SYMBOLCOMMON_NAMEaka. SYNONYMS
win.zeoticus (Back to overview)

Zeoticus


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References
2021-02-03SentinelOneJim Walter
@online{walter:20210203:zeoticus:b4fee76, author = {Jim Walter}, title = {{Zeoticus 2.0 | Ransomware With No C2 Required}}, date = {2021-02-03}, organization = {SentinelOne}, url = {https://labs.sentinelone.com/zeoticus-2-0-ransomware-with-no-c2-required/}, language = {English}, urldate = {2021-02-04} } Zeoticus 2.0 | Ransomware With No C2 Required
Zeoticus
Yara Rules
[TLP:WHITE] win_zeoticus_auto (20220516 | Detects win.zeoticus.)
rule win_zeoticus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.zeoticus."
        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.zeoticus"
        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 = { 660fd4c6 0f294c2430 660f6e4c2440 660fd4c5 660f6e742444 0f29442450 660f6ec7 }
            // n = 7, score = 100
            //   660fd4c6             | paddq               xmm0, xmm6
            //   0f294c2430           | movaps              xmmword ptr [esp + 0x30], xmm1
            //   660f6e4c2440         | movd                xmm1, dword ptr [esp + 0x40]
            //   660fd4c5             | paddq               xmm0, xmm5
            //   660f6e742444         | movd                xmm6, dword ptr [esp + 0x44]
            //   0f29442450           | movaps              xmmword ptr [esp + 0x50], xmm0
            //   660f6ec7             | movd                xmm0, edi

        $sequence_1 = { c705????????00000000 c705????????00000000 e8???????? a1???????? 6a03 68???????? 6a0d }
            // n = 7, score = 100
            //   c705????????00000000     |     
            //   c705????????00000000     |     
            //   e8????????           |                     
            //   a1????????           |                     
            //   6a03                 | push                3
            //   68????????           |                     
            //   6a0d                 | push                0xd

        $sequence_2 = { 50 ff15???????? 50 8d842488000000 50 56 ff15???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8d842488000000       | lea                 eax, [esp + 0x88]
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_3 = { 0f28c3 660fefc2 0f28e8 660fd4e8 660f73d03f 660fefe8 0f28c1 }
            // n = 7, score = 100
            //   0f28c3               | movaps              xmm0, xmm3
            //   660fefc2             | pxor                xmm0, xmm2
            //   0f28e8               | movaps              xmm5, xmm0
            //   660fd4e8             | paddq               xmm5, xmm0
            //   660f73d03f           | psrlq               xmm0, 0x3f
            //   660fefe8             | pxor                xmm5, xmm0
            //   0f28c1               | movaps              xmm0, xmm1

        $sequence_4 = { 8b4df0 8bd7 8b7dc4 c1e71a 894208 8b45c8 2bc6 }
            // n = 7, score = 100
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   8bd7                 | mov                 edx, edi
            //   8b7dc4               | mov                 edi, dword ptr [ebp - 0x3c]
            //   c1e71a               | shl                 edi, 0x1a
            //   894208               | mov                 dword ptr [edx + 8], eax
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   2bc6                 | sub                 eax, esi

        $sequence_5 = { 0f29a424d0000000 660f6ebc24ac000000 0f28de 0f286c2430 660f6ed6 660f6ec7 660f6ec9 }
            // n = 7, score = 100
            //   0f29a424d0000000     | movaps              xmmword ptr [esp + 0xd0], xmm4
            //   660f6ebc24ac000000     | movd    xmm7, dword ptr [esp + 0xac]
            //   0f28de               | movaps              xmm3, xmm6
            //   0f286c2430           | movaps              xmm5, xmmword ptr [esp + 0x30]
            //   660f6ed6             | movd                xmm2, esi
            //   660f6ec7             | movd                xmm0, edi
            //   660f6ec9             | movd                xmm1, ecx

        $sequence_6 = { 83c404 8d4928 53 e8???????? 83c404 8d9698030000 }
            // n = 6, score = 100
            //   83c404               | add                 esp, 4
            //   8d4928               | lea                 ecx, [ecx + 0x28]
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d9698030000         | lea                 edx, [esi + 0x398]

        $sequence_7 = { 57 50 8b44244c 48 50 e8???????? e9???????? }
            // n = 7, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   8b44244c             | mov                 eax, dword ptr [esp + 0x4c]
            //   48                   | dec                 eax
            //   50                   | push                eax
            //   e8????????           |                     
            //   e9????????           |                     

        $sequence_8 = { 89542450 13842414010000 8b542418 03d1 897c2474 8b4c2424 13c8 }
            // n = 7, score = 100
            //   89542450             | mov                 dword ptr [esp + 0x50], edx
            //   13842414010000       | adc                 eax, dword ptr [esp + 0x114]
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   03d1                 | add                 edx, ecx
            //   897c2474             | mov                 dword ptr [esp + 0x74], edi
            //   8b4c2424             | mov                 ecx, dword ptr [esp + 0x24]
            //   13c8                 | adc                 ecx, eax

        $sequence_9 = { 0f84ac000000 8b4d24 ff7514 8b5520 ff7510 8b01 8b751c }
            // n = 7, score = 100
            //   0f84ac000000         | je                  0xb2
            //   8b4d24               | mov                 ecx, dword ptr [ebp + 0x24]
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   8b5520               | mov                 edx, dword ptr [ebp + 0x20]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   8b751c               | mov                 esi, dword ptr [ebp + 0x1c]

    condition:
        7 of them and filesize < 468992
}
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