rule win_xfsadm_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 84c9 7410 c60720 47 8a06 46 8807 }
            // n = 7, score = 100
            //   84c9                 | test                cl, cl
            //   7410                 | je                  0x12
            //   c60720               | mov                 byte ptr [edi], 0x20
            //   47                   | inc                 edi
            //   8a06                 | mov                 al, byte ptr [esi]
            //   46                   | inc                 esi
            //   8807                 | mov                 byte ptr [edi], al

        $sequence_1 = { 8975cc 8975d0 8975e0 8d1c85fcffffff c745e4d8254200 }
            // n = 5, score = 100
            //   8975cc               | mov                 dword ptr [ebp - 0x34], esi
            //   8975d0               | mov                 dword ptr [ebp - 0x30], esi
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8d1c85fcffffff       | lea                 ebx, [eax*4 - 4]
            //   c745e4d8254200       | mov                 dword ptr [ebp - 0x1c], 0x4225d8

        $sequence_2 = { 6a00 ffd7 85c0 740c 6a00 6a00 }
            // n = 6, score = 100
            //   6a00                 | push                0
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   740c                 | je                  0xe
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_3 = { 6a26 58 0fb60c858e174200 0fb634858f174200 8bf9 8985b0f8ffff c1e702 }
            // n = 7, score = 100
            //   6a26                 | push                0x26
            //   58                   | pop                 eax
            //   0fb60c858e174200     | movzx               ecx, byte ptr [eax*4 + 0x42178e]
            //   0fb634858f174200     | movzx               esi, byte ptr [eax*4 + 0x42178f]
            //   8bf9                 | mov                 edi, ecx
            //   8985b0f8ffff         | mov                 dword ptr [ebp - 0x750], eax
            //   c1e702               | shl                 edi, 2

        $sequence_4 = { e8???????? 83c414 57 e8???????? a1???????? 83c404 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   57                   | push                edi
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_5 = { e8???????? 68f80f0000 8bf8 6a00 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   68f80f0000           | push                0xff8
            //   8bf8                 | mov                 edi, eax
            //   6a00                 | push                0

        $sequence_6 = { 75d3 8b4d08 ff7718 6a00 51 8b4f04 6a0a }
            // n = 7, score = 100
            //   75d3                 | jne                 0xffffffd5
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   ff7718               | push                dword ptr [edi + 0x18]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   8b4f04               | mov                 ecx, dword ptr [edi + 4]
            //   6a0a                 | push                0xa

        $sequence_7 = { 57 6a00 6a00 6a00 6a00 6a00 680cfeffff }
            // n = 7, score = 100
            //   57                   | push                edi
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   680cfeffff           | push                0xfffffe0c

        $sequence_8 = { ff5008 8bd0 c702???????? 8b45fc 8b4d0c 894204 }
            // n = 6, score = 100
            //   ff5008               | call                dword ptr [eax + 8]
            //   8bd0                 | mov                 edx, eax
            //   c702????????         |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   894204               | mov                 dword ptr [edx + 4], eax

        $sequence_9 = { c7463800000000 8d4608 c7463c00000000 c7464000000000 c7464400000000 c7464800000000 }
            // n = 6, score = 100
            //   c7463800000000       | mov                 dword ptr [esi + 0x38], 0
            //   8d4608               | lea                 eax, [esi + 8]
            //   c7463c00000000       | mov                 dword ptr [esi + 0x3c], 0
            //   c7464000000000       | mov                 dword ptr [esi + 0x40], 0
            //   c7464400000000       | mov                 dword ptr [esi + 0x44], 0
            //   c7464800000000       | mov                 dword ptr [esi + 0x48], 0

    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
}