SYMBOLCOMMON_NAMEaka. SYNONYMS
win.udpos (Back to overview)

UDPoS


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References
2018-02-08ForcepointRobert Neumann, Luke Somerville
@online{neumann:20180208:udpos:57b42e3, author = {Robert Neumann and Luke Somerville}, title = {{UDPoS - exfiltrating credit card data via DNS}}, date = {2018-02-08}, organization = {Forcepoint}, url = {https://www.forcepoint.com/blog/x-labs/udpos-exfiltrating-credit-card-data-dns}, language = {English}, urldate = {2019-11-25} } UDPoS - exfiltrating credit card data via DNS
UDPoS
Yara Rules
[TLP:WHITE] win_udpos_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_udpos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.udpos"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 8b4704 8b4f08 8b770c 8b7f10 897dfc }
            // n = 5, score = 100
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   8b4f08               | mov                 ecx, dword ptr [edi + 8]
            //   8b770c               | mov                 esi, dword ptr [edi + 0xc]
            //   8b7f10               | mov                 edi, dword ptr [edi + 0x10]
            //   897dfc               | mov                 dword ptr [ebp - 4], edi

        $sequence_1 = { 51 8d95b4f7ffff 52 66898c4568f3ffff e8???????? a1???????? 83c40c }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   8d95b4f7ffff         | lea                 edx, [ebp - 0x84c]
            //   52                   | push                edx
            //   66898c4568f3ffff     | mov                 word ptr [ebp + eax*2 - 0xc98], cx
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_2 = { 6a00 51 e8???????? 68e8030000 8d951cefffff }
            // n = 5, score = 100
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     
            //   68e8030000           | push                0x3e8
            //   8d951cefffff         | lea                 edx, [ebp - 0x10e4]

        $sequence_3 = { 8d8d1cefffff 51 ffd6 8d951cefffff 52 }
            // n = 5, score = 100
            //   8d8d1cefffff         | lea                 ecx, [ebp - 0x10e4]
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   8d951cefffff         | lea                 edx, [ebp - 0x10e4]
            //   52                   | push                edx

        $sequence_4 = { a1???????? a3???????? a1???????? c705????????405f4000 8935???????? a3???????? ff15???????? }
            // n = 7, score = 100
            //   a1????????           |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   c705????????405f4000     |     
            //   8935????????         |                     
            //   a3????????           |                     
            //   ff15????????         |                     

        $sequence_5 = { e8???????? 68???????? be26000000 a3???????? e8???????? 68???????? be24000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   68????????           |                     
            //   be26000000           | mov                 esi, 0x26
            //   a3????????           |                     
            //   e8????????           |                     
            //   68????????           |                     
            //   be24000000           | mov                 esi, 0x24

        $sequence_6 = { 8bff 660fbe1431 6689944d5cf5ffff 41 3bc8 7cee 33c9 }
            // n = 7, score = 100
            //   8bff                 | mov                 edi, edi
            //   660fbe1431           | movsx               dx, byte ptr [ecx + esi]
            //   6689944d5cf5ffff     | mov                 word ptr [ebp + ecx*2 - 0xaa4], dx
            //   41                   | inc                 ecx
            //   3bc8                 | cmp                 ecx, eax
            //   7cee                 | jl                  0xfffffff0
            //   33c9                 | xor                 ecx, ecx

        $sequence_7 = { 83ff3c 7d6d 8b5d0c 8d5cbbc8 895df4 bb3c000000 2bdf }
            // n = 7, score = 100
            //   83ff3c               | cmp                 edi, 0x3c
            //   7d6d                 | jge                 0x6f
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   8d5cbbc8             | lea                 ebx, [ebx + edi*4 - 0x38]
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   bb3c000000           | mov                 ebx, 0x3c
            //   2bdf                 | sub                 ebx, edi

        $sequence_8 = { a3???????? e8???????? 8b35???????? a3???????? a1???????? 83c42c 50 }
            // n = 7, score = 100
            //   a3????????           |                     
            //   e8????????           |                     
            //   8b35????????         |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   83c42c               | add                 esp, 0x2c
            //   50                   | push                eax

        $sequence_9 = { 038108020000 25ff000000 898108020000 8a0408 3002 8b9108020000 }
            // n = 6, score = 100
            //   038108020000         | add                 eax, dword ptr [ecx + 0x208]
            //   25ff000000           | and                 eax, 0xff
            //   898108020000         | mov                 dword ptr [ecx + 0x208], eax
            //   8a0408               | mov                 al, byte ptr [eax + ecx]
            //   3002                 | xor                 byte ptr [edx], al
            //   8b9108020000         | mov                 edx, dword ptr [ecx + 0x208]

    condition:
        7 of them and filesize < 163840
}
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