SYMBOLCOMMON_NAMEaka. SYNONYMS
win.linseningsvr (Back to overview)

LinseningSvr


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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_linseningsvr_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_linseningsvr_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.linseningsvr"
        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 = { 80e920 ebe0 80a0808b400000 40 3bc6 72be 5e }
            // n = 7, score = 100
            //   80e920               | sub                 cl, 0x20
            //   ebe0                 | jmp                 0xffffffe2
            //   80a0808b400000       | and                 byte ptr [eax + 0x408b80], 0
            //   40                   | inc                 eax
            //   3bc6                 | cmp                 eax, esi
            //   72be                 | jb                  0xffffffc0
            //   5e                   | pop                 esi

        $sequence_1 = { 8bcb c1f805 83e11f 8b0485c08d4000 }
            // n = 4, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   c1f805               | sar                 eax, 5
            //   83e11f               | and                 ecx, 0x1f
            //   8b0485c08d4000       | mov                 eax, dword ptr [eax*4 + 0x408dc0]

        $sequence_2 = { 83c42c 5f eb26 8d4508 8db6fc874000 }
            // n = 5, score = 100
            //   83c42c               | add                 esp, 0x2c
            //   5f                   | pop                 edi
            //   eb26                 | jmp                 0x28
            //   8d4508               | lea                 eax, [ebp + 8]
            //   8db6fc874000         | lea                 esi, [esi + 0x4087fc]

        $sequence_3 = { 8b55fc 8a92b0884000 0890818c4000 40 3bc7 }
            // n = 5, score = 100
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8a92b0884000         | mov                 dl, byte ptr [edx + 0x4088b0]
            //   0890818c4000         | or                  byte ptr [eax + 0x408c81], dl
            //   40                   | inc                 eax
            //   3bc7                 | cmp                 eax, edi

        $sequence_4 = { 0fb6d2 3bc2 0f8793000000 8088818c400004 40 ebee 6a40 }
            // n = 7, score = 100
            //   0fb6d2               | movzx               edx, dl
            //   3bc2                 | cmp                 eax, edx
            //   0f8793000000         | ja                  0x99
            //   8088818c400004       | or                  byte ptr [eax + 0x408c81], 4
            //   40                   | inc                 eax
            //   ebee                 | jmp                 0xfffffff0
            //   6a40                 | push                0x40

        $sequence_5 = { ffd5 3d10010000 75e7 b904000000 8d7c2418 8db4244c040000 }
            // n = 6, score = 100
            //   ffd5                 | call                ebp
            //   3d10010000           | cmp                 eax, 0x110
            //   75e7                 | jne                 0xffffffe9
            //   b904000000           | mov                 ecx, 4
            //   8d7c2418             | lea                 edi, [esp + 0x18]
            //   8db4244c040000       | lea                 esi, [esp + 0x44c]

        $sequence_6 = { 3bcd 7c3d 8b742418 8bcd 8bc1 }
            // n = 5, score = 100
            //   3bcd                 | cmp                 ecx, ebp
            //   7c3d                 | jl                  0x3f
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]
            //   8bcd                 | mov                 ecx, ebp
            //   8bc1                 | mov                 eax, ecx

        $sequence_7 = { 83e11f 8b0485c08d4000 f644c80401 0f84f9000000 6a01 56 }
            // n = 6, score = 100
            //   83e11f               | and                 ecx, 0x1f
            //   8b0485c08d4000       | mov                 eax, dword ptr [eax*4 + 0x408dc0]
            //   f644c80401           | test                byte ptr [eax + ecx*8 + 4], 1
            //   0f84f9000000         | je                  0xff
            //   6a01                 | push                1
            //   56                   | push                esi

        $sequence_8 = { 8d7c1f18 c1e902 f3a5 8bca }
            // n = 4, score = 100
            //   8d7c1f18             | lea                 edi, [edi + ebx + 0x18]
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx

        $sequence_9 = { 5e 5d b801000000 5b 81c4cc0d0000 }
            // n = 5, score = 100
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   b801000000           | mov                 eax, 1
            //   5b                   | pop                 ebx
            //   81c4cc0d0000         | add                 esp, 0xdcc

    condition:
        7 of them and filesize < 81360
}
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