SYMBOLCOMMON_NAMEaka. SYNONYMS
win.client_maximus (Back to overview)

Client Maximus


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References
2017-01-10SecurityIntelligenceLior Keshet, Limor Kessem
@online{keshet:20170110:client:5352952, author = {Lior Keshet and Limor Kessem}, title = {{Client Maximus: New Remote Overlay Malware Highlights Rising Malcode Sophistication in Brazil}}, date = {2017-01-10}, organization = {SecurityIntelligence}, url = {https://securityintelligence.com/client-maximus-new-remote-overlay-malware-highlights-rising-malcode-sophistication-in-brazil/}, language = {English}, urldate = {2020-01-07} } Client Maximus: New Remote Overlay Malware Highlights Rising Malcode Sophistication in Brazil
Client Maximus
Yara Rules
[TLP:WHITE] win_client_maximus_auto (20220516 | Detects win.client_maximus.)
rule win_client_maximus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.client_maximus."
        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.client_maximus"
        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 = { 85c0 7535 c70424???????? ff15???????? 83ec04 85c0 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7535                 | jne                 0x37
            //   c70424????????       |                     
            //   ff15????????         |                     
            //   83ec04               | sub                 esp, 4
            //   85c0                 | test                eax, eax

        $sequence_1 = { e9???????? c704247e000000 ff15???????? 83ec04 e9???????? }
            // n = 5, score = 300
            //   e9????????           |                     
            //   c704247e000000       | mov                 dword ptr [esp], 0x7e
            //   ff15????????         |                     
            //   83ec04               | sub                 esp, 4
            //   e9????????           |                     

        $sequence_2 = { 5e 5f 5d c3 8b4210 85c0 }
            // n = 6, score = 300
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4210               | mov                 eax, dword ptr [edx + 0x10]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 8b5330 c744240800800000 c744240400000000 890424 8954240c ff5320 ff15???????? }
            // n = 7, score = 300
            //   8b5330               | mov                 edx, dword ptr [ebx + 0x30]
            //   c744240800800000     | mov                 dword ptr [esp + 8], 0x8000
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   890424               | mov                 dword ptr [esp], eax
            //   8954240c             | mov                 dword ptr [esp + 0xc], edx
            //   ff5320               | call                dword ptr [ebx + 0x20]
            //   ff15????????         |                     

        $sequence_4 = { c744240800800000 c744240400000000 890424 8954240c }
            // n = 4, score = 300
            //   c744240800800000     | mov                 dword ptr [esp + 8], 0x8000
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   890424               | mov                 dword ptr [esp], eax
            //   8954240c             | mov                 dword ptr [esp + 0xc], edx

        $sequence_5 = { 8b542408 8b442404 85d2 8b4004 7403 0302 }
            // n = 6, score = 300
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   85d2                 | test                edx, edx
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   7403                 | je                  5
            //   0302                 | add                 eax, dword ptr [edx]

        $sequence_6 = { 837c242401 7515 8b442420 c70424???????? a3???????? e8???????? b801000000 }
            // n = 7, score = 300
            //   837c242401           | cmp                 dword ptr [esp + 0x24], 1
            //   7515                 | jne                 0x17
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   c70424????????       |                     
            //   a3????????           |                     
            //   e8????????           |                     
            //   b801000000           | mov                 eax, 1

        $sequence_7 = { 85c0 7418 8b5014 85d2 7511 8b5034 85d2 }
            // n = 7, score = 300
            //   85c0                 | test                eax, eax
            //   7418                 | je                  0x1a
            //   8b5014               | mov                 edx, dword ptr [eax + 0x14]
            //   85d2                 | test                edx, edx
            //   7511                 | jne                 0x13
            //   8b5034               | mov                 edx, dword ptr [eax + 0x34]
            //   85d2                 | test                edx, edx

        $sequence_8 = { e8???????? 8b4304 85c0 741d 8b5330 c744240800800000 c744240400000000 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   85c0                 | test                eax, eax
            //   741d                 | je                  0x1f
            //   8b5330               | mov                 edx, dword ptr [ebx + 0x30]
            //   c744240800800000     | mov                 dword ptr [esp + 8], 0x8000
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0

        $sequence_9 = { 8b5330 890424 89542404 ff532c }
            // n = 4, score = 300
            //   8b5330               | mov                 edx, dword ptr [ebx + 0x30]
            //   890424               | mov                 dword ptr [esp], eax
            //   89542404             | mov                 dword ptr [esp + 4], edx
            //   ff532c               | call                dword ptr [ebx + 0x2c]

    condition:
        7 of them and filesize < 106496
}
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