SYMBOLCOMMON_NAMEaka. SYNONYMS
win.bunitu (Back to overview)

Bunitu


Bunitu is a trojan that exposes infected computers to be used as a proxy for remote clients. It registers itself at startup by providing its address and open ports. Access to Bunitu proxies is available by using criminal VPN services (e.g.VIP72).

References
2021-04-12PTSecurityPTSecurity
@online{ptsecurity:20210412:paas:1d06836, author = {PTSecurity}, title = {{PaaS, or how hackers evade antivirus software}}, date = {2021-04-12}, organization = {PTSecurity}, url = {https://www.ptsecurity.com/ww-en/analytics/pt-esc-threat-intelligence/paas-or-how-hackers-evade-antivirus-software/}, language = {English}, urldate = {2021-04-12} } PaaS, or how hackers evade antivirus software
Amadey Bunitu Cerber Dridex ISFB KPOT Stealer Mailto Nemty Phobos Pony Predator The Thief QakBot Raccoon RTM SmokeLoader Zloader
2019-04-12BroadAnalysisAnalysis
@online{analysis:20190412:rig:0230572, author = {Analysis}, title = {{Rig Exploit Kit delivers Bunitu Malware}}, date = {2019-04-12}, organization = {BroadAnalysis}, url = {https://broadanalysis.com/2019/04/12/rig-exploit-kit-delivers-bunitu-malware/}, language = {English}, urldate = {2020-01-10} } Rig Exploit Kit delivers Bunitu Malware
Bunitu
2018-03-21Malware Breakdown BlogMalware Breakdown
@online{breakdown:20180321:fobos:15877e7, author = {Malware Breakdown}, title = {{Fobos Malvertising Campaign Delivers Bunitu Proxy Trojan via RIG EK}}, date = {2018-03-21}, organization = {Malware Breakdown Blog}, url = {https://malwarebreakdown.com/2018/03/21/fobos-malvertising-campaign-delivers-bunitu-proxy-trojan-via-rig-ek/}, language = {English}, urldate = {2019-10-13} } Fobos Malvertising Campaign Delivers Bunitu Proxy Trojan via RIG EK
Bunitu
2017-06-07Zerophage
@online{zerophage:20170607:rig:7e32e84, author = {Zerophage}, title = {{Rig EK via Fake EVE Online website drops Bunitu}}, date = {2017-06-07}, url = {https://zerophagemalware.com/2017/06/07/rig-ek-via-fake-eve-online-website-drops-bunitu/}, language = {English}, urldate = {2019-11-29} } Rig EK via Fake EVE Online website drops Bunitu
Bunitu
2017-05-09Malware Traffic AnalysisBrad Duncan
@online{duncan:20170509:rig:c6b2df9, author = {Brad Duncan}, title = {{RIG EK SENDS BUNITU TROJAN}}, date = {2017-05-09}, organization = {Malware Traffic Analysis}, url = {http://malware-traffic-analysis.net/2017/05/09/index.html}, language = {English}, urldate = {2020-01-08} } RIG EK SENDS BUNITU TROJAN
Bunitu
2015-08-05MalwarebytesMalwarebytes Labs
@online{labs:20150805:whos:972f567, author = {Malwarebytes Labs}, title = {{Who’s Behind Your Proxy? Uncovering Bunitu’s Secrets}}, date = {2015-08-05}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2015/08/whos-behind-your-proxy-uncovering-bunitus-secrets/}, language = {English}, urldate = {2019-12-20} } Who’s Behind Your Proxy? Uncovering Bunitu’s Secrets
Bunitu
2015-07-13Malwarebyteshasherezade
@online{hasherezade:20150713:revisiting:391fe73, author = {hasherezade}, title = {{Revisiting The Bunitu Trojan}}, date = {2015-07-13}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2015/07/revisiting-the-bunitu-trojan/}, language = {English}, urldate = {2019-12-20} } Revisiting The Bunitu Trojan
Bunitu
Yara Rules
[TLP:WHITE] win_bunitu_auto (20220411 | Detects win.bunitu.)
rule win_bunitu_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.bunitu."
        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.bunitu"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 95 48 83c410 2be8 8bcb 83c107 }
            // n = 6, score = 1300
            //   95                   | xchg                eax, ebp
            //   48                   | dec                 eax
            //   83c410               | add                 esp, 0x10
            //   2be8                 | sub                 ebp, eax
            //   8bcb                 | mov                 ecx, ebx
            //   83c107               | add                 ecx, 7

        $sequence_1 = { 52 6800000100 50 51 6800080000 6a00 ff15???????? }
            // n = 7, score = 1300
            //   52                   | push                edx
            //   6800000100           | push                0x10000
            //   50                   | push                eax
            //   51                   | push                ecx
            //   6800080000           | push                0x800
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_2 = { eb05 e8???????? 6864190000 6a08 }
            // n = 4, score = 1300
            //   eb05                 | jmp                 7
            //   e8????????           |                     
            //   6864190000           | push                0x1964
            //   6a08                 | push                8

        $sequence_3 = { ff0424 50 50 ff15???????? 33c0 }
            // n = 5, score = 1300
            //   ff0424               | inc                 dword ptr [esp]
            //   50                   | push                eax
            //   50                   | push                eax
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 68e8030000 ff15???????? 33c0 68???????? 50 6a00 68???????? }
            // n = 7, score = 1300
            //   68e8030000           | push                0x3e8
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   68????????           |                     
            //   50                   | push                eax
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_5 = { 2bfa 87fa 5f 8bc2 48 40 8d443825 }
            // n = 7, score = 1300
            //   2bfa                 | sub                 edi, edx
            //   87fa                 | xchg                edx, edi
            //   5f                   | pop                 edi
            //   8bc2                 | mov                 eax, edx
            //   48                   | dec                 eax
            //   40                   | inc                 eax
            //   8d443825             | lea                 eax, dword ptr [eax + edi + 0x25]

        $sequence_6 = { 59 8bd0 8bdf b82f000000 }
            // n = 4, score = 1300
            //   59                   | pop                 ecx
            //   8bd0                 | mov                 edx, eax
            //   8bdf                 | mov                 ebx, edi
            //   b82f000000           | mov                 eax, 0x2f

        $sequence_7 = { 8bc2 48 40 8d443825 668b00 }
            // n = 5, score = 1300
            //   8bc2                 | mov                 eax, edx
            //   48                   | dec                 eax
            //   40                   | inc                 eax
            //   8d443825             | lea                 eax, dword ptr [eax + edi + 0x25]
            //   668b00               | mov                 ax, word ptr [eax]

        $sequence_8 = { 56 57 52 8b7d08 8b750c 8b4d10 49 }
            // n = 7, score = 1300
            //   56                   | push                esi
            //   57                   | push                edi
            //   52                   | push                edx
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   49                   | dec                 ecx

        $sequence_9 = { 68???????? ffb524fdffff e8???????? eb12 6a08 68???????? ffb524fdffff }
            // n = 7, score = 1300
            //   68????????           |                     
            //   ffb524fdffff         | push                dword ptr [ebp - 0x2dc]
            //   e8????????           |                     
            //   eb12                 | jmp                 0x14
            //   6a08                 | push                8
            //   68????????           |                     
            //   ffb524fdffff         | push                dword ptr [ebp - 0x2dc]

    condition:
        7 of them and filesize < 221184
}
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