SYMBOLCOMMON_NAMEaka. SYNONYMS
win.xagent (Back to overview)

X-Agent

aka: splm, chopstick

Actor(s): Sofacy


There is no description at this point.

References
2020-07-29Kaspersky LabsGReAT
@online{great:20200729:trends:6810325, author = {GReAT}, title = {{APT trends report Q2 2020}}, date = {2020-07-29}, organization = {Kaspersky Labs}, url = {https://securelist.com/apt-trends-report-q2-2020/97937/}, language = {English}, urldate = {2020-07-30} } APT trends report Q2 2020
PhantomLance Dacls Penquin Turla elf.wellmess AppleJeus Dacls AcidBox Cobalt Strike Dacls EternalPetya Godlike12 Olympic Destroyer PlugX shadowhammer ShadowPad Sinowal VHD Ransomware Volgmer WellMess X-Agent XTunnel
2020-02-13QianxinQi Anxin Threat Intelligence Center
@techreport{center:20200213:report:146d333, author = {Qi Anxin Threat Intelligence Center}, title = {{APT Report 2019}}, date = {2020-02-13}, institution = {Qianxin}, url = {https://ti.qianxin.com/uploads/2020/02/13/cb78386a082f465f259b37dae5df4884.pdf}, language = {English}, urldate = {2020-02-27} } APT Report 2019
Chrysaor Exodus Dacls VPNFilter DNSRat Griffon KopiLuwak More_eggs SQLRat AppleJeus BONDUPDATER Agent.BTZ Anchor AndroMut AppleJeus BOOSTWRITE Brambul Carbanak Cobalt Strike Dacls DistTrack DNSpionage Dtrack ELECTRICFISH FlawedAmmyy FlawedGrace Get2 Grateful POS HOPLIGHT Imminent Monitor RAT jason Joanap KerrDown KEYMARBLE Lambert LightNeuron LoJax MiniDuke PolyglotDuke PowerRatankba Rising Sun SDBbot ServHelper Snatch Stuxnet TinyMet tRat TrickBot Volgmer X-Agent Zebrocy
2020SecureworksSecureWorks
@online{secureworks:2020:iron:48c68a0, author = {SecureWorks}, title = {{IRON TWILIGHT}}, date = {2020}, organization = {Secureworks}, url = {https://www.secureworks.com/research/threat-profiles/iron-twilight}, language = {English}, urldate = {2020-05-23} } IRON TWILIGHT
X-Agent X-Agent X-Agent Computrace HideDRV Sedreco Seduploader X-Agent XTunnel Zebrocy Zebrocy (AutoIT)
2018-10-04NCSC UKNCSC UK
@techreport{uk:20181004:indicators:af0d14a, author = {NCSC UK}, title = {{Indicators of Compromise for Malware used by APT28}}, date = {2018-10-04}, institution = {NCSC UK}, url = {https://www.thecssc.com/wp-content/uploads/2018/10/4OctoberIOC-APT28-malware-advisory.pdf}, language = {English}, urldate = {2019-11-29} } Indicators of Compromise for Malware used by APT28
X-Agent
2018-10-04SymantecCritical Attack Discovery and Intelligence Team
@online{team:20181004:apt28:97a1356, author = {Critical Attack Discovery and Intelligence Team}, title = {{APT28: New Espionage Operations Target Military and Government Organizations}}, date = {2018-10-04}, organization = {Symantec}, url = {https://symantec-blogs.broadcom.com/blogs/election-security/apt28-espionage-military-government}, language = {English}, urldate = {2020-04-21} } APT28: New Espionage Operations Target Military and Government Organizations
LoJax Seduploader X-Agent XTunnel Zebrocy APT28
2017-12-21ESET ResearchESET Research
@online{research:20171221:sednit:630ff7c, author = {ESET Research}, title = {{Sednit update: How Fancy Bear Spent the Year}}, date = {2017-12-21}, organization = {ESET Research}, url = {https://www.welivesecurity.com/2017/12/21/sednit-update-fancy-bear-spent-year/}, language = {English}, urldate = {2019-11-14} } Sednit update: How Fancy Bear Spent the Year
Seduploader X-Agent
2017-02-20Contagio DumpMila Parkour
