BKDR_HANCITOR.BYX
Trojan:Win32/Dynamer!ac (Microsoft), W32/Cutwail.AJ (exact) (FPROT)
Windows
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware
This backdoor gathers information and reports it to its servers.
TECHNICAL DETAILS
66,560 bytes
Yes
16 Jun 2017
Connects to URLs/IPs
Arrival Details
This backdoor may be downloaded from the following remote sites:
- http://{BLOCKED}.{BLOCKED}.55.160/js/c09m.exe
- http://{BLOCKED}mails.info/scripts/c09m.exe
- ip: {BLOCKED}.{BLOCKED}.187.10
Installation
This backdoor drops and executes the following files:
- %Temp%\{random value}.tmp -> drops copy %System%\WinHost32.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It drops the following copies of itself into the affected system:
- %System%\{random values}.exe
- %User Profile%\{random values}.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.)
It injects codes into the following process(es):
- svchost.exe
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random value} = "%System%\{random values}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
WinHost32 = "%System%\WinHost32.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random value} = "%User Profile%\{random values}.exe"
Other System Modifications
This backdoor adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\WinNTData
prx = "{hex}"
Backdoor Routine
This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}meand.com/sl/gate.php
- http://{BLOCKED}eidund.ru/sl/gate.php
- http://{BLOCKED}sron.ru/slgate.php
Download Routine
This backdoor accesses the following websites to download files:
- http://{BLOCKED}lou.com/88.exe
Other Details
This backdoor connects to the following URL(s) to get the affected system's IP address:
- api.ipify.org
It gathers the following information and reports it to its servers:
- OS Version
- IP Address
- Machine GUID
The information are posted to the server in the following format: GUID={machine guid}&BUILD=&INFO={info}&IP={IP address}&TYPE=1&WIN={OS version}
SOLUTION
9.800
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
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random value} = "%System%\{random values}.exe"
- {random value} = "%System%\{random values}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- WinHost32 = "%System%\WinHost32.exe"
- WinHost32 = "%System%\WinHost32.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random value} = "%User Profile%\{random values}.exe"
- {random value} = "%User Profile%\{random values}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\WinNTData
- prx = "{hex}"
- prx = "{hex}"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_HANCITOR.BYX. 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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