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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_ruckguv_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 03ce 0111 ff45fc 83450802 397dfc 72ba }
            // n = 6, score = 200
            //   03ce                 | add                 ecx, esi
            //   0111                 | add                 dword ptr [ecx], edx
            //   ff45fc               | inc                 dword ptr [ebp - 4]
            //   83450802             | add                 dword ptr [ebp + 8], 2
            //   397dfc               | cmp                 dword ptr [ebp - 4], edi
            //   72ba                 | jb                  0xffffffbc

        $sequence_1 = { 50 68???????? e8???????? 6814f1f808 6a01 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   6814f1f808           | push                0x8f8f114
            //   6a01                 | push                1

        $sequence_2 = { 51 ffd0 8bf0 3bf3 7508 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   8bf0                 | mov                 esi, eax
            //   3bf3                 | cmp                 esi, ebx
            //   7508                 | jne                 0xa

        $sequence_3 = { 0fb645fe 03c1 8a18 fe45ff 881e }
            // n = 5, score = 200
            //   0fb645fe             | movzx               eax, byte ptr [ebp - 2]
            //   03c1                 | add                 eax, ecx
            //   8a18                 | mov                 bl, byte ptr [eax]
            //   fe45ff               | inc                 byte ptr [ebp - 1]
            //   881e                 | mov                 byte ptr [esi], bl

        $sequence_4 = { 7583 5e 5f 33c0 }
            // n = 4, score = 200
            //   7583                 | jne                 0xffffff85
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { 8d8da0feffff 51 ffd0 8d85a0feffff 50 68???????? }
            // n = 6, score = 200
            //   8d8da0feffff         | lea                 ecx, [ebp - 0x160]
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   8d85a0feffff         | lea                 eax, [ebp - 0x160]
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_6 = { 6814f1f808 6a01 897558 e8???????? }
            // n = 4, score = 200
            //   6814f1f808           | push                0x8f8f114
            //   6a01                 | push                1
            //   897558               | mov                 dword ptr [ebp + 0x58], esi
            //   e8????????           |                     

        $sequence_7 = { 6a01 e8???????? 83c40c 8d8da0feffff 51 ffd0 }
            // n = 6, score = 200
            //   6a01                 | push                1
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d8da0feffff         | lea                 ecx, [ebp - 0x160]
            //   51                   | push                ecx
            //   ffd0                 | call                eax

        $sequence_8 = { 3bf3 7508 83c8ff e9???????? 6866bd7db8 6a06 }
            // n = 6, score = 200
            //   3bf3                 | cmp                 esi, ebx
            //   7508                 | jne                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   6866bd7db8           | push                0xb87dbd66
            //   6a06                 | push                6

        $sequence_9 = { c745a444000000 668945d4 e8???????? 59 59 8d4d2c }
            // n = 6, score = 200
            //   c745a444000000       | mov                 dword ptr [ebp - 0x5c], 0x44
            //   668945d4             | mov                 word ptr [ebp - 0x2c], ax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   8d4d2c               | lea                 ecx, [ebp + 0x2c]

    condition:
        7 of them and filesize < 41024
}
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