SYMBOLCOMMON_NAMEaka. SYNONYMS
win.corebot (Back to overview)

Corebot


There is no description at this point.

References
2016-08-01CrowdStrikeAdam Meyers
@online{meyers:20160801:crowdstrikes:9926803, author = {Adam Meyers}, title = {{CrowdStrike’s New Methodology for Tracking eCrime}}, date = {2016-08-01}, organization = {CrowdStrike}, url = {https://www.crowdstrike.com/blog/ecrime-ecosystem/}, language = {English}, urldate = {2021-05-31} } CrowdStrike’s New Methodology for Tracking eCrime
Corebot BOSON SPIDER
2016CrowdStrikeCrowdStrike
@techreport{crowdstrike:2016:intelligence:574f45c, author = {CrowdStrike}, title = {{Intelligence Report: Emergence and Development of Core Bot}}, date = {2016}, institution = {CrowdStrike}, url = {https://go.crowdstrike.com/rs/281-OBQ-266/images/Report_BosonSpider.pdf}, language = {English}, urldate = {2021-05-31} } Intelligence Report: Emergence and Development of Core Bot
Corebot BOSON SPIDER
Yara Rules
[TLP:WHITE] win_corebot_auto (20220516 | Detects win.corebot.)
rule win_corebot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.corebot."
        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.corebot"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 57 56 89ce 31db }
            // n = 4, score = 1100
            //   57                   | push                edi
            //   56                   | push                esi
            //   89ce                 | mov                 esi, ecx
            //   31db                 | xor                 ebx, ebx

        $sequence_1 = { 8b4514 8b4d10 8b55f0 8911 8930 }
            // n = 5, score = 1100
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8911                 | mov                 dword ptr [ecx], edx
            //   8930                 | mov                 dword ptr [eax], esi

        $sequence_2 = { 31c0 5e 5d c20800 55 89e5 }
            // n = 6, score = 1100
            //   31c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   55                   | push                ebp
            //   89e5                 | mov                 ebp, esp

        $sequence_3 = { 8b4110 83c110 eb24 8b4104 8d70ff }
            // n = 5, score = 1100
            //   8b4110               | mov                 eax, dword ptr [ecx + 0x10]
            //   83c110               | add                 ecx, 0x10
            //   eb24                 | jmp                 0x26
            //   8b4104               | mov                 eax, dword ptr [ecx + 4]
            //   8d70ff               | lea                 esi, [eax - 1]

        $sequence_4 = { 89e5 56 89ce 8b4604 }
            // n = 4, score = 1100
            //   89e5                 | mov                 ebp, esp
            //   56                   | push                esi
            //   89ce                 | mov                 esi, ecx
            //   8b4604               | mov                 eax, dword ptr [esi + 4]

        $sequence_5 = { 39fe 73ea 8b4310 8945ec 50 e8???????? }
            // n = 6, score = 1100
            //   39fe                 | cmp                 esi, edi
            //   73ea                 | jae                 0xffffffec
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 8b0e 6a00 ff750c ff7508 }
            // n = 4, score = 1100
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   6a00                 | push                0
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_7 = { 50 e8???????? 83c404 29f7 01f3 8b75ec 56 }
            // n = 7, score = 1100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   29f7                 | sub                 edi, esi
            //   01f3                 | add                 ebx, esi
            //   8b75ec               | mov                 esi, dword ptr [ebp - 0x14]
            //   56                   | push                esi

        $sequence_8 = { eb10 6800800000 6a00 56 }
            // n = 4, score = 1000
            //   eb10                 | jmp                 0x12
            //   6800800000           | push                0x8000
            //   6a00                 | push                0
            //   56                   | push                esi

        $sequence_9 = { ff15???????? 807e5000 7509 ff764c }
            // n = 4, score = 1000
            //   ff15????????         |                     
            //   807e5000             | cmp                 byte ptr [esi + 0x50], 0
            //   7509                 | jne                 0xb
            //   ff764c               | push                dword ptr [esi + 0x4c]

        $sequence_10 = { 85ff 740f 57 ff7508 }
            // n = 4, score = 1000
            //   85ff                 | test                edi, edi
            //   740f                 | je                  0x11
            //   57                   | push                edi
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_11 = { ff15???????? 8d4634 50 ff15???????? 8d4e0c }
            // n = 5, score = 1000
            //   ff15????????         |                     
            //   8d4634               | lea                 eax, [esi + 0x34]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d4e0c               | lea                 ecx, [esi + 0xc]

        $sequence_12 = { 807e5800 7509 ff7654 ff15???????? 807e5000 }
            // n = 5, score = 1000
            //   807e5800             | cmp                 byte ptr [esi + 0x58], 0
            //   7509                 | jne                 0xb
            //   ff7654               | push                dword ptr [esi + 0x54]
            //   ff15????????         |                     
            //   807e5000             | cmp                 byte ptr [esi + 0x50], 0

        $sequence_13 = { 85c0 7515 8b4624 3b4620 }
            // n = 4, score = 1000
            //   85c0                 | test                eax, eax
            //   7515                 | jne                 0x17
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   3b4620               | cmp                 eax, dword ptr [esi + 0x20]

        $sequence_14 = { ff7010 ff7014 e8???????? 8b45e0 }
            // n = 4, score = 1000
            //   ff7010               | push                dword ptr [eax + 0x10]
            //   ff7014               | push                dword ptr [eax + 0x14]
            //   e8????????           |                     
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]

        $sequence_15 = { ff742428 e8???????? 8b442424 8d4c2410 }
            // n = 4, score = 1000
            //   ff742428             | push                dword ptr [esp + 0x28]
            //   e8????????           |                     
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   8d4c2410             | lea                 ecx, [esp + 0x10]

    condition:
        7 of them and filesize < 1302528
}
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