Ransom.BAT.TARGETCOMP.THBBGBC

 Analysis by: Jayvee Mark Villaroman

 ALIASES:

Trojan:Script/Wacatac.B!ml (MICROSOFT), Trojan.BAT.Obfus.i (KASPERSKY)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

1,312,943 bytes

File Type:

BAT

Memory Resident:

Yes

Initial Samples Received Date:

06 Mar 2023

Payload:

Drops files, Connects to URLs/IPs, Collects system information, Steals information, Disables AV, Terminates processes

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Ransomware drops the following files:

  • %User Temp%\xl1ynand.thf.ps1
  • %User Temp%\wemuhj25.xp2.psm1
  • %AppDataLocal%\Microsoft\Windows\PowerShell\ModuleAnalysisCache
  • %User Temp%\Bwmeldokiller.bat
  • %User Temp%\cydurk4o.fpq.ps1
  • %User Temp%\jkixckve.qvo.psm1
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • attrib +s +h "%User Temp%\{random strings}.tmp\{file name}.bat".exe
  • %User Temp%\{random strings}.tmp\{file name}.bat".exe -wIn 1 -enC {encrypted command}
  • "%System%\WindowsPowerShell\v1.0\powershell.exe" -ENC {encrypted command} ← start-sleep -seconds 20
  • %User Temp%\Bwmeldokiller.bat
  • %Windows%\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  • cmd.exe /c bcdedit /set {current} bootstatuspolicy ignoreallfailures
  • %Windows%\sysnative\vssadmin.exe delete shadows /all /quiet
  • cmd.exe /c bcdedit /set {current} recoveryenabled no

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It creates the following folders:

  • %User Temp%\{random strings}.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Ransomware modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\Terminal Services
MaxConnectionTime = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\Terminal Services
MaxDisconnectionTime = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\Terminal Services
MaxIdleTime = 0

Propagation

This Ransomware uses the following file names for the copies it drops into shared networks:

  • mallox.exe

Process Termination

This Ransomware terminates the following services if found on the affected system:

