Windows
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.
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.
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.imaadpcm
fdwSupport = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.imaadpcm
cFormatTags = "2"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.imaadpcm
aFormatTagCache = "\x01\x00\x00\x00\x10\x00\x00\x00\x11\x00\x00\x00\x14\x00\x00\x00"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.imaadpcm
cFilterTags = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msg711
fdwSupport = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msg711
cFormatTags = "3"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msg711
aFormatTagCache = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msg711
cFilterTags = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msgsm610
fdwSupport = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msgsm610
cFormatTags = "2"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msgsm610
aFormatTagCache = "\x01\x00\x00\x00\x10\x00\x00\x001\x00\x00\x00\x14\x00\x00\x00"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msgsm610
cFilterTags = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msadpcm
fdwSupport = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msadpcm
cFormatTags = "2"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msadpcm
aFormatTagCache = "\x01\x00\x00\x00\x10\x00\x00\x00\x02\x00\x00\x002\x00\x00\x00"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.msadpcm
cFilterTags = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.l3acm
fdwSupport = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.l3acm
cFormatTags = "2"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.l3acm
aFormatTagCache = "\x01\x00\x00\x00\x10\x00\x00\x00U\x00\x00\x00\x1e\x00\x00\x00"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\AudioCompressionManager\DriverCache\
msacm.l3acm
cFilterTags = "0"
Dropping Routine
This Trojan drops the following files:
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)
Other Details
This Trojan connects to the following possibly malicious URL:
This report is generated via an automated analysis system.
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
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.
Step 3
Search and delete these components
Step 4
Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.STARTER.TIIBHBA. 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 the following Trend Micro Support pages for more information: