BKDR_ETUMBOT.BFK
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
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.
It deletes itself after execution.
TECHNICAL DETAILS
118,784 bytes
EXE
No
01 Nov 2016
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 creates the following folders:
- %User Profile%\CryptnetUrlCache\MetaData
- %User Profile%\Microsoft\CryptnetUrlCache
- %User Profile%\CryptnetUrlCache\Content
(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.)
Dropping Routine
This backdoor drops the following files:
- %User Temp%\winshfhc.exe
- %System Root%\008C8402661FE31E6932046B6377E64.docx
- %User Temp%\v~bxs.tmp
- %User Startup%\GoogleUpdate.lnk
- %User Profile%\MetaData\2BF68F4714092295550497DD56F57004
- %User Profile%\Content\2BF68F4714092295550497DD56F57004
- %User Profile%\MetaData\94308059B57B3142E455B38A6EB92015
- %User Profile%\Content\94308059B57B3142E455B38A6EB92015
- %User Temp%\CabC.tmp
- %User Temp%\TarE.tmp
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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 Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.. %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.)
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}65.193/main.aspx/113333648=13398.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=15894.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=17070.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=16730.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=31830.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=9901.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=22585.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=711.link?{random characters}
- http://{BLOCKED}65.193/news.aspx/113333648=11320.link?{random characters}
- 52.40.65.193
- 8.253.129.249
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.8
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
Search and delete these components
- %User Temp%\winshfhc.exe
- %System Root%\008C8402661FE31E6932046B6377E64.docx
- %User Temp%\v~bxs.tmp
- %User Startup%\GoogleUpdate.lnk
- %User Profile%\MetaData\2BF68F4714092295550497DD56F57004
- %User Profile%\Content\2BF68F4714092295550497DD56F57004
- %User Profile%\MetaData\94308059B57B3142E455B38A6EB92015
- %User Profile%\Content\94308059B57B3142E455B38A6EB92015
- %User Temp%\CabC.tmp
- %User Temp%\TarE.tmp
Step 3
Search and delete these folders
- %User Profile%\CryptnetUrlCache\MetaData
- %User Profile%\Microsoft\CryptnetUrlCache
- %User Profile%\CryptnetUrlCache\Content
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_ETUMBOT.BFK. 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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