SYMBOLCOMMON_NAMEaka. SYNONYMS
win.mechanical (Back to overview)

MECHANICAL

aka: GoldStamp

Actor(s): Kimsuky


There is no description at this point.

References
2020-03-04CrowdStrikeCrowdStrike
@techreport{crowdstrike:20200304:2020:818c85f, author = {CrowdStrike}, title = {{2020 CrowdStrike Global Threat Report}}, date = {2020-03-04}, institution = {CrowdStrike}, url = {https://go.crowdstrike.com/rs/281-OBQ-266/images/Report2020CrowdStrikeGlobalThreatReport.pdf}, language = {English}, urldate = {2020-07-24} } 2020 CrowdStrike Global Threat Report
MESSAGETAP More_eggs 8.t Dropper Anchor BabyShark BadNews Clop Cobalt Strike CobInt Cobra Carbon System Cutwail DanaBot Dharma DoppelDridex DoppelPaymer Dridex Emotet FlawedAmmyy FriedEx Gandcrab Get2 IcedID ISFB KerrDown LightNeuron LockerGoga Maze MECHANICAL Necurs Nokki Outlook Backdoor Phobos Predator The Thief QakBot REvil RobinHood Ryuk SDBbot Skipper SmokeLoader TerraRecon TerraStealer TerraTV TinyLoader TrickBot Vidar Winnti ANTHROPOID SPIDER APT23 APT31 APT39 APT40 BlackTech BuhTrap Charming Kitten CLOCKWORK SPIDER DOPPEL SPIDER FIN7 Gamaredon Group GOBLIN PANDA MONTY SPIDER MUSTANG PANDA NARWHAL SPIDER NOCTURNAL SPIDER PINCHY SPIDER SALTY SPIDER SCULLY SPIDER SMOKY SPIDER Thrip VENOM SPIDER VICEROY TIGER
2018-12-05NetScoutASERT Team
@online{team:20181205:stolen:bc9dd60, author = {ASERT Team}, title = {{STOLEN PENCIL Campaign Targets Academia}}, date = {2018-12-05}, organization = {NetScout}, url = {https://asert.arbornetworks.com/stolen-pencil-campaign-targets-academia/}, language = {English}, urldate = {2020-01-08} } STOLEN PENCIL Campaign Targets Academia
GREASE MECHANICAL
Yara Rules
[TLP:WHITE] win_mechanical_auto (20220808 | Detects win.mechanical.)
rule win_mechanical_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.mechanical."
        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.mechanical"
        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 = { 03c7 3bca 72ed 5f }
            // n = 4, score = 200
            //   03c7                 | add                 eax, edi
            //   3bca                 | cmp                 ecx, edx
            //   72ed                 | jb                  0xffffffef
            //   5f                   | pop                 edi

        $sequence_1 = { 488bce 488d540464 666690 0fb6840c7f010000 }
            // n = 4, score = 200
            //   488bce               | xor                 edx, edx
            //   488d540464           | inc                 ecx
            //   666690               | mov                 eax, 0x103
            //   0fb6840c7f010000     | inc                 esp

        $sequence_2 = { 488d542420 b904010000 ff15???????? 488d4c2420 }
            // n = 4, score = 200
            //   488d542420           | dec                 eax
            //   b904010000           | lea                 edx, [esp + 0x20]
            //   ff15????????         |                     
            //   488d4c2420           | mov                 ecx, 0x104

        $sequence_3 = { 030495c0e54200 eb05 b8???????? f6400420 }
            // n = 4, score = 200
            //   030495c0e54200       | add                 eax, dword ptr [edx*4 + 0x42e5c0]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6400420             | test                byte ptr [eax + 4], 0x20

        $sequence_4 = { 0401 3cbe 8844240b 76e2 }
            // n = 4, score = 200
            //   0401                 | add                 al, 1
            //   3cbe                 | cmp                 al, 0xbe
            //   8844240b             | mov                 byte ptr [esp + 0xb], al
            //   76e2                 | jbe                 0xffffffe4

        $sequence_5 = { 03c1 1bc9 0bc1 59 e9???????? e8???????? ff742404 }
            // n = 7, score = 200
            //   03c1                 | add                 eax, ecx
            //   1bc9                 | sbb                 ecx, ecx
            //   0bc1                 | or                  eax, ecx
            //   59                   | pop                 ecx
            //   e9????????           |                     
            //   e8????????           |                     
            //   ff742404             | push                dword ptr [esp + 4]

