SYMBOLCOMMON_NAMEaka. SYNONYMS
win.jaku (Back to overview)

Jaku

aka: C3PRO-RACOON, EQUINOX, KCNA Infostealer, Reconcyc

Actor(s): DarkHotel


There is no description at this point.

References
2022-05-05BrightTALK (Mandiant)Christopher Gardner
@online{gardner:20220505:sample:66178f9, author = {Christopher Gardner}, title = {{The Sample: Beating the Malware Piñata}}, date = {2022-05-05}, organization = {BrightTALK (Mandiant)}, url = {https://www.brighttalk.com/webcast/7451/538775}, language = {English}, urldate = {2022-06-09} } The Sample: Beating the Malware Piñata
Jaku
2018-06-17IBMIBM Support
@online{support:20180617:storwize:8759428, author = {IBM Support}, title = {{Storwize USB Initialization Tool may contain malicious code}}, date = {2018-06-17}, organization = {IBM}, url = {https://www-01.ibm.com/support/docview.wss?uid=ssg1S1010146}, language = {English}, urldate = {2020-01-07} } Storwize USB Initialization Tool may contain malicious code
Jaku
2016ForcepointAndy Settle, Bapadittya Dey, Nicholas Griffin, Abel Toro
@techreport{settle:2016:analysis:8117245, author = {Andy Settle and Bapadittya Dey and Nicholas Griffin and Abel Toro}, title = {{Analysis of a Botnet Campaign}}, date = {2016}, institution = {Forcepoint}, url = {https://www.forcepoint.com/sites/default/files/resources/files/report_jaku_analysis_of_botnet_campaign_en_0.pdf}, language = {English}, urldate = {2020-01-06} } Analysis of a Botnet Campaign
Jaku
2015-03-04Kaspersky LabsKurt Baumgartner, Juan Andrés Guerrero-Saade
@online{baumgartner:20150304:whos:0b8331c, author = {Kurt Baumgartner and Juan Andrés Guerrero-Saade}, title = {{Who’s Really Spreading through the Bright Star?}}, date = {2015-03-04}, organization = {Kaspersky Labs}, url = {https://securelist.com/whos-really-spreading-through-the-bright-star/68978/}, language = {English}, urldate = {2019-12-20} } Who’s Really Spreading through the Bright Star?
Jaku
Yara Rules
[TLP:WHITE] win_jaku_auto (20230125 | Detects win.jaku.)
rule win_jaku_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.jaku."
        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.jaku"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 51 e8???????? 83c40c f6461102 7414 ff75f0 }
            // n = 6, score = 1500
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   f6461102             | test                byte ptr [esi + 0x11], 2
            //   7414                 | je                  0x16
            //   ff75f0               | push                dword ptr [ebp - 0x10]

        $sequence_1 = { 234634 8b4e40 8b5644 668b6e6c }
            // n = 4, score = 1500
            //   234634               | and                 eax, dword ptr [esi + 0x34]
            //   8b4e40               | mov                 ecx, dword ptr [esi + 0x40]
            //   8b5644               | mov                 edx, dword ptr [esi + 0x44]
            //   668b6e6c             | mov                 bp, word ptr [esi + 0x6c]

        $sequence_2 = { 83c438 84c0 743d 8b45ec 3b450c 741c }
            // n = 6, score = 1500
            //   83c438               | add                 esp, 0x38
            //   84c0                 | test                al, al
            //   743d                 | je                  0x3f
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]
            //   741c                 | je                  0x1e

        $sequence_3 = { 7614 8b550c 0fb702 66ff4445a8 42 8d4c45a8 42 }
            // n = 7, score = 1500
            //   7614                 | jbe                 0x16
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   0fb702               | movzx               eax, word ptr [edx]
            //   66ff4445a8           | inc                 word ptr [ebp + eax*2 - 0x58]
            //   42                   | inc                 edx
            //   8d4c45a8             | lea                 ecx, [ebp + eax*2 - 0x58]
            //   42                   | inc                 edx

        $sequence_4 = { 53 e8???????? 2bf8 83c410 85ff 7fd7 5b }
            // n = 7, score = 1500
            //   53                   | push                ebx
            //   e8????????           |                     
            //   2bf8                 | sub                 edi, eax
            //   83c410               | add                 esp, 0x10
            //   85ff                 | test                edi, edi
            //   7fd7                 | jg                  0xffffffd9
            //   5b                   | pop                 ebx

        $sequence_5 = { 397508 8975ec c645f025 c645f252 }
            // n = 4, score = 1500
            //   397508               | cmp                 dword ptr [ebp + 8], esi
            //   8975ec               | mov                 dword ptr [ebp - 0x14], esi
            //   c645f025             | mov                 byte ptr [ebp - 0x10], 0x25
            //   c645f252             | mov                 byte ptr [ebp - 0xe], 0x52

        $sequence_6 = { 8b4e40 894dd0 894df0 3b4dec }
            // n = 4, score = 1500
            //   8b4e40               | mov                 ecx, dword ptr [esi + 0x40]
            //   894dd0               | mov                 dword ptr [ebp - 0x30], ecx
            //   894df0               | mov                 dword ptr [ebp - 0x10], ecx
            //   3b4dec               | cmp                 ecx, dword ptr [ebp - 0x14]

        $sequence_7 = { 894d1c 8acb 2a4dfc 884d11 8b4d1c 668b11 0fb7ca }
            // n = 7, score = 1500
            //   894d1c               | mov                 dword ptr [ebp + 0x1c], ecx
            //   8acb                 | mov                 cl, bl
            //   2a4dfc               | sub                 cl, byte ptr [ebp - 4]
            //   884d11               | mov                 byte ptr [ebp + 0x11], cl
            //   8b4d1c               | mov                 ecx, dword ptr [ebp + 0x1c]
            //   668b11               | mov                 dx, word ptr [ecx]
            //   0fb7ca               | movzx               ecx, dx

