rule win_cerber_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.cerber."
        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.cerber"
        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 = { 83be0c01000000 7508 ff36 ff15???????? 899e14010000 eb06 89be14010000 }
            // n = 7, score = 1200
            //   83be0c01000000       | cmp                 dword ptr [esi + 0x10c], 0
            //   7508                 | jne                 0xa
            //   ff36                 | push                dword ptr [esi]
            //   ff15????????         |                     
            //   899e14010000         | mov                 dword ptr [esi + 0x114], ebx
            //   eb06                 | jmp                 8
            //   89be14010000         | mov                 dword ptr [esi + 0x114], edi

        $sequence_1 = { e8???????? 83c410 0bf0 8bc6 eb4f 8365f800 83c8ff }
            // n = 7, score = 1200
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   0bf0                 | or                  esi, eax
            //   8bc6                 | mov                 eax, esi
            //   eb4f                 | jmp                 0x51
            //   8365f800             | and                 dword ptr [ebp - 8], 0
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_2 = { b9b2000000 8bfb f3a5 8b4d0c 8bc3 e8???????? 8b450c }
            // n = 7, score = 1200
            //   b9b2000000           | mov                 ecx, 0xb2
            //   8bfb                 | mov                 edi, ebx
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8bc3                 | mov                 eax, ebx
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_3 = { 83f9ff 7407 49 898e10010000 6a00 ff36 ff15???????? }
            // n = 7, score = 1200
            //   83f9ff               | cmp                 ecx, -1
            //   7407                 | je                  9
            //   49                   | dec                 ecx
            //   898e10010000         | mov                 dword ptr [esi + 0x110], ecx
            //   6a00                 | push                0
            //   ff36                 | push                dword ptr [esi]
            //   ff15????????         |                     

        $sequence_4 = { ff15???????? f7d8 1bc0 f7d8 c3 85c0 741e }
            // n = 7, score = 1200
            //   ff15????????         |                     
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax
            //   c3                   | ret                 
            //   85c0                 | test                eax, eax
            //   741e                 | je                  0x20

        $sequence_5 = { 33c0 eb5a 8365e400 8365fc00 ff7508 8b3d???????? ffd7 }
            // n = 7, score = 1200
            //   33c0                 | xor                 eax, eax
            //   eb5a                 | jmp                 0x5c
            //   8365e400             | and                 dword ptr [ebp - 0x1c], 0
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8b3d????????         |                     
            //   ffd7                 | call                edi

        $sequence_6 = { 8bd8 d3eb 8b4d10 881c0a 4a 79e6 }
            // n = 6, score = 1200
            //   8bd8                 | mov                 ebx, eax
            //   d3eb                 | shr                 ebx, cl
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   881c0a               | mov                 byte ptr [edx + ecx], bl
            //   4a                   | dec                 edx
            //   79e6                 | jns                 0xffffffe8

        $sequence_7 = { e9???????? ff7528 8d8534fdffff 53 ff7520 ff751c ff7518 }
            // n = 7, score = 1200
            //   e9????????           |                     
            //   ff7528               | push                dword ptr [ebp + 0x28]
            //   8d8534fdffff         | lea                 eax, [ebp - 0x2cc]
            //   53                   | push                ebx
            //   ff7520               | push                dword ptr [ebp + 0x20]
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   ff7518               | push                dword ptr [ebp + 0x18]

    condition:
        7 of them and filesize < 573440
}