SYMBOLCOMMON_NAMEaka. SYNONYMS
win.dexter (Back to overview)

Dexter

aka: LusyPOS

There is no description at this point.

References
2012-12-23Contagio DumpMila Parkour
@online{parkour:20121223:dec:04b8065, author = {Mila Parkour}, title = {{Dec 2012 Dexter - POS Infostealer samples and information}}, date = {2012-12-23}, organization = {Contagio Dump}, url = {http://contagiodump.blogspot.com/2012/12/dexter-pos-infostealer-samples-and.html}, language = {English}, urldate = {2019-12-20} } Dec 2012 Dexter - POS Infostealer samples and information
Dexter
2012-12-21Trend MicroJason Pantig
@online{pantig:20121221:infostealer:775f6fa, author = {Jason Pantig}, title = {{Infostealer Dexter Targets Checkout Systems}}, date = {2012-12-21}, organization = {Trend Micro}, url = {https://blog.trendmicro.com/trendlabs-security-intelligence/infostealer-dexter-targets-checkout-systems/}, language = {English}, urldate = {2020-01-08} } Infostealer Dexter Targets Checkout Systems
Dexter
2012-12-12Volatility LabsMichael Hale Ligh
@online{ligh:20121212:unpacking:612f008, author = {Michael Hale Ligh}, title = {{Unpacking Dexter POS "Memory Dump Parsing" Malware}}, date = {2012-12-12}, organization = {Volatility Labs}, url = {https://volatility-labs.blogspot.com/2012/12/unpacking-dexter-pos-memory-dump.html}, language = {English}, urldate = {2020-01-13} } Unpacking Dexter POS "Memory Dump Parsing" Malware
Dexter
Yara Rules
[TLP:WHITE] win_dexter_auto (20210616 | Detects win.dexter.)
rule win_dexter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.dexter."
        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.dexter"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 034508 894508 8b5508 83c201 }
            // n = 4, score = 400
            //   034508               | add                 eax, dword ptr [ebp + 8]
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   83c201               | add                 edx, 1

        $sequence_1 = { 8b4508 50 8b4d10 51 ff15???????? 8b55f8 52 }
            // n = 7, score = 400
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   52                   | push                edx

        $sequence_2 = { a3???????? 833d????????00 750d 6860ea0000 }
            // n = 4, score = 400
            //   a3????????           |                     
            //   833d????????00       |                     
            //   750d                 | jne                 0xf
            //   6860ea0000           | push                0xea60

        $sequence_3 = { 8b5508 83c201 895508 8d45f4 50 e8???????? }
            // n = 6, score = 400
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   83c201               | add                 edx, 1
            //   895508               | mov                 dword ptr [ebp + 8], edx
            //   8d45f4               | lea                 eax, dword ptr [ebp - 0xc]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 3b450c 7d32 e8???????? 99 b919000000 }
            // n = 5, score = 400
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]
            //   7d32                 | jge                 0x34
            //   e8????????           |                     
            //   99                   | cdq                 
            //   b919000000           | mov                 ecx, 0x19

        $sequence_5 = { 85c0 7428 8b0d???????? 51 ff15???????? 85c0 750a }
            // n = 7, score = 400
            //   85c0                 | test                eax, eax
            //   7428                 | je                  0x2a
            //   8b0d????????         |                     
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc

        $sequence_6 = { 6a0a 68???????? 68???????? ff15???????? 50 68???????? e8???????? }
            // n = 7, score = 400
            //   6a0a                 | push                0xa
            //   68????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_7 = { 837df400 7511 6a00 e8???????? 83c404 }
            // n = 5, score = 400
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   7511                 | jne                 0x13
            //   6a00                 | push                0
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_8 = { 68???????? e8???????? 83c404 83f801 7505 e9???????? 8b0d???????? }
            // n = 7, score = 400
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83f801               | cmp                 eax, 1
            //   7505                 | jne                 7
            //   e9????????           |                     
            //   8b0d????????         |                     

        $sequence_9 = { 83fa63 7502 eb44 8b4510 8a4dfa }
            // n = 5, score = 400
            //   83fa63               | cmp                 edx, 0x63
            //   7502                 | jne                 4
            //   eb44                 | jmp                 0x46
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8a4dfa               | mov                 cl, byte ptr [ebp - 6]

    condition:
        7 of them and filesize < 98304
}
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