SYMBOLCOMMON_NAMEaka. SYNONYMS
win.beepservice (Back to overview)

BeepService


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References
2014-02-14SecureworksCounter Threat Unit ResearchTeam
@online{researchteam:20140214:analysis:0417082, author = {Counter Threat Unit ResearchTeam}, title = {{Analysis of DHS NCCIC Indicators}}, date = {2014-02-14}, organization = {Secureworks}, url = {https://www.secureworks.com/research/analysis-of-dhs-nccic-indicators}, language = {English}, urldate = {2020-05-26} } Analysis of DHS NCCIC Indicators
jspRAT BeepService DDKeylogger LinseningSvr ONHAT SimpleFileMover ZiyangRAT
Yara Rules
[TLP:WHITE] win_beepservice_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_beepservice_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.beepservice"
        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 = { 8b0d???????? 68???????? ffd6 8bc8 ff15???????? 50 }
            // n = 6, score = 600
            //   8b0d????????         |                     
            //   68????????           |                     
            //   ffd6                 | call                esi
            //   8bc8                 | mov                 ecx, eax
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_1 = { 83f801 7505 e8???????? 68???????? 68???????? }
            // n = 5, score = 500
            //   83f801               | cmp                 eax, 1
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   68????????           |                     
            //   68????????           |                     

        $sequence_2 = { 7512 6888130000 68???????? e8???????? }
            // n = 4, score = 500
            //   7512                 | jne                 0x14
            //   6888130000           | push                0x1388
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_3 = { 683f000f00 6a00 68???????? ff15???????? }
            // n = 4, score = 500
            //   683f000f00           | push                0xf003f
            //   6a00                 | push                0
            //   68????????           |                     
            //   ff15????????         |                     

        $sequence_4 = { ff15???????? 50 68???????? e8???????? 83c408 eb0d 68???????? }
            // n = 7, score = 500
            //   ff15????????         |                     
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   eb0d                 | jmp                 0xf
            //   68????????           |                     

        $sequence_5 = { 83c408 e9???????? 68???????? e8???????? 83c404 6a00 6a00 }
            // n = 7, score = 500
            //   83c408               | add                 esp, 8
            //   e9????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_6 = { 68???????? 8d85fcfdffff 68???????? 50 ff15???????? 83c410 }
            // n = 6, score = 400
            //   68????????           |                     
            //   8d85fcfdffff         | lea                 eax, [ebp - 0x204]
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c410               | add                 esp, 0x10

        $sequence_7 = { 57 ff760c ff15???????? 33ff 6a14 57 68???????? }
            // n = 7, score = 400
            //   57                   | push                edi
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   ff15????????         |                     
            //   33ff                 | xor                 edi, edi
            //   6a14                 | push                0x14
            //   57                   | push                edi
            //   68????????           |                     

        $sequence_8 = { 8d85fcfdffff 56 56 6a02 }
            // n = 4, score = 400
            //   8d85fcfdffff         | lea                 eax, [ebp - 0x204]
            //   56                   | push                esi
            //   56                   | push                esi
            //   6a02                 | push                2

        $sequence_9 = { e8???????? ff7608 e8???????? 83c40c 83f814 }
            // n = 5, score = 400
            //   e8????????           |                     
            //   ff7608               | push                dword ptr [esi + 8]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   83f814               | cmp                 eax, 0x14

        $sequence_10 = { ff15???????? 50 ff15???????? 59 33c0 eb03 6a01 }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   eb03                 | jmp                 5
            //   6a01                 | push                1

        $sequence_11 = { 68???????? e8???????? 59 59 ff761c e8???????? }
            // n = 6, score = 400
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   ff761c               | push                dword ptr [esi + 0x1c]
            //   e8????????           |                     

        $sequence_12 = { 89442420 e8???????? 6a02 bd???????? 57 }
            // n = 5, score = 400
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   e8????????           |                     
            //   6a02                 | push                2
            //   bd????????           |                     
            //   57                   | push                edi

