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 (20220808 | Detects win.micrass.)
rule win_micrass_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.micrass."
        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.micrass"
        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 = { ff15???????? 85c0 0f84ef000000 395de8 7546 395dec 7541 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f84ef000000         | je                  0xf5
            //   395de8               | cmp                 dword ptr [ebp - 0x18], ebx
            //   7546                 | jne                 0x48
            //   395dec               | cmp                 dword ptr [ebp - 0x14], ebx
            //   7541                 | jne                 0x43

        $sequence_1 = { a1???????? a3???????? 6a0a 59 33c0 bf???????? }
            // n = 6, score = 100
            //   a1????????           |                     
            //   a3????????           |                     
            //   6a0a                 | push                0xa
            //   59                   | pop                 ecx
            //   33c0                 | xor                 eax, eax
            //   bf????????           |                     

        $sequence_2 = { 0fb6c0 eb12 8b45e0 8a807c194000 08443b1d 0fb64601 }
            // n = 6, score = 100
            //   0fb6c0               | movzx               eax, al
            //   eb12                 | jmp                 0x14
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8a807c194000         | mov                 al, byte ptr [eax + 0x40197c]
            //   08443b1d             | or                  byte ptr [ebx + edi + 0x1d], al
            //   0fb64601             | movzx               eax, byte ptr [esi + 1]

        $sequence_3 = { 8b851cfaffff 0fb6840528fdffff 35fd000000 8b8d1cfaffff 88840d28fdffff ebc3 }
            // n = 6, score = 100
            //   8b851cfaffff         | mov                 eax, dword ptr [ebp - 0x5e4]
            //   0fb6840528fdffff     | movzx               eax, byte ptr [ebp + eax - 0x2d8]
            //   35fd000000           | xor                 eax, 0xfd
            //   8b8d1cfaffff         | mov                 ecx, dword ptr [ebp - 0x5e4]
            //   88840d28fdffff       | mov                 byte ptr [ebp + ecx - 0x2d8], al
            //   ebc3                 | jmp                 0xffffffc5

        $sequence_4 = { 57 83e61f 8d3c85a0dd4000 8b07 c1e606 8a4c3004 f6c101 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   83e61f               | and                 esi, 0x1f
            //   8d3c85a0dd4000       | lea                 edi, [eax*4 + 0x40dda0]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   c1e606               | shl                 esi, 6
            //   8a4c3004             | mov                 cl, byte ptr [eax + esi + 4]
            //   f6c101               | test                cl, 1

        $sequence_5 = { 0345e0 8bf9 c1e704 037ddc 33c7 8b7dfc }
            // n = 6, score = 100
            //   0345e0               | add                 eax, dword ptr [ebp - 0x20]
            //   8bf9                 | mov                 edi, ecx
            //   c1e704               | shl                 edi, 4
            //   037ddc               | add                 edi, dword ptr [ebp - 0x24]
            //   33c7                 | xor                 eax, edi
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]

        $sequence_6 = { 50 57 ffd6 391d???????? a3???????? 0f95c0 8b4dfc }
            // n = 7, score = 100
            //   50                   | push                eax
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   391d????????         |                     
            //   a3????????           |                     
            //   0f95c0               | setne               al
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_7 = { 68???????? ffb5b83fffff ff15???????? 8bf0 89b5b43fffff }
            // n = 5, score = 100
            //   68????????           |                     
            //   ffb5b83fffff         | push                dword ptr [ebp - 0xc048]
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   89b5b43fffff         | mov                 dword ptr [ebp - 0xc04c], esi

        $sequence_8 = { 50 c744244801010000 e8???????? 59 50 89442414 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   c744244801010000     | mov                 dword ptr [esp + 0x48], 0x101
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   89442414             | mov                 dword ptr [esp + 0x14], eax

        $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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