  • 360EntPGSvc
  • ABBYY.Licensing.FineReader.Professional.12.0
  • AdobeARMservice
  • AgentX
  • AGSService
  • Alibaba Security Aegis Detect Service
  • Alibaba Security Aegis Update Service
  • AliyunService
  • AngelOfDeath
  • Apache2.2
  • Apache2.4
  • Apple Mobile Device Service
  • AutoUpdatePatchService
  • AutoUpdateService
  • Bonjour Service
  • CASLicenceServer
  • CASMsgSrv
  • CASVirtualDiskService
  • CASWebServer
  • CASXMLService
  • cbVSCService
  • ceng_web_svc_d
  • ClickToRunSvc
  • CobianBackup10
  • d_safe
  • DDNSService
  • DDVRulesProcessor
  • Dell Hardware Support
  • DellDRLogSvc
  • DFServ
  • DGPNPSEV
  • EvtSys
  • FileZilla Server
  • FirebirdGuardianDeafaultInstance
  • FirebirdServerDefaultInstance
  • GNWebService
  • HaoZipSvc
  • igfxCUIService2.0.0.0
  • ImtsEventSvr
  • iNethinkSQLBackupSvc
  • IngressMgr
  • JWEM3DBAUTORun
  • JWRinfoClientService
  • JWService
  • K3ClouManager
  • K3MMainSuspendService
  • K3MobileServiceManage
  • KpService
  • KugouService
  • memcached Server
  • MSComplianceAudit
  • MsDtsServer100
  • MsDtsServer130
  • MSExchangeADTopology
  • MSExchangeAntispamUpdate
  • MSExchangeCompliance
  • MSExchangeDagMgmt
  • MSExchangeDelivery
  • MSExchangeDiagnostics
  • MSExchangeEdgeSync
  • MSExchangeFastSearch
  • MSExchangeFrontEndTransport
  • MSExchangeHM
  • MSExchangeHMRecovery
  • MSExchangeImap4
  • MSExchangeIMAP4BE
  • MSExchangeIS
  • MSExchangeMailboxAssistants
  • MSExchangeMailboxReplication
  • MSExchangeNotificationsBroker
  • MSExchangePop3
  • MSExchangePOP3BE
  • MSExchangeRepl
  • MSExchangeRPC
  • MSExchangeServiceHost
  • MSExchangeSubmission
  • MSExchangeThrottling
  • MSExchangeTransport
  • MSExchangeTransportLogSearch
  • MSExchangeUM
  • MSExchangeUMCR
  • msftesql$SQLEXPRESS
  • MSOLAP$SHOPCONTROL9
  • MSSQL
  • MSSQL$FE_EXPRESS
  • MSSQL$OPTIMA
  • MSSQL$PROGID
  • MSSQL$SHOPCONTROL9
  • MSSQL$SQL2008
  • MSSQL$VEEAMSQL2012
  • MSSQL$WOLTERSKLUWER
  • MSSQLFDLauncher
  • MSSQLFDLauncher$OPTIMA
  • MSSQLFDLauncher$SHOPCONTROL9
  • MSSQLServerADHelper100
  • MSSQLServerOLAPService
  • Mysoft.SchedulingService
  • MySQL
  • MySQL5_OA
  • mysqltransport
  • NetBackup Client Service
  • NetBackup Discovery Framework
  • NetBackup Legacy Client Service
  • NetBackup Legacy Network Service
  • NetBackup Proxy Service
  • NetBackup SAN Client Fibre Transport Service
  • NetVault Process Manager
  • NFLicenceServer
  • NFOTPService
  • NFSysService
  • NFVPrintServer
  • OMAILREPORT
  • OracleDBConsoleilas
  • OracleOraDb10g_homeliSQL*Plus
  • pcas
  • postgresql-x64-9.4
  • QPCore
  • RapidRecoveryAgent
  • RapService
  • RavService
  • RavTask
  • Realtek11nSU
  • ReportServer
  • ReportServer$OPTIMA
  • ReportServer$SHOPCONTROL9
  • RTCAVMCU
  • SAP Business One RSP Agent Service
  • SAPB1iDIProxy
  • SAPB1iDIProxy_Monitor
  • SAPB1iEventSender
  • SBOClientAgent
  • SBODI_Server
  • SBOJobServiceBackEnd
  • SBOMail
  • SBOWFDataAccess
  • SBOWorkflowEngine
  • SentinelKeysServer
  • Service2
  • ServiceMid
  • SQLAgent
  • SQLAgent$OPTIMA
  • SQLAgent$PROGID
  • SQLAgent$SHOPCONTROL9
  • SQLAgent$VEEAMSQL2012
  • SQLAgent$WOLTERSKLUWER
  • SQLBackupAndFTP Client Service
  • SQLBrowser
  • SQLSERVERAGENT
  • SQLTELEMETRY
  • SQLTELEMETRY$HL
  • SQLWrite
  • SSISTELEMETRY130
  • SupportAssistAgent
  • Synology Drive VSS Service x64
  • TeamViewer
  • TeamViewer8
  • TMBMServer
  • tmlisten
  • Tomcat8
  • TPlusStdAppService1220
  • TPlusStdAppService1300
  • TPlusStdTaskService1220
  • TPlusStdTaskService1300
  • TPlusStdUpgradeService1220
  • TPlusStdUpgradeService1300
  • TPlusStdWebService1300
  • TurboCRM70
  • U8DispatchService
  • U8EISService
  • U8EncryptService
  • U8GCService
  • U8KeyManagePool
  • U8MPool
  • U8SCMPool
  • U8SendMailAdmin
  • U8SLReportService
  • U8TaskService
  • U8WebPool
  • U8WorkerService1
  • U8WorkerService2
  • UFAllNet
  • UFIDAWebService
  • UFNet
  • UFReportService
  • UIODetect
  • UTUService
  • VeeamBrokerSvc
  • VeeamCatalogSvc
  • VeeamCloudSvc
  • VeeamDeploySvc
  • VeeamDistributionSvc
  • VeeamMountSvc
  • VeeamNFSSvc
  • VeeamTransportSvc
  • VeeanBackupSvc
  • VMAuthdService
  • VMnetDHCP
  • VMUSBArbService
  • VMware NAT Service
  • VMwareHostd
  • wanxiao-monitor
  • WebAttendServer
  • xenlite
  • XenSvc

