SYMBOLCOMMON_NAMEaka. SYNONYMS
win.artra (Back to overview)

Artra Downloader

Actor(s): Dropping Elephant


There is no description at this point.

References
2020-06-19BitdefenderOana Asoltanei, Denis Cosmin Nutiu, Alin Mihai Barbatei
@techreport{asoltanei:20200619:bitterapt:2e8e1d2, author = {Oana Asoltanei and Denis Cosmin Nutiu and Alin Mihai Barbatei}, title = {{BitterAPT Revisited: the Untold Evolution of an Android Espionage Tool}}, date = {2020-06-19}, institution = {Bitdefender}, url = {https://www.bitdefender.com/files/News/CaseStudies/study/352/Bitdefender-PR-Whitepaper-BitterAPT-creat4571-en-EN-GenericUse.pdf}, language = {English}, urldate = {2020-06-21} } BitterAPT Revisited: the Untold Evolution of an Android Espionage Tool
AndroRAT Artra Downloader Bitter RAT
2019-02-25Palo Alto Networks Unit 42Josh Grunzweig, Brittany Ash
@online{grunzweig:20190225:multiple:5d7b857, author = {Josh Grunzweig and Brittany Ash}, title = {{Multiple ArtraDownloader Variants Used by BITTER to Target Pakistan}}, date = {2019-02-25}, organization = {Palo Alto Networks Unit 42}, url = {https://unit42.paloaltonetworks.com/multiple-artradownloader-variants-used-by-bitter-to-target-pakistan/}, language = {English}, urldate = {2019-12-10} } Multiple ArtraDownloader Variants Used by BITTER to Target Pakistan
Artra Downloader
2018-12-25Tencent腾讯电脑管家
@online{:20181225:bittertapt17:faf6bde, author = {腾讯电脑管家}, title = {{BITTER/T-APT-17 reports on the latest attacks on sensitive agencies such as military, nuclear, and government agencies in China}}, date = {2018-12-25}, organization = {Tencent}, url = {https://www.freebuf.com/articles/database/192726.html}, language = {Chinese}, urldate = {2020-03-02} } BITTER/T-APT-17 reports on the latest attacks on sensitive agencies such as military, nuclear, and government agencies in China
Artra Downloader
2018-11-29360 Threat IntelligenceQi Anxin Threat Intelligence Center
@online{center:20181129:analysis:08c590c, author = {Qi Anxin Threat Intelligence Center}, title = {{Analysis Of Targeted Attack Against Pakistan By Exploiting InPage Vulnerability And Related APT Groups}}, date = {2018-11-29}, organization = {360 Threat Intelligence}, url = {https://ti.360.net/blog/articles/analysis-of-targeted-attack-against-pakistan-by-exploiting-inpage-vulnerability-and-related-apt-groups-english}, language = {English}, urldate = {2020-03-02} } Analysis Of Targeted Attack Against Pakistan By Exploiting InPage Vulnerability And Related APT Groups
Artra Downloader
Yara Rules
[TLP:WHITE] win_artra_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_artra_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.artra"
        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 = { 8b442410 5f 5e 83c41c c21000 5f 33c0 }
            // n = 7, score = 800
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   83c41c               | add                 esp, 0x1c
            //   c21000               | ret                 0x10
            //   5f                   | pop                 edi
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 51 8bc6 57 33c9 }
            // n = 4, score = 700
            //   51                   | push                ecx
            //   8bc6                 | mov                 eax, esi
            //   57                   | push                edi
            //   33c9                 | xor                 ecx, ecx

        $sequence_2 = { 8bc6 41 8d7801 8d9b00000000 8a10 40 }
            // n = 6, score = 700
            //   8bc6                 | mov                 eax, esi
            //   41                   | inc                 ecx
            //   8d7801               | lea                 edi, [eax + 1]
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   40                   | inc                 eax

        $sequence_3 = { 84d2 75f9 2bc7 3bc8 72e3 8bc6 }
            // n = 6, score = 700
            //   84d2                 | test                dl, dl
            //   75f9                 | jne                 0xfffffffb
            //   2bc7                 | sub                 eax, edi
            //   3bc8                 | cmp                 ecx, eax
            //   72e3                 | jb                  0xffffffe5
            //   8bc6                 | mov                 eax, esi

        $sequence_4 = { 57 33c9 8d7801 8da42400000000 }
            // n = 4, score = 700
            //   57                   | push                edi
            //   33c9                 | xor                 ecx, ecx
            //   8d7801               | lea                 edi, [eax + 1]
            //   8da42400000000       | lea                 esp, [esp]

        $sequence_5 = { 72e3 8bc6 8d5001 5f 8a08 }
            // n = 5, score = 700
            //   72e3                 | jb                  0xffffffe5
            //   8bc6                 | mov                 eax, esi
            //   8d5001               | lea                 edx, [eax + 1]
            //   5f                   | pop                 edi
            //   8a08                 | mov                 cl, byte ptr [eax]

        $sequence_6 = { 5f 8a08 40 84c9 75f9 2bc2 880c30 }
            // n = 7, score = 700
            //   5f                   | pop                 edi
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   40                   | inc                 eax
            //   84c9                 | test                cl, cl
            //   75f9                 | jne                 0xfffffffb
            //   2bc2                 | sub                 eax, edx
            //   880c30               | mov                 byte ptr [eax + esi], cl

