BKDR_ANDROM.XXD
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor 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
Arrival Details
This backdoor 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 backdoor creates the following folders:
- %User Temp%\$inst
- %Program Files%\-
- %Program Files%\-\Mail Attachment
(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.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
Other System Modifications
This backdoor deletes the following files:
- %User Temp%\$inst\0.tmp
- %User Temp%\$inst\1.tmp
- %User Temp%\$inst\3.tmp
- %User Temp%\$inst\4.tmp
- %User Temp%\$inst\5.tmp
- %User Temp%\$inst\6.tmp
- %User Temp%\$inst\7.tmp
- %User Temp%\$inst\8.tmp
- %User Temp%\$inst\9.tmp
- %User Temp%\$inst\10.tmp
- %User Temp%\$inst\11.tmp
- %User Temp%\$inst\12.tmp
- %User Temp%\$inst\13.tmp
- %User Temp%\$inst\14.tmp
- %User Temp%\$inst\15.tmp
- %User Temp%\$inst\16.tmp
- %User Temp%\$inst\17.tmp
- %User Temp%\$inst\20.tmp
- %User Temp%\$inst\50.tmp
- %User Temp%\$inst\21.tmp
- %User Temp%\$inst\51.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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
DisplayName = "Mail Attachment 3.4.5"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
DisplayVersion = "3.4.5"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
VersionMajor = "3"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
VersionMinor = "4"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
Publisher = "-"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
DisplayIcon = "%Program Files%\-\Mail Attachment\Uninstall.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
UninstallString = "%Program Files%\-\Mail Attachment\Uninstall.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
InstallLocation = "%Program Files%\-\Mail Attachment"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
InstallDate = "20150813"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
Language = "419"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
EstimatedSize = "1e9"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
NoModify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Mail Attachment 3.4.5
NoRepair = "1"
Dropping Routine
This backdoor drops the following files:
- %User Temp%\$inst\2.tmp
- %User Temp%\$inst\temp_0.tmp
- %User Temp%\explore.exe
(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.)
This report is generated via an automated analysis system.
SOLUTION
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
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\Windows\CurrentVersion\Uninstall
- Mail Attachment 3.4.5
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- DisplayName = "Mail Attachment 3.4.5"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- DisplayVersion = "3.4.5"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- VersionMajor = "3"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- VersionMinor = "4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- Publisher = "-"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- DisplayIcon = "%Program Files%\-\Mail Attachment\Uninstall.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- UninstallString = "%Program Files%\-\Mail Attachment\Uninstall.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- InstallLocation = "%Program Files%\-\Mail Attachment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- InstallDate = "20150813"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- Language = "419"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- EstimatedSize = "1e9"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- NoModify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Mail Attachment 3.4.5
- NoRepair = "1"
Step 4
Search and delete these components
- %User Temp%\$inst\2.tmp
- %User Temp%\$inst\temp_0.tmp
- %User Temp%\explore.exe
Step 5
Search and delete these folders
- %User Temp%\$inst
- %Program Files%\-
- %Program Files%\-\Mail Attachment
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_ANDROM.XXD. 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 this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Temp%\$inst\0.tmp
- %User Temp%\$inst\1.tmp
- %User Temp%\$inst\3.tmp
- %User Temp%\$inst\4.tmp
- %User Temp%\$inst\5.tmp
- %User Temp%\$inst\6.tmp
- %User Temp%\$inst\7.tmp
- %User Temp%\$inst\8.tmp
- %User Temp%\$inst\9.tmp
- %User Temp%\$inst\10.tmp
- %User Temp%\$inst\11.tmp
- %User Temp%\$inst\12.tmp
- %User Temp%\$inst\13.tmp
- %User Temp%\$inst\14.tmp
- %User Temp%\$inst\15.tmp
- %User Temp%\$inst\16.tmp
- %User Temp%\$inst\17.tmp
- %User Temp%\$inst\20.tmp
- %User Temp%\$inst\50.tmp
- %User Temp%\$inst\21.tmp
- %User Temp%\$inst\51.tmp
Did this description help? Tell us how we did.