TROJ_AGENT_050657.TOMB
PWS:Win32/Zbot.gen!AK (Microsoft); PWS-Zbot.gen.aln (McAfee); Packed.Generic.362 (Symantec); Trojan-Spy.Win32.Zbot.ghud (Kaspersky); Trojan.Win32.Reveto.Ac (v) (Sunbelt); Gen:Variant.TDss.79 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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
347,408 bytes
EXE
Yes
14 Dec 2012
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 creates the following folders:
- %User Profile%\Application Data\Vipuze
(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 Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Vipuze\qizyo.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
2g6670j1 = "0JFIaGEkszpkFzkavjg=?_CHAR(0x06)_?"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
2b9e028j = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
2b9e028j = "qJEmaA==?"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
12798:UDP = "12798:UDP:*:Enabled:UDP 12798"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
27255:TCP = "27255:TCP:*:Enabled:TCP 27255"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
197i155j = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
300698da = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
25d15bd2 = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
25d15bd2 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
2e60501b = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
16a7i750 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
2i1f26a9 = "YjWOOA==_CHAR(0x16)__CHAR(0x03)_?_CHAR(0x0C)_?E?E"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
300698da = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = "1"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Atjobe
2b9e028j = "6JEmaA=="
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"
It modifies the following registry entries:
HKEY_CURRENT_USER\Identities
Last Username = "Main Identity"
(Note: The default value data of the said registry entry is Main Identity.)
HKEY_CURRENT_USER\Identities
Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
(Note: The default value data of the said registry entry is {C0FE0177-5693-4537-9331-A7402AD82D40}.)
HKEY_CURRENT_USER\Identities
Identity Login = "9853"
(Note: The default value data of the said registry entry is 98053.)
HKEY_CURRENT_USER\Identities
Identity Ordinal = "2"
(Note: The default value data of the said registry entry is 1.)
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\Vipuze
- %User Profile%\Vipuze\qizyo.exe
- %Application Data%\axurw.zep
(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.. %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 Trojan deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Restart in Safe Mode
Step 3
Delete this registry key
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
- Atjobe
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
- {58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Vipuze\qizyo.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 2g6670j1 = "0JFIaGEkszpkFzkavjg=?_CHAR(0x06)_?"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 2b9e028j = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 2b9e028j = "qJEmaA==?"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- 12798:UDP = "12798:UDP:*:Enabled:UDP 12798"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- 27255:TCP = "27255:TCP:*:Enabled:TCP 27255"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 197i155j = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 300698da = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 25d15bd2 = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 25d15bd2 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 2e60501b = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 16a7i750 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 2i1f26a9 = "YjWOOA==_CHAR(0x16)__CHAR(0x03)_?_CHAR(0x0C)_?E?E"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 300698da = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Server ID = "4"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- FirstRun = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- OlkContactRefresh = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- OlkFolderRefresh = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Atjobe
- 2b9e028j = "6JEmaA=="
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- %System%\advapi32.dll[MofResourceName] = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- %System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
- %System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"
Step 5
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\Identities
- From: Last Username = "Main Identity"
To: Last Username = ""Main Identity""
- From: Last Username = "Main Identity"
- In HKEY_CURRENT_USER\Identities
- From: Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
To: Last User ID = ""{C0FE0177-5693-4537-9331-A7402AD82D40}""
- From: Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
- In HKEY_CURRENT_USER\Identities
- From: Identity Login = "9853"
To: Identity Login = ""98053""
- From: Identity Login = "9853"
- In HKEY_CURRENT_USER\Identities
- From: Identity Ordinal = "2"
To: Identity Ordinal = ""1""
- From: Identity Ordinal = "2"
Step 6
Search and delete these components
- %User Profile%\Application Data\Vipuze
- %User Profile%\Vipuze\qizyo.exe
- %Application Data%\axurw.zep
Step 7
Search and delete this folder
- %User Profile%\Application Data\Vipuze
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_050657.TOMB. 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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