TSPY_BANKER.SNP

October 09, 2012
 Analysis by: Cris Nowell Pantanilla
 Modified by: Christopher Daniel So
 ALIASES:

Trojan:Win32/Qhosts.AS (Microsoft), Trojan.Gen (Symantec)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This spyware reads an IP address from the file CONFIG.INI. As of this writing, the IP address is {BLOCKED}.{BLOCKED}.237.26.

It then overwrites the HOSTS file.

This spyware may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

413,696 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Jun 2012

Payload:

Deletes files

Arrival Details

This spyware may be dropped by the following malware:

  • TROJ_QHOST.BJF

Other System Modifications

This spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\HDSoft
RunPach = "{malware path}"

HKEY_LOCAL_MACHINE\Software\Policies\
Microsoft\Internet Explorer\Security
DisableSecuritySettingsCheck = "1"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1201 = "0"

(Note: The default value data of the said registry entry is 3.)

NOTES:

It reads an IP address from the file CONFIG.INI. As of this writing, the IP address is {BLOCKED}.{BLOCKED}.237.26.

It then overwrites the HOSTS file with the following:

  • {BLOCKED}.{BLOCKED}.237.26 www.kbstar.com kbstar.com obank.kbstar.com banking.nonghyup.com www.wooribank.com wooribank.com pib.wooribank.com bank.keb.co.kr www.keb.co.kr

If run with the command-line parameter 101, it reads the value of the following registry entry:

HKEY_CURRENT_USER\Software\HDSoft RunPach

It then deletes the following files:

  • {value of RunPach}\HDExpress.exe
  • C:\WINDOWS\system32\drivers\etc\hosts

It then deletes itself.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.188.05

FIRST VSAPI PATTERN DATE:

13 Jun 2012

VSAPI OPR PATTERN File:

9.189.00

VSAPI OPR PATTERN Date:

13 Jun 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove the malware/grayware file that dropped/downloaded TSPY_BANKER.SNP

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\HDSoft
    • RunPach = "{malware path}"
  • In HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\Security
    • DisableSecuritySettingsCheck = "1"

Step 4

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • From: 1201 = "0"
      To: 1201 = "3"

Step 5

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

Step 6

Restore this deleted registry key/value from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

 
  • C:\WINDOWS\system32\drivers\etc\hosts


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