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 (20220516 | Detects win.rambo.)
rule win_rambo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.rambo."
        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.rambo"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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???????? 56 ff15???????? 8d85ecfdffff 50 8d85f0feffff 50 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax
            //   8d85f0feffff         | lea                 eax, [ebp - 0x110]
            //   50                   | push                eax

        $sequence_1 = { 56 6a01 ff7508 e8???????? 59 50 ff7508 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   6a01                 | push                1
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_2 = { 8d85fcfeffff 59 50 ff15???????? 33c0 c9 c3 }
            // n = 7, score = 200
            //   8d85fcfeffff         | lea                 eax, [ebp - 0x104]
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   c9                   | leave               
            //   c3                   | ret                 

        $sequence_3 = { e8???????? ff750c 8d85ecfdffff 50 e8???????? }
            // n = 5, score = 200
            //   e8????????           |                     
            // 
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 745e 57 6a02 6a00 56 }
            // n = 5, score = 200
            //   745e                 | je                  0x60
            //   57                   | push                edi
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   56                   | push                esi

        $sequence_5 = { ff15???????? ff7508 8d85f8feffff 50 e8???????? 8065fe00 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8065fe00             | and                 byte ptr [ebp - 2], 0

        $sequence_6 = { 50 ff15???????? 83c41c 6a01 58 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c41c               | add                 esp, 0x1c
            //   6a01                 | push                1
            //   58                   | pop                 eax

        $sequence_7 = { ff15???????? 56 ff15???????? 56 8bf8 ff15???????? 56 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_8 = { 8bca 8d542474 83e103 f3aa 8bcb 8d7c2474 8bc1 }
            // n = 7, score = 100
            //   8bca                 | mov                 ecx, edx
            //   8d542474             | lea                 edx, [esp + 0x74]
            //   83e103               | and                 ecx, 3
            //   f3aa                 | rep stosb           byte ptr es:[edi], al
            //   8bcb                 | mov                 ecx, ebx
            //   8d7c2474             | lea                 edi, [esp + 0x74]
            //   8bc1                 | mov                 eax, ecx

        $sequence_9 = { 6a00 50 8d4c2424 c684240c04000007 }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   c684240c04000007     | mov                 byte ptr [esp + 0x40c], 7

        $sequence_10 = { e8???????? 8d4c2428 c684240004000005 e8???????? 8d4c2424 c684240004000006 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8d4c2428             | lea                 ecx, [esp + 0x28]
            //   c684240004000005     | mov                 byte ptr [esp + 0x400], 5
            //   e8????????           |                     
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   c684240004000006     | mov                 byte ptr [esp + 0x400], 6

        $sequence_11 = { c644245637 885c2457 884c2459 c644245a47 }
            // n = 4, score = 100
            //   c644245637           | mov                 byte ptr [esp + 0x56], 0x37
            //   885c2457             | mov                 byte ptr [esp + 0x57], bl
            //   884c2459             | mov                 byte ptr [esp + 0x59], cl
            //   c644245a47           | mov                 byte ptr [esp + 0x5a], 0x47

        $sequence_12 = { ffd5 8bf8 8a4304 8b7604 84c0 }
            // n = 5, score = 100
            //   ffd5                 | call                ebp
            //   8bf8                 | mov                 edi, eax
            //   8a4304               | mov                 al, byte ptr [ebx + 4]
            //   8b7604               | mov                 esi, dword ptr [esi + 4]
            //   84c0                 | test                al, al

        $sequence_13 = { e8???????? 8d8c249c000000 c68424000400000b e8???????? 8d4c2420 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8d8c249c000000       | lea                 ecx, [esp + 0x9c]
            //   c68424000400000b     | mov                 byte ptr [esp + 0x400], 0xb
            //   e8????????           |                     
            //   8d4c2420             | lea                 ecx, [esp + 0x20]

        $sequence_14 = { c1e805 03c3 8bdf c1e304 03dd 8b6c2418 }
            // n = 6, score = 100
            //   c1e805               | shr                 eax, 5
            //   03c3                 | add                 eax, ebx
            //   8bdf                 | mov                 ebx, edi
            //   c1e304               | shl                 ebx, 4
            //   03dd                 | add                 ebx, ebp
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]

        $sequence_15 = { e8???????? 8d4c2430 c684240004000001 e8???????? c684240004000000 8d4c2464 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   c684240004000001     | mov                 byte ptr [esp + 0x400], 1
            //   e8????????           |                     
            //   c684240004000000     | mov                 byte ptr [esp + 0x400], 0
            //   8d4c2464             | lea                 ecx, [esp + 0x64]

    condition:
        7 of them and filesize < 57344
}
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