x54
            //   6a0a                 | push                0xa
            //   58                   | pop                 eax

        $sequence_14 = { d1ee 50 8b45f4 56 ff75e4 8b0485d0a70110 }
            // n = 6, score = 100
            //   d1ee                 | shr                 esi, 1
            //   50                   | push                eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   56                   | push                esi
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   8b0485d0a70110       | mov                 eax, dword ptr [eax*4 + 0x1001a7d0]

        $sequence_15 = { 83e21f c1e206 031485d0a70110 eb05 ba???????? f6422480 }
            // n = 6, score = 100
            //   83e21f               | and                 edx, 0x1f
            //   c1e206               | shl                 edx, 6
            //   031485d0a70110       | add                 edx, dword ptr [eax*4 + 0x1001a7d0]
            //   eb05                 | jmp                 7
            //   ba????????           |                     
            //   f6422480             | test                byte ptr [edx + 0x24], 0x80

        $sequence_16 = { 75f3 8d8d54ffffff 49 8a4101 8d4901 84c0 75f6 }
            // n = 7, score = 100
            //   75f3                 | jne                 0xfffffff5
            //   8d8d54ffffff         | lea                 ecx, [ebp - 0xac]
            //   49                   | dec                 ecx
            //   8a4101               | mov                 al, byte ptr [ecx + 1]
            //   8d4901               | lea                 ecx, [ecx + 1]
            //   84c0                 | test                al, al
            //   75f6                 | jne                 0xfffffff8

        $sequence_17 = { 75e8 eb64 a1???????? 8b9c9d58fbffff 8945f0 66a1???????? }
            // n = 6, score = 100
            //   75e8                 | jne                 0xffffffea
            //   eb64                 | jmp                 0x66
            //   a1????????           |                     
            //   8b9c9d58fbffff       | mov                 ebx, dword ptr [ebp + ebx*4 - 0x4a8]
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   66a1????????         |                     

    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 )
}