SYMBOLCOMMON_NAMEaka. SYNONYMS
win.credraptor (Back to overview)

Credraptor


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References
2016-12-13ESET ResearchAnton Cherepanov
@online{cherepanov:20161213:rise:d6ee3c1, author = {Anton Cherepanov}, title = {{The rise of TeleBots: Analyzing disruptive KillDisk attacks}}, date = {2016-12-13}, organization = {ESET Research}, url = {http://www.welivesecurity.com/2016/12/13/rise-telebots-analyzing-disruptive-killdisk-attacks/}, language = {English}, urldate = {2019-12-20} } The rise of TeleBots: Analyzing disruptive KillDisk attacks
Credraptor KillDisk TeleBot TeleBots
Yara Rules
[TLP:WHITE] win_credraptor_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_credraptor_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.credraptor"
        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 = { fec9 895038 8b5508 80e164 897834 897048 884805 }
            // n = 7, score = 100
            //   fec9                 | dec                 cl
            //   895038               | mov                 dword ptr [eax + 0x38], edx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   80e164               | and                 cl, 0x64
            //   897834               | mov                 dword ptr [eax + 0x34], edi
            //   897048               | mov                 dword ptr [eax + 0x48], esi
            //   884805               | mov                 byte ptr [eax + 5], cl

        $sequence_1 = { c1f910 2500ff0000 0bc8 66894b42 897b44 397514 7413 }
            // n = 7, score = 100
            //   c1f910               | sar                 ecx, 0x10
            //   2500ff0000           | and                 eax, 0xff00
            //   0bc8                 | or                  ecx, eax
            //   66894b42             | mov                 word ptr [ebx + 0x42], cx
            //   897b44               | mov                 dword ptr [ebx + 0x44], edi
            //   397514               | cmp                 dword ptr [ebp + 0x14], esi
            //   7413                 | je                  0x15

        $sequence_2 = { e8???????? 83c404 8b5508 56 57 b909000000 8bf2 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   56                   | push                esi
            //   57                   | push                edi
            //   b909000000           | mov                 ecx, 9
            //   8bf2                 | mov                 esi, edx

        $sequence_3 = { c3 8bd8 8bc6 0fafc7 57 03c3 6a00 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   8bd8                 | mov                 ebx, eax
            //   8bc6                 | mov                 eax, esi
            //   0fafc7               | imul                eax, edi
            //   57                   | push                edi
            //   03c3                 | add                 eax, ebx
            //   6a00                 | push                0

        $sequence_4 = { c78578ffffff01000000 a810 7412 8b412c 8b8d78ffffff 8b0488 898558ffffff }
            // n = 7, score = 100
            //   c78578ffffff01000000     | mov    dword ptr [ebp - 0x88], 1
            //   a810                 | test                al, 0x10
            //   7412                 | je                  0x14
            //   8b412c               | mov                 eax, dword ptr [ecx + 0x2c]
            //   8b8d78ffffff         | mov                 ecx, dword ptr [ebp - 0x88]
            //   8b0488               | mov                 eax, dword ptr [eax + ecx*4]
            //   898558ffffff         | mov                 dword ptr [ebp - 0xa8], eax

        $sequence_5 = { 83e002 6a48 8945e4 8b4510 52 83e101 50 }
            // n = 7, score = 100
            //   83e002               | and                 eax, 2
            //   6a48                 | push                0x48
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   52                   | push                edx
            //   83e101               | and                 ecx, 1
            //   50                   | push                eax

        $sequence_6 = { e8???????? 8b5b14 83c40c 85db 0f850fffffff 8b45d8 85c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b5b14               | mov                 ebx, dword ptr [ebx + 0x14]
            //   83c40c               | add                 esp, 0xc
            //   85db                 | test                ebx, ebx
            //   0f850fffffff         | jne                 0xffffff15
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   85c0                 | test                eax, eax

        $sequence_7 = { eb0f b9???????? b8feffffff e8???????? 8b7d08 53 e8???????? }
            // n = 7, score = 100
            //   eb0f                 | jmp                 0x11
            //   b9????????           |                     
            //   b8feffffff           | mov                 eax, 0xfffffffe
            //   e8????????           |                     
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_8 = { e8???????? 8b45fc 8b4810 8b510c 0fb6424d 53 50 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b4810               | mov                 ecx, dword ptr [eax + 0x10]
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   0fb6424d             | movzx               eax, byte ptr [edx + 0x4d]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_9 = { 8d9d68ffffff e8???????? 8b8578ffffff 8b8d74ffffff 8b9570ffffff 50 51 }
            // n = 7, score = 100
            //   8d9d68ffffff         | lea                 ebx, [ebp - 0x98]
            //   e8????????           |                     
            //   8b8578ffffff         | mov                 eax, dword ptr [ebp - 0x88]
            //   8b8d74ffffff         | mov                 ecx, dword ptr [ebp - 0x8c]
            //   8b9570ffffff         | mov                 edx, dword ptr [ebp - 0x90]
            //   50                   | push                eax
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 1728512
}
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