TSPY_ZBOT.YUYAIS

October 26, 2015
 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware 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:

167,096 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

26 Oct 2015

Arrival Details

This spyware 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 spyware adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}
CLSID = "Standard Font"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}
InprocServer32 = "oleaut32.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}
ProgID = "StdFont"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
StdFont
CLSID = "{0BE35203-8F91-11CE-9DE3-00AA004BB851}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}
CLSID = "Obsolete Font"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}
InprocServer32 = "oleaut32.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}
ProgID = "OldFont"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
OldFont
CLSID = "{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}
CLSID = "Standard Picture"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}
InprocServer32 = "oleaut32.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}
ProgID = "StdPicture"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
StdPicture
CLSID = "{0BE35204-8F91-11CE-9DE3-00AA004BB851}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00020420-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00020421-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00020422-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00020423-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00020424-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00020425-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{B196B286-BAB4-101A-B69C-00AA00341D07}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0000002F-0000-0000-C000-000000000046}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}\InprocServer32
ThreadingModel = "Both"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}\InprocServer32
ThreadingModel = "Apartment"

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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

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_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}
    • CLSID = "Standard Font"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}
    • InprocServer32 = "oleaut32.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}
    • ProgID = "StdFont"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\StdFont
    • CLSID = "{0BE35203-8F91-11CE-9DE3-00AA004BB851}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}
    • CLSID = "Obsolete Font"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}
    • InprocServer32 = "oleaut32.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}
    • ProgID = "OldFont"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OldFont
    • CLSID = "{46763EE0-CAB2-11CE-8C20-00AA0051E5D4}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}
    • CLSID = "Standard Picture"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}
    • InprocServer32 = "oleaut32.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}
    • ProgID = "StdPicture"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\StdPicture
    • CLSID = "{0BE35204-8F91-11CE-9DE3-00AA004BB851}"

Step 3

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020420-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020421-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020422-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020423-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020424-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00020425-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{B196B286-BAB4-101A-B69C-00AA00341D07}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0000002F-0000-0000-C000-000000000046}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35203-8F91-11CE-9DE3-00AA004BB851}\InprocServer32
    • From: ThreadingModel = "Both"
      To: ThreadingModel = ""Both""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{0BE35204-8F91-11CE-9DE3-00AA004BB851}\InprocServer32
    • From: ThreadingModel = "Apartment"
      To: ThreadingModel = ""Apartment""

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.YUYAIS. 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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