rule win_xfsadm_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.xfsadm."
        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.xfsadm"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 80fb5f 0f8515010000 8b45fc 8b4804 8b81b0000000 }
            // n = 5, score = 100
            //   80fb5f               | cmp                 bl, 0x5f
            //   0f8515010000         | jne                 0x11b
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   8b81b0000000         | mov                 eax, dword ptr [ecx + 0xb0]

        $sequence_1 = { 0f8427010000 68???????? ff35???????? ffd6 a3???????? 85c0 0f840d010000 }
            // n = 7, score = 100
            //   0f8427010000         | je                  0x12d
            //   68????????           |                     
            //   ff35????????         |                     
            //   ffd6                 | call                esi
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f840d010000         | je                  0x113

        $sequence_2 = { 53 8bdf 3b7908 0f8306010000 8b01 a802 743c }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   8bdf                 | mov                 ebx, edi
            //   3b7908               | cmp                 edi, dword ptr [ecx + 8]
            //   0f8306010000         | jae                 0x10c
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   a802                 | test                al, 2
            //   743c                 | je                  0x3e

        $sequence_3 = { 897824 8d8528feffff 897e28 894708 68???????? 8d8d28feffff }
            // n = 6, score = 100
            //   897824               | mov                 dword ptr [eax + 0x24], edi
            //   8d8528feffff         | lea                 eax, [ebp - 0x1d8]
            //   897e28               | mov                 dword ptr [esi + 0x28], edi
            //   894708               | mov                 dword ptr [edi + 8], eax
            //   68????????           |                     
            //   8d8d28feffff         | lea                 ecx, [ebp - 0x1d8]

        $sequence_4 = { 8b4120 3bf0 7506 8b4024 894120 8b4e24 85c9 }
            // n = 7, score = 100
            //   8b4120               | mov                 eax, dword ptr [ecx + 0x20]
            //   3bf0                 | cmp                 esi, eax
            //   7506                 | jne                 8
            //   8b4024               | mov                 eax, dword ptr [eax + 0x24]
            //   894120               | mov                 dword ptr [ecx + 0x20], eax
            //   8b4e24               | mov                 ecx, dword ptr [esi + 0x24]
            //   85c9                 | test                ecx, ecx

        $sequence_5 = { 660ffec1 660f7e81f8fdffff 660f73d804 660f7e812cfeffff 660f73d804 660f7e8160feffff 660f73d804 }
            // n = 7, score = 100
            //   660ffec1             | paddd               xmm0, xmm1
            //   660f7e81f8fdffff     | movd                dword ptr [ecx - 0x208], xmm0
            //   660f73d804           | psrldq              xmm0, 4
            //   660f7e812cfeffff     | movd                dword ptr [ecx - 0x1d4], xmm0
            //   660f73d804           | psrldq              xmm0, 4
            //   660f7e8160feffff     | movd                dword ptr [ecx - 0x1a0], xmm0
            //   660f73d804           | psrldq              xmm0, 4

        $sequence_6 = { 6a0f 50 c605????????01 ff15???????? 68???????? 6a03 }
            // n = 6, score = 100
            //   6a0f                 | push                0xf
            //   50                   | push                eax
            //   c605????????01       |                     
            //   ff15????????         |                     
            //   68????????           |                     
            //   6a03                 | push                3

        $sequence_7 = { e8???????? 0f57c0 c78550feffff00000000 0f118530feffff 8d8594feffff 83c40c 0f118540feffff }
            // n = 7, score = 100
            //   e8????????           |                     
            //   0f57c0               | xorps               xmm0, xmm0
            //   c78550feffff00000000     | mov    dword ptr [ebp - 0x1b0], 0
            //   0f118530feffff       | movups              xmmword ptr [ebp - 0x1d0], xmm0
            //   8d8594feffff         | lea                 eax, [ebp - 0x16c]
            //   83c40c               | add                 esp, 0xc
            //   0f118540feffff       | movups              xmmword ptr [ebp - 0x1c0], xmm0

        $sequence_8 = { c20400 8d4e0c e8???????? 50 8bcf e8???????? 8a4e34 }
            // n = 7, score = 100
            //   c20400               | ret                 4
            //   8d4e0c               | lea                 ecx, [esi + 0xc]
            //   e8????????           |                     
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8a4e34               | mov                 cl, byte ptr [esi + 0x34]

        $sequence_9 = { 66c746740101 c6868a00000001 c6868c00000001 c686b400000001 c686ca00000001 c686cc00000001 8b86ec000000 }
            // n = 7, score = 100
            //   66c746740101         | mov                 word ptr [esi + 0x74], 0x101
            //   c6868a00000001       | mov                 byte ptr [esi + 0x8a], 1
            //   c6868c00000001       | mov                 byte ptr [esi + 0x8c], 1
            //   c686b400000001       | mov                 byte ptr [esi + 0xb4], 1
            //   c686ca00000001       | mov                 byte ptr [esi + 0xca], 1
            //   c686cc00000001       | mov                 byte ptr [esi + 0xcc], 1
            //   8b86ec000000         | mov                 eax, dword ptr [esi + 0xec]

    condition:
        7 of them and filesize < 566272
}

rule win_xfsadm_w0 {
    meta:
        description = "Detects ATM Malware XFSADM"
        author = "Frank Boldewin (@r3c0nst)"
        reference = "https://twitter.com/r3c0nst/status/1149043362244308992"
        date = "2019-06-21"
        hash1 = "2740bd2b7aa0eaa8de2135dd710eb669d4c4c91d29eefbf54f1b81165ad2da4d"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xfsadm"
        malpedia_version = "20190712"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $Code1 = {68 88 13 00 00 FF 35 ?? ?? ?? ?? 68 CF 00 00 00 50 FF 15} // Read Card Data
        $Code2 = {68 98 01 00 00 50 FF 15} // Get PIN Data
        $Mutex = "myXFSADM" nocase wide
        $MSXFSDIR = "C:\\Windows\\System32\\msxfs.dll" nocase ascii
        $XFSCommand1 = "WfsExecute" nocase ascii
        $XFSCommand2 = "WfsGetInfo" nocase ascii
        $PDB = "C:\\Work64\\ADM\\XFS\\Release\\XFS.pdb" nocase ascii
        $WindowName = "XFS ADM" nocase wide
        $FindWindow = "ADM rec" nocase wide
        $LogFile = "xfs.log" nocase ascii
        $TmpFile = "~pipe.tmp" nocase ascii

    condition:
        uint16(0) == 0x5A4D and filesize < 500KB and 4 of them
}