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 (20210616 | Detects win.rambo.)
rule win_rambo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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???????? 8bf0 83c420 85f6 7437 }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83c420               | add                 esp, 0x20
            //   85f6                 | test                esi, esi
            //   7437                 | je                  0x39

        $sequence_1 = { 56 ff15???????? 83c428 6a32 ff15???????? 8d85f8faffff 50 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   ff15????????         |                     
            //   83c428               | add                 esp, 0x28
            //   6a32                 | push                0x32
            //   ff15????????         |                     
            //   8d85f8faffff         | lea                 eax, dword ptr [ebp - 0x508]
            //   50                   | push                eax

        $sequence_2 = { c645fd62 ff15???????? 8bf0 83c410 85f6 745e }
            // n = 6, score = 200
            //   c645fd62             | mov                 byte ptr [ebp - 3], 0x62
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83c410               | add                 esp, 0x10
            //   85f6                 | test                esi, esi
            //   745e                 | je                  0x60

        $sequence_3 = { 5e c9 c3 55 8bec 81ec08050000 56 }
            // n = 7, score = 200
            //   5e                   | pop                 esi
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec08050000         | sub                 esp, 0x508
            //   56                   | push                esi

        $sequence_4 = { 81ec08050000 56 6800040000 8d85f8faffff }
            // n = 4, score = 200
            //   81ec08050000         | sub                 esp, 0x508
            //   56                   | push                esi
            //   6800040000           | push                0x400
            //   8d85f8faffff         | lea                 eax, dword ptr [ebp - 0x508]

        $sequence_5 = { 57 8d85f8faffff 6a01 50 ff15???????? 80a43df8faffff00 }
            // n = 6, score = 200
            //   57                   | push                edi
            //   8d85f8faffff         | lea                 eax, dword ptr [ebp - 0x508]
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   80a43df8faffff00     | and                 byte ptr [ebp + edi - 0x508], 0

        $sequence_6 = { ff7508 e8???????? 59 50 ff7508 ff15???????? 56 }
            // n = 7, score = 200
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_7 = { 7437 56 6a01 ff7508 e8???????? }
            // n = 5, score = 200
            //   7437                 | je                  0x39
            //   56                   | push                esi
            //   6a01                 | push                1
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_8 = { c7842400040000ffffffff e8???????? b801000000 e9???????? 83c9ff }
            // n = 5, score = 100
            //   c7842400040000ffffffff     | mov    dword ptr [esp + 0x400], 0xffffffff
            //   e8????????           |                     
            //   b801000000           | mov                 eax, 1
            //   e9????????           |                     
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_9 = { 8d7c240d 8844240c f3ab 66ab 8d4c240c 6804010000 }
            // n = 6, score = 100
            //   8d7c240d             | lea                 edi, dword ptr [esp + 0xd]
            //   8844240c             | mov                 byte ptr [esp + 0xc], al
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   8d4c240c             | lea                 ecx, dword ptr [esp + 0xc]
            //   6804010000           | push                0x104

        $sequence_10 = { 03dd 8b6c2418 33c3 8d1c39 33c3 8b5c2414 2bf0 }
            // n = 7, score = 100
            //   03dd                 | add                 ebx, ebp
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]
            //   33c3                 | xor                 eax, ebx
            //   8d1c39               | lea                 ebx, dword ptr [ecx + edi]
            //   33c3                 | xor                 eax, ebx
            //   8b5c2414             | mov                 ebx, dword ptr [esp + 0x14]
            //   2bf0                 | sub                 esi, eax

        $sequence_11 = { 68fcfeffff 8d4c246c e8???????? 8d4c2430 e8???????? 6804010000 }
            // n = 6, score = 100
            //   68fcfeffff           | push                0xfffffefc
            //   8d4c246c             | lea                 ecx, dword ptr [esp + 0x6c]
            //   e8????????           |                     
            //   8d4c2430             | lea                 ecx, dword ptr [esp + 0x30]
            //   e8????????           |                     
            //   6804010000           | push                0x104

        $sequence_12 = { 8a54240c 8bc1 8b4c2408 8908 8b4c2404 85c9 }
            // n = 6, score = 100
            //   8a54240c             | mov                 dl, byte ptr [esp + 0xc]
            //   8bc1                 | mov                 eax, ecx
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   8908                 | mov                 dword ptr [eax], ecx
            //   8b4c2404             | mov                 ecx, dword ptr [esp + 4]
            //   85c9                 | test                ecx, ecx

        $sequence_13 = { e8???????? 8d4c241c 89442410 e8???????? }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8d4c241c             | lea                 ecx, dword ptr [esp + 0x1c]
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   e8????????           |                     

        $sequence_14 = { 50 8d4c246c e8???????? b941000000 33c0 8dbc24ec000000 be???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d4c246c             | lea                 ecx, dword ptr [esp + 0x6c]
            //   e8????????           |                     
            //   b941000000           | mov                 ecx, 0x41
            //   33c0                 | xor                 eax, eax
            //   8dbc24ec000000       | lea                 edi, dword ptr [esp + 0xec]
            //   be????????           |                     

        $sequence_15 = { 57 53 8d4c2424 e8???????? 50 }
            // n = 5, score = 100
            //   57                   | push                edi
            //   53                   | push                ebx
            //   8d4c2424             | lea                 ecx, dword ptr [esp + 0x24]
            //   e8????????           |                     
            //   50                   | push                eax

    condition:
        7 of them and filesize < 57344
}
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