TROJ_PAKES.AUA
Backdoor:Win32/Rasagent.A (Microsoft); Generic Backdoor!hv.i (McAfee); Trojan-Spy.Win32.Zbot.rrk (Kaspersky); Trojan.Crypt.FKM.Gen (v) (Sunbelt); Trojan horse Pakes.DCU (AVG)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
898,560 bytes
EXE
Yes
25 Apr 2013
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.
Installation
This Trojan drops the following copies of itself into the affected system:
- %System%\ntos.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It creates the following folders:
- %System%\wsnpoem
- %User Profile%\Application Data\wsnpoem
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Autostart Technique
This Trojan modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
userinit = "%System%\userinit.exe,%System%\ntos.exe,"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This Trojan deletes the following files:
- %System%\ntos.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_CURRENT_USER\software\microsoft\
windows\currentversion\explorer\
{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
HKEY_CURRENT_USER\software\microsoft\
windows\currentversion\explorer\
{35106240-D2F0-DB35-716E-127EB80A0299}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Network
UID = "ANNA-CWS320_0000788B"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
{F710FA10-2031-3106-8872-93A2B5C5C620} = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
{E716FA10-2031-AA96-8E72-93A205C5C62C} = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
{35106240-D2F0-DB35-716E-127EB80A0299}
{F710FA10-2031-3106-8872-93A2B5C5C620} = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
{35106240-D2F0-DB35-716E-127EB80A0299}
{E716FA10-2031-AA96-8E72-93A205C5C62C} = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Network
UID = "ANNA-CWS320_0000A875"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Network
UID = "ANNA-CWS320_0000D040"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}ba.net/help/languages.bin
This report is generated via an automated analysis system.
SOLUTION
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
Identify and delete files detected as TROJ_PAKES.AUA using either the Startup Disk or Recovery Console
Step 3
Delete this registry key
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_CURRENT_USER\software\microsoft\windows\currentversion\explorer
- {43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
- In HKEY_CURRENT_USER\software\microsoft\windows\currentversion\explorer
- {35106240-D2F0-DB35-716E-127EB80A0299}
Step 4
Delete this registry value
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 NT\CurrentVersion\Network
- UID = "ANNA-CWS320_0000788B"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
- {F710FA10-2031-3106-8872-93A2B5C5C620} = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
- {E716FA10-2031-AA96-8E72-93A205C5C62C} = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\{35106240-D2F0-DB35-716E-127EB80A0299}
- {F710FA10-2031-3106-8872-93A2B5C5C620} = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\{35106240-D2F0-DB35-716E-127EB80A0299}
- {E716FA10-2031-AA96-8E72-93A205C5C62C} = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network
- UID = "ANNA-CWS320_0000A875"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Network
- UID = "ANNA-CWS320_0000D040"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: userinit = "%System%\userinit.exe,%System%\ntos.exe,"
To: userinit = ""%Windows%\system32\userinit.exe,""
- From: userinit = "%System%\userinit.exe,%System%\ntos.exe,"
Step 6
Search and delete these folders
- %System%\wsnpoem
- %User Profile%\Application Data\wsnpoem
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_PAKES.AUA. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System%\ntos.exe
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