BKDR_ANDROM.JU
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
882,800 bytes
EXE
No
05 Aug 2016
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 drops the following copies of itself into the affected system:
- %User Temp%\FolderN\name.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.)
It creates the following folders:
- %User Temp%\FolderN
- %User Profile%\Application Data\Monitor
- %Program Files%\myluminosity
- %User Profile%\Monitor\Logs
- %User Profile%\Monitor\Files
- %User Profile%\Monitor\Guard
(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.. %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.. %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%\ svhost.exe
- %User Temp%\FolderN\name.exe:Zone.Identifier
- %User Startup%\name.exe:Zone.Identifier
(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.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software
pMOkIpGeKsMATtez1JL3Ig== = "Iz+XEZ/4W8F+dunNi7bB/fgixlbP5sljyGM9RT9q41Y="
HKEY_CURRENT_USER\Software
lNl3jcC0JoDPd6vrm52/Ww== = "HbFxHkIrkh+eqE8XWObO+A=="
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%User Temp%\FolderN\name.exe"
Dropping Routine
This backdoor drops the following files:
- %User Profile%\Guard\1
(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.)
Other Details
This backdoor connects to the following possibly malicious URL:
- {BLOCKED}4.126.152
This report is generated via an automated analysis system.
SOLUTION
9.8
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 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
- pMOkIpGeKsMATtez1JL3Ig== = "Iz+XEZ/4W8F+dunNi7bB/fgixlbP5sljyGM9RT9q41Y="
- In HKEY_CURRENT_USER\Software
- lNl3jcC0JoDPd6vrm52/Ww== = "HbFxHkIrkh+eqE8XWObO+A=="
Step 3
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_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- Load = "%User Temp%\FolderN\name.exe"
Step 4
Search and delete this file
- %User Profile%\Guard\1
Step 5
Search and delete these folders
- %User Temp%\FolderN
- %User Profile%\Application Data\Monitor
- %Program Files%\myluminosity
- %User Profile%\Monitor\Logs
- %User Profile%\Monitor\Files
- %User Profile%\Monitor\Guard
Step 6
Scan your computer with your Trend Micro product to delete files detected as BKDR_ANDROM.JU. 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%\ svhost.exe
- %User Temp%\FolderN\name.exe:Zone.Identifier
- %User Startup%\name.exe:Zone.Identifier
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