SYMBOLCOMMON_NAMEaka. SYNONYMS
win.wpbrutebot (Back to overview)

WpBruteBot


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References
2020-09-16ZscalerAvinash Kumar, Aditya Sharma
@online{kumar:20200916:malware:60f39c3, author = {Avinash Kumar and Aditya Sharma}, title = {{Malware Leveraging XML-RPC Vulnerability to Exploit WordPress Sites}}, date = {2020-09-16}, organization = {Zscaler}, url = {https://www.zscaler.com/blogs/security-research/malware-leveraging-xml-rpc-vulnerability-exploit-wordpress-sites}, language = {English}, urldate = {2020-09-23} } Malware Leveraging XML-RPC Vulnerability to Exploit WordPress Sites
WpBruteBot
Yara Rules
[TLP:WHITE] win_wpbrutebot_auto (20220516 | Detects win.wpbrutebot.)
rule win_wpbrutebot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.wpbrutebot."
        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.wpbrutebot"
        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 = { 8b8c2480000000 2bc1 83f801 7407 33ff e9???????? 803900 }
            // n = 7, score = 100
            //   8b8c2480000000       | mov                 ecx, dword ptr [esp + 0x80]
            //   2bc1                 | sub                 eax, ecx
            //   83f801               | cmp                 eax, 1
            //   7407                 | je                  9
            //   33ff                 | xor                 edi, edi
            //   e9????????           |                     
            //   803900               | cmp                 byte ptr [ecx], 0

        $sequence_1 = { 8b9028010000 894dfc 8b8840010000 8b8044010000 8945ec 33c0 8955f0 }
            // n = 7, score = 100
            //   8b9028010000         | mov                 edx, dword ptr [eax + 0x128]
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   8b8840010000         | mov                 ecx, dword ptr [eax + 0x140]
            //   8b8044010000         | mov                 eax, dword ptr [eax + 0x144]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   33c0                 | xor                 eax, eax
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx

        $sequence_2 = { 8b6e28 89442420 8b442428 89542410 3b4638 7611 682b010000 }
            // n = 7, score = 100
            //   8b6e28               | mov                 ebp, dword ptr [esi + 0x28]
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   89542410             | mov                 dword ptr [esp + 0x10], edx
            //   3b4638               | cmp                 eax, dword ptr [esi + 0x38]
            //   7611                 | jbe                 0x13
            //   682b010000           | push                0x12b

        $sequence_3 = { e8???????? 83c40c 80bf9c08000000 742b 56 68???????? e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   80bf9c08000000       | cmp                 byte ptr [edi + 0x89c], 0
            //   742b                 | je                  0x2d
            //   56                   | push                esi
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_4 = { c3 83c61a 55 68???????? 8d041e 50 e8???????? }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   83c61a               | add                 esi, 0x1a
            //   55                   | push                ebp
            //   68????????           |                     
            //   8d041e               | lea                 eax, [esi + ebx]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_5 = { 53 2bf1 c785d07bffff00000000 e8???????? 83c408 85c0 741a }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   2bf1                 | sub                 esi, ecx
            //   c785d07bffff00000000     | mov    dword ptr [ebp - 0x8430], 0
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   741a                 | je                  0x1c

        $sequence_6 = { e8???????? 83c0eb 83c404 83f803 776b ff248598b54e00 8b5614 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c0eb               | add                 eax, -0x15
            //   83c404               | add                 esp, 4
            //   83f803               | cmp                 eax, 3
            //   776b                 | ja                  0x6d
            //   ff248598b54e00       | jmp                 dword ptr [eax*4 + 0x4eb598]
            //   8b5614               | mov                 edx, dword ptr [esi + 0x14]

        $sequence_7 = { c3 33c9 33d2 85db 7e71 8b7c2428 55 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   33c9                 | xor                 ecx, ecx
            //   33d2                 | xor                 edx, edx
            //   85db                 | test                ebx, ebx
            //   7e71                 | jle                 0x73
            //   8b7c2428             | mov                 edi, dword ptr [esp + 0x28]
            //   55                   | push                ebp

        $sequence_8 = { 83bec007000000 7524 83fd0a 7e5b 8d45f6 898660020000 8d430a }
            // n = 7, score = 100
            //   83bec007000000       | cmp                 dword ptr [esi + 0x7c0], 0
            //   7524                 | jne                 0x26
            //   83fd0a               | cmp                 ebp, 0xa
            //   7e5b                 | jle                 0x5d
            //   8d45f6               | lea                 eax, [ebp - 0xa]
            //   898660020000         | mov                 dword ptr [esi + 0x260], eax
            //   8d430a               | lea                 eax, [ebx + 0xa]

        $sequence_9 = { ffb60c030000 c7861403000000000000 ff15???????? ffb610030000 c7860c03000000000000 ff15???????? ffb644030000 }
            // n = 7, score = 100
            //   ffb60c030000         | push                dword ptr [esi + 0x30c]
            //   c7861403000000000000     | mov    dword ptr [esi + 0x314], 0
            //   ff15????????         |                     
            //   ffb610030000         | push                dword ptr [esi + 0x310]
            //   c7860c03000000000000     | mov    dword ptr [esi + 0x30c], 0
            //   ff15????????         |                     
            //   ffb644030000         | push                dword ptr [esi + 0x344]

    condition:
        7 of them and filesize < 5134336
}
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