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 (20220808 | Detects win.alma_communicator.)
rule win_alma_communicator_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.alma_communicator."
        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.alma_communicator"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { a2???????? eb52 803d????????00 7449 6a02 5b ff36 }
            // n = 7, score = 100
            //   a2????????           |                     
            //   eb52                 | jmp                 0x54
            //   803d????????00       |                     
            //   7449                 | je                  0x4b
            //   6a02                 | push                2
            //   5b                   | pop                 ebx
            //   ff36                 | push                dword ptr [esi]

        $sequence_1 = { 8d95fcfdffff 8901 8bf2 66a1???????? 66894104 8a02 }
            // n = 6, score = 100
            //   8d95fcfdffff         | lea                 edx, [ebp - 0x204]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8bf2                 | mov                 esi, edx
            //   66a1????????         |                     
            //   66894104             | mov                 word ptr [ecx + 4], ax
            //   8a02                 | mov                 al, byte ptr [edx]

        $sequence_2 = { a0???????? 884102 8d442428 50 8d84246c010000 }
            // n = 5, score = 100
            //   a0????????           |                     
            //   884102               | mov                 byte ptr [ecx + 2], al
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   50                   | push                eax
            //   8d84246c010000       | lea                 eax, [esp + 0x16c]

        $sequence_3 = { 6bd030 895de4 8b049df08f4100 8945d4 8955e8 8a5c1029 }
            // n = 6, score = 100
            //   6bd030               | imul                edx, eax, 0x30
            //   895de4               | mov                 dword ptr [ebp - 0x1c], ebx
            //   8b049df08f4100       | mov                 eax, dword ptr [ebx*4 + 0x418ff0]
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   8955e8               | mov                 dword ptr [ebp - 0x18], edx
            //   8a5c1029             | mov                 bl, byte ptr [eax + edx + 0x29]

        $sequence_4 = { ffb5d0fbffff ff15???????? ebb1 8bb5c8fbffff 8bce }
            // n = 5, score = 100
            //   ffb5d0fbffff         | push                dword ptr [ebp - 0x430]
            //   ff15????????         |                     
            //   ebb1                 | jmp                 0xffffffb3
            //   8bb5c8fbffff         | mov                 esi, dword ptr [ebp - 0x438]
            //   8bce                 | mov                 ecx, esi

        $sequence_5 = { 0f8c92fdffff 6aff 6a01 8d85a0e9ffff 50 6820030000 }
            // n = 6, score = 100
            //   0f8c92fdffff         | jl                  0xfffffd98
            //   6aff                 | push                -1
            //   6a01                 | push                1
            //   8d85a0e9ffff         | lea                 eax, [ebp - 0x1660]
            //   50                   | push                eax
            //   6820030000           | push                0x320

        $sequence_6 = { 75f5 be???????? a5 a5 66a5 }
            // n = 5, score = 100
            //   75f5                 | jne                 0xfffffff7
            //   be????????           |                     
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   66a5                 | movsw               word ptr es:[edi], word ptr [esi]

        $sequence_7 = { 2bd1 8a01 88040a 41 84c0 75f6 8365dc00 }
            // n = 7, score = 100
            //   2bd1                 | sub                 edx, ecx
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   88040a               | mov                 byte ptr [edx + ecx], al
            //   41                   | inc                 ecx
            //   84c0                 | test                al, al
            //   75f6                 | jne                 0xfffffff8
            //   8365dc00             | and                 dword ptr [ebp - 0x24], 0

        $sequence_8 = { 3c2f 7572 88443df8 47 41 }
            // n = 5, score = 100
            //   3c2f                 | cmp                 al, 0x2f
            //   7572                 | jne                 0x74
            //   88443df8             | mov                 byte ptr [ebp + edi - 8], al
            //   47                   | inc                 edi
            //   41                   | inc                 ecx

        $sequence_9 = { e8???????? e8???????? ffb508f8ffff e8???????? }
            // n = 4, score = 100
            //   e8????????           |                     
            //   e8????????           |                     
            //   ffb508f8ffff         | push                dword ptr [ebp - 0x7f8]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 245760
}
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