Analysis by: Rhena Inocencio
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 847,872 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 26 Jun 2013
Payload: Connects to URLs/IPs, Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_DIDKR.C or
  • TROJ64_DIDKR.C

NOTES:

This Trojan sends DDoS traffic. The DDoS attack is implemented by sending DNS queries to two hardcoded target IP addresses:

  • {BLOCKED}.1.10
  • {BLOCKED}.200.6

It queries for the following domain:

  • {pseudorandom string}.gcc.go.kr

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.122.03
FIRST VSAPI PATTERN DATE: 28 Jun 2013
VSAPI OPR PATTERN File: 10.123.00
VSAPI OPR PATTERN Date: 28 Jun 2013

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

Remove malware/grayware files that dropped/downloaded DDOS_DIDKR.C

    • TROJ_DIDKR.C
    • TROJ64_DIDKR.C

Step 3

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