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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_lowkey_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.lowkey"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { eb22 488d1d492f0300 eb19 488d1d382f0300 eb10 488d1d3f2f0300 eb07 }
            // n = 7, score = 100
            //   eb22                 | lea                 eax, [edx + 1]
            //   488d1d492f0300       | jmp                 0xf0
            //   eb19                 | cmp                 edi, 1
            //   488d1d382f0300       | jle                 0xf0
            //   eb10                 | dec                 eax
            //   488d1d3f2f0300       | mov                 edx, dword ptr [esi + 8]
            //   eb07                 | dec                 eax

        $sequence_1 = { 488b4808 e8???????? eb4e b9d6000000 663bc1 755a 4c3935???????? }
            // n = 7, score = 100
            //   488b4808             | dec                 eax
            //   e8????????           |                     
            //   eb4e                 | mov                 dword ptr [esp + 0x28], ebx
            //   b9d6000000           | mov                 dword ptr [esp + 0x20], ebx
            //   663bc1               | inc                 ecx
            //   755a                 | mov                 eax, dword ptr [esi + 0x104]
            //   4c3935????????       |                     

        $sequence_2 = { 4883ec28 488d0dcd660300 e8???????? 488d0dd9660300 e8???????? b001 }
            // n = 6, score = 100
            //   4883ec28             | cmp                 eax, dword ptr [esi + 0x20]
            //   488d0dcd660300       | sete                al
            //   e8????????           |                     
            //   488d0dd9660300       | mov                 byte ptr [esi + 8], al
            //   e8????????           |                     
            //   b001                 | add                 dword ptr [esi + 0x1c], ebp

        $sequence_3 = { 4885c0 418bce 0f95c1 85c9 0f84b7000000 4885db 7418 }
            // n = 7, score = 100
            //   4885c0               | arpl                ax, ax
            //   418bce               | mov                 dword ptr [esi + 0x20], eax
            //   0f95c1               | mov                 ecx, dword ptr [esi + 0x20]
            //   85c9                 | cmp                 dword ptr [esi + 0x1c], ecx
            //   0f84b7000000         | sete                al
            //   4885db               | cmovg               eax, ebp
            //   7418                 | dec                 esp

        $sequence_4 = { 4c8d8570090000 6689442435 488d542430 e8???????? }
            // n = 4, score = 100
            //   4c8d8570090000       | sub                 edi, eax
            //   6689442435           | inc                 esp
            //   488d542430           | cmp                 edi, ebp
            //   e8????????           |                     

        $sequence_5 = { 488d9570030000 b9f4010000 ff15???????? 4c8d8d70070000 4c8d8570030000 }
            // n = 5, score = 100
            //   488d9570030000       | dec                 eax
            //   b9f4010000           | lea                 ecx, [ebp + 0x4c0]
            //   ff15????????         |                     
            //   4c8d8d70070000       | dec                 eax
            //   4c8d8570030000       | mov                 dword ptr [esp + 0x20], eax

        $sequence_6 = { 488bc1 48c1f806 4c8d0518f10200 83e23f 48c1e206 498b04c0 }
            // n = 6, score = 100
            //   488bc1               | mov                 esi, dword ptr [ebx + 0x18]
            //   48c1f806             | dec                 ecx
            //   4c8d0518f10200       | mov                 edi, dword ptr [ebx + 0x20]
            //   83e23f               | dec                 eax
            //   48c1e206             | xor                 ecx, esp
            //   498b04c0             | dec                 esp

        $sequence_7 = { 4963e8 4885db 7409 488bcb ff15???????? 48897c2430 4c897c2420 }
            // n = 7, score = 100
            //   4963e8               | dec                 esp
            //   4885db               | lea                 eax, [0xbaec]
            //   7409                 | dec                 eax
            //   488bcb               | lea                 edx, [0x9bed]
            //   ff15????????         |                     
            //   48897c2430           | dec                 eax
            //   4c897c2420           | sub                 esp, 0x20

        $sequence_8 = { ff15???????? eb62 ff15???????? 448bf8 8bf7 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   eb62                 | mov                 ecx, dword ptr [ebx + edi]
            //   ff15????????         |                     
            //   448bf8               | push                edi
            //   8bf7                 | dec                 eax

        $sequence_9 = { 488bce ff15???????? ebb9 b866000000 897c2450 4c8d4570 668944244d }
            // n = 7, score = 100
            //   488bce               | cmp                 ebp, dword ptr [esp + 0x50]
            //   ff15????????         |                     
            //   ebb9                 | jge                 0xca9
            //   b866000000           | dec                 ecx
            //   897c2450             | arpl                sp, ax
            //   4c8d4570             | inc                 esp
            //   668944244d           | mov                 esp, dword ptr [esp + 0x50]

    condition:
        7 of them and filesize < 643072
}
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