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 (20230125 | Detects win.linseningsvr.)
rule win_linseningsvr_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.linseningsvr."
        info = "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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 7355 8bc1 8bf1 c1f805 83e61f 8d3c85c08d4000 }
            // n = 6, score = 100
            //   7355                 | jae                 0x57
            //   8bc1                 | mov                 eax, ecx
            //   8bf1                 | mov                 esi, ecx
            //   c1f805               | sar                 eax, 5
            //   83e61f               | and                 esi, 0x1f
            //   8d3c85c08d4000       | lea                 edi, [eax*4 + 0x408dc0]

        $sequence_1 = { f682818c400004 7403 40 ff01 ff01 }
            // n = 5, score = 100
            //   f682818c400004       | test                byte ptr [edx + 0x408c81], 4
            //   7403                 | je                  5
            //   40                   | inc                 eax
            //   ff01                 | inc                 dword ptr [ecx]
            //   ff01                 | inc                 dword ptr [ecx]

        $sequence_2 = { 8b4c2418 85c9 7e16 8b742414 }
            // n = 4, score = 100
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]
            //   85c9                 | test                ecx, ecx
            //   7e16                 | jle                 0x18
            //   8b742414             | mov                 esi, dword ptr [esp + 0x14]

        $sequence_3 = { 8d1c85c08d4000 8b0485c08d4000 03c6 8a5004 }
            // n = 4, score = 100
            //   8d1c85c08d4000       | lea                 ebx, [eax*4 + 0x408dc0]
            //   8b0485c08d4000       | mov                 eax, dword ptr [eax*4 + 0x408dc0]
            //   03c6                 | add                 eax, esi
            //   8a5004               | mov                 dl, byte ptr [eax + 4]

        $sequence_4 = { 52 53 ffd5 3d10010000 75e7 b904000000 }
            // n = 6, score = 100
            //   52                   | push                edx
            //   53                   | push                ebx
            //   ffd5                 | call                ebp
            //   3d10010000           | cmp                 eax, 0x110
            //   75e7                 | jne                 0xffffffe9
            //   b904000000           | mov                 ecx, 4

        $sequence_5 = { 68???????? 50 e8???????? ffb6fc874000 8d8560ffffff }
            // n = 5, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   ffb6fc874000         | push                dword ptr [esi + 0x4087fc]
            //   8d8560ffffff         | lea                 eax, [ebp - 0xa0]

        $sequence_6 = { 8bf8 83c408 85ff 750a 6a64 ff15???????? ebdd }
            // n = 7, score = 100
            //   8bf8                 | mov                 edi, eax
            //   83c408               | add                 esp, 8
            //   85ff                 | test                edi, edi
            //   750a                 | jne                 0xc
            //   6a64                 | push                0x64
            //   ff15????????         |                     
            //   ebdd                 | jmp                 0xffffffdf

        $sequence_7 = { 8bcb 0c01 c1f905 83e61f 88450b 8d3c8dc08d4000 c1e603 }
            // n = 7, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   0c01                 | or                  al, 1
            //   c1f905               | sar                 ecx, 5
            //   83e61f               | and                 esi, 0x1f
            //   88450b               | mov                 byte ptr [ebp + 0xb], al
            //   8d3c8dc08d4000       | lea                 edi, [ecx*4 + 0x408dc0]
            //   c1e603               | shl                 esi, 3

        $sequence_8 = { 7718 c705????????0d000000 c3 8b04d5cc834000 a3???????? }
            // n = 5, score = 100
            //   7718                 | ja                  0x1a
            //   c705????????0d000000     |     
            //   c3                   | ret                 
            //   8b04d5cc834000       | mov                 eax, dword ptr [edx*8 + 0x4083cc]
            //   a3????????           |                     

        $sequence_9 = { 83c408 55 6800010000 8d942464040000 6a01 }
            // n = 5, score = 100
            //   83c408               | add                 esp, 8
            //   55                   | push                ebp
            //   6800010000           | push                0x100
            //   8d942464040000       | lea                 edx, [esp + 0x464]
            //   6a01                 | push                1

    condition:
        7 of them and filesize < 81360
}
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