SYMBOLCOMMON_NAMEaka. SYNONYMS
win.montysthree (Back to overview)

MontysThree

aka: MT3

There is no description at this point.

References
2020-10-08Kaspersky LabsDenis Legezo
@online{legezo:20201008:montysthree:77664e4, author = {Denis Legezo}, title = {{MontysThree: Industrial espionage with steganography and a Russian accent on both sides}}, date = {2020-10-08}, organization = {Kaspersky Labs}, url = {https://securelist.com/montysthree-industrial-espionage/98972/}, language = {English}, urldate = {2020-10-12} } MontysThree: Industrial espionage with steganography and a Russian accent on both sides
MontysThree
Yara Rules
[TLP:WHITE] win_montysthree_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_montysthree_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.montysthree"
        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 = { 68???????? 83c004 50 ff15???????? 8b86600c0000 832000 8d4304 }
            // n = 7, score = 200
            //   68????????           |                     
            //   83c004               | add                 eax, 4
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b86600c0000         | mov                 eax, dword ptr [esi + 0xc60]
            //   832000               | and                 dword ptr [eax], 0
            //   8d4304               | lea                 eax, [ebx + 4]

        $sequence_1 = { e8???????? 3bc7 7520 56 68???????? 8d4d4c }
            // n = 6, score = 200
            //   e8????????           |                     
            //   3bc7                 | cmp                 eax, edi
            //   7520                 | jne                 0x22
            //   56                   | push                esi
            //   68????????           |                     
            //   8d4d4c               | lea                 ecx, [ebp + 0x4c]

        $sequence_2 = { 8d4d08 e8???????? ff30 6a6d ebac 66395f04 7629 }
            // n = 7, score = 200
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e8????????           |                     
            //   ff30                 | push                dword ptr [eax]
            //   6a6d                 | push                0x6d
            //   ebac                 | jmp                 0xffffffae
            //   66395f04             | cmp                 word ptr [edi + 4], bx
            //   7629                 | jbe                 0x2b

        $sequence_3 = { 57 ff7514 33db ff7510 33f6 68???????? e8???????? }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   33db                 | xor                 ebx, ebx
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   33f6                 | xor                 esi, esi
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_4 = { 85c0 7523 6a40 6a40 }
            // n = 4, score = 200
            //   85c0                 | test                eax, eax
            //   7523                 | jne                 0x25
            //   6a40                 | push                0x40
            //   6a40                 | push                0x40

        $sequence_5 = { 50 8d4518 50 e8???????? 3bc6 59 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   8d4518               | lea                 eax, [ebp + 0x18]
            //   50                   | push                eax
            //   e8????????           |                     
            //   3bc6                 | cmp                 eax, esi
            //   59                   | pop                 ecx

        $sequence_6 = { 8d442801 5a f7e2 0f90c1 f7d9 0bc8 51 }
            // n = 7, score = 200
            //   8d442801             | lea                 eax, [eax + ebp + 1]
            //   5a                   | pop                 edx
            //   f7e2                 | mul                 edx
            //   0f90c1               | seto                cl
            //   f7d9                 | neg                 ecx
            //   0bc8                 | or                  ecx, eax
            //   51                   | push                ecx

        $sequence_7 = { c7453c01000000 39770d 7444 8b4f11 3bce 743d }
            // n = 6, score = 200
            //   c7453c01000000       | mov                 dword ptr [ebp + 0x3c], 1
            //   39770d               | cmp                 dword ptr [edi + 0xd], esi
            //   7444                 | je                  0x46
            //   8b4f11               | mov                 ecx, dword ptr [edi + 0x11]
            //   3bce                 | cmp                 ecx, esi
            //   743d                 | je                  0x3f

        $sequence_8 = { 7505 b8???????? 50 ff7708 ffd3 }
            // n = 5, score = 200
            //   7505                 | jne                 7
            //   b8????????           |                     
            //   50                   | push                eax
            //   ff7708               | push                dword ptr [edi + 8]
            //   ffd3                 | call                ebx

        $sequence_9 = { e8???????? 8d45bc 50 8bcf e8???????? 33db 395d20 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   33db                 | xor                 ebx, ebx
            //   395d20               | cmp                 dword ptr [ebp + 0x20], ebx

    condition:
        7 of them and filesize < 458752
}
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