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TSPY_PAPRAS.CS

October 09, 2012
 Analysis by: Mark Joseph Manahan
 ALIASES:

TrojanSpy:Win32/Ursnif.GU (Microsoft), Win32/PSW.Papras.CE trojan (Eset), Troj/Medfos-AQ (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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:

56,832 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

17 Aug 2012

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.

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\AppDataLow

HKEY_CURRENT_USER\SOFTWARE\AppDataLow\
{Random GUID}

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}bformerour.co.cc
  • {BLOCKED}ourcalled.co.cc

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.330.05

FIRST VSAPI PATTERN DATE:

17 Aug 2012

VSAPI OPR PATTERN File:

9.331.00

VSAPI OPR PATTERN Date:

18 Aug 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

Scan your computer with your Trend Micro product and note files detected as TSPY_PAPRAS.CS

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ 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
    • AppDataLow

Step 5

Search and delete the file detected as TSPY_PAPRAS.CS

*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.

To manually delete a malware/grayware file from the affected system:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

Step 6

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