SYMBOLCOMMON_NAMEaka. SYNONYMS
win.micrass (Back to overview)

Micrass


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References
2016-09-15Palo Alto Networks Unit 42Kaoru Hayashi
@online{hayashi:20160915:mile:302680e, author = {Kaoru Hayashi}, title = {{MILE TEA: Cyber Espionage Campaign Targets Asia Pacific Businesses and Government Agencies}}, date = {2016-09-15}, organization = {Palo Alto Networks Unit 42}, url = {https://researchcenter.paloaltonetworks.com/2016/09/mile-tea-cyber-espionage-campaign-targets-asia-pacific-businesses-and-government-agencies/}, language = {English}, urldate = {2019-12-20} } MILE TEA: Cyber Espionage Campaign Targets Asia Pacific Businesses and Government Agencies
Elirks Logedrut Micrass
Yara Rules
[TLP:WHITE] win_micrass_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_micrass_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.micrass"
        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 = { be???????? bb???????? 6aff ff35???????? ff15???????? 33c0 c705????????01000000 }
            // n = 7, score = 100
            //   be????????           |                     
            //   bb????????           |                     
            //   6aff                 | push                -1
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   c705????????01000000     |     

        $sequence_1 = { 66890c45c4cc4000 40 ebe8 33c0 8945e4 3d01010000 7d0d }
            // n = 7, score = 100
            //   66890c45c4cc4000     | mov                 word ptr [eax*2 + 0x40ccc4], cx
            //   40                   | inc                 eax
            //   ebe8                 | jmp                 0xffffffea
            //   33c0                 | xor                 eax, eax
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   3d01010000           | cmp                 eax, 0x101
            //   7d0d                 | jge                 0xf

        $sequence_2 = { 668b4c4310 66890c45c4cc4000 40 ebe8 }
            // n = 4, score = 100
            //   668b4c4310           | mov                 cx, word ptr [ebx + eax*2 + 0x10]
            //   66890c45c4cc4000     | mov                 word ptr [eax*2 + 0x40ccc4], cx
            //   40                   | inc                 eax
            //   ebe8                 | jmp                 0xffffffea

        $sequence_3 = { c78540ffffff808084a6 c78544ffffff919590b0 c78548ffffff958095f4 c7854cfffffff4f4f4f4 c78550fffffff4f4f4f4 c78554fffffff4f4f4f4 c78558fffffff4f4f4f4 }
            // n = 7, score = 100
            //   c78540ffffff808084a6     | mov    dword ptr [ebp - 0xc0], 0xa6848080
            //   c78544ffffff919590b0     | mov    dword ptr [ebp - 0xbc], 0xb0909591
            //   c78548ffffff958095f4     | mov    dword ptr [ebp - 0xb8], 0xf4958095
            //   c7854cfffffff4f4f4f4     | mov    dword ptr [ebp - 0xb4], 0xf4f4f4f4
            //   c78550fffffff4f4f4f4     | mov    dword ptr [ebp - 0xb0], 0xf4f4f4f4
            //   c78554fffffff4f4f4f4     | mov    dword ptr [ebp - 0xac], 0xf4f4f4f4
            //   c78558fffffff4f4f4f4     | mov    dword ptr [ebp - 0xa8], 0xf4f4f4f4

        $sequence_4 = { 8bd1 c1fa05 c1e006 030495a0dd4000 eb05 b8???????? }
            // n = 6, score = 100
            //   8bd1                 | mov                 edx, ecx
            //   c1fa05               | sar                 edx, 5
            //   c1e006               | shl                 eax, 6
            //   030495a0dd4000       | add                 eax, dword ptr [edx*4 + 0x40dda0]
            //   eb05                 | jmp                 7
            //   b8????????           |                     

        $sequence_5 = { 8b4de4 83c40c 6bc930 8975e0 8db190194000 }
            // n = 5, score = 100
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   83c40c               | add                 esp, 0xc
            //   6bc930               | imul                ecx, ecx, 0x30
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   8db190194000         | lea                 esi, [ecx + 0x401990]

        $sequence_6 = { 75be 8345f808 8932 894a04 83c208 }
            // n = 5, score = 100
            //   75be                 | jne                 0xffffffc0
            //   8345f808             | add                 dword ptr [ebp - 8], 8
            //   8932                 | mov                 dword ptr [edx], esi
            //   894a04               | mov                 dword ptr [edx + 4], ecx
            //   83c208               | add                 edx, 8

        $sequence_7 = { ebcf 8bc6 c1f805 8b0485a0dd4000 83e61f }
            // n = 5, score = 100
            //   ebcf                 | jmp                 0xffffffd1
            //   8bc6                 | mov                 eax, esi
            //   c1f805               | sar                 eax, 5
            //   8b0485a0dd4000       | mov                 eax, dword ptr [eax*4 + 0x40dda0]
            //   83e61f               | and                 esi, 0x1f

        $sequence_8 = { 0fbe80e8014100 83e00f eb02 33c0 0fbe84c108024100 6a07 }
            // n = 6, score = 100
            //   0fbe80e8014100       | movsx               eax, byte ptr [eax + 0x4101e8]
            //   83e00f               | and                 eax, 0xf
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   0fbe84c108024100     | movsx               eax, byte ptr [ecx + eax*8 + 0x410208]
            //   6a07                 | push                7

        $sequence_9 = { 8bcb e8???????? 59 837e4400 57 bf???????? }
            // n = 6, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   837e4400             | cmp                 dword ptr [esi + 0x44], 0
            //   57                   | push                edi
            //   bf????????           |                     

    condition:
        7 of them and filesize < 163840
}
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