TROJ_MALEX.EA
Windows 2000, Windows XP, Windows 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
410,112 bytes
EXE
No
19 Dec 2013
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:
- %Program Files%\Common Files\Microsoft Shared\DAO\svchost.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).)
It creates the following folders:
- %System Root%\fc19c7ae22fe16133886011bcc3ca66a433f
- %User Profile%\Microsoft\AddIns
- %User Profile%\AddIns\InternalLog
- %User Profile%\InternalLog\D41D8CD98F00B204E9800998ECF8427E
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP70
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP71
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP72
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP73
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP74
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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 modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
RFC1156Agent\CurrentVersion\Parameters
TrapPollTimeMilliSecs = "3a98"
(Note: The default value data of the said registry entry is 3a98.)
Dropping Routine
This Trojan drops the following files:
- %Program Files%\Common Files\Microsoft Shared\DAO\rnt1.inf
- %Temp%\CabTmp_01_01
- %Temp%\CabTmp_01_02
- %Temp%\CabTmp_01_03
- %Temp%\CabTmp_01_04
- %Temp%\CabTmp_01_05
- %Temp%\CabTmp_01_06
- %Temp%\CabTmp_01_07
- %User Profile%\RP71\netstatan.txt.cab
- %Temp%\CabTmp_01_08
- %Temp%\CabTmp_01_09
- %Temp%\CabTmp_01_0A
- %User Profile%\RP71\20131125145224.lck
- %Temp%\CabTmp_02_01
- %Temp%\CabTmp_02_02
- %Temp%\CabTmp_02_03
- %Temp%\CabTmp_02_04
- %Temp%\CabTmp_02_05
- %Temp%\CabTmp_02_06
- %Temp%\CabTmp_02_07
- %User Profile%\RP71\sysinfo.txt.cab
- %Temp%\CabTmp_02_08
- %Temp%\CabTmp_02_09
- %Temp%\CabTmp_02_0A
- %User Profile%\RP71\20131125145237.lck
- %Temp%\CabTmp_03_01
- %Temp%\CabTmp_03_02
- %Temp%\CabTmp_03_03
- %Temp%\CabTmp_03_04
- %Temp%\CabTmp_03_05
- %Temp%\CabTmp_03_06
- %Temp%\CabTmp_03_07
- %User Profile%\RP71\tasklist.txt.cab
- %Temp%\CabTmp_03_08
- %Temp%\CabTmp_03_09
- %Temp%\CabTmp_03_0A
- %User Profile%\RP71\20131125145242.lck
- %Temp%\CabTmp_04_01
- %Temp%\CabTmp_04_02
- %Temp%\CabTmp_04_03
- %Temp%\CabTmp_04_04
- %Temp%\CabTmp_04_05
- %Temp%\CabTmp_04_06
- %Temp%\CabTmp_04_07
- %Temp%\CabTmp_04_08
- %Temp%\CabTmp_04_09
- %Temp%\CabTmp_04_0A
- %User Profile%\RP71\20131125145247.lck
- %Temp%\CabTmp_05_01
- %Temp%\CabTmp_05_02
- %Temp%\CabTmp_05_03
- %Temp%\CabTmp_05_04
- %Temp%\CabTmp_05_05
- %Temp%\CabTmp_05_06
- %Temp%\CabTmp_05_07
- %User Profile%\RP71\dirlistA.txt.cab
- %Temp%\CabTmp_05_08
- %Temp%\CabTmp_05_09
- %Temp%\CabTmp_05_0A
- %User Profile%\RP71\20131125145252.lck
- %Temp%\CabTmp_06_01
- %Temp%\CabTmp_06_02
- %Temp%\CabTmp_06_03
- %Temp%\CabTmp_06_04
- %Temp%\CabTmp_06_05
- %Temp%\CabTmp_06_06
- %Temp%\CabTmp_06_07
- %User Profile%\RP71\dirlistC.txt.cab
- %Temp%\CabTmp_06_08
- %Temp%\CabTmp_06_09
- %Temp%\CabTmp_06_0A
- %User Profile%\RP71\20131125145320.lck
- %Temp%\CabTmp_07_01
- %Temp%\CabTmp_07_02
- %Temp%\CabTmp_07_03
- %Temp%\CabTmp_07_04
- %Temp%\CabTmp_07_05
- %Temp%\CabTmp_07_06
- %Temp%\CabTmp_07_07
- %User Profile%\RP71\dirlistD.txt.cab
- %Temp%\CabTmp_07_08
- %Temp%\CabTmp_07_09
- %Temp%\CabTmp_07_0A
- %User Profile%\RP71\20131125145322.lck
- %User Profile%\InternalLog\slv_ps.inf
- %User Profile%\RP71\netstatan.txt
- %User Profile%\RP71\sysinfo.txt
- %User Profile%\RP71\tasklist.txt
- %User Profile%\RP71\dirlistA.txt
- %User Profile%\RP71\dirlistC.txt
- %User Profile%\RP71\dirlistD.txt
