Analysis by: Ryan Paolo Maglaque
 PLATFORM:

Windows

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

  • Threat Type: Rootkit

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Canal de infección Dropped by other malware, Downloaded from the Internet

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

  TECHNICAL DETAILS

Tamaño del archivo 57,040 bytes
Tipo de archivo SYS
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 08 Jun 2017
Carga útil Others

Arrival Details

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

Other Details

This Rootkit does the following:

  • Adds filter on tcp/ip based networks
  • It uses RtlGetVersion to check os version
  • Hooks the following IRP major functions:
    • IRP_MJ_CREATE
    • IRP_MJ_CLOSE
    • IRP_MJ_READ
    • IRP_MJ_WRITE
    • IRP_MJ_SHUTDOWN
    • IRP_MJ_DEVICE_CONTROL
  • It disables kernel debugger
  • If the system is older than windows Vista, it will hook the following tcpip.sys functions:
    • IpInjectPkt
    • IpAllocBuff
    • IpFreeBuff
  • If the system is windows Vista or greater, it will hook the following ndis.sys and fwpkclnt.sys functions:
    • NdisAllocateMdl
    • NdisAllocateMemoryWithTagPriority
    • NdisFreeMdl
    • NdisRetreatNetBufferDataStart
    • NdisGetDataBuffer
    • NdisFreeNetBufferListPool
    • NdisFreeGenericObject
    • NdisAllocateNetBufferListPool
    • NdisAllocateGenericObject
    • NdisAdvanceNetBufferDataStart
    • FwpsInjectionHandleCreate0
    • FwpsInjectNetworkSendAsync0
    • FwpsInjectNetworkReceiveAsync0
    • FwpsQueryPacketInjectionState0
    • FwpsInjectionHandleDestroy0
    • FwpsCalloutRegister0
    • FwpsCalloutUnregisterByKey0
    • FwpmEngineOpen0
    • FwpmEngineClose0
    • FwpmTransactionBegin0
    • FwpmTransactionAbort0
    • FwpmTransactionCommit0
    • FwpmCalloutAdd0
    • FwpmCalloutDeleteByKey0
    • FwpmFilterAdd0
    • FwpmSubLayerAdd0
    • FwpmFilterDeleteByKey0
    • FwpmSubLayerDeleteByKey0
    • FwpsAllocateNetBufferAndNetBufferList0
    • FwpsFreeNetBufferList0
    • FwpsFreeCloneNetBufferList0
  • It creates the following callout filters:
    • CalloutIn
    • CalloutOut
    • CalloutListen
    • CalloutAccept
    • CalloutResource

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 13.570.04
Primera fecha de publicación de patrones de VSAPI 02 Aug 2017
Versión de patrones OPR de VSAPI 13.571.00
Fecha de publicación de patrones OPR de VSAPI 03 Aug 2017

Step 1

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

Step 2

Scan your computer with your Trend Micro product to delete files detected as RTKT64_KERLISEN.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.


Did this description help? Tell us how we did.