It terminates the following processes if found running in the affected system's memory:

  • cbInterface.exe
  • cbService.exe
  • cbVSCService11.exe
  • Cobian.exe
  • DataCollectorSvc.exe
  • dbsrv12.exe
  • DDSoftPwsTomcat9.exe
  • EdgeTransport.exe
  • EXCEL.EXE
  • fdhost.exe
  • fdlauncher.exe
  • FileZilla Server.exe
  • Kingdee.K3.CRM.MMC.AutoService.exe
  • Launchpad.exe
  • licenceserver.exe
  • MessageNotification.exe
  • Microsoft.Exchange.AddressBook.Service.exe
  • Microsoft.Exchange.AntispamUpdateSvc.exe
  • Microsoft.Exchange.ContentFilter.Wrapper.exe
  • Microsoft.Exchange.EdgeSyncSvc.exe
  • Microsoft.Exchange.ProtectedServiceHost.exe
  • Microsoft.Exchange.RpcClientAccess.Service.exe
  • Microsoft.Exchange.Search.ExSearch.exe
  • Microsoft.Exchange.ServiceHost.exe
  • Microsoft.SqlServer.IntegrationServices.MasterServiceHost.exe
  • mpdwsvc.exe
  • MsDtsSrvr.exe
  • MsExchangeFDS.exe
  • MSExchangeMailboxAssistants.exe
  • MSExchangeMailboxReplication.exe
  • MSExchangeMailSubmission.exe
  • msexchangerepl.exe
  • MSExchangeThrottling.exe
  • MSExchangeTransport.exe
  • MSExchangeTransportLogSearch.exe
  • msmdsrv.exe
  • mysql.exe
  • mysqld-nt.exe
  • mysqld.exe
  • NFVPrint.exe
  • OneDrive.exe
  • OUTLOOK.EXE
  • pvxcom.exe
  • pvxiosvr.exe
  • pvxwin32.exe
  • pvxwin64.exe
  • ReportingServicesService.exe
  • Sage.NA.AT_AU.Service.exe
  • Sage.NA.AT_AU.SysTray.exe
  • SageCSClient.exe
  • SAP Business One.exe
  • ServerNT.exe
  • sqlagentc.exe
  • SqlBak.Service.exe
  • sqlbrowser.exe
  • sqlceip.exe
  • SqlManagement.exe
  • sqlservr.exe
  • sqlwriter.exe
  • Ssms.exe
  • store.exe
  • TaskService.exe
  • Tomcat7w.exe
  • tomcat9.exe
  • TongBackupSrv.exe
  • U8CEServer.exe
  • U8SmartClient.exe
  • U8SmartClientMonitor.exe
  • UFMsgCenterService.exe
  • UFSoft.U8.OC.QuartzScheduler.exe
  • Veeam.Backup.Agent.ConfigurationService.exe
  • Veeam.Backup.BrokerService.exe
  • Veeam.Backup.CatalogDataService.exe
  • Veeam.Backup.CloudService.exe
  • Veeam.Backup.Manager.exe
  • Veeam.Backup.MountService.exe
  • Veeam.Backup.Service.exe
  • Veeam.Backup.WmiServer.exe
  • Veeam.Guest.Interaction.Proxy.exe
  • VeeamDeploymentSvc.exe
  • VeeamNFSSvc.exe
  • VeeamTransportSvc.exe
  • w3wp.exe
  • WINWORD.EXE
  • wsusservice.exe

Download Routine

This Ransomware connects to the following URL(s) to download its component file(s):

