BKDR_PUSHDO.FT
Backdoor.Win32.Pushdo.qny (Kaspersky), TrojanDownloader:Win32/Cutwail.BS (Microsoft), Trojan-Downloader.Win32.Cutwail (Ikarus), W32/Pushdo.YOY!tr (Fortinet)
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:
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 adds the following folders:
- %Application Data%\Microsoft\Crypto
- %Application Data%\Microsoft\Crypto\RSA
- %Application Data%\Microsoft\Crypto\RSA\{random folder name}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It drops the following copies of itself into the affected system:
- %User Profile%\{malware file name}
(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 backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "%User Profile%\{malware file name}"
Other System Modifications
This backdoor adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
AppManagement = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
{malware file name} = "{random values}"
Dropping Routine
This backdoor drops the following files:
- %Application Data%\Microsoft\Crypto\RSA\{random folder name}\{random}
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}jovop.kz
- http://{BLOCKED}usea.kz
- http://{BLOCKED}shogz.kz
- http://{BLOCKED}azofix.kz
- http://{BLOCKED}nefim.kz
- http://{BLOCKED}ncewiz.kz
- http://{BLOCKED}vuz.kz
- http://{BLOCKED}uwecb.kz
- http://{BLOCKED}lof.kz
- http://{BLOCKED}eopidu.kz
- http://{BLOCKED}uzw.kz
- http://{BLOCKED}hea.kz
- http://{BLOCKED}qsurco.kz
- http://{BLOCKED}alqu.kz
- http://{BLOCKED}t.net
- http://{BLOCKED}duqv.kz
- http://{BLOCKED}eifove.kz
- http://{BLOCKED}ufvib.kz
- http://{BLOCKED}dav.kz
- http://{BLOCKED}qogl.kz
- http://{BLOCKED}kurm.kz
- http://{BLOCKED}udo.kz
- http://{BLOCKED}ihug.kz
- http://{BLOCKED}nadj.kz
- http://{BLOCKED}curc.kz
- http://{BLOCKED}jososx.kz
- http://{BLOCKED}ebhoh.kz
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
Scan your computer with your Trend Micro product and note files detected as BKDR_PUSHDO.FT
Step 3
Restart in Safe Mode
Step 4
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
- {malware file name} = "%User Profile%\{malware file name}"
- {malware file name} = "%User Profile%\{malware file name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- AppManagement = "{random values}"
- AppManagement = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- {malware file name} = "{random values}"
- {malware file name} = "{random values}"
Step 5
Search and delete this folder
- %Application Data%\Microsoft\Crypto
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PUSHDO.FT. 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.
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