WORM_OTORUN.XXQQ
Trojan:Win32/Finodes.B (Microsoft); W32/Autorun.worm.ht (McAfee); Trojan.Gen.2 (Symantec); Worm.Win32.AutoRun.cxps (Kaspersky); Mal/Behav-043 (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Found Win32/DH{gRKBE3k2Aw9+ICIjJU4} (AVG)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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
117,760 bytes
EXE
Yes
15 Aug 2015
Arrival Details
This worm 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 worm drops the following copies of itself into the affected system:
- %User Profile%\Application Data\CacheMgr.exe
(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.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\2CBE016A-8F28-4E0C-83A6-6079161294D7
StubPath = "%User Profile%\Application Data\CacheMgr.exe -ax"
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\2CBE016A-8F28-4E0C-83A6-6079161294D7
It deletes the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\2CBE016A-8F28-4E0C-83A6-6079161294D7
Dropping Routine
This worm drops the following files:
- %User Temp%\cac2.tmp
- %User Temp%\cac5.tmp
- %User Temp%\cac8.tmp
- %User Temp%\cacB.tmp
- %User Temp%\cacE.tmp
- %User Temp%\cac11.tmp
(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.)
Other Details
This worm connects to the following possibly malicious URL:
- http://{BLOCKED}es.com/ABIUS/setup.exe
- {BLOCKED}.236.84
- {BLOCKED}4.120
This report is generated via an automated analysis system.
SOLUTION
9.750
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 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_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
- 2CBE016A-8F28-4E0C-83A6-6079161294D7
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\Active Setup\Installed Components\2CBE016A-8F28-4E0C-83A6-6079161294D7
- StubPath = "%User Profile%\Application Data\CacheMgr.exe -ax"
Step 5
Search and delete these components
- %User Temp%\cac2.tmp
- %User Temp%\cac5.tmp
- %User Temp%\cac8.tmp
- %User Temp%\cacB.tmp
- %User Temp%\cacE.tmp
- %User Temp%\cac11.tmp
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_OTORUN.XXQQ. 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 7
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components
- 2CBE016A-8F28-4E0C-83A6-6079161294D7
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