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TROJ_KRYPTK.YRV

March 07, 2014
 Analysis by: Jimelle Monteser
 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: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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:

111,464 bytes

File Type:

EXE

Initial Samples Received Date:

28 Feb 2014

Arrival Details

This Trojan 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 Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\{random}

HKEY_CURRENT_USER\SOFTWARE\{random}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASMANCS

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\{random}
License = "951"

HKEY_CURRENT_USER\SOFTWARE\{random}
License = "951"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32
EnableFileTracing = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32
EnableConsoleTracing = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32
FileTracingMask = "4294901760"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32
ConsoleTracingMask = "4294901760"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32
MaxFileSize = "1048576"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Tracing\1_RASAPI32
FileDirectory = "%Windows%\Tracing"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}t-18.com/b/shoe/951
  • {BLOCKED}a-coil.com/lib89.47/jquery/