        $sequence_13 = { b90a000000 a3???????? bf???????? a3???????? 83c404 a3???????? a3???????? }
            // n = 7, score = 300
            //   b90a000000           | mov                 ecx, 0xa
            //   a3????????           |                     
            //   bf????????           |                     
            //   a3????????           |                     
            //   83c404               | add                 esp, 4
            //   a3????????           |                     
            //   a3????????           |                     

        $sequence_14 = { 8bc8 83e103 f3a4 e8???????? 83f801 7505 }
            // n = 6, score = 300
            //   8bc8                 | mov                 ecx, eax
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   e8????????           |                     
            //   83f801               | cmp                 eax, 1
            //   7505                 | jne                 7

        $sequence_15 = { 668915???????? 8b7310 8bfe 83c9ff f2ae f7d1 }
            // n = 6, score = 300
            //   668915????????       |                     
            //   8b7310               | mov                 esi, dword ptr [ebx + 0x10]
            //   8bfe                 | mov                 edi, esi
            //   83c9ff               | or                  ecx, 0xffffffff
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx

        $sequence_16 = { 6a20 6a00 68???????? e8???????? 83c40c 8b550c }
            // n = 6, score = 200
            //   6a20                 | push                0x20
            //   6a00                 | push                0
            //   68????????           |                     
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]

        $sequence_17 = { 50 8b4d08 51 8b0d???????? ff15???????? 8bc8 ff15???????? }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   8b0d????????         |                     
            //   ff15????????         |                     
            //   8bc8                 | mov                 ecx, eax
            //   ff15????????         |                     

        $sequence_18 = { 83c404 83bdf4fdffff00 740d 8b95f4fdffff }
            // n = 4, score = 200
            //   83c404               | add                 esp, 4
            //   83bdf4fdffff00       | cmp                 dword ptr [ebp - 0x20c], 0
            //   740d                 | je                  0xf
            //   8b95f4fdffff         | mov                 edx, dword ptr [ebp - 0x20c]

        $sequence_19 = { f7d1 49 3bd1 72dc 84db }
            // n = 5, score = 100
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   3bd1                 | cmp                 edx, ecx
            //   72dc                 | jb                  0xffffffde
            //   84db                 | test                bl, bl

        $sequence_20 = { 7403 50 ffd6 a1???????? 85c0 7415 8b442408 }
            // n = 7, score = 100
            //   7403                 | je                  5
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   7415                 | je                  0x17
            //   8b442408             | mov                 eax, dword ptr [esp + 8]

        $sequence_21 = { 1bc0 83e007 89442408 8b442428 85c0 750a 8b4c2424 }
            // n = 7, score = 100
            //   1bc0                 | sbb                 eax, eax
            //   83e007               | and                 eax, 7
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   8b4c2424             | mov                 ecx, dword ptr [esp + 0x24]

        $sequence_22 = { f2ae f7d1 49 7428 8a8228304000 }
            // n = 5, score = 100
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   7428                 | je                  0x2a
            //   8a8228304000         | mov                 al, byte ptr [edx + 0x403028]

        $sequence_23 = { 40 3bc1 7ced b90a000000 }
            // n = 4, score = 100
            //   40                   | inc                 eax
            //   3bc1                 | cmp                 eax, ecx
            //   7ced                 | jl                  0xffffffef
            //   b90a000000           | mov                 ecx, 0xa

        $sequence_24 = { 83c404 52 68???????? 50 e8???????? 8d44240c }
            // n = 6, score = 100
            //   83c404               | add                 esp, 4
            //   52                   | push                edx
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d44240c             | lea                 eax, [esp + 0xc]

        $sequence_25 = { a1???????? 85c0 746b a1???????? 85c0 7562 }
            // n = 6, score = 100
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   746b                 | je                  0x6d
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   7562                 | jne                 0x64

        $sequence_26 = { 740d 68???????? ff15???????? eb0a 68???????? }
            // n = 5, score = 100
            //   740d                 | je                  0xf
            //   68????????           |                     
            //   ff15????????         |                     
            //   eb0a                 | jmp                 0xc
            //   68????????           |                     

    condition:
        7 of them and filesize < 253952
}
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