SYMBOLCOMMON_NAMEaka. SYNONYMS
win.amtsol (Back to overview)

AMTsol

aka: Adupihan

Actor(s): PLATINUM


There is no description at this point.

References
2017-06-07MicrosoftMicrosoft Defender ATP Research Team
@online{team:20170607:platinum:38b4122, author = {Microsoft Defender ATP Research Team}, title = {{PLATINUM continues to evolve, find ways to maintain invisibility}}, date = {2017-06-07}, organization = {Microsoft}, url = {https://blogs.technet.microsoft.com/mmpc/2017/06/07/platinum-continues-to-evolve-find-ways-to-maintain-invisibility/}, language = {English}, urldate = {2019-11-25} } PLATINUM continues to evolve, find ways to maintain invisibility
AMTsol
2016-04-26MicrosoftWindows Defender Advanced Threat Hunting Team
@techreport{team:20160426:platinum:6d71086, author = {Windows Defender Advanced Threat Hunting Team}, title = {{PLATINUM Targeted attacks in South and Southeast Asia}}, date = {2016-04-26}, institution = {Microsoft}, url = {http://download.microsoft.com/download/2/2/5/225BFE3E-E1DE-4F5B-A77B-71200928D209/Platinum%20feature%20article%20-%20Targeted%20attacks%20in%20South%20and%20Southeast%20Asia%20April%202016.pdf}, language = {English}, urldate = {2020-01-13} } PLATINUM Targeted attacks in South and Southeast Asia
AMTsol PLATINUM
Yara Rules
[TLP:WHITE] win_amtsol_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_amtsol_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.amtsol"
        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 = { 668901 c3 56 8b742410 85f6 762b 8b4c2408 }
            // n = 7, score = 100
            //   668901               | mov                 word ptr [ecx], ax
            //   c3                   | ret                 
            //   56                   | push                esi
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   85f6                 | test                esi, esi
            //   762b                 | jbe                 0x2d
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]

        $sequence_1 = { e8???????? 83c418 8bc3 5f eb02 33c0 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   8bc3                 | mov                 eax, ebx
            //   5f                   | pop                 edi
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax

        $sequence_2 = { 334df4 83c440 030e 6a06 }
            // n = 4, score = 100
            //   334df4               | xor                 ecx, dword ptr [ebp - 0xc]
            //   83c440               | add                 esp, 0x40
            //   030e                 | add                 ecx, dword ptr [esi]
            //   6a06                 | push                6

        $sequence_3 = { 83be2c03000000 53 756d 8d45f0 50 c645f064 c645f161 }
            // n = 7, score = 100
            //   83be2c03000000       | cmp                 dword ptr [esi + 0x32c], 0
            //   53                   | push                ebx
            //   756d                 | jne                 0x6f
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   c645f064             | mov                 byte ptr [ebp - 0x10], 0x64
            //   c645f161             | mov                 byte ptr [ebp - 0xf], 0x61

        $sequence_4 = { c1f804 5e c20400 56 8bf1 8b06 57 }
            // n = 7, score = 100
            //   c1f804               | sar                 eax, 4
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   57                   | push                edi

        $sequence_5 = { 33db ff75f4 e8???????? 8d4508 50 53 895df4 }
            // n = 7, score = 100
            //   33db                 | xor                 ebx, ebx
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   8d4508               | lea                 eax, [ebp + 8]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx

        $sequence_6 = { 8bf9 2bfe 51 51 57 8bcb }
            // n = 6, score = 100
            //   8bf9                 | mov                 edi, ecx
            //   2bfe                 | sub                 edi, esi
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   57                   | push                edi
            //   8bcb                 | mov                 ecx, ebx

        $sequence_7 = { 57 0fb701 0fb63a 33f8 81e7ff000000 66c1e808 6633047d00d24100 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   0fb701               | movzx               eax, word ptr [ecx]
            //   0fb63a               | movzx               edi, byte ptr [edx]
            //   33f8                 | xor                 edi, eax
            //   81e7ff000000         | and                 edi, 0xff
            //   66c1e808             | shr                 ax, 8
            //   6633047d00d24100     | xor                 ax, word ptr [edi*2 + 0x41d200]

        $sequence_8 = { 46 48 74de ebd4 8bc2 83e203 c1f802 }
            // n = 7, score = 100
            //   46                   | inc                 esi
            //   48                   | dec                 eax
            //   74de                 | je                  0xffffffe0
            //   ebd4                 | jmp                 0xffffffd6
            //   8bc2                 | mov                 eax, edx
            //   83e203               | and                 edx, 3
            //   c1f802               | sar                 eax, 2

        $sequence_9 = { c6451d74 c6451e65 c6451f64 c645203a c6452120 c6452245 }
            // n = 6, score = 100
            //   c6451d74             | mov                 byte ptr [ebp + 0x1d], 0x74
            //   c6451e65             | mov                 byte ptr [ebp + 0x1e], 0x65
            //   c6451f64             | mov                 byte ptr [ebp + 0x1f], 0x64
            //   c645203a             | mov                 byte ptr [ebp + 0x20], 0x3a
            //   c6452120             | mov                 byte ptr [ebp + 0x21], 0x20
            //   c6452245             | mov                 byte ptr [ebp + 0x22], 0x45

    condition:
        7 of them and filesize < 335872
}
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