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 (20220411 | Detects win.dexter.)
rule win_dexter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "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 = { 8b0d???????? 51 e8???????? 83c40c eb1a 6a00 }
            // n = 6, score = 400
            //   8b0d????????         |                     
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   eb1a                 | jmp                 0x1c
            //   6a00                 | push                0

        $sequence_1 = { 83f801 7411 68???????? 8b4d08 }
            // n = 4, score = 400
            //   83f801               | cmp                 eax, 1
            //   7411                 | je                  0x13
            //   68????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_2 = { ff15???????? 8945fc 8b4dfc d1e1 51 6a08 8b15???????? }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   d1e1                 | shl                 ecx, 1
            //   51                   | push                ecx
            //   6a08                 | push                8
            //   8b15????????         |                     

        $sequence_3 = { c705????????00000000 68???????? ff15???????? 837d0801 }
            // n = 4, score = 400
            //   c705????????00000000     |     
            //   68????????           |                     
            //   ff15????????         |                     
            //   837d0801             | cmp                 dword ptr [ebp + 8], 1

        $sequence_4 = { 6a00 6a00 6a06 8b15???????? 52 }
            // n = 5, score = 400
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a06                 | push                6
            //   8b15????????         |                     
            //   52                   | push                edx

        $sequence_5 = { 83ec0c 8b4508 0fbe08 83f928 7404 33c0 eb3e }
            // n = 7, score = 400
            //   83ec0c               | sub                 esp, 0xc
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   0fbe08               | movsx               ecx, byte ptr [eax]
            //   83f928               | cmp                 ecx, 0x28
            //   7404                 | je                  6
            //   33c0                 | xor                 eax, eax
            //   eb3e                 | jmp                 0x40

        $sequence_6 = { 50 ff15???????? 68e8030000 ff15???????? e9???????? 833d????????00 741e }
            // n = 7, score = 400
            //   50                   | push                eax
            //   ff15????????         |                     
            //   68e8030000           | push                0x3e8
            //   ff15????????         |                     
            //   e9????????           |                     
            //   833d????????00       |                     
            //   741e                 | je                  0x20

        $sequence_7 = { eb44 8b4510 8a4dfa 8808 8b5510 }
            // n = 5, score = 400
            //   eb44                 | jmp                 0x46
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8a4dfa               | mov                 cl, byte ptr [ebp - 6]
            //   8808                 | mov                 byte ptr [eax], cl
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]

        $sequence_8 = { 50 ff15???????? e9???????? 6a59 ff15???????? }
            // n = 5, score = 400
            //   50                   | push                eax
            //   ff15????????         |                     
            //   e9????????           |                     
            //   6a59                 | push                0x59
            //   ff15????????         |                     

        $sequence_9 = { 51 ff15???????? 6aff 8b15???????? 52 }
            // n = 5, score = 400
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   6aff                 | push                -1
            //   8b15????????         |                     
            //   52                   | push                edx

    condition:
        7 of them and filesize < 98304
}
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