SYMBOLCOMMON_NAMEaka. SYNONYMS
win.dexbia (Back to overview)

Dexbia

aka: CONIME

Actor(s): Tonto Team


There is no description at this point.

References
2020-10-03Trend MicroJaromír Hořejší, Daniel Lunghi, Cedric Pernet, Kazuki Fujisawa
@techreport{hoej:20201003:earth:688aaf8, author = {Jaromír Hořejší and Daniel Lunghi and Cedric Pernet and Kazuki Fujisawa}, title = {{Earth Akhlut: Exploring the Tools, Tactics, and Procedures of an Advanced Threat Actor Operating a Large Infrastructure}}, date = {2020-10-03}, institution = {Trend Micro}, url = {https://vblocalhost.com/uploads/VB2020-Lunghi-Horejsi.pdf}, language = {English}, urldate = {2020-10-06} } Earth Akhlut: Exploring the Tools, Tactics, and Procedures of an Advanced Threat Actor Operating a Large Infrastructure
Dexbia TypeHash
Yara Rules
[TLP:WHITE] win_dexbia_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_dexbia_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.dexbia"
        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 = { 7410 8088????????20 8a9405ecfcffff ebe3 80a0a09e400000 40 41 }
            // n = 7, score = 200
            //   7410                 | je                  0x12
            //   8088????????20       |                     
            //   8a9405ecfcffff       | mov                 dl, byte ptr [ebp + eax - 0x314]
            //   ebe3                 | jmp                 0xffffffe5
            //   80a0a09e400000       | and                 byte ptr [eax + 0x409ea0], 0
            //   40                   | inc                 eax
            //   41                   | inc                 ecx

        $sequence_1 = { 53 ffd6 8b4c2410 51 ffd6 55 }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   ffd6                 | call                esi
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   55                   | push                ebp

        $sequence_2 = { b9ff090000 8dbc2455040000 88842454040000 f3ab 66ab aa }
            // n = 6, score = 200
            //   b9ff090000           | mov                 ecx, 0x9ff
            //   8dbc2455040000       | lea                 edi, [esp + 0x455]
            //   88842454040000       | mov                 byte ptr [esp + 0x454], al
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_3 = { 8d7c2471 be???????? f3ab 66ab }
            // n = 4, score = 200
            //   8d7c2471             | lea                 edi, [esp + 0x71]
            //   be????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax

        $sequence_4 = { 8b8424f8030000 85c0 7448 6a00 6a00 8d8424bc010000 6a00 }
            // n = 7, score = 200
            //   8b8424f8030000       | mov                 eax, dword ptr [esp + 0x3f8]
            //   85c0                 | test                eax, eax
            //   7448                 | je                  0x4a
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d8424bc010000       | lea                 eax, [esp + 0x1bc]
            //   6a00                 | push                0

        $sequence_5 = { 8d44241c 50 56 8974241c c74424242c020000 e8???????? }
            // n = 6, score = 200
            //   8d44241c             | lea                 eax, [esp + 0x1c]
            //   50                   | push                eax
            //   56                   | push                esi
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi
            //   c74424242c020000     | mov                 dword ptr [esp + 0x24], 0x22c
            //   e8????????           |                     

        $sequence_6 = { b9ff000000 33c0 8dbc24f9070000 c68424f807000000 }
            // n = 4, score = 200
            //   b9ff000000           | mov                 ecx, 0xff
            //   33c0                 | xor                 eax, eax
            //   8dbc24f9070000       | lea                 edi, [esp + 0x7f9]
            //   c68424f807000000     | mov                 byte ptr [esp + 0x7f8], 0

        $sequence_7 = { 6a00 ff15???????? 85c0 0f84f0000000 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f84f0000000         | je                  0xf6

        $sequence_8 = { 33c0 5b 81c46c010000 c3 57 ff15???????? 8bb42480010000 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   81c46c010000         | add                 esp, 0x16c
            //   c3                   | ret                 
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8bb42480010000       | mov                 esi, dword ptr [esp + 0x180]

        $sequence_9 = { 6a0a 52 6aff 68???????? 55 ffd0 }
            // n = 6, score = 200
            //   6a0a                 | push                0xa
            //   52                   | push                edx
            //   6aff                 | push                -1
            //   68????????           |                     
            //   55                   | push                ebp
            //   ffd0                 | call                eax

    condition:
        7 of them and filesize < 106496
}
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