SYMBOLCOMMON_NAMEaka. SYNONYMS
win.downeks (Back to overview)

Downeks

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References
2020-03-03Palo Alto Networks Unit 42Robert Falcone, Bryan Lee, Alex Hinchliffe
@online{falcone:20200303:molerats:990b000, author = {Robert Falcone and Bryan Lee and Alex Hinchliffe}, title = {{Molerats Delivers Spark Backdoor to Government and Telecommunications Organizations}}, date = {2020-03-03}, organization = {Palo Alto Networks Unit 42}, url = {https://unit42.paloaltonetworks.com/molerats-delivers-spark-backdoor/}, language = {English}, urldate = {2020-03-03} } Molerats Delivers Spark Backdoor to Government and Telecommunications Organizations
Downeks JhoneRAT Molerat Loader Spark
2017-01-30Palo Alto Networks Unit 42Mashav Sapir, Tomer Bar, Netanel Rimer, Taras Malivanchuk, Yaron Samuel, Simon Conant
@online{sapir:20170130:downeks:07fcd1e, author = {Mashav Sapir and Tomer Bar and Netanel Rimer and Taras Malivanchuk and Yaron Samuel and Simon Conant}, title = {{Downeks and Quasar RAT Used in Recent Targeted Attacks Against Governments}}, date = {2017-01-30}, organization = {Palo Alto Networks Unit 42}, url = {http://researchcenter.paloaltonetworks.com/2017/01/unit42-downeks-and-quasar-rat-used-in-recent-targeted-attacks-against-governments/?adbsc=social69739136&adbid=826218465723756545&adbpl=tw&adbpr=4487645412}, language = {English}, urldate = {2019-12-20} } Downeks and Quasar RAT Used in Recent Targeted Attacks Against Governments
Downeks
Yara Rules
[TLP:WHITE] win_downeks_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_downeks_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.downeks"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 66833800 75f7 33c9 2d2c110904 d1f8 894dd0 894dcc }
            // n = 7, score = 200
            //   66833800             | cmp                 word ptr [eax], 0
            //   75f7                 | jne                 0xfffffff9
            //   33c9                 | xor                 ecx, ecx
            //   2d2c110904           | sub                 eax, 0x409112c
            //   d1f8                 | sar                 eax, 1
            //   894dd0               | mov                 dword ptr [ebp - 0x30], ecx
            //   894dcc               | mov                 dword ptr [ebp - 0x34], ecx

        $sequence_1 = { 8db538ffffff e9???????? 8d4dbc e9???????? 8d4dd4 e9???????? 8d4dd4 }
            // n = 7, score = 200
            //   8db538ffffff         | lea                 esi, [ebp - 0xc8]
            //   e9????????           |                     
            //   8d4dbc               | lea                 ecx, [ebp - 0x44]
            //   e9????????           |                     
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   e9????????           |                     
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]

        $sequence_2 = { 8bf1 c7064c330904 7409 56 e8???????? 83c404 8bc6 }
            // n = 7, score = 200
            //   8bf1                 | mov                 esi, ecx
            //   c7064c330904         | mov                 dword ptr [esi], 0x409334c
            //   7409                 | je                  0xb
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { c1cf02 33df 035dfc 8b7ddc 0bfe 23f9 897df8 }
            // n = 7, score = 200
            //   c1cf02               | ror                 edi, 2
            //   33df                 | xor                 ebx, edi
            //   035dfc               | add                 ebx, dword ptr [ebp - 4]
            //   8b7ddc               | mov                 edi, dword ptr [ebp - 0x24]
            //   0bfe                 | or                  edi, esi
            //   23f9                 | and                 edi, ecx
            //   897df8               | mov                 dword ptr [ebp - 8], edi

        $sequence_4 = { 0f8536010000 56 e8???????? 59 bb60e20904 83f8ff 742e }
            // n = 7, score = 200
            //   0f8536010000         | jne                 0x13c
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   bb60e20904           | mov                 ebx, 0x409e260
            //   83f8ff               | cmp                 eax, -1
            //   742e                 | je                  0x30

        $sequence_5 = { eb34 8bc2 6bc064 2bc8 8d0455b0260904 0fb610 8816 }
            // n = 7, score = 200
            //   eb34                 | jmp                 0x36
            //   8bc2                 | mov                 eax, edx
            //   6bc064               | imul                eax, eax, 0x64
            //   2bc8                 | sub                 ecx, eax
            //   8d0455b0260904       | lea                 eax, [edx*2 + 0x40926b0]
            //   0fb610               | movzx               edx, byte ptr [eax]
            //   8816                 | mov                 byte ptr [esi], dl

        $sequence_6 = { e8???????? 8bf8 83c40c 8d45dc 50 89bd24fbffff ff15???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   83c40c               | add                 esp, 0xc
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   89bd24fbffff         | mov                 dword ptr [ebp - 0x4dc], edi
            //   ff15????????         |                     

        $sequence_7 = { 50 8bc3 e8???????? 53 8d4da4 51 8db544ffffff }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8bc3                 | mov                 eax, ebx
            //   e8????????           |                     
            //   53                   | push                ebx
            //   8d4da4               | lea                 ecx, [ebp - 0x5c]
            //   51                   | push                ecx
            //   8db544ffffff         | lea                 esi, [ebp - 0xbc]

        $sequence_8 = { eb15 8b03 6840400804 50 e8???????? be43000000 83c408 }
            // n = 7, score = 200
            //   eb15                 | jmp                 0x17
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   6840400804           | push                0x4084040
            //   50                   | push                eax
            //   e8????????           |                     
            //   be43000000           | mov                 esi, 0x43
            //   83c408               | add                 esp, 8

        $sequence_9 = { 8bec 8b4d08 33c0 85c9 7426 8b9140020000 394218 }
            // n = 7, score = 200
            //   8bec                 | mov                 ebp, esp
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   33c0                 | xor                 eax, eax
            //   85c9                 | test                ecx, ecx
            //   7426                 | je                  0x28
            //   8b9140020000         | mov                 edx, dword ptr [ecx + 0x240]
            //   394218               | cmp                 dword ptr [edx + 0x18], eax

    condition:
        7 of them and filesize < 1318912
}
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