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 (20220516 | Detects win.montysthree.)
rule win_montysthree_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.montysthree."
        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.montysthree"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { ff15???????? 3bc7 7e07 8b0e }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   3bc7                 | cmp                 eax, edi
            //   7e07                 | jle                 9
            //   8b0e                 | mov                 ecx, dword ptr [esi]

        $sequence_1 = { e8???????? 8d4d18 e8???????? 83f804 7e26 834d6001 68???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8d4d18               | lea                 ecx, [ebp + 0x18]
            //   e8????????           |                     
            //   83f804               | cmp                 eax, 4
            //   7e26                 | jle                 0x28
            //   834d6001             | or                  dword ptr [ebp + 0x60], 1
            //   68????????           |                     

        $sequence_2 = { 89754c 7543 ff15???????? 8bf8 57 8d4d70 e8???????? }
            // n = 7, score = 200
            //   89754c               | mov                 dword ptr [ebp + 0x4c], esi
            //   7543                 | jne                 0x45
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   57                   | push                edi
            //   8d4d70               | lea                 ecx, [ebp + 0x70]
            //   e8????????           |                     

        $sequence_3 = { 397578 740b ff7578 8d4df8 e8???????? 8d4df8 897564 }
            // n = 7, score = 200
            //   397578               | cmp                 dword ptr [ebp + 0x78], esi
            //   740b                 | je                  0xd
            //   ff7578               | push                dword ptr [ebp + 0x78]
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   e8????????           |                     
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   897564               | mov                 dword ptr [ebp + 0x64], esi

        $sequence_4 = { e8???????? 83c40c 8bd8 8d442418 50 ff742418 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8bd8                 | mov                 ebx, eax
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   50                   | push                eax
            //   ff742418             | push                dword ptr [esp + 0x18]

        $sequence_5 = { 33db 3bc3 7539 ff15???????? 8bf0 56 8d4d08 }
            // n = 7, score = 200
            //   33db                 | xor                 ebx, ebx
            //   3bc3                 | cmp                 eax, ebx
            //   7539                 | jne                 0x3b
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   56                   | push                esi
            //   8d4d08               | lea                 ecx, [ebp + 8]

        $sequence_6 = { e8???????? ff35???????? e8???????? 53 8bf8 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   ff35????????         |                     
            //   e8????????           |                     
            //   53                   | push                ebx
            //   8bf8                 | mov                 edi, eax

        $sequence_7 = { e8???????? 59 57 e8???????? 59 8d4dd8 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]

        $sequence_8 = { 57 ff15???????? 33c9 6a02 40 5a f7e2 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ff15????????         |                     
            //   33c9                 | xor                 ecx, ecx
            //   6a02                 | push                2
            //   40                   | inc                 eax
            //   5a                   | pop                 edx
            //   f7e2                 | mul                 edx

        $sequence_9 = { 8bc1 83600800 83600c00 c700???????? c3 }
            // n = 5, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   83600800             | and                 dword ptr [eax + 8], 0
            //   83600c00             | and                 dword ptr [eax + 0xc], 0
            //   c700????????         |                     
            //   c3                   | ret                 

    condition:
        7 of them and filesize < 458752
}
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