SYMBOLCOMMON_NAMEaka. SYNONYMS
win.onliner (Back to overview)

OnlinerSpambot

aka: SBot, Onliner

A spambot that has been observed being used for spreading Ursnif, Zeus Panda, Andromeda or Netflix phishing against Italy and Canada.

References
2019-07-29BluelivAlberto Marín
@online{marn:20190729:analysis:c32955f, author = {Alberto Marín}, title = {{An analysis of a spam distribution botnet: the inner workings of Onliner Spambot}}, date = {2019-07-29}, organization = {Blueliv}, url = {https://www.blueliv.com/blog/research/analysis-spam-distribution-botnet-onliner-spambot/}, language = {English}, urldate = {2019-12-17} } An analysis of a spam distribution botnet: the inner workings of Onliner Spambot
OnlinerSpambot
2017-08-29Benkow LabBenoît Ancel
@online{ancel:20170829:from:7ef6dac, author = {Benoît Ancel}, title = {{From Onliner Spambot to millions of email's lists and credentials}}, date = {2017-08-29}, organization = {Benkow Lab}, url = {https://benkowlab.blogspot.com/2017/08/from-onliner-spambot-to-millions-of.html}, language = {English}, urldate = {2020-01-06} } From Onliner Spambot to millions of email's lists and credentials
OnlinerSpambot
2017-02-27Benkow LabBenoît Ancel
@online{ancel:20170227:spambot:b40e584, author = {Benoît Ancel}, title = {{Spambot safari #2 - Online Mail System}}, date = {2017-02-27}, organization = {Benkow Lab}, url = {https://benkowlab.blogspot.fr/2017/02/spambot-safari-2-online-mail-system.html}, language = {English}, urldate = {2020-01-09} } Spambot safari #2 - Online Mail System
OnlinerSpambot
Yara Rules
[TLP:WHITE] win_onliner_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_onliner_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.onliner"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { a1???????? e8???????? 8945f0 8b5330 8b45f0 8b08 }
            // n = 6, score = 200
            //   a1????????           |                     
            //   e8????????           |                     
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8b5330               | mov                 edx, dword ptr [ebx + 0x30]
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b08                 | mov                 ecx, dword ptr [eax]

        $sequence_1 = { 85c0 0f84b9000000 8d442408 50 68???????? }
            // n = 5, score = 200
            //   85c0                 | test                eax, eax
            //   0f84b9000000         | je                  0xbf
            //   8d442408             | lea                 eax, [esp + 8]
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_2 = { 55 8d45a0 e8???????? ba01000000 4a 85c0 }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   8d45a0               | lea                 eax, [ebp - 0x60]
            //   e8????????           |                     
            //   ba01000000           | mov                 edx, 1
            //   4a                   | dec                 edx
            //   85c0                 | test                eax, eax

        $sequence_3 = { 8b14955c834200 e8???????? e9???????? 6681fb0001 7511 8bc6 }
            // n = 6, score = 200
            //   8b14955c834200       | mov                 edx, dword ptr [edx*4 + 0x42835c]
            //   e8????????           |                     
            //   e9????????           |                     
            //   6681fb0001           | cmp                 bx, 0x100
            //   7511                 | jne                 0x13
            //   8bc6                 | mov                 eax, esi

        $sequence_4 = { 89e2 89f8 e8???????? 81c404010000 5f c3 50 }
            // n = 7, score = 200
            //   89e2                 | mov                 edx, esp
            //   89f8                 | mov                 eax, edi
            //   e8????????           |                     
            //   81c404010000         | add                 esp, 0x104
            //   5f                   | pop                 edi
            //   c3                   | ret                 
            //   50                   | push                eax

        $sequence_5 = { 85c0 750e 8b0424 50 }
            // n = 4, score = 200
            //   85c0                 | test                eax, eax
            //   750e                 | jne                 0x10
            //   8b0424               | mov                 eax, dword ptr [esp]
            //   50                   | push                eax

        $sequence_6 = { 8945f0 33c0 8945ec 837df000 7426 83caff 8b45f8 }
            // n = 7, score = 200
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   33c0                 | xor                 eax, eax
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   837df000             | cmp                 dword ptr [ebp - 0x10], 0
            //   7426                 | je                  0x28
            //   83caff               | or                  edx, 0xffffffff
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_7 = { b8???????? e8???????? 48 50 8d8dacfeffff 8bd3 8bc6 }
            // n = 7, score = 200
            //   b8????????           |                     
            //   e8????????           |                     
            //   48                   | dec                 eax
            //   50                   | push                eax
            //   8d8dacfeffff         | lea                 ecx, [ebp - 0x154]
            //   8bd3                 | mov                 edx, ebx
            //   8bc6                 | mov                 eax, esi

        $sequence_8 = { 5b c3 53 e8???????? b001 }
            // n = 5, score = 200
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   53                   | push                ebx
            //   e8????????           |                     
            //   b001                 | mov                 al, 1

        $sequence_9 = { ff15???????? eb0f 68e8030000 e8???????? e9???????? 33c0 5a }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   eb0f                 | jmp                 0x11
            //   68e8030000           | push                0x3e8
            //   e8????????           |                     
            //   e9????????           |                     
            //   33c0                 | xor                 eax, eax
            //   5a                   | pop                 edx

    condition:
        7 of them and filesize < 42346496
}
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