TROJ_ZCLICK.YYJC
PWS:Win32/Zbot (Microsoft); Trojan-Spy.Win32.Zbot.umid (Kaspersky); Trojan.Zbot (Symantec)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes itself after execution.
TECHNICAL DETAILS
301,299 bytes
EXE
29 Oct 2014
Arrival Details
This Trojan 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 Trojan drops the following copies of itself into the affected system:
- %Application Data%\{random foldername}\{random filename 1}.exe
- %System%\{random filename 2}.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random} = "%Application Data%\{random foldername}\{random filename 1}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%Application Data%\{random foldername}\{random filename 1}.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
HKEY_CURRENT_USER\SOFTWARE\{random key 1}
HKEY_LOCAL_MACHINE\SOFTWARE\{random key 2}
HKEY_CURRENT_USER\SOFTWARE\{random key 2}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\{random key 1}
License = "444"
HKEY_CURRENT_USER\Software\{random key 1}
License = "444"
HKEY_LOCAL_MACHINE\SOFTWARE\{random key 2}
Tasks = "{hex values}"
HKEY_CURRENT_USER\Software\{random key 2}
Tasks = "{hex values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
{random filename 1}.exe = "11001"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{random number 1}
DisplayName = "Security Center Server - {random number 1}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{random number 1}
ImagePath = "%Windows%\Tasks\Security Center Update - {random number 1}.job"
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot
Dropping Routine
This Trojan drops the following files:
- %Windows%\Tasks\Security Center Update - {random number 1}.job
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}pyallow.su/
- http://{BLOCKED}madeeasy.su
- http://{BLOCKED}ydaypp.ru/
- http://{BLOCKED}urmansk.su/
- http://{BLOCKED}enpiano.ru/
- http://{BLOCKED}redtired.com/
It deletes itself after execution.