rule win_evilgrab_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "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 = { 83e103 f3a4 8bca 51 50 8b9524cfffff 52 }
            // n = 7, score = 200
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8bca                 | mov                 ecx, edx
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8b9524cfffff         | mov                 edx, dword ptr [ebp - 0x30dc]
            //   52                   | push                edx

        $sequence_1 = { 8b45e0 83f801 0f8c33010000 8a4f04 84c9 0f8428010000 }
            // n = 6, score = 200
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   83f801               | cmp                 eax, 1
            //   0f8c33010000         | jl                  0x139
            //   8a4f04               | mov                 cl, byte ptr [edi + 4]
            //   84c9                 | test                cl, cl
            //   0f8428010000         | je                  0x12e

        $sequence_2 = { 68???????? 52 ffd7 83c408 c60000 }
            // n = 5, score = 200
            //   68????????           |                     
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   83c408               | add                 esp, 8
            //   c60000               | mov                 byte ptr [eax], 0

        $sequence_3 = { 6a2a 68???????? 8d8504f6ffff 50 ff15???????? 83c410 8d8d04f6ffff }
            // n = 7, score = 200
            //   6a2a                 | push                0x2a
            //   68????????           |                     
            //   8d8504f6ffff         | lea                 eax, [ebp - 0x9fc]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c410               | add                 esp, 0x10
            //   8d8d04f6ffff         | lea                 ecx, [ebp - 0x9fc]

        $sequence_4 = { 8b850cebffff 3dfc0f0000 0f87393b0000 85c0 0f847dfeffff c645fc03 9b }
            // n = 7, score = 200
            //   8b850cebffff         | mov                 eax, dword ptr [ebp - 0x14f4]
            //   3dfc0f0000           | cmp                 eax, 0xffc
            //   0f87393b0000         | ja                  0x3b3f
            //   85c0                 | test                eax, eax
            //   0f847dfeffff         | je                  0xfffffe83
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   9b                   | wait                

        $sequence_5 = { ff15???????? 83c408 85c0 75c2 8d8515ebffff 50 8bcb }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   75c2                 | jne                 0xffffffc4
            //   8d8515ebffff         | lea                 eax, [ebp - 0x14eb]
            //   50                   | push                eax
            //   8bcb                 | mov                 ecx, ebx

        $sequence_6 = { 0f8c33010000 8a4f04 84c9 0f8428010000 50 e8???????? 83c404 }
            // n = 7, score = 200
            //   0f8c33010000         | jl                  0x139
            //   8a4f04               | mov                 cl, byte ptr [edi + 4]
            //   84c9                 | test                cl, cl
            //   0f8428010000         | je                  0x12e
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_7 = { 6a28 8d45c4 50 e8???????? 83c41c c745ec28000000 83be0408000009 }
            // n = 7, score = 200
            //   6a28                 | push                0x28
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   c745ec28000000       | mov                 dword ptr [ebp - 0x14], 0x28
            //   83be0408000009       | cmp                 dword ptr [esi + 0x804], 9

        $sequence_8 = { 55 57 b941000000 33c0 8d7c2414 f3ab }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   57                   | push                edi
            //   b941000000           | mov                 ecx, 0x41
            //   33c0                 | xor                 eax, eax
            //   8d7c2414             | lea                 edi, [esp + 0x14]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_9 = { 5b 81c4902b0000 c20400 8b83c8020000 85c0 7464 8d93cc020000 }
            // n = 7, score = 200
            //   5b                   | pop                 ebx
            //   81c4902b0000         | add                 esp, 0x2b90
            //   c20400               | ret                 4
            //   8b83c8020000         | mov                 eax, dword ptr [ebx + 0x2c8]
            //   85c0                 | test                eax, eax
            //   7464                 | je                  0x66
            //   8d93cc020000         | lea                 edx, [ebx + 0x2cc]

    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
}