@online{parkour:20170220:part:c54b5de, author = {Mila Parkour}, title = {{Part I. Russian APT - APT28 collection of samples including OSX XAgent}}, date = {2017-02-20}, organization = {Contagio Dump}, url = {https://contagiodump.blogspot.de/2017/02/russian-apt-apt28-collection-of-samples.html}, language = {English}, urldate = {2019-11-26} } Part I. Russian APT - APT28 collection of samples including OSX XAgent
X-Agent Komplex Coreshell Downdelph HideDRV SEADADDY Sedreco Seduploader X-Agent XTunnel
2017-01-10FireEyeFireEye iSIGHT Intelligence
@techreport{intelligence:20170110:apt28:2f371ee, author = {FireEye iSIGHT Intelligence}, title = {{APT28: At The Center Of The Storm}}, date = {2017-01-10}, institution = {FireEye}, url = {https://www.mandiant.com/sites/default/files/2021-09/APT28-Center-of-Storm-2017.pdf}, language = {English}, urldate = {2022-05-04} } APT28: At The Center Of The Storm
Coreshell OLDBAIT Sedreco Seduploader X-Agent
2016-10-20ESET ResearchESET Research
@techreport{research:20161020:en:e2e6603, author = {ESET Research}, title = {{En Route with Sednit Part 2: Observing the Comings and Goings}}, date = {2016-10-20}, institution = {ESET Research}, url = {http://www.welivesecurity.com/wp-content/uploads/2016/10/eset-sednit-part-2.pdf}, language = {English}, urldate = {2019-10-25} } En Route with Sednit Part 2: Observing the Comings and Goings
X-Agent Sedreco X-Agent XTunnel
2016-06-15CrowdStrikeDmitri Alperovitch
@online{alperovitch:20160615:bears:604c1d9, author = {Dmitri Alperovitch}, title = {{Bears in the Midst: Intrusion into the Democratic National Committee}}, date = {2016-06-15}, organization = {CrowdStrike}, url = {https://www.crowdstrike.com/blog/bears-midst-intrusion-democratic-national-committee/}, language = {English}, urldate = {2022-03-14} } Bears in the Midst: Intrusion into the Democratic National Committee
X-Agent ATI-Agent SEADADDY Seduploader X-Agent XTunnel APT28
2015-12-04Kaspersky LabsGReAT
@online{great:20151204:sofacy:b437b35, author = {GReAT}, title = {{Sofacy APT hits high profile targets with updated toolset}}, date = {2015-12-04}, organization = {Kaspersky Labs}, url = {https://securelist.com/sofacy-apt-hits-high-profile-targets-with-updated-toolset/72924/}, language = {English}, urldate = {2020-08-30} } Sofacy APT hits high profile targets with updated toolset
Coreshell Sedreco Seduploader X-Agent APT28
2014-09-05GoogleNeel Mehta, Billy Leonard, Shane Huntiey
@techreport{mehta:20140905:peering:8ce5720, author = {Neel Mehta and Billy Leonard and Shane Huntiey}, title = {{Peering Into the Aquarium: Analysis of a Sophisticated Multi-Stage Malware Family}}, date = {2014-09-05}, institution = {Google}, url = {https://assets.documentcloud.org/documents/3461560/Google-Aquarium-Clean.pdf}, language = {English}, urldate = {2020-07-30} } Peering Into the Aquarium: Analysis of a Sophisticated Multi-Stage Malware Family
X-Agent
2014FireEyeFireEye
@techreport{fireeye:2014:apt28:27799d1, author = {FireEye}, title = {{APT28}}, date = {2014}, institution = {FireEye}, url = {http://www2.fireeye.com/rs/fireye/images/rpt-apt28.pdf}, language = {English}, urldate = {2020-01-08} } APT28
Coreshell Sedreco X-Agent
Yara Rules
[TLP:WHITE] win_xagent_auto (20221125 | Detects win.xagent.)
rule win_xagent_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.xagent."
        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.xagent"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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???????? 8bd8 e8???????? 03d8 }
            // n = 4, score = 3100
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   e8????????           |                     
            //   03d8                 | add                 ebx, eax

