SYMBOLCOMMON_NAMEaka. SYNONYMS
win.bart (Back to overview)

Bart


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References
2020-06-22CERT-FRCERT-FR
@techreport{certfr:20200622:volution:fba1cfa, author = {CERT-FR}, title = {{Évolution De Lactivité du Groupe Cybercriminel TA505}}, date = {2020-06-22}, institution = {CERT-FR}, url = {https://www.cert.ssi.gouv.fr/uploads/CERTFR-2020-CTI-006.pdf}, language = {French}, urldate = {2020-06-24} } Évolution De Lactivité du Groupe Cybercriminel TA505
Amadey AndroMut Bart Clop Dridex FlawedGrace Gandcrab Get2 GlobeImposter Jaff Locky Marap Philadephia Ransom QuantLoader Scarab Ransomware SDBbot ServHelper Silence tRat TrickBot
2020-05-21Intel 471Intel 471
@online{471:20200521:brief:048d164, author = {Intel 471}, title = {{A brief history of TA505}}, date = {2020-05-21}, organization = {Intel 471}, url = {https://blog.intel471.com/2020/05/21/a-brief-history-of-ta505/}, language = {English}, urldate = {2020-05-23} } A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
Yara Rules
[TLP:WHITE] win_bart_auto (20200529 | autogenerated rule brought to you by yara-signator)
rule win_bart_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        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.bart"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 = { 3bc6 7404 1bd2 f7da 89040b 83c104 4f }
            // n = 7, score = 100
            //   3bc6                 | cmp                 eax, esi
            //   7404                 | je                  6
            //   1bd2                 | sbb                 edx, edx
            //   f7da                 | neg                 edx
            //   89040b               | mov                 dword ptr [ebx + ecx], eax
            //   83c104               | add                 ecx, 4
            //   4f                   | dec                 edi

        $sequence_1 = { ff15???????? 59 8b45f0 8945d4 eb04 8365d400 33c0 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   eb04                 | jmp                 6
            //   8365d400             | and                 dword ptr [ebp - 0x2c], 0
            //   33c0                 | xor                 eax, eax

        $sequence_2 = { c745dc01000000 84db 7e1a 8b7dd0 8bca 8bf7 2bf2 }
            // n = 7, score = 100
            //   c745dc01000000       | mov                 dword ptr [ebp - 0x24], 1
            //   84db                 | test                bl, bl
            //   7e1a                 | jle                 0x1c
            //   8b7dd0               | mov                 edi, dword ptr [ebp - 0x30]
            //   8bca                 | mov                 ecx, edx
            //   8bf7                 | mov                 esi, edi
            //   2bf2                 | sub                 esi, edx

        $sequence_3 = { 0572b00100 03c7 8945f0 8a4432ff 8845ff }
            // n = 5, score = 100
            //   0572b00100           | add                 eax, 0x1b072
            //   03c7                 | add                 eax, edi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8a4432ff             | mov                 al, byte ptr [edx + esi - 1]
            //   8845ff               | mov                 byte ptr [ebp - 1], al

        $sequence_4 = { 8b450c c1e902 f3a5 8bcb 83e103 f3a4 5f }
            // n = 7, score = 100
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bcb                 | mov                 ecx, ebx
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   5f                   | pop                 edi

        $sequence_5 = { 83c410 83c0fe 0fb7c0 8985c8feffff 6685c0 0f8eab000000 98 }
            // n = 7, score = 100
            //   83c410               | add                 esp, 0x10
            //   83c0fe               | add                 eax, -2
            //   0fb7c0               | movzx               eax, ax
            //   8985c8feffff         | mov                 dword ptr [ebp - 0x138], eax
            //   6685c0               | test                ax, ax
            //   0f8eab000000         | jle                 0xb1
            //   98                   | cwde                

        $sequence_6 = { 83c704 83c604 4b 75e5 8b4dfc 5f }
            // n = 6, score = 100
            //   83c704               | add                 edi, 4
            //   83c604               | add                 esi, 4
            //   4b                   | dec                 ebx
            //   75e5                 | jne                 0xffffffe7
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   5f                   | pop                 edi

        $sequence_7 = { ffb570ffffff e8???????? 8d4584 50 8d45c4 }
            // n = 5, score = 100
            //   ffb570ffffff         | push                dword ptr [ebp - 0x90]
            //   e8????????           |                     
            //   8d4584               | lea                 eax, [ebp - 0x7c]
            //   50                   | push                eax
            //   8d45c4               | lea                 eax, [ebp - 0x3c]

        $sequence_8 = { 833c8200 7505 80c3ff 79f2 80c301 7504 }
            // n = 6, score = 100
            //   833c8200             | cmp                 dword ptr [edx + eax*4], 0
            //   7505                 | jne                 7
            //   80c3ff               | add                 bl, 0xff
            //   79f2                 | jns                 0xfffffff4
            //   80c301               | add                 bl, 1
            //   7504                 | jne                 6

        $sequence_9 = { 8b4df0 e8???????? 33c0 40 83e001 740a ff75f0 }
            // n = 7, score = 100
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   83e001               | and                 eax, 1
            //   740a                 | je                  0xc
            //   ff75f0               | push                dword ptr [ebp - 0x10]

    condition:
        7 of them and filesize < 163840
}
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