SYMBOLCOMMON_NAMEaka. SYNONYMS
win.rambo (Back to overview)

Rambo

aka: brebsd

Actor(s): DragonOK


There is no description at this point.

References
2020SecureworksSecureWorks
@online{secureworks:2020:bronze:79d8dd2, author = {SecureWorks}, title = {{BRONZE OVERBROOK}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/bronze-overbrook}, language = {English}, urldate = {2020-05-23} } BRONZE OVERBROOK
Aveo DDKONG IsSpace PLAINTEE PlugX Rambo DragonOK
2017-02-15MorphickNick Hoffman, Jeremy Humble
@techreport{hoffman:20170215:deep:37a8ef5, author = {Nick Hoffman and Jeremy Humble}, title = {{Deep Dive on the DragonOK Rambo Backdoor}}, date = {2017-02-15}, institution = {Morphick}, url = {https://github.com/m0n0ph1/APT_CyberCriminal_Campagin_Collections-1/blob/master/2017/2017.02.15.deep-dive-dragonok-rambo-backdoor/Deep%20Dive%20on%20the%20DragonOK%20Rambo%20Backdoor%20_%20Morphick%20Cyber%20Security.pdf}, language = {English}, urldate = {2020-04-08} } Deep Dive on the DragonOK Rambo Backdoor
Rambo DragonOK
2017-02-15Adventures in SecurityNick Hoffman
@online{hoffman:20170215:rambo:fef31fe, author = {Nick Hoffman}, title = {{The Rambo Backdoor}}, date = {2017-02-15}, organization = {Adventures in Security}, url = {https://securitykitten.github.io/2017/02/15/the-rambo-backdoor.html}, language = {English}, urldate = {2020-01-10} } The Rambo Backdoor
Rambo
Yara Rules
[TLP:WHITE] win_rambo_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_rambo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rambo"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { ff15???????? 8d85f8faffff 50 68???????? }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   8d85f8faffff         | lea                 eax, [ebp - 0x508]
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_1 = { 8bf8 ff15???????? 56 57 8d85f8faffff }
            // n = 5, score = 200
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d85f8faffff         | lea                 eax, [ebp - 0x508]

        $sequence_2 = { 8d85ecfdffff 50 e8???????? ff750c 8d85ecfdffff }
            // n = 5, score = 200
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax
            //   e8????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]

        $sequence_3 = { ff7508 8d85f8feffff 50 e8???????? 8065fe00 }
            // n = 5, score = 200
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8065fe00             | and                 byte ptr [ebp - 2], 0

        $sequence_4 = { 85f6 7437 56 6a01 }
            // n = 4, score = 200
            //   85f6                 | test                esi, esi
            //   7437                 | je                  0x39
            //   56                   | push                esi
            //   6a01                 | push                1

        $sequence_5 = { 83c410 85f6 745e 57 6a02 6a00 56 }
            // n = 7, score = 200
            //   83c410               | add                 esp, 0x10
            //   85f6                 | test                esi, esi
            //   745e                 | je                  0x60
            //   57                   | push                edi
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   56                   | push                esi

        $sequence_6 = { 56 6800040000 8d85f8faffff 6a00 }
            // n = 4, score = 200
            //   56                   | push                esi
            //   6800040000           | push                0x400
            //   8d85f8faffff         | lea                 eax, [ebp - 0x508]
            //   6a00                 | push                0

        $sequence_7 = { 80a43df8faffff00 56 ff15???????? 83c428 6a32 ff15???????? 8d85f8faffff }
            // n = 7, score = 200
            //   80a43df8faffff00     | and                 byte ptr [ebp + edi - 0x508], 0
            //   56                   | push                esi
            //   ff15????????         |                     
            //   83c428               | add                 esp, 0x28
            //   6a32                 | push                0x32
            //   ff15????????         |                     
            //   8d85f8faffff         | lea                 eax, [ebp - 0x508]

        $sequence_8 = { 8d4c246c e8???????? 56 56 8d4c2424 e8???????? }
            // n = 6, score = 100
            //   8d4c246c             | lea                 ecx, [esp + 0x6c]
            //   e8????????           |                     
            //   56                   | push                esi
            //   56                   | push                esi
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   e8????????           |                     

        $sequence_9 = { e8???????? 8d4c2464 c684240004000001 e8???????? 6a02 68fcfeffff 8d4c246c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d4c2464             | lea                 ecx, [esp + 0x64]
            //   c684240004000001     | mov                 byte ptr [esp + 0x400], 1
            //   e8????????           |                     
            //   6a02                 | push                2
            //   68fcfeffff           | push                0xfffffefc
            //   8d4c246c             | lea                 ecx, [esp + 0x6c]

        $sequence_10 = { 75b9 8b5c241c 8b2d???????? 8a4304 84c0 }
            // n = 5, score = 100
            //   75b9                 | jne                 0xffffffbb
            //   8b5c241c             | mov                 ebx, dword ptr [esp + 0x1c]
            //   8b2d????????         |                     
            //   8a4304               | mov                 al, byte ptr [ebx + 4]
            //   84c0                 | test                al, al

        $sequence_11 = { f3a5 6804010000 8d4c2434 66a5 e8???????? b941000000 }
            // n = 6, score = 100
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   6804010000           | push                0x104
            //   8d4c2434             | lea                 ecx, [esp + 0x34]
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]
            //   e8????????           |                     
            //   b941000000           | mov                 ecx, 0x41

        $sequence_12 = { c68424040400000b e8???????? 50 6804010000 ff15???????? }
            // n = 5, score = 100
            //   c68424040400000b     | mov                 byte ptr [esp + 0x404], 0xb
            //   e8????????           |                     
            //   50                   | push                eax
            //   6804010000           | push                0x104
            //   ff15????????         |                     

        $sequence_13 = { 83fb08 7d78 8bcb 33c0 8bd1 8d7c245c c1e902 }
            // n = 7, score = 100
            //   83fb08               | cmp                 ebx, 8
            //   7d78                 | jge                 0x7a
            //   8bcb                 | mov                 ecx, ebx
            //   33c0                 | xor                 eax, eax
            //   8bd1                 | mov                 edx, ecx
            //   8d7c245c             | lea                 edi, [esp + 0x5c]
            //   c1e902               | shr                 ecx, 2

        $sequence_14 = { 8bef 2bee 8bf3 8d4c2464 2bf7 }
            // n = 5, score = 100
            //   8bef                 | mov                 ebp, edi
            //   2bee                 | sub                 ebp, esi
            //   8bf3                 | mov                 esi, ebx
            //   8d4c2464             | lea                 ecx, [esp + 0x64]
            //   2bf7                 | sub                 esi, edi

        $sequence_15 = { 56 8b742420 57 84c0 8b3e 895c241c 7405 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8b742420             | mov                 esi, dword ptr [esp + 0x20]
            //   57                   | push                edi
            //   84c0                 | test                al, al
            //   8b3e                 | mov                 edi, dword ptr [esi]
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx
            //   7405                 | je                  7

    condition:
        7 of them and filesize < 57344
}
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