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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_montysthree_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.montysthree"
        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 = { 8b75fc 59 59 5f 56 e8???????? 837df4ff }
            // n = 7, score = 100
            //   8b75fc               | mov                 esi, dword ptr [ebp - 4]
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   837df4ff             | cmp                 dword ptr [ebp - 0xc], -1

        $sequence_1 = { 8d85ecfeffff 50 c785ecfeffff14010000 ff15???????? 8b85f0feffff 6a06 59 }
            // n = 7, score = 100
            //   8d85ecfeffff         | lea                 eax, [ebp - 0x114]
            //   50                   | push                eax
            //   c785ecfeffff14010000     | mov    dword ptr [ebp - 0x114], 0x114
            //   ff15????????         |                     
            //   8b85f0feffff         | mov                 eax, dword ptr [ebp - 0x110]
            //   6a06                 | push                6
            //   59                   | pop                 ecx

        $sequence_2 = { e8???????? 8b1d???????? 50 ffd3 85c0 0f841c010000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8b1d????????         |                     
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   85c0                 | test                eax, eax
            //   0f841c010000         | je                  0x122

        $sequence_3 = { 56 57 68???????? 33ff 33f6 e8???????? 59 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   68????????           |                     
            //   33ff                 | xor                 edi, edi
            //   33f6                 | xor                 esi, esi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_4 = { 50 8d4d44 e8???????? 50 8d4d44 e8???????? 8d4d24 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d4d44               | lea                 ecx, [ebp + 0x44]
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d4d44               | lea                 ecx, [ebp + 0x44]
            //   e8????????           |                     
            //   8d4d24               | lea                 ecx, [ebp + 0x24]

        $sequence_5 = { e8???????? 8d4de0 c70424???????? e8???????? 8d4df0 e8???????? 8d45f0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   c70424????????       |                     
            //   e8????????           |                     
            //   8d4df0               | lea                 ecx, [ebp - 0x10]
            //   e8????????           |                     
            //   8d45f0               | lea                 eax, [ebp - 0x10]

        $sequence_6 = { ff75fc e8???????? 59 8bc6 f7d8 1bc0 25???????? }
            // n = 7, score = 100
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bc6                 | mov                 eax, esi
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   25????????           |                     

        $sequence_7 = { 59 8d4da8 e8???????? 8d4db8 e8???????? 8d4dc8 e8???????? }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8d4da8               | lea                 ecx, [ebp - 0x58]
            //   e8????????           |                     
            //   8d4db8               | lea                 ecx, [ebp - 0x48]
            //   e8????????           |                     
            //   8d4dc8               | lea                 ecx, [ebp - 0x38]
            //   e8????????           |                     

        $sequence_8 = { ff15???????? 85c0 7416 33c0 3bfb 7609 803430c7 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7416                 | je                  0x18
            //   33c0                 | xor                 eax, eax
            //   3bfb                 | cmp                 edi, ebx
            //   7609                 | jbe                 0xb
            //   803430c7             | xor                 byte ptr [eax + esi], 0xc7

        $sequence_9 = { 8d455c 50 8d4d4c e8???????? 8bc8 e8???????? 8d4d5c }
            // n = 7, score = 100
            //   8d455c               | lea                 eax, [ebp + 0x5c]
            //   50                   | push                eax
            //   8d4d4c               | lea                 ecx, [ebp + 0x4c]
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   8d4d5c               | lea                 ecx, [ebp + 0x5c]

    condition:
        7 of them and filesize < 458752
}
Download all Yara Rules