SYMBOLCOMMON_NAMEaka. SYNONYMS
win.lowkey (Back to overview)

LOWKEY

aka: PortReuse

Actor(s): APT41


There is no description at this point.

References
2019-10-21ESET ResearchMathieu Tartare
@online{tartare:20191021:winnti:eb2c722, author = {Mathieu Tartare}, title = {{Winnti Group’s skip‑2.0: A Microsoft SQL Server backdoor}}, date = {2019-10-21}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2019/10/21/winnti-group-skip2-0-microsoft-sql-server-backdoor/}, language = {English}, urldate = {2019-11-14} } Winnti Group’s skip‑2.0: A Microsoft SQL Server backdoor
LOWKEY skip-2.0
2019-10-15FireEyeTobias Krueger
@online{krueger:20191015:lowkey:aab2f5e, author = {Tobias Krueger}, title = {{LOWKEY: Hunting for the Missing Volume Serial ID}}, date = {2019-10-15}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2019/10/lowkey-hunting-for-the-missing-volume-serial-id.html}, language = {English}, urldate = {2019-12-10} } LOWKEY: Hunting for the Missing Volume Serial ID
LOWKEY poisonplug
2019-10-07ESET ResearchMarc-Etienne M.Léveillé, Mathieu Tartare
@techreport{mlveill:20191007:connecting:e59d4c8, author = {Marc-Etienne M.Léveillé and Mathieu Tartare}, title = {{CONNECTING THE DOTS: Exposing the arsenal and methods of the Winnti Group}}, date = {2019-10-07}, institution = {ESET Research}, url = {https://www.welivesecurity.com/wp-content/uploads/2019/10/ESET_Winnti.pdf}, language = {English}, urldate = {2020-01-10} } CONNECTING THE DOTS: Exposing the arsenal and methods of the Winnti Group
LOWKEY shadowhammer ShadowPad
Yara Rules
[TLP:WHITE] win_lowkey_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_lowkey_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.lowkey"
        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 = { 0f1f4000 660f1f840000000000 0fb601 88040a 488d4901 84c0 }
            // n = 6, score = 100
            //   0f1f4000             | dec                 eax
            //   660f1f840000000000     | sar    eax, 6
            //   0fb601               | dec                 eax
            //   88040a               | shl                 ecx, 6
            //   488d4901             | dec                 eax
            //   84c0                 | lea                 edx, [0x9b2a]

        $sequence_1 = { 498bc0 488b5c2430 4883c420 5f c3 488b4110 }
            // n = 6, score = 100
            //   498bc0               | inc                 ecx
            //   488b5c2430           | cmp                 al, 0xd
            //   4883c420             | je                  0x52
            //   5f                   | inc                 ecx
            //   c3                   | cmp                 al, 0x20
            //   488b4110             | je                  0x52

        $sequence_2 = { 807c246c2e 0f84f2000000 4c8d4c246c 4c8bc3 488d15a3280200 488d8da0020000 e8???????? }
            // n = 7, score = 100
            //   807c246c2e           | mov                 dword ptr [ebx], ecx
            //   0f84f2000000         | dec                 eax
            //   4c8d4c246c           | lea                 edx, [ebx + 8]
            //   4c8bc3               | xor                 ecx, ecx
            //   488d15a3280200       | dec                 eax
            //   488d8da0020000       | sub                 esp, 0x20
            //   e8????????           |                     

        $sequence_3 = { 4c89ac24a8470000 458d6e66 660f1f440000 41b910000000 4c8d442438 e8???????? 85c0 }
            // n = 7, score = 100
            //   4c89ac24a8470000     | sub                 esp, 0x20
            //   458d6e66             | jmp                 0xebe
            //   660f1f440000         | dec                 eax
            //   41b910000000         | lea                 eax, [0x3f197]
            //   4c8d442438           | dec                 ebx
            //   e8????????           |                     
            //   85c0                 | dec                 eax

        $sequence_4 = { 33db 8bfa 488bf1 85d2 7e38 660f1f440000 }
            // n = 6, score = 100
            //   33db                 | dec                 eax
            //   8bfa                 | lea                 ecx, [ebp + 0x30]
            //   488bf1               | dec                 esp
            //   85d2                 | mov                 eax, dword ptr [ebp - 0x70]
            //   7e38                 | dec                 eax
            //   660f1f440000         | mov                 dword ptr [esp + 0x28], eax

        $sequence_5 = { 8bda 488b4910 e8???????? 488d4f50 ff15???????? 488d4f28 ff15???????? }
            // n = 7, score = 100
            //   8bda                 | jne                 0x849
            //   488b4910             | dec                 eax
            //   e8????????           |                     
            //   488d4f50             | xor                 eax, esp
            //   ff15????????         |                     
            //   488d4f28             | dec                 eax
            //   ff15????????         |                     

        $sequence_6 = { 4a8794f1209b0400 eb2d 4c8b05???????? ebb1 b940000000 }
            // n = 5, score = 100
            //   4a8794f1209b0400     | mov                 dword ptr [esp + 8], ebx
            //   eb2d                 | dec                 eax
            //   4c8b05????????       |                     
            //   ebb1                 | mov                 dword ptr [esp + 0x10], edi
            //   b940000000           | dec                 eax

        $sequence_7 = { 488d15669b0000 e8???????? 488bf8 4885c0 740f }
            // n = 5, score = 100
            //   488d15669b0000       | dec                 eax
            //   e8????????           |                     
            //   488bf8               | mov                 ecx, ebx
            //   4885c0               | test                eax, eax
            //   740f                 | inc                 ecx

        $sequence_8 = { 4c89ac24c0210000 ff15???????? 488b4b10 e8???????? 448be8 4183fe04 }
            // n = 6, score = 100
            //   4c89ac24c0210000     | mov                 eax, 0x100
            //   ff15????????         |                     
            //   488b4b10             | dec                 eax
            //   e8????????           |                     
            //   448be8               | test                ebx, ebx
            //   4183fe04             | jne                 0x28f

        $sequence_9 = { 480f45442478 488d4d30 4c8b4590 4889442428 8b45c0 }
            // n = 5, score = 100
            //   480f45442478         | je                  0x15d4
            //   488d4d30             | jmp                 0x1418
            //   4c8b4590             | test                eax, eax
            //   4889442428           | je                  0x15fd
            //   8b45c0               | movzx               eax, word ptr [esp + 0x65]

    condition:
        7 of them and filesize < 643072
}
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