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 (20210616 | Detects win.kegotip.)
rule win_kegotip_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 7438 8d8d7cffffff 51 ff15???????? 898574ffffff }
            // n = 5, score = 600
            //   7438                 | je                  0x3a
            //   8d8d7cffffff         | lea                 ecx, dword ptr [ebp - 0x84]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   898574ffffff         | mov                 dword ptr [ebp - 0x8c], eax

        $sequence_1 = { 6800900100 6a00 6a00 681f000f00 8b45f4 50 ff15???????? }
            // n = 7, score = 600
            //   6800900100           | push                0x19000
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   681f000f00           | push                0xf001f
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_2 = { 8d95b0feffff 52 6a00 8d85d8feffff 50 ff15???????? }
            // n = 6, score = 600
            //   8d95b0feffff         | lea                 edx, dword ptr [ebp - 0x150]
            //   52                   | push                edx
            //   6a00                 | push                0
            //   8d85d8feffff         | lea                 eax, dword ptr [ebp - 0x128]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_3 = { 8945dc 8b4ddc 3b4df0 773d 8b5508 }
            // n = 5, score = 600
            //   8945dc               | mov                 dword ptr [ebp - 0x24], eax
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   3b4df0               | cmp                 ecx, dword ptr [ebp - 0x10]
            //   773d                 | ja                  0x3f
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]

        $sequence_4 = { 85d2 0f848f000000 8b45f8 0fbe08 }
            // n = 4, score = 600
            //   85d2                 | test                edx, edx
            //   0f848f000000         | je                  0x95
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   0fbe08               | movsx               ecx, byte ptr [eax]

        $sequence_5 = { c645f701 ebb2 8b5508 0355ec 817a017777772e 7504 32c0 }
            // n = 7, score = 600
            //   c645f701             | mov                 byte ptr [ebp - 9], 1
            //   ebb2                 | jmp                 0xffffffb4
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0355ec               | add                 edx, dword ptr [ebp - 0x14]
            //   817a017777772e       | cmp                 dword ptr [edx + 1], 0x2e777777
            //   7504                 | jne                 6
            //   32c0                 | xor                 al, al

        $sequence_6 = { 52 6a03 8b4508 50 ff15???????? 8945fc }
            // n = 6, score = 600
            //   52                   | push                edx
            //   6a03                 | push                3
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 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, dword ptr [ebp - 0xc]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_8 = { 740e 8b450c 50 ff15???????? 85c0 7506 }
            // n = 6, score = 600
            //   740e                 | je                  0x10
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7506                 | jne                 8

        $sequence_9 = { 83c40c 8d8d48fbffff 51 8d9588fcffff 52 }
            // n = 5, score = 600
            //   83c40c               | add                 esp, 0xc
            //   8d8d48fbffff         | lea                 ecx, dword ptr [ebp - 0x4b8]
            //   51                   | push                ecx
            //   8d9588fcffff         | lea                 edx, dword ptr [ebp - 0x378]
            //   52                   | push                edx

    condition:
        7 of them and filesize < 278528
}
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