SYMBOLCOMMON_NAMEaka. SYNONYMS
win.lock_pos (Back to overview)

LockPOS


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References
2018-01-16CylanceCylance Threat Research Team
@online{team:20180116:threat:9f912f5, author = {Cylance Threat Research Team}, title = {{Threat Spotlight: LockPOS Point of Sale Malware}}, date = {2018-01-16}, organization = {Cylance}, url = {https://www.cylance.com/en_us/blog/threat-spotlight-lockpos-point-of-sale-malware.html}, language = {English}, urldate = {2019-11-25} } Threat Spotlight: LockPOS Point of Sale Malware
LockPOS
2018-01-03CyberbitHod Gavriel
@online{gavriel:20180103:new:34da39b, author = {Hod Gavriel}, title = {{New LockPoS Malware Injection Technique}}, date = {2018-01-03}, organization = {Cyberbit}, url = {https://www.cyberbit.com/new-lockpos-malware-injection-technique/}, language = {English}, urldate = {2019-11-28} } New LockPoS Malware Injection Technique
LockPOS
2017-07-12NetScoutDennis Schwarz
@online{schwarz:20170712:lockpos:c5394b5, author = {Dennis Schwarz}, title = {{LockPoS Joins the Flock}}, date = {2017-07-12}, organization = {NetScout}, url = {https://www.arbornetworks.com/blog/asert/lockpos-joins-flock/}, language = {English}, urldate = {2020-01-06} } LockPoS Joins the Flock
LockPOS
Yara Rules
[TLP:WHITE] win_lock_pos_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_lock_pos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.lock_pos"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { 55 8bec 837d0800 7704 33c0 }
            // n = 5, score = 400
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   7704                 | ja                  6
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 55 8bec 8b4508 8b0d???????? 8b0481 }
            // n = 5, score = 400
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b0d????????         |                     
            //   8b0481               | mov                 eax, dword ptr [ecx + eax*4]

        $sequence_2 = { 55 8bec 81eca4040000 56 }
            // n = 4, score = 300
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81eca4040000         | sub                 esp, 0x4a4
            //   56                   | push                esi

        $sequence_3 = { 6a23 6a00 ff15???????? 8d8df8fdffff }
            // n = 4, score = 300
            //   6a23                 | push                0x23
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8d8df8fdffff         | lea                 ecx, [ebp - 0x208]

        $sequence_4 = { 8d85f8fdffff 50 6a00 6a00 6a23 6a00 }
            // n = 6, score = 300
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a23                 | push                0x23
            //   6a00                 | push                0

        $sequence_5 = { 8d45f8 99 8945c0 8955c4 }
            // n = 4, score = 200
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   99                   | cdq                 
            //   8945c0               | mov                 dword ptr [ebp - 0x40], eax
            //   8955c4               | mov                 dword ptr [ebp - 0x3c], edx

        $sequence_6 = { 8b4dec 8b5508 0311 8955e0 }
            // n = 4, score = 200
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0311                 | add                 edx, dword ptr [ecx]
            //   8955e0               | mov                 dword ptr [ebp - 0x20], edx

        $sequence_7 = { 0355f8 8b45fc 0345f4 8a08 880a 8b55f8 83c201 }
            // n = 7, score = 200
            //   0355f8               | add                 edx, dword ptr [ebp - 8]
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   0345f4               | add                 eax, dword ptr [ebp - 0xc]
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   880a                 | mov                 byte ptr [edx], cl
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   83c201               | add                 edx, 1

        $sequence_8 = { 770a 47 83c102 3bd1 77ec }
            // n = 5, score = 200
            //   770a                 | ja                  0xc
            //   47                   | inc                 edi
            //   83c102               | add                 ecx, 2
            //   3bd1                 | cmp                 edx, ecx
            //   77ec                 | ja                  0xffffffee

        $sequence_9 = { bf???????? 57 ff15???????? 833d????????01 57 0f9445ff ff15???????? }
            // n = 7, score = 200
            //   bf????????           |                     
            //   57                   | push                edi
            //   ff15????????         |                     
            //   833d????????01       |                     
            //   57                   | push                edi
            //   0f9445ff             | sete                byte ptr [ebp - 1]
            //   ff15????????         |                     

        $sequence_10 = { 89742414 89742428 8974242c 89542434 }
            // n = 4, score = 200
            //   89742414             | mov                 dword ptr [esp + 0x14], esi
            //   89742428             | mov                 dword ptr [esp + 0x28], esi
            //   8974242c             | mov                 dword ptr [esp + 0x2c], esi
            //   89542434             | mov                 dword ptr [esp + 0x34], edx

        $sequence_11 = { 8b45fc 8b08 894dfc 8b55fc 8b45f8 3b02 0f8560ffffff }
            // n = 7, score = 200
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   3b02                 | cmp                 eax, dword ptr [edx]
            //   0f8560ffffff         | jne                 0xffffff66

        $sequence_12 = { 6683e00f 0fb7c8 83f902 7538 baff0f0000 8b45f4 662310 }
            // n = 7, score = 200
            //   6683e00f             | and                 ax, 0xf
            //   0fb7c8               | movzx               ecx, ax
            //   83f902               | cmp                 ecx, 2
            //   7538                 | jne                 0x3a
            //   baff0f0000           | mov                 edx, 0xfff
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   662310               | and                 dx, word ptr [eax]

    condition:
        7 of them and filesize < 319488
}
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