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://blog.intel471.com/2020/05/21/a-brief-history-of-ta505/}, language = {English}, urldate = {2020-05-23} } 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 (20200529 | autogenerated rule brought to you by yara-signator)
rule win_kegotip_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kegotip"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 51 e8???????? 83c408 8b550c 83ea03 }
            // n = 5, score = 600
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   83ea03               | sub                 edx, 3

        $sequence_1 = { 52 e8???????? 83c404 3945f4 7335 6a04 8b4508 }
            // n = 7, score = 600
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   3945f4               | cmp                 dword ptr [ebp - 0xc], eax
            //   7335                 | jae                 0x37
            //   6a04                 | push                4
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_2 = { 8b4508 0345f8 0fbe08 83f930 7c26 }
            // n = 5, score = 600
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   0345f8               | add                 eax, dword ptr [ebp - 8]
            //   0fbe08               | movsx               ecx, byte ptr [eax]
            //   83f930               | cmp                 ecx, 0x30
            //   7c26                 | jl                  0x28

        $sequence_3 = { c78570ffffff01000000 8b9570ffffff 895580 8b4580 6bc014 }
            // n = 5, score = 600
            //   c78570ffffff01000000     | mov    dword ptr [ebp - 0x90], 1
            //   8b9570ffffff         | mov                 edx, dword ptr [ebp - 0x90]
            //   895580               | mov                 dword ptr [ebp - 0x80], edx
            //   8b4580               | mov                 eax, dword ptr [ebp - 0x80]
            //   6bc014               | imul                eax, eax, 0x14

        $sequence_4 = { 8945e8 837de804 7333 6aff e8???????? 83c404 }
            // n = 6, score = 600
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   837de804             | cmp                 dword ptr [ebp - 0x18], 4
            //   7333                 | jae                 0x35
            //   6aff                 | push                -1
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_5 = { 0fbe02 83f846 7e09 8b4df8 83e906 }
            // n = 5, score = 600
            //   0fbe02               | movsx               eax, byte ptr [edx]
            //   83f846               | cmp                 eax, 0x46
            //   7e09                 | jle                 0xb
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   83e906               | sub                 ecx, 6

        $sequence_6 = { 68???????? 64a100000000 50 64892500000000 81c4e4feffff 53 }
            // n = 6, score = 600
            //   68????????           |                     
            //   64a100000000         | mov                 eax, dword ptr fs:[0]
            //   50                   | push                eax
            //   64892500000000       | mov                 dword ptr fs:[0], esp
            //   81c4e4feffff         | add                 esp, 0xfffffee4
            //   53                   | push                ebx

        $sequence_7 = { eba1 6800800000 6a00 8b4dfc 51 ff15???????? b001 }
            // n = 7, score = 600
            //   eba1                 | jmp                 0xffffffa3
            //   6800800000           | push                0x8000
            //   6a00                 | push                0
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   b001                 | mov                 al, 1

        $sequence_8 = { 0fb64dff 85c9 7520 8b15???????? 52 }
            // n = 5, score = 600
            //   0fb64dff             | movzx               ecx, byte ptr [ebp - 1]
            //   85c9                 | test                ecx, ecx
            //   7520                 | jne                 0x22
            //   8b15????????         |                     
            //   52                   | push                edx

        $sequence_9 = { ff15???????? 898538f7ffff 83bd38f7ffff00 0f8484000000 6a00 6a00 6a00 }
            // n = 7, score = 600
            //   ff15????????         |                     
            //   898538f7ffff         | mov                 dword ptr [ebp - 0x8c8], eax
            //   83bd38f7ffff00       | cmp                 dword ptr [ebp - 0x8c8], 0
            //   0f8484000000         | je                  0x8a
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 278528
}
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