Analysis by: Rhena Inocencio
ALIASES:

Backdoor.Remsec (Symantec), a variant of Win64/Cremes.A (ESET), a variant of Win64/Cremes.B (ESET), a variant of Win32/Cremes.D (ESET)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: Varies
File Type: DLL, EXE
Memory Resident: Yes
Initial Samples Received Date: 05 Aug 2016
Payload: Connects to URLs/IPs

Arrival Details

This malware arrives via the following means:

  • possibly deployed in a compromised system by remote malicious users

NOTES:

This is a malware consisting of different modules, each module having its own purpose. It may download any of the following modules into the system:

  • rpchlpr.exe - may receive and execute arbitrary code from malicious remote user
  • scsvc32.exe - may receive any of the following commands through named pipes:
    • Read a file
    • Download a file
    • Delete a file
    • List folders
  • sxsapifeed.dll or wmupdsvc.dll - connects to the following C&Cs:
    • http://flowershop22.{BLOCKED}b.com/shop.php
    • http://flowershop22.{BLOCKED}b.com/flowers.php
    • http://wildhorses.{BLOCKED}pace.info/hindex.php
    • http://wildhorses.{BLOCKED}pace.info/horses.php
    • http://www.{BLOCKED}music.com/music.php
    • http://www.{BLOCKED}music.com/mymusic.php
  • krbsec.dll - may perform any of the following:
    • Load plugin DLLs
    • List process IDs
    • Keylogging
  • rcnfsys.dll or ncnfloc.dll - listens for response packets and executes the received code

Most of the variants of REMSEC malware family use the entry function InitializeChangeNotify.

  SOLUTION

Minimum Scan Engine: 9.800

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

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

Scan your computer with your Trend Micro product and note files detected as BKDR_REMSEC.A

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete files detected as BKDR_REMSEC.A

[ 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.

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_REMSEC.A. 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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