SYMBOLCOMMON_NAMEaka. SYNONYMS
win.alma_communicator (Back to overview)

Alma Communicator

Actor(s): OilRig


There is no description at this point.

References
2019-04-16Robert Falcone
@online{falcone:20190416:dns:fed953e, author = {Robert Falcone}, title = {{DNS Tunneling in the Wild: Overview of OilRig’s DNS Tunneling}}, date = {2019-04-16}, url = {https://unit42.paloaltonetworks.com/dns-tunneling-in-the-wild-overview-of-oilrigs-dns-tunneling/}, language = {English}, urldate = {2019-12-03} } DNS Tunneling in the Wild: Overview of OilRig’s DNS Tunneling
BONDUPDATER QUADAGENT Alma Communicator Helminth ISMAgent
2017-11-08Palo Alto Networks Unit 42Robert Falcone
@online{falcone:20171108:oilrig:a8a3089, author = {Robert Falcone}, title = {{OilRig Deploys “ALMA Communicator” – DNS Tunneling Trojan}}, date = {2017-11-08}, organization = {Palo Alto Networks Unit 42}, url = {https://researchcenter.paloaltonetworks.com/2017/11/unit42-oilrig-deploys-alma-communicator-dns-tunneling-trojan/}, language = {English}, urldate = {2019-12-20} } OilRig Deploys “ALMA Communicator” – DNS Tunneling Trojan
Alma Communicator
Yara Rules
[TLP:WHITE] win_alma_communicator_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_alma_communicator_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.alma_communicator"
        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 = { 03c3 50 8d8558fbffff 50 }
            // n = 4, score = 100
            //   03c3                 | add                 eax, ebx
            //   50                   | push                eax
            //   8d8558fbffff         | lea                 eax, [ebp - 0x4a8]
            //   50                   | push                eax

        $sequence_1 = { 4f 8a4701 47 84c0 75f8 8b55f4 }
            // n = 6, score = 100
            //   4f                   | dec                 edi
            //   8a4701               | mov                 al, byte ptr [edi + 1]
            //   47                   | inc                 edi
            //   84c0                 | test                al, al
            //   75f8                 | jne                 0xfffffffa
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]

        $sequence_2 = { 33c9 8bf0 380d???????? 0f95c1 83c102 398d0cf8ffff 7c7e }
            // n = 7, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   8bf0                 | mov                 esi, eax
            //   380d????????         |                     
            //   0f95c1               | setne               cl
            //   83c102               | add                 ecx, 2
            //   398d0cf8ffff         | cmp                 dword ptr [ebp - 0x7f4], ecx
            //   7c7e                 | jl                  0x80

        $sequence_3 = { 663bca 75f5 6a14 8907 8d8558fbffff 53 50 }
            // n = 7, score = 100
            //   663bca               | cmp                 cx, dx
            //   75f5                 | jne                 0xfffffff7
            //   6a14                 | push                0x14
            //   8907                 | mov                 dword ptr [edi], eax
            //   8d8558fbffff         | lea                 eax, [ebp - 0x4a8]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_4 = { 75f8 be???????? 8d85fcfbffff 68ff010000 }
            // n = 4, score = 100
            //   75f8                 | jne                 0xfffffffa
            //   be????????           |                     
            //   8d85fcfbffff         | lea                 eax, [ebp - 0x404]
            //   68ff010000           | push                0x1ff

        $sequence_5 = { 83c8ff eb07 8b04cd5c3f4100 5f }
            // n = 4, score = 100
            //   83c8ff               | or                  eax, 0xffffffff
            //   eb07                 | jmp                 9
            //   8b04cd5c3f4100       | mov                 eax, dword ptr [ecx*8 + 0x413f5c]
            //   5f                   | pop                 edi

        $sequence_6 = { 68???????? 6802000080 8bf9 899df0fdffff c785f4fdffff01000000 ffd6 }
            // n = 6, score = 100
            //   68????????           |                     
            //   6802000080           | push                0x80000002
            //   8bf9                 | mov                 edi, ecx
            //   899df0fdffff         | mov                 dword ptr [ebp - 0x210], ebx
            //   c785f4fdffff01000000     | mov    dword ptr [ebp - 0x20c], 1
            //   ffd6                 | call                esi

        $sequence_7 = { e8???????? 8d85fcfbffff 50 ff15???????? 83f8ff 7404 a810 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d85fcfbffff         | lea                 eax, [ebp - 0x404]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   7404                 | je                  6
            //   a810                 | test                al, 0x10

        $sequence_8 = { 33d2 5e 668b4f02 03fe 663bca 75f5 }
            // n = 6, score = 100
            //   33d2                 | xor                 edx, edx
            //   5e                   | pop                 esi
            //   668b4f02             | mov                 cx, word ptr [edi + 2]
            //   03fe                 | add                 edi, esi
            //   663bca               | cmp                 cx, dx
            //   75f5                 | jne                 0xfffffff7

        $sequence_9 = { 84c0 7536 8b4e08 803939 }
            // n = 4, score = 100
            //   84c0                 | test                al, al
            //   7536                 | jne                 0x38
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]
            //   803939               | cmp                 byte ptr [ecx], 0x39

    condition:
        7 of them and filesize < 245760
}
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