Analysis by: Vincent Martin Hermosura
ALIASES:

Trojan horse PSW.Banker_s.KV (AVG),W32/Banload.AL!tr (Fortinet), Trojan-Downloader.Win32.Banload (Ikarus), RDN/PWS-Banker!dg (NAI), a variant of Win32/TrojanDownloader.Banload.TUS trojan (Nod32), Trojan.Win32.Generic!BT (Sunbelt), TR/Crypt.Xpack.77513 (Antivir)

 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: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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.

It accesses websites to download files. This action allows this malware to possibly add other malware on the affected computer.

  TECHNICAL DETAILS

File Size: 715,029 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 08 Jul 2014
Payload: Downloads files

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.

Autostart Technique

This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
startrum = "startrum.cpl"

Download Routine

This Trojan accesses websites to download the following files:

  • http://{BLOCKED}mau.info/PerfLogs/R_Perf/02/FishFactsMapping.bck

It saves the files it downloads using the following names:

  • %Application Data%\UserProfile\FishFactsMapping.bck

(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 and 7.)

NOTES:

The downloaded file %Application Data%\UserProfile\FishFactsMapping.bck contains the following files:

  • adobflasplay.cpl detected as TROJ_CHEPRO.BBC
  • bck.bck
  • fishfactsmapping.xml
  • startrum.cpl detected as TROJ_INJECT.CAC
  • svchort.drv
  • taskhost.drv

It then extracts the said files as the following:

  • %Application Data%\UserProfile\adobflasplay.cpl
  • %Application Data%\UserProfile\bck.bck
  • %Application Data%\UserProfile\fishfactsmapping.xml
  • %Application Data%\UserProfile\startrum.cpl
  • %Application Data%\UserProfile\svchort.drv
  • %Application Data%\UserProfile\taskhost.drv

After extracting the files, the downloaded file %Application Data%\UserProfile\FishFactsMapping.bck is deleted.

It reboots the system. Once it restarts, the created autorun registry by the malware runs. As result, malicious routines of these files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.700

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

Remove the malware/grayware file dropped/downloaded by TROJ_BANLOAD.APS. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • TROJ_CHEPRO.BBC
    • TROJ_INJECT.CAC

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.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • startrum = "startrum.cpl"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.APS. 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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