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BKDR_SWRORT.YKH

March 31, 2017
 Analysis by: John Anthony Banes
 ALIASES:

Trojan:Win32/Swrort.A (Microsoft); W32/Rozena.PL!tr (Fortinet); a variant of Win32/Rozena.PL trojan (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This Backdoor 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

File Size:

7,168 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 Mar 2017

Payload:

Connects to URLs/IPs

Arrival Details

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

Backdoor Routine

This Backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.177.253:4444

As of this writing, the said sites are inaccessible.

Other Details

This Backdoor does the following:

  • Connects to its server to receive arbitrary codes which it executes

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.306.05

FIRST VSAPI PATTERN DATE:

29 Mar 2017

VSAPI OPR PATTERN File:

13.307.00

VSAPI OPR PATTERN Date:

30 Mar 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 BKDR_SWRORT.YKH. 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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