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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_kegotip_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kegotip"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { f3a5 6804010000 6a00 8d8d90fdffff 51 e8???????? }
            // n = 6, score = 500
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   6804010000           | push                0x104
            //   6a00                 | push                0
            //   8d8d90fdffff         | lea                 ecx, [ebp - 0x270]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_1 = { 0fb74201 50 e8???????? 83c404 0fb6c8 85c9 7507 }
            // n = 7, score = 500
            //   0fb74201             | movzx               eax, word ptr [edx + 1]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   0fb6c8               | movzx               ecx, al
            //   85c9                 | test                ecx, ecx
            //   7507                 | jne                 9

        $sequence_2 = { 83f861 7c09 0fbe4d08 83f97a 7e1b 0fbe5508 83fa41 }
            // n = 7, score = 500
            //   83f861               | cmp                 eax, 0x61
            //   7c09                 | jl                  0xb
            //   0fbe4d08             | movsx               ecx, byte ptr [ebp + 8]
            //   83f97a               | cmp                 ecx, 0x7a
            //   7e1b                 | jle                 0x1d
            //   0fbe5508             | movsx               edx, byte ptr [ebp + 8]
            //   83fa41               | cmp                 edx, 0x41

        $sequence_3 = { ff15???????? 33c0 eb2d c745ec00000000 6a00 8d45ec 50 }
            // n = 7, score = 500
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   eb2d                 | jmp                 0x2f
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   6a00                 | push                0
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax

        $sequence_4 = { a1???????? 8945fc 8b4dfc c7014173646a }
            // n = 4, score = 500
            //   a1????????           |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   c7014173646a         | mov                 dword ptr [ecx], 0x6a647341

        $sequence_5 = { c745e401000000 c745dc00000000 eb09 8b45dc 83c001 8945dc 837ddc20 }
            // n = 7, score = 500
            //   c745e401000000       | mov                 dword ptr [ebp - 0x1c], 1
            //   c745dc00000000       | mov                 dword ptr [ebp - 0x24], 0
            //   eb09                 | jmp                 0xb
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   83c001               | add                 eax, 1
            //   8945dc               | mov                 dword ptr [ebp - 0x24], eax
            //   837ddc20             | cmp                 dword ptr [ebp - 0x24], 0x20

        $sequence_6 = { 8b95b0fdffff 83e210 7427 68???????? 8d85f0feffff 50 }
            // n = 6, score = 500
            //   8b95b0fdffff         | mov                 edx, dword ptr [ebp - 0x250]
            //   83e210               | and                 edx, 0x10
            //   7427                 | je                  0x29
            //   68????????           |                     
            //   8d85f0feffff         | lea                 eax, [ebp - 0x110]
            //   50                   | push                eax

        $sequence_7 = { ebd4 c745e800000000 eb12 8b55e8 }
            // n = 4, score = 500
            //   ebd4                 | jmp                 0xffffffd6
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   eb12                 | jmp                 0x14
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]

        $sequence_8 = { 8945f0 8955f4 8b5510 33c0 0b55f0 0b45f4 8955f0 }
            // n = 7, score = 500
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   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

        $sequence_9 = { 83ec1c 6a10 6a00 8b4508 50 e8???????? 83c40c }
            // n = 7, score = 500
            //   83ec1c               | sub                 esp, 0x1c
            //   6a10                 | push                0x10
            //   6a00                 | push                0
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

    condition:
        7 of them and filesize < 278528
}
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