SYMBOLCOMMON_NAMEaka. SYNONYMS
win.exaramel (Back to overview)

Exaramel

Actor(s): TeleBots


There is no description at this point.

References
2020-01-31Virus BulletinMichal Poslušný, Peter Kálnai
@online{poslun:20200131:rich:c25f156, author = {Michal Poslušný and Peter Kálnai}, title = {{Rich Headers: leveraging this mysterious artifact of the PE format}}, date = {2020-01-31}, organization = {Virus Bulletin}, url = {https://www.virusbulletin.com/virusbulletin/2020/01/vb2019-paper-rich-headers-leveraging-mysterious-artifact-pe-format/}, language = {English}, urldate = {2020-02-03} } Rich Headers: leveraging this mysterious artifact of the PE format
Dridex Exaramel Industroyer Neutrino RCS Sathurbot
2020-01DragosJoe Slowik
@techreport{slowik:202001:threat:d891011, author = {Joe Slowik}, title = {{Threat Intelligence and the Limits of Malware Analysis}}, date = {2020-01}, institution = {Dragos}, url = {https://pylos.co/wp-content/uploads/2020/02/Threat-Intelligence-and-the-Limits-of-Malware-Analysis.pdf}, language = {English}, urldate = {2020-06-10} } Threat Intelligence and the Limits of Malware Analysis
Exaramel Exaramel Industroyer Lookback NjRAT PlugX
2018-10-11ESET ResearchAnton Cherepanov, Robert Lipovsky
@online{cherepanov:20181011:new:8e588c3, author = {Anton Cherepanov and Robert Lipovsky}, title = {{New TeleBots backdoor: First evidence linking Industroyer to NotPetya}}, date = {2018-10-11}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2018/10/11/new-telebots-backdoor-linking-industroyer-notpetya/}, language = {English}, urldate = {2019-11-14} } New TeleBots backdoor: First evidence linking Industroyer to NotPetya
Exaramel EternalPetya Exaramel Industroyer
Yara Rules
[TLP:WHITE] win_exaramel_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_exaramel_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.exaramel"
        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 = { c10100 52 c10100 66c10100 78c1 }
            // n = 5, score = 100
            //   c10100               | rol                 dword ptr [ecx], 0
            //   52                   | push                edx
            //   c10100               | rol                 dword ptr [ecx], 0
            //   66c10100             | rol                 word ptr [ecx], 0
            //   78c1                 | js                  0xffffffc3

        $sequence_1 = { 85f6 7419 56 50 53 51 8d85acedffff }
            // n = 7, score = 100
            //   85f6                 | test                esi, esi
            //   7419                 | je                  0x1b
            //   56                   | push                esi
            //   50                   | push                eax
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   8d85acedffff         | lea                 eax, [ebp - 0x1254]

        $sequence_2 = { 8b35???????? 68???????? ff35???????? a3???????? c705????????01000000 ffd6 }
            // n = 6, score = 100
            //   8b35????????         |                     
            //   68????????           |                     
            //   ff35????????         |                     
            //   a3????????           |                     
            //   c705????????01000000     |     
            //   ffd6                 | call                esi

        $sequence_3 = { 8b4508 56 8b750c c70600000000 85c0 743c }
            // n = 6, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   56                   | push                esi
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   85c0                 | test                eax, eax
            //   743c                 | je                  0x3e

        $sequence_4 = { 7439 6aff 50 ff15???????? 85c0 7538 56 }
            // n = 7, score = 100
            //   7439                 | je                  0x3b
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7538                 | jne                 0x3a
            //   56                   | push                esi

        $sequence_5 = { 83c408 8bf0 ff7704 ff15???????? 85f6 7414 5f }
            // n = 7, score = 100
            //   83c408               | add                 esp, 8
            //   8bf0                 | mov                 esi, eax
            //   ff7704               | push                dword ptr [edi + 4]
            //   ff15????????         |                     
            //   85f6                 | test                esi, esi
            //   7414                 | je                  0x16
            //   5f                   | pop                 edi

        $sequence_6 = { 6a00 6a00 6803800000 ff75f8 ff15???????? 85c0 0f84bc000000 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6803800000           | push                0x8003
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f84bc000000         | je                  0xc2

        $sequence_7 = { ff15???????? 8b4d08 8bf8 8d45fc 50 57 8b11 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8bf8                 | mov                 edi, eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   57                   | push                edi
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_8 = { 53 e8???????? 83c404 50 53 6802100000 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax
            //   53                   | push                ebx
            //   6802100000           | push                0x1002

        $sequence_9 = { 6bd830 8b04bd60dd4100 f644032801 7444 837c0318ff 743d e8???????? }
            // n = 7, score = 100
            //   6bd830               | imul                ebx, eax, 0x30
            //   8b04bd60dd4100       | mov                 eax, dword ptr [edi*4 + 0x41dd60]
            //   f644032801           | test                byte ptr [ebx + eax + 0x28], 1
            //   7444                 | je                  0x46
            //   837c0318ff           | cmp                 dword ptr [ebx + eax + 0x18], -1
            //   743d                 | je                  0x3f
            //   e8????????           |                     

    condition:
        7 of them and filesize < 294912
}
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