SYMBOLCOMMON_NAMEaka. SYNONYMS
win.nemim (Back to overview)

Nemim

aka: Nemain

Actor(s): DarkHotel


There is no description at this point.

References
2020-09-08NSFOCUSNSFOCUS
@online{nsfocus:20200908:groupdarkhotelrat:f6ecf8c, author = {NSFOCUS}, title = {{APT GROUP系列——DARKHOTEL之窃密与RAT篇}}, date = {2020-09-08}, organization = {NSFOCUS}, url = {http://blog.nsfocus.net/darkhotel-3-0908/}, language = {Chinese}, urldate = {2020-09-15} } APT GROUP系列——DARKHOTEL之窃密与RAT篇
Nemim
2020SecureworksSecureWorks
@online{secureworks:2020:tungsten:f923f8b, author = {SecureWorks}, title = {{TUNGSTEN BRIDGE}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/tungsten-bridge}, language = {English}, urldate = {2020-05-23} } TUNGSTEN BRIDGE
Nemim DarkHotel
Yara Rules
[TLP:WHITE] win_nemim_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_nemim_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.nemim"
        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 = { 83f830 0f87c6020000 ff248571de4100 ff750c e8???????? 50 }
            // n = 6, score = 200
            //   83f830               | cmp                 eax, 0x30
            //   0f87c6020000         | ja                  0x2cc
            //   ff248571de4100       | jmp                 dword ptr [eax*4 + 0x41de71]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_1 = { e8???????? 8bc6 83e61f c1f805 59 8b048540604300 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   83e61f               | and                 esi, 0x1f
            //   c1f805               | sar                 eax, 5
            //   59                   | pop                 ecx
            //   8b048540604300       | mov                 eax, dword ptr [eax*4 + 0x436040]

        $sequence_2 = { ff2485cd094200 6a03 eb47 6a08 eb43 83f86b }
            // n = 6, score = 200
            //   ff2485cd094200       | jmp                 dword ptr [eax*4 + 0x4209cd]
            //   6a03                 | push                3
            //   eb47                 | jmp                 0x49
            //   6a08                 | push                8
            //   eb43                 | jmp                 0x45
            //   83f86b               | cmp                 eax, 0x6b

        $sequence_3 = { 59 83c8ff c3 33c0 c3 83ec10 }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   83c8ff               | or                  eax, 0xffffffff
            //   c3                   | ret                 
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 
            //   83ec10               | sub                 esp, 0x10

        $sequence_4 = { 6802000080 ff15???????? 8b1d???????? a3???????? }
            // n = 4, score = 200
            //   6802000080           | push                0x80000002
            //   ff15????????         |                     
            //   8b1d????????         |                     
            //   a3????????           |                     

        $sequence_5 = { 8dbc3afa27a1ea 8bd7 c1e70b c1ea15 0bd7 03d0 }
            // n = 6, score = 200
            //   8dbc3afa27a1ea       | lea                 edi, [edx + edi - 0x155ed806]
            //   8bd7                 | mov                 edx, edi
            //   c1e70b               | shl                 edi, 0xb
            //   c1ea15               | shr                 edx, 0x15
            //   0bd7                 | or                  edx, edi
            //   03d0                 | add                 edx, eax

        $sequence_6 = { 8bf0 e8???????? 68???????? e8???????? 8bd8 68???????? }
            // n = 6, score = 200
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   68????????           |                     

        $sequence_7 = { 8944247c b90c000000 33c0 8dbc2481000000 89542478 8d94244c010000 f3ab }
            // n = 7, score = 200
            //   8944247c             | mov                 dword ptr [esp + 0x7c], eax
            //   b90c000000           | mov                 ecx, 0xc
            //   33c0                 | xor                 eax, eax
            //   8dbc2481000000       | lea                 edi, [esp + 0x81]
            //   89542478             | mov                 dword ptr [esp + 0x78], edx
            //   8d94244c010000       | lea                 edx, [esp + 0x14c]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_8 = { 57 8b7c2410 b856555555 8d0cbd00000000 f7e9 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   8b7c2410             | mov                 edi, dword ptr [esp + 0x10]
            //   b856555555           | mov                 eax, 0x55555556
            //   8d0cbd00000000       | lea                 ecx, [edi*4]
            //   f7e9                 | imul                ecx

        $sequence_9 = { 8b0d???????? 33c0 8bd1 8dbc2450020000 c1e902 f3ab 8bca }
            // n = 7, score = 200
            //   8b0d????????         |                     
            //   33c0                 | xor                 eax, eax
            //   8bd1                 | mov                 edx, ecx
            //   8dbc2450020000       | lea                 edi, [esp + 0x250]
            //   c1e902               | shr                 ecx, 2
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8bca                 | mov                 ecx, edx

    condition:
        7 of them and filesize < 499712
}
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