SYMBOLCOMMON_NAMEaka. SYNONYMS
win.logpos (Back to overview)

LogPOS


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References
2015-11-16Nick Hoffman
@online{hoffman:20151116:introducing:eed78d1, author = {Nick Hoffman}, title = {{Introducing LogPOS}}, date = {2015-11-16}, url = {https://securitykitten.github.io/2015/11/16/logpos-new-point-of-sale-malware-using-mailslots.html}, language = {English}, urldate = {2020-01-07} } Introducing LogPOS
LogPOS
Yara Rules
[TLP:WHITE] win_logpos_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_logpos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.logpos"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 894364 8d87660a0000 894368 e8???????? 89436c e8???????? }
            // n = 6, score = 100
            //   894364               | mov                 dword ptr [ebx + 0x64], eax
            //   8d87660a0000         | lea                 eax, [edi + 0xa66]
            //   894368               | mov                 dword ptr [ebx + 0x68], eax
            //   e8????????           |                     
            //   89436c               | mov                 dword ptr [ebx + 0x6c], eax
            //   e8????????           |                     

        $sequence_1 = { ff4508 ff4d0c 837d0c00 0f8517f9ffff 89ec 5d }
            // n = 6, score = 100
            //   ff4508               | inc                 dword ptr [ebp + 8]
            //   ff4d0c               | dec                 dword ptr [ebp + 0xc]
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   0f8517f9ffff         | jne                 0xfffff91d
            //   89ec                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_2 = { 50 a1???????? 8d4004 50 ff15???????? }
            // n = 5, score = 100
            //   50                   | push                eax
            //   a1????????           |                     
            //   8d4004               | lea                 eax, [eax + 4]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_3 = { 6a0f ff15???????? 8d8550feffff 50 }
            // n = 4, score = 100
            //   6a0f                 | push                0xf
            //   ff15????????         |                     
            //   8d8550feffff         | lea                 eax, [ebp - 0x1b0]
            //   50                   | push                eax

        $sequence_4 = { b800000000 e9???????? b800000000 e9???????? 837dfc0f }
            // n = 5, score = 100
            //   b800000000           | mov                 eax, 0
            //   e9????????           |                     
            //   b800000000           | mov                 eax, 0
            //   e9????????           |                     
            //   837dfc0f             | cmp                 dword ptr [ebp - 4], 0xf

        $sequence_5 = { 45 84c0 75eb 4c 0fb602 41 80f86b }
            // n = 7, score = 100
            //   45                   | inc                 ebp
            //   84c0                 | test                al, al
            //   75eb                 | jne                 0xffffffed
            //   4c                   | dec                 esp
            //   0fb602               | movzx               eax, byte ptr [edx]
            //   41                   | inc                 ecx
            //   80f86b               | cmp                 al, 0x6b

        $sequence_6 = { 83f800 0f8434000000 e9???????? 0fb645fb }
            // n = 4, score = 100
            //   83f800               | cmp                 eax, 0
            //   0f8434000000         | je                  0x3a
            //   e9????????           |                     
            //   0fb645fb             | movzx               eax, byte ptr [ebp - 5]

        $sequence_7 = { 85c0 0f84b7000000 4c 8b55c8 48 83ec30 48 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   0f84b7000000         | je                  0xbd
            //   4c                   | dec                 esp
            //   8b55c8               | mov                 edx, dword ptr [ebp - 0x38]
            //   48                   | dec                 eax
            //   83ec30               | sub                 esp, 0x30
            //   48                   | dec                 eax

        $sequence_8 = { e8???????? 83c40c c745f001000000 e9???????? 837d0c00 0f8462000000 6a40 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1
            //   e9????????           |                     
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   0f8462000000         | je                  0x68
            //   6a40                 | push                0x40

        $sequence_9 = { 55 89e5 83ec10 c745fc00000000 a1???????? 8945f0 }
            // n = 6, score = 100
            //   55                   | push                ebp
            //   89e5                 | mov                 ebp, esp
            //   83ec10               | sub                 esp, 0x10
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   a1????????           |                     
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax

    condition:
        7 of them and filesize < 57344
}
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