Analysis by: Marvelous Pelin

 ALIASES:

Ransom.AESNI(Malwarebytes)

 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: Downloaded from the Internet, Dropped by other malware

This malware is a variant of the SOREBRECT malware that Trend Micro discovered on June 2017. It sports fileless, code-injecting capabilities. Users affected by this malware may find their critical documents and files encrypted and rendered useless.

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 connects to certain websites to send and receive information. It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 31,232 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 19 Apr 2017
Payload: Encrypts files

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:

  • {folder of encrypted files}\!!! READ THIS - IMPORTANT !!!.txt - ransom note

It adds the following processes:

  • svchost.exe

It injects codes into the following process(es):

  • svchost.exe - added process

File Infection

This Ransomware avoids infecting folders containing the following strings:

  • Windows
  • Desktop

Other Details

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

  • ipinfo.io

It connects to the following website to send and receive information:

  • {BLOCKED}3nsydva3p2.onion/gate.php

It renames encrypted files using the following names:

  • {original filename and extension}.aes_ni_0day

It does the following:

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

It deletes itself after execution.

NOTES:
The ransom note contains the following:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.332.08
FIRST VSAPI PATTERN DATE: 10 Apr 2017
VSAPI OPR PATTERN File: 13.333.00
VSAPI OPR PATTERN Date: 11 Apr 2017

Step 1

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.  
  • {folder of encrypted files}\!!! READ THIS - IMPORTANT !!!.txt

Step 2

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

Step 3

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 4

Restore encrypted files from backup.

Step 5

Restart in Safe Mode

[ Learn More ]

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_SOREBRECT.B. 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 this Knowledge Base page for more information.


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