rule win_fobber_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.fobber."
        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.fobber"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 0fb066f5 75f6 66b80100 660fc146f9 }
            // n = 4, score = 1100
            //   0fb066f5             | cmpxchg             byte ptr [esi - 0xb], ah
            //   75f6                 | jne                 0xfffffff8
            //   66b80100             | mov                 ax, 1
            //   660fc146f9           | xadd                word ptr [esi - 7], ax

        $sequence_1 = { 740f 8d4d08 51 ff31 ffd0 }
            // n = 5, score = 1100
            //   740f                 | je                  0x11
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   51                   | push                ecx
            //   ff31                 | push                dword ptr [ecx]
            //   ffd0                 | call                eax

        $sequence_2 = { 89e5 ff750c 6800300000 ff7508 }
            // n = 4, score = 1100
            //   89e5                 | mov                 ebp, esp
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   6800300000           | push                0x3000
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_3 = { 7607 49 01cf 01ce 41 }
            // n = 5, score = 1100
            //   7607                 | jbe                 9
            //   49                   | dec                 ecx
            //   01cf                 | add                 edi, ecx
            //   01ce                 | add                 esi, ecx
            //   41                   | inc                 ecx

        $sequence_4 = { 8b750c 8b4d10 39f7 760e }
            // n = 4, score = 1100
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   39f7                 | cmp                 edi, esi
            //   760e                 | jbe                 0x10

        $sequence_5 = { ff7510 ff750c ff7508 e8???????? 85c0 7407 50 }
            // n = 7, score = 1100
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   50                   | push                eax

        $sequence_6 = { 760e 8d0431 39f8 7607 49 }
            // n = 5, score = 1100
            //   760e                 | jbe                 0x10
            //   8d0431               | lea                 eax, [ecx + esi]
            //   39f8                 | cmp                 eax, edi
            //   7607                 | jbe                 9
            //   49                   | dec                 ecx

        $sequence_7 = { 31c9 f7d1 fc f2ae f7d1 49 89c8 }
            // n = 7, score = 1100
            //   31c9                 | xor                 ecx, ecx
            //   f7d1                 | not                 ecx
            //   fc                   | cld                 
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   89c8                 | mov                 eax, ecx

        $sequence_8 = { 05b05ec972 0100 0000 6a08 e8???????? 59 }
            // n = 6, score = 100
            //   05b05ec972           | add                 eax, 0x72c95eb0
            //   0100                 | add                 dword ptr [eax], eax
            //   0000                 | add                 byte ptr [eax], al
            //   6a08                 | push                8
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_9 = { 38d7 6a00 bc711fb37c 0474 04f0 }
            // n = 5, score = 100
            //   38d7                 | cmp                 bh, dl
            //   6a00                 | push                0
            //   bc711fb37c           | mov                 esp, 0x7cb31f71
            //   0474                 | add                 al, 0x74
            //   04f0                 | add                 al, 0xf0

        $sequence_10 = { c072e458 c072c458 c072a458 c0728458 }
            // n = 4, score = 100
            //   c072e458             | sal                 byte ptr [edx - 0x1c], 0x58
            //   c072c458             | sal                 byte ptr [edx - 0x3c], 0x58
            //   c072a458             | sal                 byte ptr [edx - 0x5c], 0x58
            //   c0728458             | sal                 byte ptr [edx - 0x7c], 0x58

        $sequence_11 = { 3bd6 7409 668b08 66890a 83c202 ff07 6a22 }
            // n = 7, score = 100
            //   3bd6                 | cmp                 edx, esi
            //   7409                 | je                  0xb
            //   668b08               | mov                 cx, word ptr [eax]
            //   66890a               | mov                 word ptr [edx], cx
            //   83c202               | add                 edx, 2
            //   ff07                 | inc                 dword ptr [edi]
            //   6a22                 | push                0x22

        $sequence_12 = { 6802000080 ff15???????? 8d45f8 50 68???????? 6805000080 }
            // n = 6, score = 100
            //   6802000080           | push                0x80000002
            //   ff15????????         |                     
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   68????????           |                     
            //   6805000080           | push                0x80000005

        $sequence_13 = { ebd8 8bff 55 8bec 837d0800 56 8bf1 }
            // n = 7, score = 100
            //   ebd8                 | jmp                 0xffffffda
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx

        $sequence_14 = { 6300 0081efe2c5fe ff81c7c34c00 0081efc52500 0081efb55100 0081ef272400 }
            // n = 6, score = 100
            //   6300                 | arpl                word ptr [eax], ax
            //   0081efe2c5fe         | add                 byte ptr [ecx - 0x13a1d11], al
            //   ff81c7c34c00         | inc                 dword ptr [ecx + 0x4cc3c7]
            //   0081efc52500         | add                 byte ptr [ecx + 0x25c5ef], al
            //   0081efb55100         | add                 byte ptr [ecx + 0x51b5ef], al
            //   0081ef272400         | add                 byte ptr [ecx + 0x2427ef], al

        $sequence_15 = { 81c6e9140000 81eefa360000 81eef8e4ffff 81c6507c0000 81eeb77a0000 81ee0b690000 81c6cf450000 }
            // n = 7, score = 100
            //   81c6e9140000         | add                 esi, 0x14e9
            //   81eefa360000         | sub                 esi, 0x36fa
            //   81eef8e4ffff         | sub                 esi, 0xffffe4f8
            //   81c6507c0000         | add                 esi, 0x7c50
            //   81eeb77a0000         | sub                 esi, 0x7ab7
            //   81ee0b690000         | sub                 esi, 0x690b
            //   81c6cf450000         | add                 esi, 0x45cf

    condition:
        7 of them and filesize < 188416
}