SYMBOLCOMMON_NAMEaka. SYNONYMS
win.credraptor (Back to overview)

Credraptor


There is no description at this point.

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 (20200817 | autogenerated rule brought to you by yara-signator)
rule win_credraptor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        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.credraptor"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / 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 = { 894510 85c0 7510 53 e8???????? 83c404 5f }
            // n = 7, score = 100
            //   894510               | mov                 dword ptr [ebp + 0x10], eax
            //   85c0                 | test                eax, eax
            //   7510                 | jne                 0x12
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   5f                   | pop                 edi

        $sequence_1 = { d3e2 83c40c 897d90 85d0 7588 8bb570ffffff 8b4d88 }
            // n = 7, score = 100
            //   d3e2                 | shl                 edx, cl
            //   83c40c               | add                 esp, 0xc
            //   897d90               | mov                 dword ptr [ebp - 0x70], edi
            //   85d0                 | test                eax, edx
            //   7588                 | jne                 0xffffff8a
            //   8bb570ffffff         | mov                 esi, dword ptr [ebp - 0x90]
            //   8b4d88               | mov                 ecx, dword ptr [ebp - 0x78]

        $sequence_2 = { f7421800000800 8945fc 0f842e010000 8b4d0c 56 57 8b7910 }
            // n = 7, score = 100
            //   f7421800000800       | test                dword ptr [edx + 0x18], 0x80000
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   0f842e010000         | je                  0x134
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7910               | mov                 edi, dword ptr [ecx + 0x10]

        $sequence_3 = { 8d7da8 e8???????? 85c0 0f856f020000 8b4d0c 8b5940 e8???????? }
            // n = 7, score = 100
            //   8d7da8               | lea                 edi, [ebp - 0x58]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f856f020000         | jne                 0x275
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8b5940               | mov                 ebx, dword ptr [ecx + 0x40]
            //   e8????????           |                     

        $sequence_4 = { e8???????? 83c40c 03f3 8975dc e9???????? 8a0d???????? 8b55d8 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   03f3                 | add                 esi, ebx
            //   8975dc               | mov                 dword ptr [ebp - 0x24], esi
            //   e9????????           |                     
            //   8a0d????????         |                     
            //   8b55d8               | mov                 edx, dword ptr [ebp - 0x28]

        $sequence_5 = { ff4744 395514 8845ff 8b431c 0f94c2 52 50 }
            // n = 7, score = 100
            //   ff4744               | inc                 dword ptr [edi + 0x44]
            //   395514               | cmp                 dword ptr [ebp + 0x14], edx
            //   8845ff               | mov                 byte ptr [ebp - 1], al
            //   8b431c               | mov                 eax, dword ptr [ebx + 0x1c]
            //   0f94c2               | sete                dl
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_6 = { c6474501 e8???????? 83c408 5f 5e 5b 8be5 }
            // n = 7, score = 100
            //   c6474501             | mov                 byte ptr [edi + 0x45], 1
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp

        $sequence_7 = { e8???????? e9???????? 834e5820 e9???????? 8a4f0c 84c9 7513 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   e9????????           |                     
            //   834e5820             | or                  dword ptr [esi + 0x58], 0x20
            //   e9????????           |                     
            //   8a4f0c               | mov                 cl, byte ptr [edi + 0xc]
            //   84c9                 | test                cl, cl
            //   7513                 | jne                 0x15

        $sequence_8 = { c745e800000000 3bf3 0f83e7feffff 8a06 3c2d 7509 c745f0ffffffff }
            // n = 7, score = 100
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   3bf3                 | cmp                 esi, ebx
            //   0f83e7feffff         | jae                 0xfffffeed
            //   8a06                 | mov                 al, byte ptr [esi]
            //   3c2d                 | cmp                 al, 0x2d
            //   7509                 | jne                 0xb
            //   c745f0ffffffff       | mov                 dword ptr [ebp - 0x10], 0xffffffff

        $sequence_9 = { 8b0f 8b11 8b32 8b5f14 8d0c40 c1e105 e8???????? }
            // n = 7, score = 100
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   8b32                 | mov                 esi, dword ptr [edx]
            //   8b5f14               | mov                 ebx, dword ptr [edi + 0x14]
            //   8d0c40               | lea                 ecx, [eax + eax*2]
            //   c1e105               | shl                 ecx, 5
            //   e8????????           |                     

    condition:
        7 of them and filesize < 1728512
}
Download all Yara Rules