SYMBOLCOMMON_NAMEaka. SYNONYMS
win.chinotto (Back to overview)

Chinotto

Actor(s): APT37


There is no description at this point.

References
2021-11-29KasperskyGReAT
@online{great:20211129:scarcruft:986e7f4, author = {GReAT}, title = {{ScarCruft surveilling North Korean defectors and human rights activists}}, date = {2021-11-29}, organization = {Kaspersky}, url = {https://securelist.com/scarcruft-surveilling-north-korean-defectors-and-human-rights-activists/105074/}, language = {English}, urldate = {2021-12-07} } ScarCruft surveilling North Korean defectors and human rights activists
Chinotto Chinotto PoorWeb
Yara Rules
[TLP:WHITE] win_chinotto_auto (20220516 | Detects win.chinotto.)
rule win_chinotto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.chinotto."
        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.chinotto"
        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 = { 894644 83f808 7221 8d4900 8b4630 }
            // n = 5, score = 100
            //   894644               | mov                 dword ptr [esi + 0x44], eax
            //   83f808               | cmp                 eax, 8
            //   7221                 | jb                  0x23
            //   8d4900               | lea                 ecx, [ecx]
            //   8b4630               | mov                 eax, dword ptr [esi + 0x30]

        $sequence_1 = { 51 52 ffd0 83c410 85c0 742a }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   52                   | push                edx
            //   ffd0                 | call                eax
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   742a                 | je                  0x2c

        $sequence_2 = { 8b4604 03ca 13c7 83c116 13c7 3bc7 0f871a010000 }
            // n = 7, score = 100
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   03ca                 | add                 ecx, edx
            //   13c7                 | adc                 eax, edi
            //   83c116               | add                 ecx, 0x16
            //   13c7                 | adc                 eax, edi
            //   3bc7                 | cmp                 eax, edi
            //   0f871a010000         | ja                  0x120

        $sequence_3 = { 6a00 8bc6 898e88000000 e8???????? 83c404 85c0 }
            // n = 6, score = 100
            //   6a00                 | push                0
            //   8bc6                 | mov                 eax, esi
            //   898e88000000         | mov                 dword ptr [esi + 0x88], ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax

        $sequence_4 = { b90c000000 be???????? 8dbc2418020000 68d8010000 f3a5 8d8c244c020000 6a00 }
            // n = 7, score = 100
            //   b90c000000           | mov                 ecx, 0xc
            //   be????????           |                     
            //   8dbc2418020000       | lea                 edi, [esp + 0x218]
            //   68d8010000           | push                0x1d8
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8d8c244c020000       | lea                 ecx, [esp + 0x24c]
            //   6a00                 | push                0

        $sequence_5 = { 3bc2 720e 0f872bffffff 3bcf 0f8723ffffff 6a38 8d55ac }
            // n = 7, score = 100
            //   3bc2                 | cmp                 eax, edx
            //   720e                 | jb                  0x10
            //   0f872bffffff         | ja                  0xffffff31
            //   3bcf                 | cmp                 ecx, edi
            //   0f8723ffffff         | ja                  0xffffff29
            //   6a38                 | push                0x38
            //   8d55ac               | lea                 edx, [ebp - 0x54]

        $sequence_6 = { 7359 8b55f0 3bca 7202 8bca 8b7df4 8b5de4 }
            // n = 7, score = 100
            //   7359                 | jae                 0x5b
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   3bca                 | cmp                 ecx, edx
            //   7202                 | jb                  4
            //   8bca                 | mov                 ecx, edx
            //   8b7df4               | mov                 edi, dword ptr [ebp - 0xc]
            //   8b5de4               | mov                 ebx, dword ptr [ebp - 0x1c]

        $sequence_7 = { 7245 0fb6841dbcfeffff 8b4e44 0fbe92c4b44100 d3e0 43 }
            // n = 6, score = 100
            //   7245                 | jb                  0x47
            //   0fb6841dbcfeffff     | movzx               eax, byte ptr [ebp + ebx - 0x144]
            //   8b4e44               | mov                 ecx, dword ptr [esi + 0x44]
            //   0fbe92c4b44100       | movsx               edx, byte ptr [edx + 0x41b4c4]
            //   d3e0                 | shl                 eax, cl
            //   43                   | inc                 ebx

        $sequence_8 = { c1ea10 88561a 88461c c1e808 88461d 66c7461e0000 66c746200000 }
            // n = 7, score = 100
            //   c1ea10               | shr                 edx, 0x10
            //   88561a               | mov                 byte ptr [esi + 0x1a], dl
            //   88461c               | mov                 byte ptr [esi + 0x1c], al
            //   c1e808               | shr                 eax, 8
            //   88461d               | mov                 byte ptr [esi + 0x1d], al
            //   66c7461e0000         | mov                 word ptr [esi + 0x1e], 0
            //   66c746200000         | mov                 word ptr [esi + 0x20], 0

        $sequence_9 = { 6a06 89430c 8d4310 8d89a4ee4100 5a 668b31 668930 }
            // n = 7, score = 100
            //   6a06                 | push                6
            //   89430c               | mov                 dword ptr [ebx + 0xc], eax
            //   8d4310               | lea                 eax, [ebx + 0x10]
            //   8d89a4ee4100         | lea                 ecx, [ecx + 0x41eea4]
            //   5a                   | pop                 edx
            //   668b31               | mov                 si, word ptr [ecx]
            //   668930               | mov                 word ptr [eax], si

    condition:
        7 of them and filesize < 300032
}
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