        $sequence_6 = { 033485c0e54200 8b45e4 8b00 8906 }
            // n = 4, score = 200
            //   033485c0e54200       | add                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_7 = { 8903 0f840c910000 8b442430 488d8c2481450000 33d2 41b803010000 4488a42480450000 }
            // n = 7, score = 200
            //   8903                 | dec                 eax
            //   0f840c910000         | lea                 edx, [esp + 0x6d0]
            //   8b442430             | dec                 eax
            //   488d8c2481450000     | mov                 ecx, edi
            //   33d2                 | test                eax, eax
            //   41b803010000         | inc                 ecx
            //   4488a42480450000     | mov                 eax, 0x103

        $sequence_8 = { 41b803010000 4488a424f03b0000 488905???????? e8???????? 4c8d1da59a0100 }
            // n = 5, score = 200
            //   41b803010000         | add                 edx, 1
            //   4488a424f03b0000     | test                al, al
            //   488905????????       |                     
            //   e8????????           |                     
            //   4c8d1da59a0100       | je                  0xb

        $sequence_9 = { 4c8d1d2b400200 498bcc 498bd3 0fb602 4883c201 84c0 7409 }
            // n = 7, score = 200
            //   4c8d1d2b400200       | dec                 eax
            //   498bcc               | lea                 ecx, [esp + 0x20]
            //   498bd3               | dec                 esp
            //   0fb602               | lea                 ebx, [0x2402b]
            //   4883c201             | dec                 ecx
            //   84c0                 | mov                 ecx, esp
            //   7409                 | dec                 ecx

        $sequence_10 = { 6690 410fb6440bff 4883e901 88840cb0260000 75ed 488d8c24b0260000 4d8bc4 }
            // n = 7, score = 200
            //   6690                 | mov                 byte ptr [esp + 0x4580], ah
            //   410fb6440bff         | inc                 ebp
            //   4883e901             | test                eax, eax
            //   88840cb0260000       | je                  0x1d6
            //   75ed                 | dec                 eax
            //   488d8c24b0260000     | lea                 edx, [esp + 0x5bd0]
            //   4d8bc4               | inc                 ebp

        $sequence_11 = { 00686c 42 0023 d18a0688078a }
            // n = 4, score = 200
            //   00686c               | add                 byte ptr [eax + 0x6c], ch
            //   42                   | inc                 edx
            //   0023                 | add                 byte ptr [ebx], ah
            //   d18a0688078a         | ror                 dword ptr [edx - 0x75f877fa], 1

        $sequence_12 = { 488d9424d0060000 488bcf ff15???????? 85c0 }
            // n = 4, score = 200
            //   488d9424d0060000     | mov                 edx, ebx
            //   488bcf               | movzx               eax, byte ptr [edx]
            //   ff15????????         |                     
            //   85c0                 | dec                 eax

        $sequence_13 = { 4585c0 0f84d0010000 488d9424d05b0000 458bc8 66666690 }
            // n = 5, score = 200
            //   4585c0               | inc                 esp
            //   0f84d0010000         | mov                 byte ptr [esp + 0x3bf0], ah
            //   488d9424d05b0000     | dec                 esp
            //   458bc8               | lea                 ebx, [0x19aa5]
            //   66666690             | mov                 dword ptr [ebx], eax

        $sequence_14 = { 03ce c6840c3801000000 8d8424a05c0000 33f6 }
            // n = 4, score = 200
            //   03ce                 | add                 ecx, esi
            //   c6840c3801000000     | mov                 byte ptr [esp + ecx + 0x138], 0
            //   8d8424a05c0000       | lea                 eax, [esp + 0x5ca0]
            //   33f6                 | xor                 esi, esi

        $sequence_15 = { 033485c0e54200 c745e401000000 33db 395e08 }
            // n = 4, score = 200
            //   033485c0e54200       | add                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   c745e401000000       | mov                 dword ptr [ebp - 0x1c], 1
            //   33db                 | xor                 ebx, ebx
            //   395e08               | cmp                 dword ptr [esi + 8], ebx

    condition:
        7 of them and filesize < 434176
}
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