rule win_evilgrab_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 0f842b010000 68???????? 8bcb e8???????? 50 6a01 68ff0f1f00 }
            // n = 7, score = 200
            //   0f842b010000         | je                  0x131
            //   68????????           |                     
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   50                   | push                eax
            //   6a01                 | push                1
            //   68ff0f1f00           | push                0x1f0fff

        $sequence_1 = { e8???????? 8b542414 83c404 33c9 8bf8 85d2 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   83c404               | add                 esp, 4
            //   33c9                 | xor                 ecx, ecx
            //   8bf8                 | mov                 edi, eax
            //   85d2                 | test                edx, edx

        $sequence_2 = { 83e103 f3a4 8b35???????? 8b95a4adffff 8bfa 83c9ff 33c0 }
            // n = 7, score = 200
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8b35????????         |                     
            //   8b95a4adffff         | mov                 edx, dword ptr [ebp - 0x525c]
            //   8bfa                 | mov                 edi, edx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 8b4528 8d1490 83c9ff 33c0 f2ae f7d1 2bf9 }
            // n = 7, score = 200
            //   8b4528               | mov                 eax, dword ptr [ebp + 0x28]
            //   8d1490               | lea                 edx, [eax + edx*4]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx

        $sequence_4 = { 68ff000000 e8???????? 8bf0 b93f000000 33c0 8bfe f3ab }
            // n = 7, score = 200
            //   68ff000000           | push                0xff
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   b93f000000           | mov                 ecx, 0x3f
            //   33c0                 | xor                 eax, eax
            //   8bfe                 | mov                 edi, esi
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_5 = { 741d 8b8d15ebffff 51 8b13 81c2f2000000 52 8b4b10 }
            // n = 7, score = 200
            //   741d                 | je                  0x1f
            //   8b8d15ebffff         | mov                 ecx, dword ptr [ebp - 0x14eb]
            //   51                   | push                ecx
            //   8b13                 | mov                 edx, dword ptr [ebx]
            //   81c2f2000000         | add                 edx, 0xf2
            //   52                   | push                edx
            //   8b4b10               | mov                 ecx, dword ptr [ebx + 0x10]

        $sequence_6 = { 8d7c2434 50 50 f3ab 8b4c2434 8d44243c 6800080000 }
            // n = 7, score = 200
            //   8d7c2434             | lea                 edi, [esp + 0x34]
            //   50                   | push                eax
            //   50                   | push                eax
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8b4c2434             | mov                 ecx, dword ptr [esp + 0x34]
            //   8d44243c             | lea                 eax, [esp + 0x3c]
            //   6800080000           | push                0x800

        $sequence_7 = { f7d1 49 51 68???????? 6a07 50 68???????? }
            // n = 7, score = 200
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   51                   | push                ecx
            //   68????????           |                     
            //   6a07                 | push                7
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_8 = { 50 ff15???????? c7431cffffffff c6431500 e9???????? 8b8d15ebffff 81e1ff000000 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   c7431cffffffff       | mov                 dword ptr [ebx + 0x1c], 0xffffffff
            //   c6431500             | mov                 byte ptr [ebx + 0x15], 0
            //   e9????????           |                     
            //   8b8d15ebffff         | mov                 ecx, dword ptr [ebp - 0x14eb]
            //   81e1ff000000         | and                 ecx, 0xff

        $sequence_9 = { ff4324 8b854cfeffff 50 ff15???????? ff45ec }
            // n = 5, score = 200
            //   ff4324               | inc                 dword ptr [ebx + 0x24]
            //   8b854cfeffff         | mov                 eax, dword ptr [ebp - 0x1b4]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   ff45ec               | inc                 dword ptr [ebp - 0x14]

    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
}