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 (20220808 | Detects win.dexter.)
rule win_dexter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8bec 51 c745fc00000000 833d????????00 741e 8d45fc }
            // n = 6, score = 400
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   833d????????00       |                     
            //   741e                 | je                  0x20
            //   8d45fc               | lea                 eax, [ebp - 4]

        $sequence_1 = { 83c404 83f801 7505 e9???????? }
            // n = 4, score = 400
            //   83c404               | add                 esp, 4
            //   83f801               | cmp                 eax, 1
            //   7505                 | jne                 7
            //   e9????????           |                     

        $sequence_2 = { 6a01 e8???????? 83c404 68d0070000 ff15???????? }
            // n = 5, score = 400
            //   6a01                 | push                1
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   68d0070000           | push                0x7d0
            //   ff15????????         |                     

        $sequence_3 = { 68???????? 8b4d0c 51 e8???????? 83c410 8b55fc d1e2 }
            // n = 7, score = 400
            //   68????????           |                     
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   d1e2                 | shl                 edx, 1

        $sequence_4 = { 837df400 7511 6a01 e8???????? 83c404 }
            // n = 5, score = 400
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   7511                 | jne                 0x13
            //   6a01                 | push                1
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_5 = { 68???????? 68???????? ff15???????? 6a00 ff15???????? a3???????? }
            // n = 6, score = 400
            //   68????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   a3????????           |                     

        $sequence_6 = { e8???????? 83c404 85c0 740c 0fbe4d08 83e930 }
            // n = 6, score = 400
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   740c                 | je                  0xe
            //   0fbe4d08             | movsx               ecx, byte ptr [ebp + 8]
            //   83e930               | sub                 ecx, 0x30

        $sequence_7 = { 68???????? e8???????? 83c408 6a0a 6a00 68???????? e8???????? }
            // n = 7, score = 400
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   6a0a                 | push                0xa
            //   6a00                 | push                0
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_8 = { 8945f8 68???????? ff15???????? 50 8b45fc }
            // n = 5, score = 400
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   68????????           |                     
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_9 = { 83c410 8b55fc d1e2 52 8b45f8 }
            // n = 5, score = 400
            //   83c410               | add                 esp, 0x10
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   d1e2                 | shl                 edx, 1
            //   52                   | push                edx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

    condition:
        7 of them and filesize < 98304
}
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