        $sequence_1 = { c1ea02 6bd20d b801000000 2bc2 }
            // n = 4, score = 3100
            //   c1ea02               | shr                 edx, 2
            //   6bd20d               | imul                edx, edx, 0xd
            //   b801000000           | mov                 eax, 1
            //   2bc2                 | sub                 eax, edx

        $sequence_2 = { 8b0488 8b4e10 85c9 7423 8b7e08 ff460c }
            // n = 6, score = 2600
            //   8b0488               | mov                 eax, dword ptr [eax + ecx*4]
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   85c9                 | test                ecx, ecx
            //   7423                 | je                  0x25
            //   8b7e08               | mov                 edi, dword ptr [esi + 8]
            //   ff460c               | inc                 dword ptr [esi + 0xc]

        $sequence_3 = { 49 894e10 7507 c7460c00000000 5f }
            // n = 5, score = 2600
            //   49                   | dec                 ecx
            //   894e10               | mov                 dword ptr [esi + 0x10], ecx
            //   7507                 | jne                 9
            //   c7460c00000000       | mov                 dword ptr [esi + 0xc], 0
            //   5f                   | pop                 edi

        $sequence_4 = { 8b4604 85c0 7407 8b4d08 8b11 }
            // n = 5, score = 2600
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b11                 | mov                 edx, dword ptr [ecx]

        $sequence_5 = { 8bc1 57 8b7a08 c1e802 }
            // n = 4, score = 2600
            //   8bc1                 | mov                 eax, ecx
            //   57                   | push                edi
            //   8b7a08               | mov                 edi, dword ptr [edx + 8]
            //   c1e802               | shr                 eax, 2

        $sequence_6 = { 5d c20400 8d4de4 e8???????? b8???????? }
            // n = 5, score = 2600
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   e8????????           |                     
            //   b8????????           |                     

        $sequence_7 = { eb02 8b11 8b4808 8bc1 57 }
            // n = 5, score = 2600
            //   eb02                 | jmp                 4
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   8b4808               | mov                 ecx, dword ptr [eax + 8]
            //   8bc1                 | mov                 eax, ecx
            //   57                   | push                edi

        $sequence_8 = { ff460c 03ff 03ff 3b7e0c 7707 }
            // n = 5, score = 2600
            //   ff460c               | inc                 dword ptr [esi + 0xc]
            //   03ff                 | add                 edi, edi
            //   03ff                 | add                 edi, edi
            //   3b7e0c               | cmp                 edi, dword ptr [esi + 0xc]
            //   7707                 | ja                  9

        $sequence_9 = { 8bce e8???????? 8b08 85c9 7504 }
            // n = 5, score = 2600
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   85c9                 | test                ecx, ecx
            //   7504                 | jne                 6

        $sequence_10 = { 740c 488b07 4c8b13 488903 4c8917 488b13 488b0e }
            // n = 7, score = 1500
            //   740c                 | je                  0xe
            //   488b07               | dec                 eax
            //   4c8b13               | mov                 eax, dword ptr [edi]
            //   488903               | dec                 eax
            //   4c8917               | mov                 ecx, dword ptr [ebx]
            //   488b13               | dec                 eax
            //   488b0e               | mov                 dword ptr [ebx], eax

        $sequence_11 = { e8???????? 48833b00 740a 488b4308 }
            // n = 4, score = 1500
            //   e8????????           |                     
            //   48833b00             | test                al, al
            //   740a                 | je                  0xe
            //   488b4308             | dec                 eax

        $sequence_12 = { 84c0 740c 488b07 488b0b 488903 }
            // n = 5, score = 1500
            //   84c0                 | mov                 ecx, ebx
            //   740c                 | nop                 
            //   488b07               | test                al, al
            //   488b0b               | je                  0xe
            //   488903               | dec                 eax

        $sequence_13 = { e8???????? 488b4328 4c8bcf 4c8bc6 }
            // n = 4, score = 1500
            //   e8????????           |                     
            //   488b4328             | dec                 eax
            //   4c8bcf               | mov                 dword ptr [edi], ecx
            //   4c8bc6               | je                  0xe

        $sequence_14 = { e8???????? 488d542458 488bcb e8???????? 90 }
            // n = 5, score = 1500
            //   e8????????           |                     
            //   488d542458           | dec                 eax
            //   488bcb               | lea                 edx, [esp + 0x58]
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_15 = { 4889442420 41b904000000 4533c0 ff15???????? }
            // n = 4, score = 1500
            //   4889442420           | xor                 al, al
            //   41b904000000         | cmp                 al, 1
            //   4533c0               | mov                 edx, 0x1f4
            //   ff15????????         |                     

        $sequence_16 = { e8???????? 90 0fb705???????? 6689442420 }
            // n = 4, score = 1500
            //   e8????????           |                     
            //   90                   | mov                 ecx, edi
            //   0fb705????????       |                     
            //   6689442420           | dec                 esp

