ALIASES:

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)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size: 117,760 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 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

Minimum Scan Engine: 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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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

[ Learn More ]

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

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %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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