BKDR_KULUOZ.BME
TrojanDownloader:Win32/Kuluoz.D (Microsoft); Net-Worm.Win32.Aspxor.bpza (Kaspersky)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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.
It executes commands from a remote malicious user, effectively compromising the affected system.
It retrieves specific information from the affected system.
TECHNICAL DETAILS
133,632 bytes
EXE
Yes
16 Jul 2014
Compromises system security, Collects system information
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 and executes them:
- %AppDataLocal%\{random}.exe
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista and 7.)
It adds the following processes:
- svchost.exe
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- 2GVWNQJz1
It injects itself into the following processes as part of its memory residency routine:
- created svchost.exe
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random} = "%AppDataLocal%\{random}.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\SOFTWARE\{random}
It adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\SOFTWARE\{random}
{random} = "{hex values}"
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- idl - sleep/idle
- run - download and execute arbitrary file
- rem - uninstall itself
- rdl - update copy of injected code in svchost and add encrypted code to registry
- upd - update copy of main malware
- red - edit registry
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}.{BLOCKED}.17.8:8080
- {BLOCKED}.{BLOCKED}.249.45:8080
- {BLOCKED}.{BLOCKED}.122.67:443
- {BLOCKED}.{BLOCKED}.255.11:8080
- {BLOCKED}.{BLOCKED}.120.163:8080
- {BLOCKED}.{BLOCKED}.50.228:443
- {BLOCKED}.{BLOCKED}.166.12:443
- {BLOCKED}.{BLOCKED}.222.24:8080
- {BLOCKED}.{BLOCKED}.180.148:8080
- {BLOCKED}.{BLOCKED}.211.16:443
Information Theft
This backdoor retrieves the following information from the affected system:
- Malware Version
- Virtualization Information
- Running Debugger/Forensic Tools
- User name
- Processor type
- OS version
- Antivirus product
- Firewall product
NOTES:
This malware checks if there is a running window with the following name:
- wireshark.exe
- Tfrmrpcap
- iptools.exe
- Iris - Version 5.59
- ProcessLasso_Notification_Class
- TSystemExplorerTrayForm.UnicodeClass
- PROCMON_WINDOW_CLASS
- PROCEXPL
- WdcWindow
- ProcessHacker
- 99929D61-1338-48B1-9433-D42A1D94F0D2-x64
- 99929D61-1338-48B1-9433-D42A1D94F0D2-x32
- 99929D61-1338-48B1-9433-D42A1D94F0D2
- Dumper
- Dumper64
- APISpy32Class
- VMwareDragDetWndClass
- VMwareSwitchUserControlClass
- vmtoolsd.exe
- prl_cc.exe
- prl_tools.exe
- SharedIntApp.exe
- VBoxTray.exe
- VBoxService.exe
- vmusrvc.exe
- vmsrvc.exe
It checks for the following Service Disk or BIOS related registry information to check if it is running under virtualization:
- VMWare
- PTLTD
- Virtual
- PRLS
- Vbox
- AMIBI
It checks if the following registry keys exist:
- SYSTEM\CurrentControlSet\Enum\PCI\VEN_15AD&DEV_0774&SUBSYS_040515AD&REV_00
- SYSTEM\CurrentControlSet\Enum\PCI\VEN_15AD&DEV_0774&SUBSYS_074015AD&REV_00
- SYSTEM\CurrentControlSet\Enum\PCI\VEN_80EE&DEV_CAFE&SUBSYS_00000000&REV_00
- SYSTEM\CurrentControlSet\Enum\PCI\VEN_5333&DEV_8811&SUBSYS_00000000&REV_00
- SYSTEM\CurrentControlSet\Enum\PCI\VEN_80EE&DEV_BEEF&SUBSYS_00000000&REV_00
- HARDWARE\ACPI\DSDT\PTLTD__
- HARDWARE\ACPI\DSDT\VBOX__
- HARDWARE\ACPI\DSDT\AMIBI
SOLUTION
9.700
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Scan your computer with your Trend Micro product and note files detected as BKDR_KULUOZ.BME
Step 4
Restart in Safe Mode
Step 5
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\Microsoft\Windows\CurrentVersion\Run
- {random} = "%AppDataLocal%\{random}.exe"
- {random} = "%AppDataLocal%\{random}.exe"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_KULUOZ.BME. 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
The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.
- In HKEY_CURRENT_USER\SOFTWARE
- {random}
- {random}
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