Analysis by: Christopher Daniel So
ALIASES:

Trojan:Win32/Malagent!gmb (Microsoft), Backdoor.Win32.Dyreza.d (Kaspersky), Win32/Battdil.C (ESET), W32/Dyreza.C!tr.bdr (Fortinet), Win32:Malware-gen (Avast)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This malware is the Dyre banking Trojan, also known as “Dyreza."

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

This Spyware may be dropped by other malware.

It may be injected into processes running in memory.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: Varies
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 09 Sep 2014
Payload: Steals information, Connects to URLs/IPs

Arrival Details

This Spyware may be dropped by other malware.

Installation

This Spyware drops the following file(s)/component(s):

  • %Application Data%\whr458da.db - configuration file

(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, 7, and 8.)

It injects itself into the following processes running in the affected system's memory:

  • chrome.exe
  • firefox.exe
  • iexplore.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\cdv5b74f5y7

It may be injected into processes running in memory.

Other Details

This Spyware connects to the following URL(s) to get the affected system's IP address:

  • http://BLOCKED}hazip.com

It connects to the following website to send and receive information:

  • {BLOCKED}.{BLOCKED}34.142.186:443
  • {BLOCKED}.{BLOCKED}55.183.98:443
  • {BLOCKED}.{BLOCKED}65.249.224:443
  • {BLOCKED}.{BLOCKED}65.212.188:443
  • {BLOCKED}.{BLOCKED}65.194.117:443
  • {BLOCKED}.{BLOCKED}7.71.122:443
  • {BLOCKED}.{BLOCKED}.236.54:443
  • {BLOCKED}.{BLOCKED}65.204.210:443
  • {BLOCKED}.{BLOCKED}.250.88:443
  • {BLOCKED}.{BLOCKED}.220.166:443
  • {BLOCKED}.{BLOCKED}65.204.223:443
  • {BLOCKED}.{BLOCKED}65.237.178:443
  • {BLOCKED}.{BLOCKED}65.237.144:443
  • {BLOCKED}.{BLOCKED}65.237.145:443
  • {BLOCKED}.{BLOCKED}65.237.145:443

NOTES:
It may update its configuration file and obtain entities to target through the C&C servers specified in the default configuration file.

  SOLUTION

Minimum Scan Engine: 9.700
VSAPI OPR PATTERN File: 11.139.00
VSAPI OPR PATTERN Date: 10 Sep 2014

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %Application Data%\whr458da.db

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_BANKER.DYR. 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 the following Trend Micro Support pages for more information:


Did this description help? Tell us how we did.