SYMBOLCOMMON_NAMEaka. SYNONYMS
win.xxmm (Back to overview)

xxmm

aka: ShadowWalker

Actor(s): Tick


There is no description at this point.

References
2020SecureworksSecureWorks
@online{secureworks:2020:bronze:ef493d6, author = {SecureWorks}, title = {{BRONZE BUTLER}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/bronze-butler}, language = {English}, urldate = {2020-05-23} } BRONZE BUTLER
Daserf xxmm Tick
2019-01-18Dell SecureworksYou Nakatsuru
@techreport{nakatsuru:20190118:understanding:15cc8b9, author = {You Nakatsuru}, title = {{Understanding Command and Control - An Anatomy of xxmm Communication}}, date = {2019-01-18}, institution = {Dell Secureworks}, url = {https://jsac.jpcert.or.jp/archive/2019/pdf/JSAC2019_8_nakatsuru_en.pdf}, language = {English}, urldate = {2019-12-10} } Understanding Command and Control - An Anatomy of xxmm Communication
xxmm
2017-11-07Trend MicroTrendmicro
@online{trendmicro:20171107:redbaldknightbronze:f7c817f, author = {Trendmicro}, title = {{REDBALDKNIGHT/BRONZE BUTLER’s Daserf Backdoor Now Using Steganography}}, date = {2017-11-07}, organization = {Trend Micro}, url = {http://blog.trendmicro.com/trendlabs-security-intelligence/redbaldknight-bronze-butler-daserf-backdoor-now-using-steganography/}, language = {English}, urldate = {2019-11-27} } REDBALDKNIGHT/BRONZE BUTLER’s Daserf Backdoor Now Using Steganography
Daserf Datper xxmm
2017-10-12SecureworksCTU Research Team
@online{team:20171012:bronze:7b9ae02, author = {CTU Research Team}, title = {{BRONZE BUTLER Targets Japanese Enterprises}}, date = {2017-10-12}, organization = {Secureworks}, url = {https://www.secureworks.com/research/bronze-butler-targets-japanese-businesses}, language = {English}, urldate = {2020-01-07} } BRONZE BUTLER Targets Japanese Enterprises
Daserf Datper rarstar xxmm Tick
2017-04-25CybereasonAssaf Dahan
@online{dahan:20170425:shadowwali:565d1c1, author = {Assaf Dahan}, title = {{ShadowWali: New variant of the xxmm family of backdoors}}, date = {2017-04-25}, organization = {Cybereason}, url = {https://www.cybereason.com/blog/labs-shadowwali-new-variant-of-the-xxmm-family-of-backdoors}, language = {English}, urldate = {2020-02-11} } ShadowWali: New variant of the xxmm family of backdoors
xxmm
Yara Rules
[TLP:WHITE] win_xxmm_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_xxmm_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        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.xxmm"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 = { 8b4508 8d440108 894308 c745f401000000 }
            // n = 4, score = 500
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8d440108             | lea                 eax, [ecx + eax + 8]
            //   894308               | mov                 dword ptr [ebx + 8], eax
            //   c745f401000000       | mov                 dword ptr [ebp - 0xc], 1

        $sequence_1 = { 83c314 833b00 7580 8b45f8 2b4634 83bea400000000 }
            // n = 6, score = 500
            //   83c314               | add                 ebx, 0x14
            //   833b00               | cmp                 dword ptr [ebx], 0
            //   7580                 | jne                 0xffffff82
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   2b4634               | sub                 eax, dword ptr [esi + 0x34]
            //   83bea400000000       | cmp                 dword ptr [esi + 0xa4], 0

        $sequence_2 = { eb0f 81fbf232f60e 7507 8b00 03c1 8945e8 }
            // n = 6, score = 500
            //   eb0f                 | jmp                 0x11
            //   81fbf232f60e         | cmp                 ebx, 0xef632f2
            //   7507                 | jne                 9
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   03c1                 | add                 eax, ecx
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax

        $sequence_3 = { 8b0410 03c2 eb12 8b07 0345f8 }
            // n = 5, score = 500
            //   8b0410               | mov                 eax, dword ptr [eax + edx]
            //   03c2                 | add                 eax, edx
            //   eb12                 | jmp                 0x14
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   0345f8               | add                 eax, dword ptr [ebp - 8]

        $sequence_4 = { 6800100000 8d8300240000 50 6a00 ff15???????? }
            // n = 5, score = 500
            //   6800100000           | push                0x1000
            //   8d8300240000         | lea                 eax, [ebx + 0x2400]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_5 = { 8b4c111c 8d0481 8b0410 03c2 }
            // n = 4, score = 500
            //   8b4c111c             | mov                 ecx, dword ptr [ecx + edx + 0x1c]
            //   8d0481               | lea                 eax, [ecx + eax*4]
            //   8b0410               | mov                 eax, dword ptr [eax + edx]
            //   03c2                 | add                 eax, edx

        $sequence_6 = { 8bcb 85c0 740b 2bfb }
            // n = 4, score = 500
            //   8bcb                 | mov                 ecx, ebx
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   2bfb                 | sub                 edi, ebx

        $sequence_7 = { 8b08 53 32db 38591d 752a 8b5108 }
            // n = 6, score = 500
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   53                   | push                ebx
            //   32db                 | xor                 bl, bl
            //   38591d               | cmp                 byte ptr [ecx + 0x1d], bl
            //   752a                 | jne                 0x2c
            //   8b5108               | mov                 edx, dword ptr [ecx + 8]

        $sequence_8 = { 03f3 ff7650 6a00 ff55ec }
            // n = 4, score = 500
            //   03f3                 | add                 esi, ebx
            //   ff7650               | push                dword ptr [esi + 0x50]
            //   6a00                 | push                0
            //   ff55ec               | call                dword ptr [ebp - 0x14]

        $sequence_9 = { 8b0410 03c2 eb12 8b07 }
            // n = 4, score = 500
            //   8b0410               | mov                 eax, dword ptr [eax + edx]
            //   03c2                 | add                 eax, edx
            //   eb12                 | jmp                 0x14
            //   8b07                 | mov                 eax, dword ptr [edi]

    condition:
        7 of them and filesize < 540672
}
[TLP:WHITE] win_xxmm_w0   (20180301 | Detects malware / hacktool sample from Bronze Butler incident)
rule win_xxmm_w0 {
    meta:
        author = "Florian Roth"
        description = "Detects malware / hacktool sample from Bronze Butler incident"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xxmm"
        malpedia_version = "20180301"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $x1 = "\\Release\\ReflectivLoader.pdb" ascii
        $x3 = "\\Projects\\xxmm2\\Release\\" ascii
        $x5 = "http://127.0.0.1/phptunnel.php" fullword ascii

        $s1 = "xxmm2.exe" fullword ascii
        $s2 = "\\AvUpdate.exe" fullword wide
        $s3 = "stdapi_fs_file_download" fullword ascii
        $s4 = "stdapi_syncshell_open" fullword ascii
        $s5 = "stdapi_execute_sleep" fullword ascii
        $s6 = "stdapi_syncshell_kill" fullword ascii
    condition:
        1 of ($x*) or
        4 of them
}
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