Modified by: Adrian Cofreros
ALIASES:

TrojanProxy:Win32/Pramro.D (Microsoft); Generic BackDoor!dfc (McAfee); Trojan.Pramro (Symantec); PAK:UPX, Backdoor.Win32.Mazben.f (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Generic.Malware.FYdld.699A08BE (FSecure)

 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:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 16,554 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 05 Oct 2013

Installation

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

  • qiwuyeiu2983

Other System Modifications

This Trojan creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:Enabled:ipsec"

Download Routine

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

  • http://{BLOCKED}pping.com/img/icons/logo.gif
  • http://{BLOCKED}ellbeing.com.au/img/icons/logo.gif
  • http://{BLOCKED}itreward.it/images/logo.gif
  • http://{BLOCKED}s-soft.fr/img/logo.gif
  • http://{BLOCKED}ofotografico.com.br/logof.gif

It saves the files it downloads using the following names:

  • %User Temp%\win{random characters}.exe

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

  SOLUTION

Minimum Scan Engine: 9.300

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

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.

RESTORE
  • Close Registry Editor.

    • Step 4

    Scan your computer with your Trend Micro product to delete files detected as TROJ_PRAMRO.SMI. 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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