SYMBOLCOMMON_NAMEaka. SYNONYMS
win.yayih (Back to overview)

yayih

aka: bbsinfo, aumlib

There is no description at this point.

References
2013-08-12FireEyeNart Villeneuve, Ned Moran
@online{villeneuve:20130812:survival:4544f24, author = {Nart Villeneuve and Ned Moran}, title = {{Survival of the Fittest: New York Times Attackers Evolve Quickly}}, date = {2013-08-12}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2013/08/survival-of-the-fittest-new-york-times-attackers-evolve-quickly.html}, language = {English}, urldate = {2019-12-20} } Survival of the Fittest: New York Times Attackers Evolve Quickly
yayih
Yara Rules
[TLP:WHITE] win_yayih_auto (20220808 | Detects win.yayih.)
rule win_yayih_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.yayih."
        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.yayih"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { bf04010000 8d85e8fbffff 57 50 68???????? ff15???????? }
            // n = 6, score = 100
            //   bf04010000           | mov                 edi, 0x104
            //   8d85e8fbffff         | lea                 eax, [ebp - 0x418]
            //   57                   | push                edi
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     

        $sequence_1 = { e8???????? 53 56 57 6a3f 33db }
            // n = 6, score = 100
            //   e8????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a3f                 | push                0x3f
            //   33db                 | xor                 ebx, ebx

        $sequence_2 = { ff750c 6a01 57 68???????? ff7508 ff55f8 85c0 }
            // n = 7, score = 100
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   6a01                 | push                1
            //   57                   | push                edi
            //   68????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff55f8               | call                dword ptr [ebp - 8]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 56 ff15???????? 8d8558f8ffff 68???????? 50 e8???????? }
            // n = 6, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8d8558f8ffff         | lea                 eax, [ebp - 0x7a8]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 5d c3 55 8bec b848470000 }
            // n = 5, score = 100
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   b848470000           | mov                 eax, 0x4748

        $sequence_5 = { c78578feffff94000000 50 ff15???????? 85c0 7512 68???????? }
            // n = 6, score = 100
            //   c78578feffff94000000     | mov    dword ptr [ebp - 0x188], 0x94
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7512                 | jne                 0x14
            //   68????????           |                     

        $sequence_6 = { ff15???????? 8d85b8b8ffff 68???????? 50 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   8d85b8b8ffff         | lea                 eax, [ebp - 0x4748]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_7 = { 57 50 8d85f0fcffff 50 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   8d85f0fcffff         | lea                 eax, [ebp - 0x310]
            //   50                   | push                eax

        $sequence_8 = { 6a06 ff35???????? ff15???????? 8b45f4 }
            // n = 4, score = 100
            //   6a06                 | push                6
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_9 = { ff15???????? ff35???????? ff15???????? 8d85b8b8ffff 68???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   8d85b8b8ffff         | lea                 eax, [ebp - 0x4748]
            //   68????????           |                     

    condition:
        7 of them and filesize < 57344
}
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