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 (20220516 | Detects win.udpos.)
rule win_udpos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.udpos."
        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.udpos"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 89bde0fbffff 8b3d???????? 51 ffd7 8b95e0fbffff 52 }
            // n = 6, score = 100
            //   89bde0fbffff         | mov                 dword ptr [ebp - 0x420], edi
            //   8b3d????????         |                     
            //   51                   | push                ecx
            //   ffd7                 | call                edi
            //   8b95e0fbffff         | mov                 edx, dword ptr [ebp - 0x420]
            //   52                   | push                edx

        $sequence_1 = { 0fb671fd 8858fd 8bde c1eb04 0fb65c1de8 8858fa }
            // n = 6, score = 100
            //   0fb671fd             | movzx               esi, byte ptr [ecx - 3]
            //   8858fd               | mov                 byte ptr [eax - 3], bl
            //   8bde                 | mov                 ebx, esi
            //   c1eb04               | shr                 ebx, 4
            //   0fb65c1de8           | movzx               ebx, byte ptr [ebp + ebx - 0x18]
            //   8858fa               | mov                 byte ptr [eax - 6], bl

        $sequence_2 = { e8???????? 68???????? be02000000 a3???????? e8???????? 68???????? be22000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   68????????           |                     
            //   be02000000           | mov                 esi, 2
            //   a3????????           |                     
            //   e8????????           |                     
            //   68????????           |                     
            //   be22000000           | mov                 esi, 0x22

        $sequence_3 = { ffd6 8d95ecf6ffff 52 8d85e0f8ffff 50 ffd6 8d8db4f7ffff }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   8d95ecf6ffff         | lea                 edx, [ebp - 0x914]
            //   52                   | push                edx
            //   8d85e0f8ffff         | lea                 eax, [ebp - 0x720]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   8d8db4f7ffff         | lea                 ecx, [ebp - 0x84c]

        $sequence_4 = { 53 8d8df4fdffff 51 ff15???????? 85c0 7503 8d7801 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   8d8df4fdffff         | lea                 ecx, [ebp - 0x20c]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7503                 | jne                 5
            //   8d7801               | lea                 edi, [eax + 1]

        $sequence_5 = { 3bc6 7e15 85c0 7e11 }
            // n = 4, score = 100
            //   3bc6                 | cmp                 eax, esi
            //   7e15                 | jle                 0x17
            //   85c0                 | test                eax, eax
            //   7e11                 | jle                 0x13

        $sequence_6 = { 85c0 7e0e 83f804 7e09 8b15???????? 8b7210 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7e0e                 | jle                 0x10
            //   83f804               | cmp                 eax, 4
            //   7e09                 | jle                 0xb
            //   8b15????????         |                     
            //   8b7210               | mov                 esi, dword ptr [edx + 0x10]

        $sequence_7 = { c1c802 8bf1 8945f4 8955f8 f7d6 }
            // n = 5, score = 100
            //   c1c802               | ror                 eax, 2
            //   8bf1                 | mov                 esi, ecx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   f7d6                 | not                 esi

        $sequence_8 = { 6a00 51 e8???????? 68f4010000 8d95c8fcffff 6a00 52 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     
            //   68f4010000           | push                0x1f4
            //   8d95c8fcffff         | lea                 edx, [ebp - 0x338]
            //   6a00                 | push                0
            //   52                   | push                edx

        $sequence_9 = { 83f801 741a 81fe84030000 7d12 68e8030000 }
            // n = 5, score = 100
            //   83f801               | cmp                 eax, 1
            //   741a                 | je                  0x1c
            //   81fe84030000         | cmp                 esi, 0x384
            //   7d12                 | jge                 0x14
            //   68e8030000           | push                0x3e8

    condition:
        7 of them and filesize < 163840
}
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