SYMBOLCOMMON_NAMEaka. SYNONYMS
win.xbot_pos (Back to overview)

XBot POS


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References
2017-08-16Benkow LabBenoît Ancel
@online{ancel:20170816:quick:e3a37c1, author = {Benoît Ancel}, title = {{Quick look at another Alina fork: XBOT-POS}}, date = {2017-08-16}, organization = {Benkow Lab}, url = {https://benkowlab.blogspot.de/2017/08/quick-look-at-another-alina-fork-xbot.html}, language = {English}, urldate = {2020-01-10} } Quick look at another Alina fork: XBOT-POS
XBot POS
Yara Rules
[TLP:WHITE] win_xbot_pos_auto (20220411 | Detects win.xbot_pos.)
rule win_xbot_pos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.xbot_pos."
        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.xbot_pos"
        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 = { 52 8d85e4f1ffff 50 e8???????? 83c40c 898500f1ffff 8b8d00f1ffff }
            // n = 7, score = 100
            //   52                   | push                edx
            //   8d85e4f1ffff         | lea                 eax, dword ptr [ebp - 0xe1c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   898500f1ffff         | mov                 dword ptr [ebp - 0xf00], eax
            //   8b8d00f1ffff         | mov                 ecx, dword ptr [ebp - 0xf00]

        $sequence_1 = { 837d1000 740b 8b5510 8995e0ddffff eb0a c785e0ddffffa0925400 837d1000 }
            // n = 7, score = 100
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   740b                 | je                  0xd
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   8995e0ddffff         | mov                 dword ptr [ebp - 0x2220], edx
            //   eb0a                 | jmp                 0xc
            //   c785e0ddffffa0925400     | mov    dword ptr [ebp - 0x2220], 0x5492a0
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0

        $sequence_2 = { 8d8decfeffff e8???????? 8d8da8fcffff e8???????? 8d8588fcffff 50 8b4de8 }
            // n = 7, score = 100
            //   8d8decfeffff         | lea                 ecx, dword ptr [ebp - 0x114]
            //   e8????????           |                     
            //   8d8da8fcffff         | lea                 ecx, dword ptr [ebp - 0x358]
            //   e8????????           |                     
            //   8d8588fcffff         | lea                 eax, dword ptr [ebp - 0x378]
            //   50                   | push                eax
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]

        $sequence_3 = { e9???????? 8b4d0c 83e90b 51 8b5508 83ea0b }
            // n = 6, score = 100
            //   e9????????           |                     
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   83e90b               | sub                 ecx, 0xb
            //   51                   | push                ecx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   83ea0b               | sub                 edx, 0xb

        $sequence_4 = { 898550feffff 8b8d50feffff 0fbe11 85d2 0f8541010000 8b45dc 8945d0 }
            // n = 7, score = 100
            //   898550feffff         | mov                 dword ptr [ebp - 0x1b0], eax
            //   8b8d50feffff         | mov                 ecx, dword ptr [ebp - 0x1b0]
            //   0fbe11               | movsx               edx, byte ptr [ecx]
            //   85d2                 | test                edx, edx
            //   0f8541010000         | jne                 0x147
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax

        $sequence_5 = { 006f49 4c 007c494c 0089494c0096 49 }
            // n = 5, score = 100
            //   006f49               | add                 byte ptr [edi + 0x49], ch
            //   4c                   | dec                 esp
            //   007c494c             | add                 byte ptr [ecx + ecx*2 + 0x4c], bh
            //   0089494c0096         | add                 byte ptr [ecx - 0x69ffb3b7], cl
            //   49                   | dec                 ecx

        $sequence_6 = { 7535 8b4df8 e8???????? 8b4d0c 3b08 730b 8b550c }
            // n = 7, score = 100
            //   7535                 | jne                 0x37
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   3b08                 | cmp                 ecx, dword ptr [eax]
            //   730b                 | jae                 0xd
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]

        $sequence_7 = { 85c9 7408 8b55f0 8955e0 eb07 c745e0c8415600 }
            // n = 6, score = 100
            //   85c9                 | test                ecx, ecx
            //   7408                 | je                  0xa
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   8955e0               | mov                 dword ptr [ebp - 0x20], edx
            //   eb07                 | jmp                 9
            //   c745e0c8415600       | mov                 dword ptr [ebp - 0x20], 0x5641c8

        $sequence_8 = { 03c8 898d2cfeffff 8b8d58fcffff 0fb711 8d049560885500 898544fcffff 8b8d58fcffff }
            // n = 7, score = 100
            //   03c8                 | add                 ecx, eax
            //   898d2cfeffff         | mov                 dword ptr [ebp - 0x1d4], ecx
            //   8b8d58fcffff         | mov                 ecx, dword ptr [ebp - 0x3a8]
            //   0fb711               | movzx               edx, word ptr [ecx]
            //   8d049560885500       | lea                 eax, dword ptr [edx*4 + 0x558860]
            //   898544fcffff         | mov                 dword ptr [ebp - 0x3bc], eax
            //   8b8d58fcffff         | mov                 ecx, dword ptr [ebp - 0x3a8]

        $sequence_9 = { 8bcd 50 8d1560844800 e8???????? 58 5a 5f }
            // n = 7, score = 100
            //   8bcd                 | mov                 ecx, ebp
            //   50                   | push                eax
            //   8d1560844800         | lea                 edx, dword ptr [0x488460]
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   5a                   | pop                 edx
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 3031040
}
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