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TROJ_ZLOB.SMFM

January 06, 2016
 Analysis by: Don Ovid Ladores
 THREAT SUBTYPE:

Information Stealer

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This Trojan arrives via removable drives. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

184320 bytes

File Type:

DLL

Memory Resident:

Yes

Payload:

Steals information, Downloads files

Arrival Details

This Trojan arrives via removable drives.

It may be dropped by other malware.

Installation

This Trojan drops the following files:

  • {removable drive}:\__d__.lnk (detected as EXPL_CPLINK.SM)
  • { removable drive}:\__e__.lnk (detected as EXPL_CPLINK.SM)
  • { removable drive}:\__f__.lnk (detected as EXPL_CPLINK.SM)
  • { removable drive}:\__g__.lnk (detected as EXPL_CPLINK.SM)
  • { removable drive}:\__h__.lnk (detected as EXPL_CPLINK.SM)
  • { removable drive}:\__i__.lnk (detected as EXPL_CPLINK.SM)
  • { removable drive}:\__j__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\WSPDll.dll
  • %systemroot%\system32\ECELP4.ACM (detected as TROJ_AGENT.IAAN)
  • %systemroot%\system32\shelldoc.dll detected as TROJ_FANNY.AA)
  • %temp%\msupdate.exe (detected as TROJ_FANNY.AC)
  • %systemroot%\MSAgent\AGENTCPD.DLL (detected as TROJ_FANNY.AB)
  • %systemroot%\system32\__d__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\__e__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\__f__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\__g__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\__h__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\__i__.lnk (detected as EXPL_CPLINK.SM)
  • %systemroot%\system32\__j__.lnk (detected as EXPL_CPLINK.SM)

It drops the following copies of itself into the affected system:

  • %systemroot%\system32\comhost.dll
  • %systemroot%\system32\mscorwin.dll
  • %systemroot%\system32\RCX16A.tmp

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

  • GlobalRPCMutex25

Other System Modifications

This Trojan adds the following registry entries:

HKEY_Local_Machine\Software\Microsoft\
MsNetMng
COM = %systemroot%\system32\comhost.dll

HKEY_Local_Machine\Software\Microsoft\
MsNetMng
Version = 0

HKEY_Local_Machine\Software\Microsoft\
MsNetMng
Status = 01 00 00 00

HKEY_Local_Machine\Software\Microsoft\
MsNetMng
Policy = 00 00 00 00

It adds the following registry entries as part of its installation routine:

HKEY_Local_Machine\System\CurrentControlSet\
Control\MediaResources\acm\
ECELP4
filter8 = lsass#%systemroot%\system32\mscorwin.dll

HKEY_Local_Machine\System\CurrentControlSet\
Control\MediaResources\acm\
ECELP4
filter3 = explorer#%systemroot%\system32\shelldoc.dll

HKEY_Local_Machine\System\CurrentControlSet\
Control\MediaResources\acm\
ECELP4
filter2 = winlogon#%systemroot%\MSAgent\AGENTCPD.DLL

HKEY_Local_Machine\System\CurrentControlSet\
Control\MediaResources\acm\
ECELP4
DevNode = 0

HKEY_Local_Machine\System\CurrentControlSet\
Control\MediaResources\acm\
ECELP4
Driver = %systemroot%\system32\ECELP4.ACM

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}upplystore.mooo.com/ads/QueryRecord200586_f2ahx.html
  • http://{BLOCKED}upplystore.mooo.com/results/QueryRecord200586_f2ahx.eot

Information Theft

This Trojan gathers the following data:

  • Host Name
  • Username
  • Running Processes
  • Adapter Type
  • MAC Address
  • IP Address

NOTES:

If the infection is from USB drives, the malware is seen fanny.bmp and is usually bundled with malicious LNK files related to CVE-2010-2568. We detect this as EXPL_CPLINK.SM.

These malicious LNK files enable the execution and spread of the malware to removable drives even if Autorun feature is disabled.

It exploits the vulnerability addressed in CVE-2009-1123 to escalate privileges.

After the privilege escalation, it connects to its C&C URLs where the response from the connection is another URL.

The malware connects to the received URL where it sends the stolen system information. The URL response is a binary executable file which is downloaded and executed as part of the infection chain on the affected system as %System Root%\system32\msregstr.exe.

It has the ability to do SSDT Hook on NT!ShutdownSystem that allows the malware to be persistent on the system.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

11.490.05

FIRST VSAPI PATTERN DATE:

20 Feb 2015

VSAPI OPR PATTERN File:

11.491.00

VSAPI OPR PATTERN Date:

21 Feb 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

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.

Step 3

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.

Step 4

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.

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_ZLOB.SMFM. 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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