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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_nemim_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.nemim"
        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 = { 8d44240c 55 50 56 }
            // n = 4, score = 100
            //   8d44240c             | lea                 eax, [esp + 0xc]
            //   55                   | push                ebp
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_1 = { 8d047f 8b0cc5407e4300 51 56 }
            // n = 4, score = 100
            //   8d047f               | lea                 eax, [edi + edi*2]
            //   8b0cc5407e4300       | mov                 ecx, dword ptr [eax*8 + 0x437e40]
            //   51                   | push                ecx
            //   56                   | push                esi

        $sequence_2 = { 56 e8???????? 85c0 c744241028010000 75dd }
            // n = 5, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   c744241028010000     | mov                 dword ptr [esp + 0x10], 0x128
            //   75dd                 | jne                 0xffffffdf

        $sequence_3 = { 6689542408 0f85c5000000 56 8d742428 33c0 33c9 8a8699010000 }
            // n = 7, score = 100
            //   6689542408           | mov                 word ptr [esp + 8], dx
            //   0f85c5000000         | jne                 0xcb
            //   56                   | push                esi
            //   8d742428             | lea                 esi, [esp + 0x28]
            //   33c0                 | xor                 eax, eax
            //   33c9                 | xor                 ecx, ecx
            //   8a8699010000         | mov                 al, byte ptr [esi + 0x199]

        $sequence_4 = { 4f 894efc 75d9 8b5c2454 8b6c2414 8b7b0c }
            // n = 6, score = 100
            //   4f                   | dec                 edi
            //   894efc               | mov                 dword ptr [esi - 4], ecx
            //   75d9                 | jne                 0xffffffdb
            //   8b5c2454             | mov                 ebx, dword ptr [esp + 0x54]
            //   8b6c2414             | mov                 ebp, dword ptr [esp + 0x14]
            //   8b7b0c               | mov                 edi, dword ptr [ebx + 0xc]

        $sequence_5 = { e8???????? 83c408 85c0 7412 68???????? 68???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7412                 | je                  0x14
            //   68????????           |                     
            //   68????????           |                     

        $sequence_6 = { 8d442430 68???????? 50 e8???????? 83c420 33c0 8a8c0694010000 }
            // n = 7, score = 100
            //   8d442430             | lea                 eax, [esp + 0x30]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c420               | add                 esp, 0x20
            //   33c0                 | xor                 eax, eax
            //   8a8c0694010000       | mov                 cl, byte ptr [esi + eax + 0x194]

        $sequence_7 = { 6800010000 68???????? ff15???????? 8d04b6 8d0480 8d0c80 }
            // n = 6, score = 100
            //   6800010000           | push                0x100
            //   68????????           |                     
            //   ff15????????         |                     
            //   8d04b6               | lea                 eax, [esi + esi*4]
            //   8d0480               | lea                 eax, [eax + eax*4]
            //   8d0c80               | lea                 ecx, [eax + eax*4]

        $sequence_8 = { 57 b926000000 be???????? 8d7c2420 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   b926000000           | mov                 ecx, 0x26
            //   be????????           |                     
            //   8d7c2420             | lea                 edi, [esp + 0x20]

        $sequence_9 = { 8d04ad00000000 399c8044744300 8d3480 7553 8b864c744300 48 }
            // n = 6, score = 100
            //   8d04ad00000000       | lea                 eax, [ebp*4]
            //   399c8044744300       | cmp                 dword ptr [eax + eax*4 + 0x437444], ebx
            //   8d3480               | lea                 esi, [eax + eax*4]
            //   7553                 | jne                 0x55
            //   8b864c744300         | mov                 eax, dword ptr [esi + 0x43744c]
            //   48                   | dec                 eax

    condition:
        7 of them and filesize < 499712
}
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