1. Symantec/
  2. Security Response/
  3. Ransom.Sorebrect

Ransom.Sorebrect

Risk Level 1: Very Low

Discovered:
June 19, 2017
Updated:
June 27, 2017 4:33:59 PM
Type:
Trojan
Infection Length:
Varies
Systems Affected:
Windows
Once executed the Trojan connects to the following remote location to get the IP address of the compromised computer:
  • ipinfo.io

Next, the Trojan creates a new svchost.exe process, injects itself into that process, then deletes itself.

The Trojan then creates the following file:
  • [PATH TO ENCRYPTED FILES]\!!! READ THIS - IMPORTANT !!!.txt

The Trojan creates the following registry entries in order to display a message to the user before they log in to the compromised computer:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\"LegalNoticeCaption" = "Microsoft Windows Security Center"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\"LegalNoticeText" = "Dear Owner. Bad news: your server was hacked. For more information and recommendations, write to our experts by e-mail. When you start Windows, Windows Defender works to help protect your PC by scanning for malicious or unwanted software."

The Trojan displays a message before the user logs in, informing them that the computer has been compromised.



The Trojan uses Tor to connect to the following remote location:
  • kzg2xa3nsydva3p2.onion/gate.php

The Trojan attempts to delete the following directory:
  • %SystemDrive%\$RECYCLE.BIN