  • https://{BLOCKED}s.io/QWEwqdsvsf/ap.php

Information Theft

This Ransomware gathers the following data:

  • Machine ID
  • OS Version
  • System Locale
  • IP Address

Other Details

This Ransomware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
Wpad = 0a-00-27-00-00-00

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
Wpad = {GUID}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\ESS\//./root
CIMV2 = SCM Event Provider

It connects to the following URL(s) to get the affected system's IP address:

  • http://{BLOCKED}ify.org

It does the following:

  • It stops and deletes the following services if found on the affected system's memory:
    • 2345PicSvc
    • 360EntClientSvc
    • 360EntHttpServer
    • 360EntSvc
    • abs_deployer
    • ADWS
    • AHS SERVICE
    • AlibabaProtect
    • allpass_redisservice_port21160
    • apachezt
    • AppFabricCachingService
    • asComSvc
    • aspnet_state
    • BackupExecAgentAccelerator
    • BackupExecAgentBrowser
    • BackupExecDeviceMediaService
    • BackupExecJobEngine
    • BackupExecManagementService
    • BackupExecRPCService
    • bedbg
    • BestSyncSvc
    • btPanel
    • c2wts
    • CASLicenceServer
    • cbVSCService11
    • CIS
    • CloudExchangeService
    • CobianBackup10
    • CobianBackup11
    • Daemon Service
    • DAService_TCP
    • EASService
    • EasyFZS Server
    • eCard-TTransServer
    • eCardMPService
    • edr_monitor
    • EnergyDataService
    • ErpEnvSvc
    • eSightService
    • Flash Helper Service
    • FlexNet Licensing Service 64
    • FontCache3.0.0.0
    • FTA
    • ftnlses3
    • ftnlsv3
    • ftusbrdsrv
    • ftusbrdwks
    • FxService
    • Gailun_Downloader
    • GPSDaemon
    • GPSDataProcSvr
    • GPSDownSvr
    • GPSFtpd
    • GPSGatewaySvr
    • GPSLoginSvr
    • GPSMediaSvr
    • GPSMysqld
    • GPSStorageSvr
    • GPSTomcat6
    • GPSUserSvr
    • ImeDictUpdateService
    • IpOverUsbSvc
    • Jenkins
    • jhi_service
    • JhTask
    • K3MobileService
    • kbasesrv
    • KICkSvr
    • Kiwi Syslog Server
    • KMSELDI
    • KuaiYunTools
    • LMS
    • LPManager
    • MASTER
    • MCService
    • MDM
    • MediatekRegistryWriter
    • MMRHookService
    • MotionBoard57
    • MotionBoardRCService57
    • MSCRMAsyncService
    • MSCRMAsyncService$maintenance
    • MSCRMUnzipService
    • MSDTC
    • MsDtsServer100
    • msftesql
    • MSMQ
    • MSSEARCH
    • MSSQL$SQL2008
    • MSSQLFDLauncher
    • MSSQLSERVER
    • MSSQLServerOLAPService
    • Mysoft.Autoupgrade.DispatchService
    • Mysoft.Autoupgrade.UpdateService
    • Mysoft.Config.WindowsService
    • Mysoft.DataCenterService
    • Mysoft.SchedulingService
    • Mysoft.Setup.InstallService
    • MysoftUpdate
    • NFWebServer
    • NscAuthService
    • Nuo Update Monitor
    • OfficeClearCache
    • OfficeUpdateService
    • OpenFastAssist
    • OpenSSHd
    • OracleDBConcoleorcl
    • OracleJobSchedulerORCL
    • OracleMTSRecoveryService
    • OracleOraDb11g_home1ClrAgent
    • OracleOraDb11g_home1TNSListener
    • OracleRemExecService
    • OracleServiceORCL
    • OracleVssWriterORCL
    • OSearch16
    • OSP Service
    • ProjectCalcService16
    • ProjectEventService16
    • ProjectQueueService16
    • Protect_2345Explorer
    • QcSoftService
    • qemu-ga
    • QQCertificateService
    • RaAutoInstSrv_RT2870
    • RabbitMQ
    • Redis
    • RemoteAssistService
    • REPLICA
    • ReportServer
    • ReportServer$SQLEXPRESS
    • Rpc Monitor
    • RTCASMCU
    • RTCATS
    • RTCAVMCU
    • RTCCDR
    • RTCDATAMCU
    • RTCIMMCU
    • RTCMEETINGMCU
    • RtcQms
    • RtcSrv
    • savsvc
    • secbizsrv
    • semwebsrv
    • Sense Shield Service
    • Serv-U
    • ShareBoxMonitorService
    • ShareBoxService
    • SiebelApplicationContainer_Siebel_Home_d_Siebel_sai
    • smtpsvrJT
    • SPAdminV4
    • SPSearchHostController
    • SPTimerV4
    • SPTraceV4
    • SQL Server Reporting Services
    • SQLAgent$SQL2008
    • SQLANYs_sem5
    • SQLBrowser
    • SQLSERVERAGENT
    • SQLService
    • SQLTELEMETRY
    • SQLWriter
    • SSMonitorService
    • SSSyncService
    • SyncBASE Service
    • TbossSystem
    • TCPIDDAService
    • TeamViewer
    • TongBackupSrv
    • TPlusStdAppService1300
    • TPlusStdTaskService1300
    • TPlusStdUpgradeService1300
    • TurboCRM70
    • TxQBService
    • U8DispatchService
    • U8EISService
    • U8EncryptService
    • U8GCService
    • U8KeyManagePool
    • U8MPool
    • U8SCMPool
    • U8SLReportService
    • U8SmsSrv
    • U8TaskService
    • U8WebPool
    • U8WorkerService1
    • U8WorkerService2
    • UFAllNet
    • UFReportService
    • UI0Detect
    • UIODetect
    • UtilDev Web Server Pro
    • UTUService
    • UWS HiPriv Services
    • UWS LoPriv Services
    • VGAuthService
    • VirboxWebServer
    • VisualSVNServer
    • vm-agent
    • VmAgentDaemon
    • VMAuthdService
    • VMTools
    • VMUSBArbService
    • vmware-converter-agent
    • vmware-converter-server
    • vmware-converter-worker
    • VMwareHostd
    • vsvnjobsvc
    • wampapache
    • wanxiao-monitor
    • WebAttendServer
    • wwbizsrv
    • XT800Service_Personal
    • YunService
    • Zabbix Agent
    • ZTE FileTranS
    • ZTE USBIP Client
    • ZTE USBIP Client Guard
    • ZTEVdservice
    • zyb_sync