        $sequence_17 = { ff15???????? baf4010000 488bcb ff15???????? }
            // n = 4, score = 600
            //   ff15????????         |                     
            //   baf4010000           | jne                 6
            //   488bcb               | mov                 al, 1
            //   ff15????????         |                     

        $sequence_18 = { b803b57ea5 f7e6 c1ea06 6bd263 }
            // n = 4, score = 500
            //   b803b57ea5           | jmp                 6
            //   f7e6                 | xor                 al, al
            //   c1ea06               | cmp                 al, 1
            //   6bd263               | jne                 6

        $sequence_19 = { c1ea07 69d295000000 2bca 8bd1 }
            // n = 4, score = 400
            //   c1ea07               | xor                 al, al
            //   69d295000000         | cmp                 al, 1
            //   2bca                 | jne                 6
            //   8bd1                 | mov                 al, 1

        $sequence_20 = { 75f8 488bf9 482bfe 2bfb }
            // n = 4, score = 200
            //   75f8                 | mov                 eax, ebx
            //   488bf9               | dec                 eax
            //   482bfe               | mov                 edx, esi
            //   2bfb                 | jne                 0xfffffffa

        $sequence_21 = { 75f8 488bf9 482bfb 448bcf }
            // n = 4, score = 200
            //   75f8                 | shr                 edx, 6
            //   488bf9               | imul                edx, edx, 0x63
            //   482bfb               | mov                 edx, 0x1f4
            //   448bcf               | dec                 eax

        $sequence_22 = { 75f8 488bf9 482bfa 4c8bc7 }
            // n = 4, score = 200
            //   75f8                 | xor                 al, al
            //   488bf9               | cmp                 al, 1
            //   482bfa               | mov                 al, 1
            //   4c8bc7               | jmp                 4

        $sequence_23 = { 75f8 488bf8 482bf9 4803cf 4c8bc3 488bd6 e8???????? }
            // n = 7, score = 200
            //   75f8                 | jmp                 6
            //   488bf8               | xor                 al, al
            //   482bf9               | cmp                 al, 1
            //   4803cf               | jne                 6
            //   4c8bc3               | mov                 al, 1
            //   488bd6               | jmp                 6
            //   e8????????           |                     

        $sequence_24 = { 75f8 488bf8 482bfa 488b4b28 }
            // n = 4, score = 200
            //   75f8                 | xor                 al, al
            //   488bf8               | cmp                 al, 1
            //   482bfa               | jne                 6
            //   488b4b28             | mov                 al, 1

    condition:
        7 of them and filesize < 729088
}
[TLP:WHITE] win_xagent_w0   (20170517 | Sofacy Group Malware Sample 3)
rule win_xagent_w0 {
    meta:
        description = "Sofacy Group Malware Sample 3"
        author = "Florian Roth"
        reference = "http://dokumente.linksfraktion.de/inhalt/report-orig.pdf"
        date = "2015-06-19"
        hash = "5f6b2a0d1d966fc4f1ed292b46240767f4acb06c13512b0061b434ae2a692fa1"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/sofacy_xtunnel_bundestag.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xagent"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $s1 = "shell\\open\\command=\"System Volume Information\\USBGuard.exe\" install" fullword ascii 
        $s2 = ".?AVAgentModuleRemoteKeyLogger@@" fullword ascii 
        $s3 = "<font size=4 color=red>process isn't exist</font>" fullword ascii 
        $s4 = "<font size=4 color=red>process is exist</font>" fullword ascii 
        $s5 = ".winnt.check-fix.com" fullword ascii 
        $s6 = ".update.adobeincorp.com" fullword ascii 
        $s7 = ".microsoft.checkwinframe.com" fullword ascii
        $s8 = "adobeincorp.com" fullword wide 
        $s9 = "# EXC: HttpSender - Cannot create Get Channel!" fullword ascii 

        $x1 = "User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:20.0) Gecko/20100101 Firefox/" wide 
        $x2 = "User-Agent: Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/2" wide 
        $x3 = "C:\\Windows\\System32\\cmd.exe" fullword wide 
    condition:
        uint16(0) == 0x5a4d and filesize < 300KB and (
            2 of ($s*) or 
            ( 1 of ($s*) and all of ($x*) )
        ) 
}
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