SYMBOLCOMMON_NAMEaka. SYNONYMS
win.ruckguv (Back to overview)

Ruckguv


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References
2016-05-12ProofpointAxel F, Matthew Mesa
@online{f:20160512:hancitor:9c250c0, author = {Axel F and Matthew Mesa}, title = {{Hancitor and Ruckguv Reappear, Updated and With Vawtrak On Deck}}, date = {2016-05-12}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/hancitor-ruckguv-reappear}, language = {English}, urldate = {2019-12-20} } Hancitor and Ruckguv Reappear, Updated and With Vawtrak On Deck
Hancitor Ruckguv
Yara Rules
[TLP:WHITE] win_ruckguv_auto (20210616 | Detects win.ruckguv.)
rule win_ruckguv_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.ruckguv."
        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.ruckguv"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 8d4d48 51 ffd0 683adc703d }
            // n = 4, score = 200
            //   8d4d48               | lea                 ecx, dword ptr [ebp + 0x48]
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   683adc703d           | push                0x3d70dc3a

        $sequence_1 = { 59 6a10 8d4d2c 51 ffd0 }
            // n = 5, score = 200
            //   59                   | pop                 ecx
            //   6a10                 | push                0x10
            //   8d4d2c               | lea                 ecx, dword ptr [ebp + 0x2c]
            //   51                   | push                ecx
            //   ffd0                 | call                eax

        $sequence_2 = { 7908 49 81c900f0ffff 41 0fb7c9 }
            // n = 5, score = 200
            //   7908                 | jns                 0xa
            //   49                   | dec                 ecx
            //   81c900f0ffff         | or                  ecx, 0xfffff000
            //   41                   | inc                 ecx
            //   0fb7c9               | movzx               ecx, cx

        $sequence_3 = { 57 e8???????? 56 ff15???????? cc 55 8bec }
            // n = 7, score = 200
            //   57                   | push                edi
            //   e8????????           |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   cc                   | int3                
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_4 = { 8bec 51 53 8b5d08 8b433c 03c3 }
            // n = 6, score = 200
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   8b433c               | mov                 eax, dword ptr [ebx + 0x3c]
            //   03c3                 | add                 eax, ebx

        $sequence_5 = { 8b55fc 03ca 890419 eb02 8906 83c604 8345fc04 }
            // n = 7, score = 200
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   03ca                 | add                 ecx, edx
            //   890419               | mov                 dword ptr [ecx + ebx], eax
            //   eb02                 | jmp                 4
            //   8906                 | mov                 dword ptr [esi], eax
            //   83c604               | add                 esi, 4
            //   8345fc04             | add                 dword ptr [ebp - 4], 4

        $sequence_6 = { 7437 48 742f 48 7427 48 741f }
            // n = 7, score = 200
            //   7437                 | je                  0x39
            //   48                   | dec                 eax
            //   742f                 | je                  0x31
            //   48                   | dec                 eax
            //   7427                 | je                  0x29
            //   48                   | dec                 eax
            //   741f                 | je                  0x21

        $sequence_7 = { ffd0 8945f4 83f8ff 7511 ff75f8 e8???????? 6aff }
            // n = 7, score = 200
            //   ffd0                 | call                eax
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   83f8ff               | cmp                 eax, -1
            //   7511                 | jne                 0x13
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   e8????????           |                     
            //   6aff                 | push                -1

        $sequence_8 = { 53 6a00 ffd0 8bd8 895dfc }
            // n = 5, score = 200
            //   53                   | push                ebx
            //   6a00                 | push                0
            //   ffd0                 | call                eax
            //   8bd8                 | mov                 ebx, eax
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx

        $sequence_9 = { 53 8d8d9cfdffff 51 ffd0 56 }
            // n = 5, score = 200
            //   53                   | push                ebx
            //   8d8d9cfdffff         | lea                 ecx, dword ptr [ebp - 0x264]
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   56                   | push                esi

    condition:
        7 of them and filesize < 41024
}
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