SYMBOLCOMMON_NAMEaka. SYNONYMS
win.kikothac (Back to overview)

Kikothac


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References
2019-08Group-IBGroup-IB
@online{groupib:201908:attacks:9da5611, author = {Group-IB}, title = {{Attacks by Silence}}, date = {2019-08}, organization = {Group-IB}, url = {https://www.group-ib.com/resources/threat-research/silence.html}, language = {English}, urldate = {2020-01-07} } Attacks by Silence
Silence DDoS Kikothac Silence
Yara Rules
[TLP:WHITE] win_kikothac_auto (20220808 | Detects win.kikothac.)
rule win_kikothac_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.kikothac."
        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.kikothac"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 896c2408 e8???????? 6689d8 30e4 d2c4 668b46fe }
            // n = 6, score = 200
            //   896c2408             | mov                 dword ptr [esp + 8], ebp
            //   e8????????           |                     
            //   6689d8               | mov                 ax, bx
            //   30e4                 | xor                 ah, ah
            //   d2c4                 | rol                 ah, cl
            //   668b46fe             | mov                 ax, word ptr [esi - 2]

        $sequence_1 = { d2f6 660fbed3 f6d8 08da f6d0 d2c2 }
            // n = 6, score = 200
            //   d2f6                 | sal                 dh, cl
            //   660fbed3             | movsx               dx, bl
            //   f6d8                 | neg                 al
            //   08da                 | or                  dl, bl
            //   f6d0                 | not                 al
            //   d2c2                 | rol                 dl, cl

        $sequence_2 = { 3bf0 7ce2 33c0 837dfc03 5e 0f94c0 5b }
            // n = 7, score = 200
            //   3bf0                 | cmp                 esi, eax
            //   7ce2                 | jl                  0xffffffe4
            //   33c0                 | xor                 eax, eax
            //   837dfc03             | cmp                 dword ptr [ebp - 4], 3
            //   5e                   | pop                 esi
            //   0f94c0               | sete                al
            //   5b                   | pop                 ebx

        $sequence_3 = { 8d8d00f8ffff 51 ffd7 68???????? 8d9500f8ffff 52 ffd7 }
            // n = 7, score = 200
            //   8d8d00f8ffff         | lea                 ecx, [ebp - 0x800]
            //   51                   | push                ecx
            //   ffd7                 | call                edi
            //   68????????           |                     
            //   8d9500f8ffff         | lea                 edx, [ebp - 0x800]
            //   52                   | push                edx
            //   ffd7                 | call                edi

        $sequence_4 = { 660fce 660fbef2 894c2448 660fce 9c 66f7d6 }
            // n = 6, score = 200
            //   660fce               | bswap               si
            //   660fbef2             | movsx               si, dl
            //   894c2448             | mov                 dword ptr [esp + 0x48], ecx
            //   660fce               | bswap               si
            //   9c                   | pushfd              
            //   66f7d6               | not                 si

        $sequence_5 = { 0f8eeb040000 55 ff742404 8f4500 ff3424 }
            // n = 5, score = 200
            //   0f8eeb040000         | jle                 0x4f1
            //   55                   | push                ebp
            //   ff742404             | push                dword ptr [esp + 4]
            //   8f4500               | pop                 dword ptr [ebp]
            //   ff3424               | push                dword ptr [esp]

        $sequence_6 = { e8???????? 3d33270000 74db 33c0 5f 5e 5b }
            // n = 7, score = 200
            //   e8????????           |                     
            //   3d33270000           | cmp                 eax, 0x2733
            //   74db                 | je                  0xffffffdd
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_7 = { 7460 53 8b1d???????? 8d9b00000000 8b45fc 50 6a00 }
            // n = 7, score = 200
            //   7460                 | je                  0x62
            //   53                   | push                ebx
            //   8b1d????????         |                     
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_8 = { 52 6820040000 57 57 }
            // n = 4, score = 200
            //   52                   | push                edx
            //   6820040000           | push                0x420
            //   57                   | push                edi
            //   57                   | push                edi

        $sequence_9 = { 68???????? ffd6 a1???????? 6a00 6a01 50 }
            // n = 6, score = 200
            //   68????????           |                     
            //   ffd6                 | call                esi
            //   a1????????           |                     
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   50                   | push                eax

    condition:
        7 of them and filesize < 581632
}
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