TROJ_RAMDO.JER
Trojan:Win32/Ramdo.A (Microsoft), Trojan.Ramdo (Symantec), W32/Redyms.AF!tr (Fortinet)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 deletes the initially executed copy of itself.
TECHNICAL DETAILS
299,008 bytes
EXE
Yes
31 Mar 2014
Connects to URLs/IPs, Compromises system security
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:
- %Application Data%\Adobe\acupx217.dll
(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.)
It adds the following processes:
- %Program Files%\iexplore.exe
- %Windows%\winhelp32.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Global\{GUID}iU-ffffffff
It injects codes into the following process(es):
- %Windows%\winhelp32.exe
- %Program Files%\iexplore.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Autostart Technique
This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\EPUHelp.exe
(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, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Cookies\index.dat
- %User Profile%\Cookies\* - All cookie files
(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.)
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\SOFTWARE\Adobe\
Acrobat Reader\10.0\IPM
iTestPropulsion = "{encrypted values}"
HKEY_CURRENT_USER\SOFTWARE\Adobe\
Acrobat Reader\10.0\IPM
iTestShears = "{encrypted values}"
Backdoor Routine
This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{randomly generated domain}.org/
It posts the following information to its command and control (C&C) server:
- GUID
- OS version
- Adobe Flash version
- Virtual machine status
Other Details
This Trojan connects to the following URL(s) to check for an Internet connection:
- http://www.google.com/
It deletes the initially executed copy of itself
NOTES:
This Trojan creates another instance of an existing process and modifies the entrypoint code of the process to execute the following component:
- %Application Data%\Adobe\acupx217.dll
It searches for the following loaded DLLs and attempts to unload them:
- UMEngx86.dll - (Norton AV product component)
- wl_hook.dll - (Agnitum Firewall product component)
It sets the attribute of the following file to Encrypted:
- %User Startup%\EPUHelp.exe
It checks the following registry entry for the strings VMWARE,VBOX, and VIRTUAL to determine if it is running under virtual environment:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum
It scans the following registry entries to determine the Adobe Flash version installed on the system:
HKEY_LOCAL_MACHINE\software\classes\clsid\{d27cdb6e-ae6d-11cf-96b8- 444553540000}
HKEY_LOCAL_MACHINE\software\macromedia\flashplayeractivex
It uses the following URL as referrer to access the site where it generates its click-fraud:
- http://{BLOCKED}litter.com/
It uses the advertisements from the following IP address for its click-fraud routine:
- {BLOCKED}.{BLOCKED}.193.11
It deletes all URL cache entries contained in the following file if it fails to delete the file itself:
- %User Profile%\Cookies\index.dat
It hooks the following APIs to hide its click-fraud routine:
- CoCreateInstance
- DialogBoxIndirectParamAorW
- GetCursorPos
SOLUTION
9.700
10.698.09
31 Mar 2014
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
Restart in Safe Mode
Step 3
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_CURRENT_USER\SOFTWARE\Adobe\Acrobat Reader\10.0\IPM
- iTestPropulsion = "{encrypted values}"
- iTestPropulsion = "{encrypted values}"
- In HKEY_CURRENT_USER\SOFTWARE\Adobe\Acrobat Reader\10.0\IPM
- iTestShears = "{encrypted values}"
- iTestShears = "{encrypted values}"
Step 4
Search and delete these files
- %Application Data%\Adobe\acupx217.dll
- %User Startup%\EPUHelp.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_RAMDO.JER. 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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