SYMBOLCOMMON_NAMEaka. SYNONYMS
win.nitlove (Back to overview)

nitlove


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References
2015-05-23FireEyeNart Villeneuve, Daniel Regalado
@online{villeneuve:20150523:nitlovepos:f990fd4, author = {Nart Villeneuve and Daniel Regalado}, title = {{NitlovePOS: Another New POS Malware}}, date = {2015-05-23}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2015/05/nitlovepos_another.html}, language = {English}, urldate = {2019-12-20} } NitlovePOS: Another New POS Malware
nitlove
Yara Rules
[TLP:WHITE] win_nitlove_auto (20220411 | Detects win.nitlove.)
rule win_nitlove_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.nitlove."
        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.nitlove"
        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 = { 56 8d45f8 be???????? 50 53 53 }
            // n = 6, score = 200
            //   56                   | push                esi
            //   8d45f8               | lea                 eax, dword ptr [ebp - 8]
            //   be????????           |                     
            //   50                   | push                eax
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_1 = { 6a1c 8d4db4 ba9749e08e 51 50 }
            // n = 5, score = 200
            //   6a1c                 | push                0x1c
            //   8d4db4               | lea                 ecx, dword ptr [ebp - 0x4c]
            //   ba9749e08e           | mov                 edx, 0x8ee04997
            //   51                   | push                ecx
            //   50                   | push                eax

        $sequence_2 = { 663919 740d 8d54242e 8d4902 42 663919 }
            // n = 6, score = 200
            //   663919               | cmp                 word ptr [ecx], bx
            //   740d                 | je                  0xf
            //   8d54242e             | lea                 edx, dword ptr [esp + 0x2e]
            //   8d4902               | lea                 ecx, dword ptr [ecx + 2]
            //   42                   | inc                 edx
            //   663919               | cmp                 word ptr [ecx], bx

        $sequence_3 = { ba784c98aa e8???????? ffd0 8b542418 8bcb e8???????? }
            // n = 6, score = 200
            //   ba784c98aa           | mov                 edx, 0xaa984c78
            //   e8????????           |                     
            //   ffd0                 | call                eax
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     

        $sequence_4 = { 8bf8 2bfe f7df 1bff }
            // n = 4, score = 200
            //   8bf8                 | mov                 edi, eax
            //   2bfe                 | sub                 edi, esi
            //   f7df                 | neg                 edi
            //   1bff                 | sbb                 edi, edi

        $sequence_5 = { 8bcb e8???????? ffd0 8bf0 ba7e003a43 57 }
            // n = 6, score = 200
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   ffd0                 | call                eax
            //   8bf0                 | mov                 esi, eax
            //   ba7e003a43           | mov                 edx, 0x433a007e
            //   57                   | push                edi

        $sequence_6 = { 59 66898c450cfeffff 33c9 668994450efeffff baeb9b12fe }
            // n = 5, score = 200
            //   59                   | pop                 ecx
            //   66898c450cfeffff     | mov                 word ptr [ebp + eax*2 - 0x1f4], cx
            //   33c9                 | xor                 ecx, ecx
            //   668994450efeffff     | mov                 word ptr [ebp + eax*2 - 0x1f2], dx
            //   baeb9b12fe           | mov                 edx, 0xfe129beb

        $sequence_7 = { 83c40c 84c0 7516 56 8d45f8 b901000080 56 }
            // n = 7, score = 200
            //   83c40c               | add                 esp, 0xc
            //   84c0                 | test                al, al
            //   7516                 | jne                 0x18
            //   56                   | push                esi
            //   8d45f8               | lea                 eax, dword ptr [ebp - 8]
            //   b901000080           | mov                 ecx, 0x80000001
            //   56                   | push                esi

        $sequence_8 = { 8b4580 8945e4 8b4584 8945e0 8b4598 }
            // n = 5, score = 200
            //   8b4580               | mov                 eax, dword ptr [ebp - 0x80]
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   8b4584               | mov                 eax, dword ptr [ebp - 0x7c]
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8b4598               | mov                 eax, dword ptr [ebp - 0x68]

        $sequence_9 = { 5a 8818 40 4a 75fa 6a10 59 }
            // n = 7, score = 200
            //   5a                   | pop                 edx
            //   8818                 | mov                 byte ptr [eax], bl
            //   40                   | inc                 eax
            //   4a                   | dec                 edx
            //   75fa                 | jne                 0xfffffffc
            //   6a10                 | push                0x10
            //   59                   | pop                 ecx

    condition:
        7 of them and filesize < 49152
}
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