(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).. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.. %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
9.300
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
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RFC1156Agent\CurrentVersion\Parameters
- From: TrapPollTimeMilliSecs = "3a98"
To: TrapPollTimeMilliSecs = ""3a98""
- From: TrapPollTimeMilliSecs = "3a98"
Step 3
Search and delete these components
- %Program Files%\Common Files\Microsoft Shared\DAO\rnt1.inf
- %Temp%\CabTmp_01_01
- %Temp%\CabTmp_01_02
- %Temp%\CabTmp_01_03
- %Temp%\CabTmp_01_04
- %Temp%\CabTmp_01_05
- %Temp%\CabTmp_01_06
- %Temp%\CabTmp_01_07
- %User Profile%\RP71\netstatan.txt.cab
- %Temp%\CabTmp_01_08
- %Temp%\CabTmp_01_09
- %Temp%\CabTmp_01_0A
- %User Profile%\RP71\20131125145224.lck
- %Temp%\CabTmp_02_01
- %Temp%\CabTmp_02_02
- %Temp%\CabTmp_02_03
- %Temp%\CabTmp_02_04
- %Temp%\CabTmp_02_05
- %Temp%\CabTmp_02_06
- %Temp%\CabTmp_02_07
- %User Profile%\RP71\sysinfo.txt.cab
- %Temp%\CabTmp_02_08
- %Temp%\CabTmp_02_09
- %Temp%\CabTmp_02_0A
- %User Profile%\RP71\20131125145237.lck
- %Temp%\CabTmp_03_01
- %Temp%\CabTmp_03_02
- %Temp%\CabTmp_03_03
- %Temp%\CabTmp_03_04
- %Temp%\CabTmp_03_05
- %Temp%\CabTmp_03_06
- %Temp%\CabTmp_03_07
- %User Profile%\RP71\tasklist.txt.cab
- %Temp%\CabTmp_03_08
- %Temp%\CabTmp_03_09
- %Temp%\CabTmp_03_0A
- %User Profile%\RP71\20131125145242.lck
- %Temp%\CabTmp_04_01
- %Temp%\CabTmp_04_02
- %Temp%\CabTmp_04_03
- %Temp%\CabTmp_04_04
- %Temp%\CabTmp_04_05
- %Temp%\CabTmp_04_06
- %Temp%\CabTmp_04_07
- %Temp%\CabTmp_04_08
- %Temp%\CabTmp_04_09
- %Temp%\CabTmp_04_0A
- %User Profile%\RP71\20131125145247.lck
- %Temp%\CabTmp_05_01
- %Temp%\CabTmp_05_02
- %Temp%\CabTmp_05_03
- %Temp%\CabTmp_05_04
- %Temp%\CabTmp_05_05
- %Temp%\CabTmp_05_06
- %Temp%\CabTmp_05_07
- %User Profile%\RP71\dirlistA.txt.cab
- %Temp%\CabTmp_05_08
- %Temp%\CabTmp_05_09
- %Temp%\CabTmp_05_0A
- %User Profile%\RP71\20131125145252.lck
- %Temp%\CabTmp_06_01
- %Temp%\CabTmp_06_02
- %Temp%\CabTmp_06_03
- %Temp%\CabTmp_06_04
- %Temp%\CabTmp_06_05
- %Temp%\CabTmp_06_06
- %Temp%\CabTmp_06_07
- %User Profile%\RP71\dirlistC.txt.cab
- %Temp%\CabTmp_06_08
- %Temp%\CabTmp_06_09
- %Temp%\CabTmp_06_0A
- %User Profile%\RP71\20131125145320.lck
- %Temp%\CabTmp_07_01
- %Temp%\CabTmp_07_02
- %Temp%\CabTmp_07_03
- %Temp%\CabTmp_07_04
- %Temp%\CabTmp_07_05
- %Temp%\CabTmp_07_06
- %Temp%\CabTmp_07_07
- %User Profile%\RP71\dirlistD.txt.cab
- %Temp%\CabTmp_07_08
- %Temp%\CabTmp_07_09
- %Temp%\CabTmp_07_0A
- %User Profile%\RP71\20131125145322.lck
- %User Profile%\InternalLog\slv_ps.inf
- %User Profile%\RP71\netstatan.txt
- %User Profile%\RP71\sysinfo.txt
- %User Profile%\RP71\tasklist.txt
- %User Profile%\RP71\dirlistA.txt
- %User Profile%\RP71\dirlistC.txt
- %User Profile%\RP71\dirlistD.txt
Step 4
Search and delete these folders
- %System Root%\fc19c7ae22fe16133886011bcc3ca66a433f
- %User Profile%\Microsoft\AddIns
- %User Profile%\AddIns\InternalLog
- %User Profile%\InternalLog\D41D8CD98F00B204E9800998ECF8427E
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP70
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP71
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP72
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP73
- %User Profile%\D41D8CD98F00B204E9800998ECF8427E\RP74
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_MALEX.EA. 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.
Did this description help? Tell us how we did.