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .xollam

It drops the following file(s) as ransom note:

  • {Affected directories}\FILE RECOVERY.txt
    Ransom Note

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.296.03

FIRST VSAPI PATTERN DATE:

06 Mar 2023

VSAPI OPR PATTERN File:

18.297.00

VSAPI OPR PATTERN Date:

07 Mar 2023

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • Wpad = 0a-00-27-00-00-00
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • Wpad = {GUID}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\ESS\//./root
    • CIMV2 = SCM Event Provider

Step 4

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services
    • MaxConnectionTime = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services
    • MaxDisconnectionTime = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services
    • MaxIdleTime = 0

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\{random strings}.tmp

Step 6

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\xl1ynand.thf.ps1
  • %User Temp%\wemuhj25.xp2.psm1
  • %AppDataLocal%\Microsoft\Windows\PowerShell\ModuleAnalysisCache
  • %User Temp%\Bwmeldokiller.bat
  • %User Temp%\cydurk4o.fpq.ps1
  • %User Temp%\jkixckve.qvo.psm1
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
  • %System Root%\FILE RECOVERY.txt
  • {Shared network drives}\mallox.exe

Step 7

Scan your computer with your Trend Micro product to delete files detected as Ransom.BAT.TARGETCOMP.THBBGBC. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:

Step 8

Restore encrypted files from backup.


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