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TSPY_DYRE.MAP

August 31, 2015
 ALIASES:

Infostealer.Dyre (Symantec), Win32/Battdil.AN (ESET-NOD32), Upatre-FACE!856B40083E51 (McAfee), TrojanDownloader:Win32/Upatre (Microsoft)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

460,288 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Aug 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.

Installation

This spyware drops the following copies of itself into the affected system and executes them:

  • %Windows%\{random letters}.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It injects threads into the following normal process(es):

  • %System%\svchost.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

This spyware registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\googleupdate
ImagePath = %Windows%\{random filename}.exe

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\googleupdate
Display Name = Google Update Service

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\googleupdate
Start = 2

Other System Modifications

This spyware modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Lsa
LimitBlankPasswordUse = "0"

(Note: The default value data of the said registry entry is "1".)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Terminal Server
fSingleSessionPerUser = "0"

(Note: The default value data of the said registry entry is "1".)

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Terminal Server
fDenyTSConnections = "0"

(Note: The default value data of the said registry entry is "1".)

Other Details

This spyware connects to the following URL(s) to check for an Internet connection:

  • google.com
  • stun.iptel.org

It connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.51.81:443
  • {BLOCKED}.{BLOCKED}.205.69:443
  • {BLOCKED}.{BLOCKED}.191.206:443
  • {BLOCKED}.{BLOCKED}.238.189:443
  • {BLOCKED}.{BLOCKED}.224.118:443

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.884.00

FIRST VSAPI PATTERN DATE:

28 Aug 2015

VSAPI OPR PATTERN File:

11.885.00

VSAPI OPR PATTERN Date:

29 Aug 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\googleupdate
    • ImagePath = %Windows%\{random filename}.exe
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\googleupdate
    • Display Name = Google Update Service
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\googleupdate
    • Start = 2

Step 5

Restore this modified 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\SYSTEM\CurrentControlSet\Control\Lsa
    • From: LimitBlankPasswordUse = "0"
      To: LimitBlankPasswordUse = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server
    • From: fSingleSessionPerUser = "0"
      To: fSingleSessionPerUser = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server
    • From: fDenyTSConnections = "0"
      To: fDenyTSConnections = "1"

Step 6

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