        $sequence_7 = { 2bc2 03fb 8a4f01 47 84c9 }
            // n = 5, score = 600
            //   2bc2                 | sub                 eax, edx
            //   03fb                 | add                 edi, ebx
            //   8a4f01               | mov                 cl, byte ptr [edi + 1]
            //   47                   | inc                 edi
            //   84c9                 | test                cl, cl

        $sequence_8 = { 8bf8 85ff 0f8488000000 6a00 57 }
            // n = 5, score = 600
            //   8bf8                 | mov                 edi, eax
            //   85ff                 | test                edi, edi
            //   0f8488000000         | je                  0x8e
            //   6a00                 | push                0
            //   57                   | push                edi

        $sequence_9 = { 8b2d???????? 90 8b542410 8d4c2410 51 56 52 }
            // n = 7, score = 600
            //   8b2d????????         |                     
            //   90                   | nop                 
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   51                   | push                ecx
            //   56                   | push                esi
            //   52                   | push                edx

        $sequence_10 = { 6a00 8d442414 50 ffd7 85c0 }
            // n = 5, score = 600
            //   6a00                 | push                0
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax

        $sequence_11 = { 8a08 880a 40 42 84c9 75f6 e8???????? }
            // n = 7, score = 600
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   880a                 | mov                 byte ptr [edx], cl
            //   40                   | inc                 eax
            //   42                   | inc                 edx
            //   84c9                 | test                cl, cl
            //   75f6                 | jne                 0xfffffff8
            //   e8????????           |                     

        $sequence_12 = { 8b1d???????? 55 8b2d???????? 90 }
            // n = 4, score = 600
            //   8b1d????????         |                     
            //   55                   | push                ebp
            //   8b2d????????         |                     
            //   90                   | nop                 

        $sequence_13 = { ffd7 85c0 7445 53 8b1d???????? }
            // n = 5, score = 600
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   7445                 | je                  0x47
            //   53                   | push                ebx
            //   8b1d????????         |                     

        $sequence_14 = { 57 ff15???????? 6a6d 56 ff15???????? 8bf0 e8???????? }
            // n = 7, score = 600
            //   57                   | push                edi
            //   ff15????????         |                     
            //   6a6d                 | push                0x6d
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     

        $sequence_15 = { 6a0a f3a4 6a32 8d8c24ec000000 51 52 e8???????? }
            // n = 7, score = 500
            //   6a0a                 | push                0xa
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   6a32                 | push                0x32
            //   8d8c24ec000000       | lea                 ecx, [esp + 0xec]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_16 = { 33f6 51 8945e8 8975e4 e8???????? 8975fc }
            // n = 6, score = 500
            //   33f6                 | xor                 esi, esi
            //   51                   | push                ecx
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8975e4               | mov                 dword ptr [ebp - 0x1c], esi
            //   e8????????           |                     
            //   8975fc               | mov                 dword ptr [ebp - 4], esi

        $sequence_17 = { 7419 3c26 7515 807c24146c 750e }
            // n = 5, score = 400
            //   7419                 | je                  0x1b
            //   3c26                 | cmp                 al, 0x26
            //   7515                 | jne                 0x17
            //   807c24146c           | cmp                 byte ptr [esp + 0x14], 0x6c
            //   750e                 | jne                 0x10

        $sequence_18 = { 8b0c8de03b4100 c1e006 8d440104 8020fe ff36 e8???????? }
            // n = 6, score = 400
            //   8b0c8de03b4100       | mov                 ecx, dword ptr [ecx*4 + 0x413be0]
            //   c1e006               | shl                 eax, 6
            //   8d440104             | lea                 eax, [ecx + eax + 4]
            //   8020fe               | and                 byte ptr [eax], 0xfe
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     

        $sequence_19 = { 885c2413 bf03000000 eb14 885c2414 bf02000000 eb09 885c2416 }
            // n = 7, score = 400
            //   885c2413             | mov                 byte ptr [esp + 0x13], bl
            //   bf03000000           | mov                 edi, 3
            //   eb14                 | jmp                 0x16
            //   885c2414             | mov                 byte ptr [esp + 0x14], bl
            //   bf02000000           | mov                 edi, 2
            //   eb09                 | jmp                 0xb
            //   885c2416             | mov                 byte ptr [esp + 0x16], bl

        $sequence_20 = { ffd6 85c0 75cc 5d 5b }
            // n = 5, score = 400
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   75cc                 | jne                 0xffffffce
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx

        $sequence_21 = { 59 8b7508 8d34f520104100 391e 7404 }
            // n = 5, score = 400
            //   59                   | pop                 ecx
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   8d34f520104100       | lea                 esi, [esi*8 + 0x411020]
            //   391e                 | cmp                 dword ptr [esi], ebx
            //   7404                 | je                  6

        $sequence_22 = { 2bc2 8b542428 50 68???????? 6a01 6a00 }
            // n = 6, score = 200
            //   2bc2                 | sub                 eax, edx
            //   8b542428             | mov                 edx, dword ptr [esp + 0x28]
            //   50                   | push                eax
            //   68????????           |                     
            //   6a01                 | push                1
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 811008
}
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