        $sequence_8 = { 68???????? ff15???????? c3 b8???????? e8???????? 83ec2c }
            // n = 6, score = 800
            //   68????????           |                     
            //   ff15????????         |                     
            //   c3                   | ret                 
            //   b8????????           |                     
            //   e8????????           |                     
            //   83ec2c               | sub                 esp, 0x2c

        $sequence_9 = { ff742408 e8???????? c20800 8bc1 }
            // n = 4, score = 600
            //   ff742408             | push                dword ptr [esp + 8]
            //   e8????????           |                     
            //   c20800               | ret                 8
            //   8bc1                 | mov                 eax, ecx

        $sequence_10 = { 7507 b800308000 eb02 33c0 }
            // n = 4, score = 500
            //   7507                 | jne                 9
            //   b800308000           | mov                 eax, 0x803000
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax

        $sequence_11 = { 53 68000000a0 6a03 53 }
            // n = 4, score = 500
            //   53                   | push                ebx
            //   68000000a0           | push                0xa0000000
            //   6a03                 | push                3
            //   53                   | push                ebx

        $sequence_12 = { 6a01 03c3 68???????? 50 e8???????? 83c40c 85c0 }
            // n = 7, score = 500
            //   6a01                 | push                1
            //   03c3                 | add                 eax, ebx
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_13 = { 7508 83c8ff e9???????? 8b839f830000 }
            // n = 4, score = 500
            //   7508                 | jne                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   8b839f830000         | mov                 eax, dword ptr [ebx + 0x839f]

        $sequence_14 = { 5b c3 55 8bec 833d????????00 53 56 }
            // n = 7, score = 500
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   833d????????00       |                     
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_15 = { 75dd 57 e8???????? 59 }
            // n = 4, score = 500
            //   75dd                 | jne                 0xffffffdf
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_16 = { 55 56 57 6880020000 }
            // n = 4, score = 500
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   6880020000           | push                0x280

        $sequence_17 = { e8???????? 59 eb57 53 }
            // n = 4, score = 400
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   eb57                 | jmp                 0x59
            //   53                   | push                ebx

        $sequence_18 = { 0245fd 3245fe 8a4dff d2c8 }
            // n = 4, score = 400
            //   0245fd               | add                 al, byte ptr [ebp - 3]
            //   3245fe               | xor                 al, byte ptr [ebp - 2]
            //   8a4dff               | mov                 cl, byte ptr [ebp - 1]
            //   d2c8                 | ror                 al, cl

        $sequence_19 = { 016c242c 8b44242c 5f 5e 5d }
            // n = 5, score = 400
            //   016c242c             | add                 dword ptr [esp + 0x2c], ebp
            //   8b44242c             | mov                 eax, dword ptr [esp + 0x2c]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_20 = { 56 e8???????? 59 8b4620 }
            // n = 4, score = 400
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]

        $sequence_21 = { 50 e8???????? 59 8b4e2c }
            // n = 4, score = 400
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b4e2c               | mov                 ecx, dword ptr [esi + 0x2c]

        $sequence_22 = { 85f6 0f849d000000 8d54241c 8d442420 52 6a04 }
            // n = 6, score = 400
            //   85f6                 | test                esi, esi
            //   0f849d000000         | je                  0xa3
            //   8d54241c             | lea                 edx, [esp + 0x1c]
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   52                   | push                edx
            //   6a04                 | push                4

        $sequence_23 = { 40 99 2bc2 d1f8 ff45fc 6689864d720000 668b01 }
            // n = 7, score = 300
            //   40                   | inc                 eax
            //   99                   | cdq                 
            //   2bc2                 | sub                 eax, edx
            //   d1f8                 | sar                 eax, 1
            //   ff45fc               | inc                 dword ptr [ebp - 4]
            //   6689864d720000       | mov                 word ptr [esi + 0x724d], ax
            //   668b01               | mov                 ax, word ptr [ecx]

        $sequence_24 = { 85c0 7539 ff15???????? 3d882f0000 }
            // n = 4, score = 300
            //   85c0                 | test                eax, eax
            //   7539                 | jne                 0x3b
            //   ff15????????         |                     
            //   3d882f0000           | cmp                 eax, 0x2f88

        $sequence_25 = { 56 57 8965f0 8b7d24 33db 895dfc }
            // n = 6, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   8965f0               | mov                 dword ptr [ebp - 0x10], esp
            //   8b7d24               | mov                 edi, dword ptr [ebp + 0x24]
            //   33db                 | xor                 ebx, ebx
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx

        $sequence_26 = { 0fb79e73830000 eb15 e8???????? 660145fc 0fb745fc }
            // n = 5, score = 300
            //   0fb79e73830000       | movzx               ebx, word ptr [esi + 0x8373]
            //   eb15                 | jmp                 0x17
            //   e8????????           |                     
            //   660145fc             | add                 word ptr [ebp - 4], ax
            //   0fb745fc             | movzx               eax, word ptr [ebp - 4]

        $sequence_27 = { 59 ff431c 66c74310a401 833d????????00 7512 ff05???????? }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   ff431c               | inc                 dword ptr [ebx + 0x1c]
            //   66c74310a401         | mov                 word ptr [ebx + 0x10], 0x1a4
            //   833d????????00       |                     
            //   7512                 | jne                 0x14
            //   ff05????????         |                     

        $sequence_28 = { 6a00 53 e8???????? 83c40c 33d2 8bc3 }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   33d2                 | xor                 edx, edx
            //   8bc3                 | mov                 eax, ebx

    condition:
        7 of them and filesize < 2220032
}
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