SYMBOLCOMMON_NAMEaka. SYNONYMS
win.dispenserxfs (Back to overview)

DispenserXFS


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References
2019-02-28Twitter (@cyb3rops)Florian Roth
@online{roth:20190228:yara:d1c9185, author = {Florian Roth}, title = {{Tweet on YARA and DispenserXFS}}, date = {2019-02-28}, organization = {Twitter (@cyb3rops)}, url = {https://twitter.com/cyb3rops/status/1101138784933085191}, language = {English}, urldate = {2020-01-10} } Tweet on YARA and DispenserXFS
DispenserXFS
Yara Rules
[TLP:WHITE] win_dispenserxfs_auto (20220808 | Detects win.dispenserxfs.)
rule win_dispenserxfs_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.dispenserxfs."
        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.dispenserxfs"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 85c0 740f 8d8df4fbffff e8???????? 85c0 7517 8b4dfc }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   740f                 | je                  0x11
            //   8d8df4fbffff         | lea                 ecx, [ebp - 0x40c]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7517                 | jne                 0x19
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_1 = { ffd6 68???????? 6a05 58 50 8d8550ffffff }
            // n = 6, score = 200
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   6a05                 | push                5
            //   58                   | pop                 eax
            //   50                   | push                eax
            //   8d8550ffffff         | lea                 eax, [ebp - 0xb0]

        $sequence_2 = { 6811010000 ff35???????? ff15???????? 8b35???????? eb14 8d45e4 50 }
            // n = 7, score = 200
            //   6811010000           | push                0x111
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   eb14                 | jmp                 0x16
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax

        $sequence_3 = { c745d406000000 c745dc34634000 ffd6 8d4db4 }
            // n = 4, score = 200
            //   c745d406000000       | mov                 dword ptr [ebp - 0x2c], 6
            //   c745dc34634000       | mov                 dword ptr [ebp - 0x24], 0x406334
            //   ffd6                 | call                esi
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]

        $sequence_4 = { 8b5de4 8b5508 33c0 6a64 }
            // n = 4, score = 200
            //   8b5de4               | mov                 ebx, dword ptr [ebp - 0x1c]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   33c0                 | xor                 eax, eax
            //   6a64                 | push                0x64

        $sequence_5 = { 89b504ffffff 6689850affffff 89950cffffff 33c0 }
            // n = 4, score = 200
            //   89b504ffffff         | mov                 dword ptr [ebp - 0xfc], esi
            //   6689850affffff       | mov                 word ptr [ebp - 0xf6], ax
            //   89950cffffff         | mov                 dword ptr [ebp - 0xf4], edx
            //   33c0                 | xor                 eax, eax

        $sequence_6 = { 898530fdffff 8d85c8feffff 898534fdffff 8d8508ffffff 898538fdffff }
            // n = 5, score = 200
            //   898530fdffff         | mov                 dword ptr [ebp - 0x2d0], eax
            //   8d85c8feffff         | lea                 eax, [ebp - 0x138]
            //   898534fdffff         | mov                 dword ptr [ebp - 0x2cc], eax
            //   8d8508ffffff         | lea                 eax, [ebp - 0xf8]
            //   898538fdffff         | mov                 dword ptr [ebp - 0x2c8], eax

        $sequence_7 = { ff15???????? 2b45fc 3de0930400 774a 68???????? e8???????? }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   2b45fc               | sub                 eax, dword ptr [ebp - 4]
            //   3de0930400           | cmp                 eax, 0x493e0
            //   774a                 | ja                  0x4c
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_8 = { 668b4508 894df6 895109 8b4df6 66894107 }
            // n = 5, score = 200
            //   668b4508             | mov                 ax, word ptr [ebp + 8]
            //   894df6               | mov                 dword ptr [ebp - 0xa], ecx
            //   895109               | mov                 dword ptr [ecx + 9], edx
            //   8b4df6               | mov                 ecx, dword ptr [ebp - 0xa]
            //   66894107             | mov                 word ptr [ecx + 7], ax

        $sequence_9 = { 8bf2 6a7e 50 6689857cffffff }
            // n = 4, score = 200
            //   8bf2                 | mov                 esi, edx
            //   6a7e                 | push                0x7e
            //   50                   | push                eax
            //   6689857cffffff       | mov                 word ptr [ebp - 0x84], ax

    condition:
        7 of them and filesize < 114688
}
[TLP:WHITE] win_dispenserxfs_w0   (20190307 | Detects ATM Malware DispenserXFS)
import "pe"

rule win_dispenserxfs_w0 {
    meta:
        description = "Detects ATM Malware DispenserXFS"
        author = "@Xylit0l @r3c0nst / Modified by Florian Roth"
        reference = "https://twitter.com/r3c0nst/status/1100775857306652673"
        date = "2019/02/27"
        score = 80
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dispenserxfs"
        malpedia_version = "20190307"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $xc1 = { 68 FF FF 00 00 68 60 EA 00 00 6A 10 }
        $s1 = "\\dispenserXFS.pdb" ascii wide
        $s3 = "C:\\xfsasdf.txt" fullword ascii
        $s4 = "Injected mxsfs killer into %d." fullword ascii
        $s5 = "Waiting for freeze msxfs processes..." fullword ascii

    condition:
        1 of them or pe.imphash() == "617e037ae26d1931818db0790fb44bfe"
}
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