SYMBOLCOMMON_NAMEaka. SYNONYMS
win.zhcat (Back to overview)

ZhCat


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References
2016-04-06CylanceCylance
@techreport{cylance:20160406:operation:d4da7b5, author = {Cylance}, title = {{Operation Cleaver}}, date = {2016-04-06}, institution = {Cylance}, url = {https://www.cylance.com/content/dam/cylance/pages/operation-cleaver/Cylance_Operation_Cleaver_Report.pdf}, language = {English}, urldate = {2020-01-10} } Operation Cleaver
CsExt Jasus KAgent NetC PvzOut SynFlooder TinyZbot WndTest ZhCat ZhMimikatz Cleaver
Yara Rules
[TLP:WHITE] win_zhcat_auto (20220516 | Detects win.zhcat.)
rule win_zhcat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.zhcat."
        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.zhcat"
        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 = { 3b4d08 7ce6 eb08 6a0a ff15???????? 837e04ff 74f2 }
            // n = 7, score = 200
            //   3b4d08               | cmp                 ecx, dword ptr [ebp + 8]
            //   7ce6                 | jl                  0xffffffe8
            //   eb08                 | jmp                 0xa
            //   6a0a                 | push                0xa
            //   ff15????????         |                     
            //   837e04ff             | cmp                 dword ptr [esi + 4], -1
            //   74f2                 | je                  0xfffffff4

        $sequence_1 = { 66890c458c524100 40 ebe8 33c0 8945e4 3d01010000 7d0d }
            // n = 7, score = 200
            //   66890c458c524100     | mov                 word ptr [eax*2 + 0x41528c], cx
            //   40                   | inc                 eax
            //   ebe8                 | jmp                 0xffffffea
            //   33c0                 | xor                 eax, eax
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   3d01010000           | cmp                 eax, 0x101
            //   7d0d                 | jge                 0xf

        $sequence_2 = { c1f805 57 83e61f 8d3c8540604100 8b07 c1e606 }
            // n = 6, score = 200
            //   c1f805               | sar                 eax, 5
            //   57                   | push                edi
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8540604100       | lea                 edi, [eax*4 + 0x416040]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   c1e606               | shl                 esi, 6

        $sequence_3 = { e8???????? 83c414 eb55 be???????? 8d7de8 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   eb55                 | jmp                 0x57
            //   be????????           |                     
            //   8d7de8               | lea                 edi, [ebp - 0x18]

        $sequence_4 = { c1e006 03048d40604100 eb05 b8???????? f6402480 7414 e8???????? }
            // n = 7, score = 200
            //   c1e006               | shl                 eax, 6
            //   03048d40604100       | add                 eax, dword ptr [ecx*4 + 0x416040]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6402480             | test                byte ptr [eax + 0x24], 0x80
            //   7414                 | je                  0x16
            //   e8????????           |                     

        $sequence_5 = { 56 ff750c 68???????? 57 e8???????? 33f6 83c40c }
            // n = 7, score = 200
            //   56                   | push                esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   68????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   33f6                 | xor                 esi, esi
            //   83c40c               | add                 esp, 0xc

        $sequence_6 = { eb09 ff7510 ff15???????? ff751c 8945f4 8bc7 668945d0 }
            // n = 7, score = 200
            //   eb09                 | jmp                 0xb
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff15????????         |                     
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8bc7                 | mov                 eax, edi
            //   668945d0             | mov                 word ptr [ebp - 0x30], ax

        $sequence_7 = { 59 59 894508 85c0 0f8514ffffff 5f }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   85c0                 | test                eax, eax
            //   0f8514ffffff         | jne                 0xffffff1a
            //   5f                   | pop                 edi

        $sequence_8 = { 8d45f8 8d5dfc e8???????? 59 }
            // n = 4, score = 200
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   8d5dfc               | lea                 ebx, [ebp - 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_9 = { e8???????? 83c40c 6a00 03f3 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a00                 | push                0
            //   03f3                 | add                 esi, ebx

    condition:
        7 of them and filesize < 376832
}
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