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BKDR_BLYPT.A

September 20, 2013
 Analysis by: Alvin Bacani
 ALIASES:

Trojan.Fakeavlock (Symantec); Trojan-Dropper.Win32.Injector.icfe (Kaspersky)

 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: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This backdoor is a variant of the malware family BLYPT. It uses binary large objects (BLOB) to store information in the affected system's registry. It also utilizes encryption. Users affected by this malware may find the security of their systems compromised.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

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.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

39,936 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 Sep 2013

Payload:

Compromises system security

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 entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
SystemCertificates\CA\Certificates\
5A82739996ED9EBA18F1BBCDCCA62D2C1D670C
Blob = "{Encrypted configuration data}"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and execute the main backdoor component

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}lution134.org:80
  • {BLOCKED}.{BLOCKED}.162.47:81
  • {BLOCKED}.{BLOCKED}.162.45:81
  • {BLOCKED}.{BLOCKED}.181.50:81
  • {BLOCKED}.{BLOCKED}.186.14:778
  • {BLOCKED}.{BLOCKED}.186.9:777
  • {BLOCKED}.{BLOCKED}.186.27:777
  • {BLOCKED}.{BLOCKED}.121.141:777
  • {BLOCKED}.{BLOCKED}.97.02:777
  • {BLOCKED}.{BLOCKED}.186.47:81
  • {BLOCKED}.{BLOCKED}.186.45:81

Download Routine

This backdoor saves the files it downloads using the following names:

  • %Application Data%\Microsoft\Crypto\NTCRYPT{variable}.TPL
  • %Application Data%\Microsoft\Crypto\CERTV{variable}.TPL

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

live casino online detects the dowloaded file as:

  • BKDR_BLYPT.B
  • BKDR64_BLYPT.B
  • BKDR_BLYPT.SM

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.290.08

FIRST VSAPI PATTERN DATE:

21 Sep 2013

VSAPI OPR PATTERN File:

10.291.00

VSAPI OPR PATTERN Date:

21 Sep 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must to allow full scanning of their computers.

Step 2

Remove malware/grayware files dropped/downloaded by BKDR_BLYPT.A