rule win_xfsadm_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 68???????? e8???????? 83c404 833d????????ff 7548 }
            // n = 5, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   833d????????ff       |                     
            //   7548                 | jne                 0x4a

        $sequence_1 = { 660ffec2 83c308 660f3840c1 660ffec3 660ffec1 660f7e8170feffff 660f73d804 }
            // n = 7, score = 100
            //   660ffec2             | paddd               xmm0, xmm2
            //   83c308               | add                 ebx, 8
            //   660f3840c1           | pmulld              xmm0, xmm1
            //   660ffec3             | paddd               xmm0, xmm3
            //   660ffec1             | paddd               xmm0, xmm1
            //   660f7e8170feffff     | movd                dword ptr [ecx - 0x190], xmm0
            //   660f73d804           | psrldq              xmm0, 4

        $sequence_2 = { 660ffec3 660ffec1 660f7e81c8feffff 660f73d804 660f7e81fcfeffff 660f73d804 660f7e8130ffffff }
            // n = 7, score = 100
            //   660ffec3             | paddd               xmm0, xmm3
            //   660ffec1             | paddd               xmm0, xmm1
            //   660f7e81c8feffff     | movd                dword ptr [ecx - 0x138], xmm0
            //   660f73d804           | psrldq              xmm0, 4
            //   660f7e81fcfeffff     | movd                dword ptr [ecx - 0x104], xmm0
            //   660f73d804           | psrldq              xmm0, 4
            //   660f7e8130ffffff     | movd                dword ptr [ecx - 0xd0], xmm0

        $sequence_3 = { 41 3d???????? 7cf1 eb1a 8d0449 }
            // n = 5, score = 100
            //   41                   | inc                 ecx
            //   3d????????           |                     
            //   7cf1                 | jl                  0xfffffff3
            //   eb1a                 | jmp                 0x1c
            //   8d0449               | lea                 eax, dword ptr [ecx + ecx*2]

        $sequence_4 = { 0f94c1 fec9 8b1485f8d84200 80e102 8a44172d }
            // n = 5, score = 100
            //   0f94c1               | sete                cl
            //   fec9                 | dec                 cl
            //   8b1485f8d84200       | mov                 edx, dword ptr [eax*4 + 0x42d8f8]
            //   80e102               | and                 cl, 2
            //   8a44172d             | mov                 al, byte ptr [edi + edx + 0x2d]

        $sequence_5 = { c1f806 6bc938 8b0485f8d84200 804c082820 8b75d8 b9000000c0 }
            // n = 6, score = 100
            //   c1f806               | sar                 eax, 6
            //   6bc938               | imul                ecx, ecx, 0x38
            //   8b0485f8d84200       | mov                 eax, dword ptr [eax*4 + 0x42d8f8]
            //   804c082820           | or                  byte ptr [eax + ecx + 0x28], 0x20
            //   8b75d8               | mov                 esi, dword ptr [ebp - 0x28]
            //   b9000000c0           | mov                 ecx, 0xc0000000

        $sequence_6 = { 8b04bdf8d84200 ff743018 ff15???????? 85c0 7404 b001 eb02 }
            // n = 7, score = 100
            //   8b04bdf8d84200       | mov                 eax, dword ptr [edi*4 + 0x42d8f8]
            //   ff743018             | push                dword ptr [eax + esi + 0x18]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7404                 | je                  6
            //   b001                 | mov                 al, 1
            //   eb02                 | jmp                 4

        $sequence_7 = { 0f84cb080000 e9???????? 56 6a02 e8???????? e8???????? 50 }
            // n = 7, score = 100
            //   0f84cb080000         | je                  0x8d1
            //   e9????????           |                     
            //   56                   | push                esi
            //   6a02                 | push                2
            //   e8????????           |                     
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_8 = { 8bec 8b4d08 33c0 3b0cc5480c4200 7427 40 }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   33c0                 | xor                 eax, eax
            //   3b0cc5480c4200       | cmp                 ecx, dword ptr [eax*8 + 0x420c48]
            //   7427                 | je                  0x29
            //   40                   | inc                 eax

        $sequence_9 = { a3???????? 85c0 0f84a5000000 68???????? ff35???????? ffd6 }
            // n = 6, score = 100
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84a5000000         | je                  0xab
            //   68????????           |                     
            //   ff35????????         |                     
            //   ffd6                 | call                esi

    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
}