BKDR_CEESECT.A
TrojanSpy:MSIL/Tzeebot (Microsoft), Trojan-Cleaver (McAfee), Backdoor.Setoba (Symantec), MSIL/Spy.TzeeBot.D (ESET)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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
Varies
EXE
Yes
10 Dec 2015
Compromises system security
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 drops the following copies of itself into the affected system:
- %Program Files%\Common Files\Services\COM+ Extention Service\csext.exe
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
It creates the following folders:
- %Program Files%\Common Files\Services\COM+ Extention Service
(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)
Autostart Technique
This backdoor registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\COM+ System Extensions
Description = "Provides a common interface and extention module to access, management and use any services that explicitly depend on Component Object Model (COM)+-based."
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\COM+ System Extensions
DisplayName = "COM+ System Extentions"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\COM+ System Extensions
ImagePath = "{malware path and filename}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\COM+ System Extensions
Start = "2"
It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\COM+ System Extensions
NOTES:
It connects to www.{BLOCKED}1.com at Port 80 and starts a remote shell every 3:02pm. The remote shell session is terminated at 3:03pm.
SOLUTION
9.750
11.334.03
10 Dec 2015
11.335.00
11 Dec 2015
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
Identify and terminate files detected as BKDR_CEESECT.A
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- COM+ System Extensions
- COM+ System Extensions
Step 4
Search and delete this folder
- %Program Files%\Common Files\Services\COM+ Extention Service
Step 5
Scan your computer with your Trend Micro product to delete files detected as BKDR_CEESECT.A. 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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