TROJ_AGENT_054031.TOMB
PWS:Win32/Zbot.gen!AM (Microsoft); PWS-Zbot-FATG!F275F2650753 (McAfee); Trojan.Zbot (Symantec); Trojan-Spy.Win32.Zbot.kbns (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); ERROR (FSecure); Trojan horse PSW.Generic10.CPFC (AVG)
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.
TECHNICAL DETAILS
404,992 bytes
EXE
Yes
17 May 2013
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\Tojay
(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%\Tojay\enufto.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Zayf
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Zayf
9185292 = "rBmaVUfw0MWmLg==?_CHAR(0x05)_?"
HKEY_CURRENT_USER\Software\Microsoft\
Zayf
cccdb6g = "{random values}"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
26859:UDP = "26859:UDP:*:Enabled:UDP 26859"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
28276:TCP = "28276:TCP:*:Enabled:TCP 28276"
HKEY_CURRENT_USER\Software\Microsoft\
Zayf
1ee56h7g = "JHH7VUCeuMWULsuk_CHAR(0x05)_re?r?red."
HKEY_CURRENT_USER\Software\Microsoft\
Zayf
47d5dh1 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\Tojay
- %User Profile%\Tojay\enufto.exe
- %Application Data%\opawx.ymr
(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.)
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
- Zayf
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%\Tojay\enufto.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Zayf
- 9185292 = "rBmaVUfw0MWmLg==?_CHAR(0x05)_?"
- In HKEY_CURRENT_USER\Software\Microsoft\Zayf
- cccdb6g = "{random values}"
- 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
- 26859:UDP = "26859:UDP:*:Enabled:UDP 26859"
- 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
- 28276:TCP = "28276:TCP:*:Enabled:TCP 28276"
- In HKEY_CURRENT_USER\Software\Microsoft\Zayf
- 1ee56h7g = "JHH7VUCeuMWULsuk_CHAR(0x05)_re?r?red."
- In HKEY_CURRENT_USER\Software\Microsoft\Zayf
- 47d5dh1 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Server ID = "4"
Step 5
Search and delete these components
- %User Profile%\Application Data\Tojay
- %User Profile%\Tojay\enufto.exe
- %Application Data%\opawx.ymr
Step 6
Search and delete this folder
- %User Profile%\Application Data\Tojay
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_054031.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.
Did this description help? Tell us how we did.