SYMBOLCOMMON_NAMEaka. SYNONYMS
win.broler (Back to overview)

BROLER

aka: down_new

Actor(s): Tick


There is no description at this point.

References
2019-11-29Trend MicroJoey Chen, Hiroyuki Kakara, Masaoki Shoji
@techreport{chen:20191129:operation:16f5aaa, author = {Joey Chen and Hiroyuki Kakara and Masaoki Shoji}, title = {{Operation ENDTRADE:TICK: 2019s Multi-Stage Backdoors for Attacking Industries and Stealing Classified Data}}, date = {2019-11-29}, institution = {Trend Micro}, url = {https://documents.trendmicro.com/assets/pdf/Operation-ENDTRADE-TICK-s-Multi-Stage-Backdoors-for-Attacking-Industries-and-Stealing-Classified-Data.pdf}, language = {English}, urldate = {2020-06-02} } Operation ENDTRADE:TICK: 2019s Multi-Stage Backdoors for Attacking Industries and Stealing Classified Data
BROLER
Yara Rules
[TLP:WHITE] win_broler_auto (20230125 | Detects win.broler.)
rule win_broler_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.broler."
        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.broler"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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???????? 8d45e0 50 c745e05c324100 }
            // n = 4, score = 100
            //   68????????           |                     
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   c745e05c324100       | mov                 dword ptr [ebp - 0x20], 0x41325c

        $sequence_1 = { 720f 8b8d8cfeffff 51 e8???????? 83c404 68e8030000 ff15???????? }
            // n = 7, score = 100
            //   720f                 | jb                  0x11
            //   8b8d8cfeffff         | mov                 ecx, dword ptr [ebp - 0x174]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   68e8030000           | push                0x3e8
            //   ff15????????         |                     

        $sequence_2 = { 33049d08784100 8b5dfc 3343fc 8bd9 8945f4 c1fb10 81e3ff000000 }
            // n = 7, score = 100
            //   33049d08784100       | xor                 eax, dword ptr [ebx*4 + 0x417808]
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]
            //   3343fc               | xor                 eax, dword ptr [ebx - 4]
            //   8bd9                 | mov                 ebx, ecx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   c1fb10               | sar                 ebx, 0x10
            //   81e3ff000000         | and                 ebx, 0xff

        $sequence_3 = { ff15???????? 6a00 8d8568edffff 50 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   8d8568edffff         | lea                 eax, [ebp - 0x1298]
            //   50                   | push                eax

        $sequence_4 = { 897de8 895de4 885dd4 720c 8b4508 50 }
            // n = 6, score = 100
            //   897de8               | mov                 dword ptr [ebp - 0x18], edi
            //   895de4               | mov                 dword ptr [ebp - 0x1c], ebx
            //   885dd4               | mov                 byte ptr [ebp - 0x2c], bl
            //   720c                 | jb                  0xe
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax

        $sequence_5 = { 8d75b8 e8???????? c645fc01 8b4518 8d7310 3bc3 730a }
            // n = 7, score = 100
            //   8d75b8               | lea                 esi, [ebp - 0x48]
            //   e8????????           |                     
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   8b4518               | mov                 eax, dword ptr [ebp + 0x18]
            //   8d7310               | lea                 esi, [ebx + 0x10]
            //   3bc3                 | cmp                 eax, ebx
            //   730a                 | jae                 0xc

        $sequence_6 = { b8???????? 8db5d4fdffff c785e8fdffff0f000000 899de4fdffff 889dd4fdffff e8???????? bf01000000 }
            // n = 7, score = 100
            //   b8????????           |                     
            //   8db5d4fdffff         | lea                 esi, [ebp - 0x22c]
            //   c785e8fdffff0f000000     | mov    dword ptr [ebp - 0x218], 0xf
            //   899de4fdffff         | mov                 dword ptr [ebp - 0x21c], ebx
            //   889dd4fdffff         | mov                 byte ptr [ebp - 0x22c], bl
            //   e8????????           |                     
            //   bf01000000           | mov                 edi, 1

        $sequence_7 = { e9???????? 50 8d459c 50 e8???????? 897dfc 8b75ac }
            // n = 7, score = 100
            //   e9????????           |                     
            //   50                   | push                eax
            //   8d459c               | lea                 eax, [ebp - 0x64]
            //   50                   | push                eax
            //   e8????????           |                     
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   8b75ac               | mov                 esi, dword ptr [ebp - 0x54]

        $sequence_8 = { 0fb67003 0fb65809 57 0fb67805 0bce }
            // n = 5, score = 100
            //   0fb67003             | movzx               esi, byte ptr [eax + 3]
            //   0fb65809             | movzx               ebx, byte ptr [eax + 9]
            //   57                   | push                edi
            //   0fb67805             | movzx               edi, byte ptr [eax + 5]
            //   0bce                 | or                  ecx, esi

        $sequence_9 = { 85c0 7505 e8???????? 8d855cfeffff 50 8d8d74feffff 51 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   e8????????           |                     
            //   8d855cfeffff         | lea                 eax, [ebp - 0x1a4]
            //   50                   | push                eax
            //   8d8d74feffff         | lea                 ecx, [ebp - 0x18c]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 275456
}
Download all Yara Rules