rule win_evilgrab_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.evilgrab."
        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.evilgrab"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 8bca 83e103 f3a4 8bb578adffff f68550d0ffff01 7434 bf???????? }
            // n = 7, score = 200
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8bb578adffff         | mov                 esi, dword ptr [ebp - 0x5288]
            //   f68550d0ffff01       | test                byte ptr [ebp - 0x2fb0], 1
            //   7434                 | je                  0x36
            //   bf????????           |                     

        $sequence_1 = { 89859cefffff 833f00 0f8e1f020000 8d5f10 8b35???????? }
            // n = 5, score = 200
            //   89859cefffff         | mov                 dword ptr [ebp - 0x1064], eax
            //   833f00               | cmp                 dword ptr [edi], 0
            //   0f8e1f020000         | jle                 0x225
            //   8d5f10               | lea                 ebx, [edi + 0x10]
            //   8b35????????         |                     

        $sequence_2 = { 8b442418 8bfd 8d4c0040 33c0 8bd1 c1e902 }
            // n = 6, score = 200
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   8bfd                 | mov                 edi, ebp
            //   8d4c0040             | lea                 ecx, [eax + eax + 0x40]
            //   33c0                 | xor                 eax, eax
            //   8bd1                 | mov                 edx, ecx
            //   c1e902               | shr                 ecx, 2

        $sequence_3 = { 8b7de4 8b4de8 8d4304 3bf0 7375 6a00 }
            // n = 6, score = 200
            //   8b7de4               | mov                 edi, dword ptr [ebp - 0x1c]
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   8d4304               | lea                 eax, [ebx + 4]
            //   3bf0                 | cmp                 esi, eax
            //   7375                 | jae                 0x77
            //   6a00                 | push                0

        $sequence_4 = { 83f810 772f 7420 48 7410 48 }
            // n = 6, score = 200
            //   83f810               | cmp                 eax, 0x10
            //   772f                 | ja                  0x31
            //   7420                 | je                  0x22
            //   48                   | dec                 eax
            //   7410                 | je                  0x12
            //   48                   | dec                 eax

        $sequence_5 = { e8???????? 8b5c2414 85c0 7508 53 8bce e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b5c2414             | mov                 ebx, dword ptr [esp + 0x14]
            //   85c0                 | test                eax, eax
            //   7508                 | jne                 0xa
            //   53                   | push                ebx
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     

        $sequence_6 = { 6a00 6a00 8d9570f5ffff 52 ff15???????? 6a00 }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d9570f5ffff         | lea                 edx, [ebp - 0xa90]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_7 = { 57 8d8de8adffff 51 8d95dcadffff 52 8d85e0adffff 50 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   8d8de8adffff         | lea                 ecx, [ebp - 0x5218]
            //   51                   | push                ecx
            //   8d95dcadffff         | lea                 edx, [ebp - 0x5224]
            //   52                   | push                edx
            //   8d85e0adffff         | lea                 eax, [ebp - 0x5220]
            //   50                   | push                eax

        $sequence_8 = { 894e20 51 8b4e1c 6a00 51 8b4e10 52 }
            // n = 7, score = 200
            //   894e20               | mov                 dword ptr [esi + 0x20], ecx
            //   51                   | push                ecx
            //   8b4e1c               | mov                 ecx, dword ptr [esi + 0x1c]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   52                   | push                edx

        $sequence_9 = { 807b1601 7516 8b4320 83f8ff 7407 50 }
            // n = 6, score = 200
            //   807b1601             | cmp                 byte ptr [ebx + 0x16], 1
            //   7516                 | jne                 0x18
            //   8b4320               | mov                 eax, dword ptr [ebx + 0x20]
            //   83f8ff               | cmp                 eax, -1
            //   7407                 | je                  9
            //   50                   | push                eax

    condition:
        7 of them and filesize < 327680
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

rule win_evilgrab_w0 {
    meta:
        description = "Vidgrab code tricks"
        author = "Seth Hardy"
        last_modified = "2014-06-20"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Vidgrab.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.evilgrab"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $divbyzero = { B8 02 00 00 00 48 48 BA 02 00 00 00 83 F2 02 F7 F0 }
        // add eax, ecx; xor byte ptr [eax], ??h; inc ecx
        $xorloop = { 03 C1 80 30 (66 | 58) 41 }
        $junk = { 8B 4? ?? 8B 4? ?? 03 45 08 52 5A }
        
    condition:
        all of them
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

rule win_evilgrab_w1 {
    meta:
        description = "Vidgrab Identifying Strings"
        author = "Seth Hardy"
        last_modified = "2014-06-20"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Vidgrab.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.evilgrab"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $s1 = "IDI_ICON5" wide ascii
        $s2 = "starter.exe"
        $s3 = "wmifw.exe"
        $s4 = "Software\\rar"
        $s5 = "tmp092.tmp"
        $s6 = "temp1.exe"
        
    condition:
       3 of them
}