Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan:Win32/Demtranc.B (Microsoft), BackDoor-EKF (McAfee), a variant of Win32/Demtranc.AA trojan (Eset), Backdoor.Trojan (Symantec)

 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:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

Tipo de compactação: 28,672 bytes
Tipo de arquivo: EXE
Residente na memória: Yes
Data de recebimento das amostras iniciais: 25 Aug 2010

Arrival Details

This backdoor may be dropped by other malware.

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}1.us/SUS{value}O{value}.jsp?{value}
  • {BLOCKED}.{BLOCKED}1.us/DES{value}O{value}.jsp?{value}
  • {BLOCKED}.{BLOCKED}1.us/AES{value}O{value}.jsp?{value}
  • {BLOCKED}.{BLOCKED}1.us/PES{value}O{value}.jsp?{value}
  • {BLOCKED}.{BLOCKED}1.us/ZES{value}O{value}.jsp?{value}
  • {BLOCKED}.{BLOCKED}1.us/SEU{value}O{value}.jsp?{value}

  SOLUTION

Mecanismo de varredura mínima: 9.300
VSAPI OPR Pattern Version: 7.407.00
VSAPI OPR Pattern veröffentlicht am: 25 Aug 2010

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

Identify and terminate files detected as BKDR_DEMTRANC.AJ

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_DEMTRANC.AJ. 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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