Next, the Trojan stops the following services:
  • AcrSch2Svc
  • AcrSch2Svc
  • Acronis VSS Provider
  • AcronisAgent
  • AcronisAgent
  • AcronisFS
  • AcronisPXE
  • AdobeARMservice
  • Altaro.Agent.exe
  • Altaro.HyperV.WAN.RemoteService.exe
  • Altaro.SubAgent.exe
  • Altaro.UI.Service.exe
  • Apache2.2
  • Apache2.4
  • BackupExecAgentAccelerator
  • BackupExecAgentAccelerator
  • BackupExecAgentBrowser
  • BackupExecAgentBrowser
  • BackupExecDeviceMediaService
  • BackupExecDeviceMediaService
  • BackupExecJobEngine
  • BackupExecManagementService
  • BackupExecRPCService
  • BackupExecRPCService
  • Browser
  • CertPropSvc
  • CertSvc
  • CobianBackup11
  • CobianBackup11
  • ComarchAutomatSynchronizacji
  • ComarchML
  • ComarchUpdateAgentService
  • CrashPlanService
  • DLOAdminSvcu
  • DLOMaintenanceSvc
  • DataCollectorSvc
  • DbxSvc
  • DomainManagerProviderSvc
  • EDBSRVR
  • FBSServer
  • FBSWorker
  • FirebirdGuardianDefaultInstance
  • FirebirdServerDefaultInstance
  • GenetecSecurityCenterMobileServer
  • GenetecServer
  • GenetecWatchdog
  • KAORCMP999467066507407
  • LMIRfsDriver
  • LogisticsServicesHost800
  • MELCS
  • MEMTAS
  • MEPOCS
  • MEPOPS
  • MESMTPCS
  • MICROMD72ONCOEMR
  • MSExchangeADTopology
  • MSExchangeADTopology
  • MSExchangeADTopology
  • MSExchangeAntispamUpdate
  • MSExchangeAntispamUpdate
  • MSExchangeEdgeSync
  • MSExchangeEdgeSync
  • MSExchangeFBA
  • MSExchangeFDS
  • MSExchangeFDS
  • MSExchangeIS
  • MSExchangeIS
  • MSExchangeImap4
  • MSExchangeImap4
  • MSExchangeMailSubmission
  • MSExchangeMailSubmission
  • MSExchangeMailboxAssistants
  • MSExchangeMailboxAssistants
  • MSExchangeMonitoring
  • MSExchangeMonitoring
  • MSExchangePop3
  • MSExchangePop3
  • MSExchangeRep
  • MSExchangeRepl
  • MSExchangeRepl
  • MSExchangeSA
  • MSExchangeSA
  • MSExchangeSearch
  • MSExchangeSearch
  • MSExchangeServiceHost
  • MSExchangeServiceHost
  • MSExchangeTransport
  • MSExchangeTransport
  • MSExchangeTransportLogSearch
  • MSExchangeTransportLogSearch
  • MSSQL$ACRONIS
  • MSSQL$ACRONIS
  • MSSQL$BKUPEXEC
  • MSSQL$MICROSOFT##SSEE
  • MSSQL$MICROSOFT##SSEE
  • MSSQL$MICROSOFT##WID
  • MSSQL$MICROSOFT##WID
  • MSSQL$PROBA
  • MSSQL$SBSMONITORING
  • MSSQL$SBSMONITORING
  • MSSQL$SHAREPOINT
  • MSSQL$SQL2005
  • MSSQL$SQLEXPRESS
  • MSSQL$SQLEXPRESS
  • MSSQL$VEEAMSQL2008R2
  • MSSQLFDLauncher
  • MSSQLFDLauncher
  • MSSQLFDLauncher$PROBA
  • MSSQLFDLauncher$SBSMONITORING
  • MSSQLFDLauncher$SHAREPOINT
  • MSSQLSERVER
  • MSSQLSERVER
  • MSSQLSERVR
  • MSSQLServerADHelper
  • MSSQLServerADHelper100
  • MSSQLServerADHelper100
  • MSSQLServerADHelper100
  • MSSQLServerOLAPService
  • MSSQLServerOLAPService
  • MicroMD AutoDeploy
  • MicroMD Connection Service
  • MsDtsServer
  • MsDtsServer100
  • MsDtsServer100
  • MySQL
  • MySQL56
  • NAVSERVER
  • ONCOEMR2MICROMD7
  • PRIMAVERAWindowsService
  • PleskControlPanel
  • PleskSQLServer
  • PleskSQLServer
  • PopPassD
  • PrimaveraWS800
  • PrimaveraWS900
  • QBCFMonitorService
  • QBFCService
  • QBVSS
  • QuickBooksDB23
  • QuickBooksDB25
  • RBMS_OptimaBI
  • RBSS_OptimaBI
  • RemoteSystemMonitorService
  • ReportServer
  • SBOClientAgent
  • SPAdminV4
  • SPSearch4
  • SPTimerV3
  • SPTrace
  • SPTraceV4
  • SPWriter
  • SPWriterV4
  • SQLAgent$PROBA
  • SQLAgent$SBSMONITORING
  • SQLAgent$SHAREPOINT
  • SQLAgent$SQLEXPRESS
  • SQLAgent$SQLEXPRESS
  • SQLAgent$VEEAMSQL2008R2
  • SQLBrowser
  • SQLBrowser
  • SQLBrowser
  • SQLBrowser
  • SQLBrowser
  • SQLSERVERAGENT
  • SQLSERVERAGENT
  • SQLWriter
  • SQLWriter
  • SQLWriter
  • SQLWriter
  • SQLWriter
  • ServerService
  • ShadowProtectSvc
  • ShadowProtectSvc
  • StorageNode
  • TTESCheduleServer800
  • TeamViewer
  • VSNAPVSS
  • VSNAPVSS
  • Veeam Backup Catalog Data Service
  • Veeam Backup and Replication Service
  • VeeamCatalogSvc
  • VeeamCloudSvc
  • VeeamDeploymentService
  • VeeamMountSvc
  • VeeamNFSSvc
  • VeeamTransportSvc
  • W32Time
  • W3SVC
  • WSS_ComputerBackupProviderSvc
  • WSS_ComputerBackupSvc
  • WSearch
  • WinVNC4
  • WseComputerBackupSvc
  • WseEmailSvc
  • WseHealthSvc
  • WseMediaSvc
  • WseMgmtSvc
  • WseNtfSvc
  • WseStorageSvc
  • ZWCService
  • bedbg
  • bedbg
  • cbVSCService11
  • cbVSCService11
  • dashboardMD Sync
  • dbupdate
  • dbupdatem
  • eXchange POP3 6.0
  • memcached Server
  • msftesql$SBSMONITORING
  • msftesql$SBSMONITORING
  • msftesql-Exchange
  • msftesql-Exchange
  • msftesql-Exchange
  • plesksrv
  • postgresql-8.4
  • postgresql-9.5
  • sesvc
  • spiceworks
  • stc_raw_agent
  • swprv
  • vmicvss
  • wsbexchange
  • wsbexchange
  • zBackupAssistService

The Trojan then encrypts files on the compromised computer.

The Trojan does not encrypt files in the following locations:
  • %Windir%
  • %SystemDrive%\Documents and Settings\All Users\Desktop

Note: Files in these locations may be encrypted on compromised computers running Windows XP.

The Trojan does not encrypt files with the following extensions:
  • .exe
  • .dll
  • .lnk
  • .sys

The Trojan appends the following string to the end of encrypted file names:
  • .aes_ni_0day

Next, the Trojan drops the following file in every location where files have been encrypted:
  • [PATH TO ENCRYPTED FILES]\!!! READ THIS - IMPORTANT !!!.txt

The .txt file is a ransom note demanding payment for the files to be decrypted.

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Mark Anthony Balanza
Summary| Technical Details| Removal

Search Threats

Search by name
Example: W32.Beagle.AG@mm
STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
  • Twitter
  • Facebook
  • LinkedIn
  • Google+
  • YouTube