TROJ_DIALER.NZY
Trojan:Win32/Adialer.B (Microsoft); Dialer-267. (McAfee); Dialer.Trafficadvance (Symantec); PAK:UPX, Trojan.Win32.Diamin.i (Kaspersky); Trojan.Win32.Diamin.gen (v) (Sunbelt); Trojan:W32/Dialer.gen!B (FSecure)
Windows 2000, XP, 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
16,144 bytes
EXE
No
11 Oct 2011
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 creates the following folders:
- %User Profile%\CryptnetUrlCache\MetaData
- %User Profile%\Microsoft\CryptnetUrlCache
- %User Profile%\CryptnetUrlCache\Content
(Note: %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.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
SystemCertificates\TrustedPublisher
HKEY_CURRENT_USER\Software\Microsoft\
SystemCertificates\TrustedPublisher\Certificates
HKEY_CURRENT_USER\Software\Microsoft\
SystemCertificates\TrustedPublisher\CRLs
HKEY_CURRENT_USER\Software\Microsoft\
SystemCertificates\TrustedPublisher\CTLs
HKEY_CURRENT_USER\Software\Policies\
Microsoft\SystemCertificates\TrustedPublisher
HKEY_CURRENT_USER\Software\Policies\
Microsoft\SystemCertificates\TrustedPublisher\
Certificates
HKEY_CURRENT_USER\Software\Policies\
Microsoft\SystemCertificates\TrustedPublisher\
CRLs
HKEY_CURRENT_USER\Software\Policies\
Microsoft\SystemCertificates\TrustedPublisher\
CTLs
Dropping Routine
This Trojan drops the following files:
- %User Profile%\MetaData\60E31627FDA0A46932B0E5948949F2A5
- %User Profile%\Content\60E31627FDA0A46932B0E5948949F2A5
- %User Profile%\MetaData\A8FABA189DB7D25FBA7CAC806625FD30
- %User Profile%\Content\A8FABA189DB7D25FBA7CAC806625FD30
(Note: %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.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
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\SystemCertificates
- TrustedPublisher
- In HKEY_CURRENT_USER\Software\Microsoft\SystemCertificates\TrustedPublisher
- Certificates
- In HKEY_CURRENT_USER\Software\Microsoft\SystemCertificates\TrustedPublisher
- CRLs
- In HKEY_CURRENT_USER\Software\Microsoft\SystemCertificates\TrustedPublisher
- CTLs
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\SystemCertificates
- TrustedPublisher
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher
- Certificates
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher
- CRLs
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\SystemCertificates\TrustedPublisher
- CTLs
Step 3
Search and delete these folders
- %User Profile%\CryptnetUrlCache\MetaData
- %User Profile%\Microsoft\CryptnetUrlCache
- %User Profile%\CryptnetUrlCache\Content
Step 4
Search and delete these components
- %User Profile%\MetaData\60E31627FDA0A46932B0E5948949F2A5
- %User Profile%\Content\60E31627FDA0A46932B0E5948949F2A5
- %User Profile%\MetaData\A8FABA189DB7D25FBA7CAC806625FD30
- %User Profile%\Content\A8FABA189DB7D25FBA7CAC806625FD30
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_DIALER.NZY. 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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