SYMBOLCOMMON_NAMEaka. SYNONYMS
win.xpertrat (Back to overview)

XpertRAT


There is no description at this point.

References
2018-12-18K7 SecurityLokesh J
@online{j:20181218:scumbag:720cb3c, author = {Lokesh J}, title = {{Scumbag Combo: Agent Tesla and XpertRAT}}, date = {2018-12-18}, organization = {K7 Security}, url = {https://labs.k7computing.com/?p=15672}, language = {English}, urldate = {2020-01-06} } Scumbag Combo: Agent Tesla and XpertRAT
XpertRAT
2018-03-12Veronica Valeros' BlogVeronica Valeros
@online{valeros:20180312:study:73a8b6b, author = {Veronica Valeros}, title = {{A Study of RATs: Third Timeline Iteration}}, date = {2018-03-12}, organization = {Veronica Valeros' Blog}, url = {https://www.veronicavaleros.com/blog/2018/3/12/a-study-of-rats-third-timeline-iteration}, language = {English}, urldate = {2020-01-10} } A Study of RATs: Third Timeline Iteration
XpertRAT
Yara Rules
[TLP:WHITE] win_xpertrat_auto (20200529 | autogenerated rule brought to you by yara-signator)
rule win_xpertrat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xpertrat"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        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 / approach 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 = { 250004003c 6c 70ff 0808 008a3800cc1c 5e 006c70ff }
            // n = 7, score = 200
            //   250004003c           | and                 eax, 0x3c000400
            //   6c                   | insb                byte ptr es:[edi], dx
            //   70ff                 | jo                  1
            //   0808                 | or                  byte ptr [eax], cl
            //   008a3800cc1c         | add                 byte ptr [edx + 0x1ccc0038], cl
            //   5e                   | pop                 esi
            //   006c70ff             | add                 byte ptr [eax + esi*2 - 1], ch

        $sequence_1 = { ff0468 ff0a 250004003c 6c }
            // n = 4, score = 200
            //   ff0468               | inc                 dword ptr [eax + ebp*2]
            //   ff0a                 | dec                 dword ptr [edx]
            //   250004003c           | and                 eax, 0x3c000400
            //   6c                   | insb                byte ptr es:[edi], dx

        $sequence_2 = { ff4d40 ff08 40 0430 }
            // n = 4, score = 200
            //   ff4d40               | dec                 dword ptr [ebp + 0x40]
            //   ff08                 | dec                 dword ptr [eax]
            //   40                   | inc                 eax
            //   0430                 | add                 al, 0x30

        $sequence_3 = { 00a1cc004400 0bc0 7402 ffe0 68???????? b8???????? }
            // n = 6, score = 200
            //   00a1cc004400         | add                 byte ptr [ecx + 0x4400cc], ah
            //   0bc0                 | or                  eax, eax
            //   7402                 | je                  4
            //   ffe0                 | jmp                 eax
            //   68????????           |                     
            //   b8????????           |                     

        $sequence_4 = { 0878ff 0d98000700 6e 74ff 6e }
            // n = 5, score = 200
            //   0878ff               | or                  byte ptr [eax - 1], bh
            //   0d98000700           | or                  eax, 0x70098
            //   6e                   | outsb               dx, byte ptr [esi]
            //   74ff                 | je                  1
            //   6e                   | outsb               dx, byte ptr [esi]

        $sequence_5 = { ff0478 ff05???????? 000d???????? 0878ff 0d98000700 }
            // n = 5, score = 200
            //   ff0478               | inc                 dword ptr [eax + edi*2]
            //   ff05????????         |                     
            //   000d????????         |                     
            //   0878ff               | or                  byte ptr [eax - 1], bh
            //   0d98000700           | or                  eax, 0x70098

        $sequence_6 = { 40 0430 ff0a 4c 000c00 }
            // n = 5, score = 200
            //   40                   | inc                 eax
            //   0430                 | add                 al, 0x30
            //   ff0a                 | dec                 dword ptr [edx]
            //   4c                   | dec                 esp
            //   000c00               | add                 byte ptr [eax + eax], cl

        $sequence_7 = { 0808 008f38001b26 001b 0d002a2364 }
            // n = 4, score = 200
            //   0808                 | or                  byte ptr [eax], cl
            //   008f38001b26         | add                 byte ptr [edi + 0x261b0038], cl
            //   001b                 | add                 byte ptr [ebx], bl
            //   0d002a2364           | or                  eax, 0x64232a00

        $sequence_8 = { 0f8059040000 52 6a01 6a03 53 6a04 6880000000 }
            // n = 7, score = 100
            //   0f8059040000         | jo                  0x45f
            //   52                   | push                edx
            //   6a01                 | push                1
            //   6a03                 | push                3
            //   53                   | push                ebx
            //   6a04                 | push                4
            //   6880000000           | push                0x80

        $sequence_9 = { c7458c2ce64200 8bc4 c7458408800000 6a01 57 }
            // n = 5, score = 100
            //   c7458c2ce64200       | mov                 dword ptr [ebp - 0x74], 0x42e62c
            //   8bc4                 | mov                 eax, esp
            //   c7458408800000       | mov                 dword ptr [ebp - 0x7c], 0x8008
            //   6a01                 | push                1
            //   57                   | push                edi

        $sequence_10 = { b828000000 895104 894108 8b8560ffffff }
            // n = 4, score = 100
            //   b828000000           | mov                 eax, 0x28
            //   895104               | mov                 dword ptr [ecx + 4], edx
            //   894108               | mov                 dword ptr [ecx + 8], eax
            //   8b8560ffffff         | mov                 eax, dword ptr [ebp - 0xa0]

        $sequence_11 = { c7459001000000 ffd7 8b1d???????? 8bd0 }
            // n = 4, score = 100
            //   c7459001000000       | mov                 dword ptr [ebp - 0x70], 1
            //   ffd7                 | call                edi
            //   8b1d????????         |                     
            //   8bd0                 | mov                 edx, eax

        $sequence_12 = { 8d4d84 51 ff15???????? 83c41c }
            // n = 4, score = 100
            //   8d4d84               | lea                 ecx, [ebp - 0x7c]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   83c41c               | add                 esp, 0x1c

        $sequence_13 = { 8901 8b45cc 894104 b802000000 895108 }
            // n = 5, score = 100
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8b45cc               | mov                 eax, dword ptr [ebp - 0x34]
            //   894104               | mov                 dword ptr [ecx + 4], eax
            //   b802000000           | mov                 eax, 2
            //   895108               | mov                 dword ptr [ecx + 8], edx

        $sequence_14 = { 56 bf01000000 bb03000000 ff90ec080000 83ec10 b903000000 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   bf01000000           | mov                 edi, 1
            //   bb03000000           | mov                 ebx, 3
            //   ff90ec080000         | call                dword ptr [eax + 0x8ec]
            //   83ec10               | sub                 esp, 0x10
            //   b903000000           | mov                 ecx, 3

        $sequence_15 = { 8b5174 52 6a01 ff15???????? 83e801 0f8038140000 }
            // n = 6, score = 100
            //   8b5174               | mov                 edx, dword ptr [ecx + 0x74]
            //   52                   | push                edx
            //   6a01                 | push                1
            //   ff15????????         |                     
            //   83e801               | sub                 eax, 1
            //   0f8038140000         | jo                  0x143e

    condition:
        7 of them and filesize < 8560640
}
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