SYMBOLCOMMON_NAMEaka. SYNONYMS
win.kegotip (Back to overview)

Kegotip


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References
2020-05-21Intel 471Intel 471
@online{471:20200521:brief:048d164, author = {Intel 471}, title = {{A brief history of TA505}}, date = {2020-05-21}, organization = {Intel 471}, url = {https://intel471.com/blog/a-brief-history-of-ta505}, language = {English}, urldate = {2022-02-14} } A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
Yara Rules
[TLP:WHITE] win_kegotip_auto (20221125 | Detects win.kegotip.)
rule win_kegotip_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.kegotip."
        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.kegotip"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { c785a8fcffff17000000 8d85a8fcffff 50 8d8df8feffff 51 }
            // n = 5, score = 600
            //   c785a8fcffff17000000     | mov    dword ptr [ebp - 0x358], 0x17
            //   8d85a8fcffff         | lea                 eax, [ebp - 0x358]
            //   50                   | push                eax
            //   8d8df8feffff         | lea                 ecx, [ebp - 0x108]
            //   51                   | push                ecx

        $sequence_1 = { 8b5508 8b45fc 3b02 751f 8b0d???????? 51 e8???????? }
            // n = 7, score = 600
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   3b02                 | cmp                 eax, dword ptr [edx]
            //   751f                 | jne                 0x21
            //   8b0d????????         |                     
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_2 = { 6a00 8d8dd8feffff 51 ff15???????? c745f80040e428 c745fc80050000 8d95c4feffff }
            // n = 7, score = 600
            //   6a00                 | push                0
            //   8d8dd8feffff         | lea                 ecx, [ebp - 0x128]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   c745f80040e428       | mov                 dword ptr [ebp - 8], 0x28e44000
            //   c745fc80050000       | mov                 dword ptr [ebp - 4], 0x580
            //   8d95c4feffff         | lea                 edx, [ebp - 0x13c]

        $sequence_3 = { e8???????? 837de400 7502 eb91 8d4df4 51 e8???????? }
            // n = 7, score = 600
            //   e8????????           |                     
            //   837de400             | cmp                 dword ptr [ebp - 0x1c], 0
            //   7502                 | jne                 4
            //   eb91                 | jmp                 0xffffff93
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_4 = { 6a00 8d85d4feffff 50 6804010000 8d8dd8feffff }
            // n = 5, score = 600
            //   6a00                 | push                0
            //   8d85d4feffff         | lea                 eax, [ebp - 0x12c]
            //   50                   | push                eax
            //   6804010000           | push                0x104
            //   8d8dd8feffff         | lea                 ecx, [ebp - 0x128]

        $sequence_5 = { 035588 0fb602 50 e8???????? }
            // n = 4, score = 600
            //   035588               | add                 edx, dword ptr [ebp - 0x78]
            //   0fb602               | movzx               eax, byte ptr [edx]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 83c408 8b55f0 c1ea02 8b4d0c 890491 }
            // n = 5, score = 600
            //   83c408               | add                 esp, 8
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   c1ea02               | shr                 edx, 2
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   890491               | mov                 dword ptr [ecx + edx*4], eax

        $sequence_7 = { 52 8b4508 50 8d4df4 51 6a00 68???????? }
            // n = 7, score = 600
            //   52                   | push                edx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_8 = { 50 8d4df4 51 6a00 68???????? 8b55f8 }
            // n = 6, score = 600
            //   50                   | push                eax
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   68????????           |                     
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]

        $sequence_9 = { 8b5510 33c0 0b55f0 0b45f4 8955f0 8945f4 6a00 }
            // n = 7, score = 600
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   33c0                 | xor                 eax, eax
            //   0b55f0               | or                  edx, dword ptr [ebp - 0x10]
            //   0b45f4               | or                  eax, dword ptr [ebp - 0xc]
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 278528
}
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