Analysis by: jasperm
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

When executed with the parameters dns {IP address 1},{IP address 2}, TROJ_GORIADU.SMX replaces the DNS servers used by the system with {IP address 1} and {IP address 2}. When executed with the parameters md5 -s {file name 1} -d {file name 2}, it appends random data in {file name 1} and saves it as {file name 2}.

This malware is executed by TROJ_FKEPLAYR.CH using certain parameters to drop files named ipseccmd.exe and setup{numbers}.exe. The files s0001.xml and dsop7.xml in the parameters are encrypted files also included in the malware package dropped by TROJ_FKEPLAYR.CH. TROJ_FKEPLAYR.CH will then execute ipseccmd.exe which is a legitimate Microsoft file used to configure IP Security Policy, using certain parameters to block communication between the affected machine and certain IP addresses. TROJ_FKEPLAYR.CH also executes setup{numbers}.exe which is detected as TROJ_GORIADU.DRP, using the parameter "/VERYSILENT /NORESTART" to install its main malware components.

This Trojan may be dropped by other malware.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 24 Jan 2011
Payload: Executes legitimate files to block communication between the affected machine and certain IP addresses

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_FKEPLAYR.CH

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Other Details

This Trojan does the following:

  • When executed with the parameters DNS {IP address 1},{IP address 2}, it replaces the DNS servers used by the system with {IP address 1} and {IP address 2}.
  • When executed with the parameters md5 -s {file name 1} -d {file name 2}, it appends random data in {file name 1} and saves it as {file name 2}.
  • This malware is executed by TROJ_FKEPLAYR.CH using the following parameters to drop files named ipseccmd.exe and setup{numbers}.exe:
    • msfsg.exe uncompress -s s0001.xml -d ipseccmd.exe
    • msfsg.exe md5 -s ipseccmd.exe -d ipseccmd.exe -l 10000000
    • msfsg.exe uncompress -s dsop7.xml -d setup756432.exe
    The files s0001.xml and dsop7.xml in the parameters are encrypted files also included in the malware package dropped by TROJ_FKEPLAYR.CH.
  • TROJ_FKEPLAYR.CH will then execute ipseccmd.exe which is a legitimate Microsoft file used to configure IP Security Policy, using the following parameters to block communication between the affected machine and certain IP addresses:
    • sc start PolicyAgent
    • ipseccmd -p Block1 -r BlockTCP -f 119.147.91.*+0 -n BLOCK -x
    • ipseccmd -p Block2 -r BlockNEW -f 119.188.4.*+0 -n BLOCK -x
    • ipseccmd -p Block3 -r BlockTWO -f 122.70.130.*+0 -n BLOCK -x
    • ipseccmd -p Block4 -r BlockTHREE -f 124.238.243.*+0 -n BLOCK -x
    • ipseccmd -p Block5 -r Block5 -f 124.238.244.*+0 -n BLOCK -x
    • ipseccmd -p Block6 -r Block6 -f 125.39.100.*+0 -n BLOCK -x
    • ipseccmd -p Block7 -r Block7 -f 125.39.102.*+0 -n BLOCK -x
    • ipseccmd -p Block8 -r Block8 -f 220.181.126.*+0 -n BLOCK -x
    • ipseccmd -p Block9 -r Block9 -f 221.194.142.*+0 -n BLOCK -x
    • ipseccmd -p Block0 -r Block0 -f 118.145.31.*+0-n BLOCK -x
  • TROJ_FKEPLAYR.CH also executes setup{numbers}.exe which is detected as TROJ_GORIADU.DRP, using the parameter "/VERYSILENT /NORESTART" to install its main malware components.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 7.792.09
FIRST VSAPI PATTERN DATE: 25 Jan 2011
VSAPI OPR PATTERN File: 7.793.00
VSAPI OPR PATTERN Date: 25 Jan 2011

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 the malware/grayware file dropped/downloaded by TROJ_GORIADU.SMX

Step 3

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