BKDR_KELIHOS.YVB
Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Atros.BPUL (AVG)
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.
TECHNICAL DETAILS
1,058,888 bytes
EXE
No
09 Jul 2015
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
- %User Profile%\Application Data\dyGoXwP
- %User Profile%\Application Data\aMLBWPG
(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 Profile%\MetaData\696F3DE637E6DE85B458996D49D759AD
- %User Profile%\Content\696F3DE637E6DE85B458996D49D759AD
- %User Profile%\MetaData\7396C420A8E1BC1DA97F1AF0D10BAD21
- %User Profile%\Content\7396C420A8E1BC1DA97F1AF0D10BAD21
- %User Profile%\dyGoXwP\4016900e408043debe45667d85d15ea1
- %User Profile%\dyGoXwP\345051d18feb43dbac5cb77c5585510e
- %User Profile%\aMLBWPG\RrVdiA.exe
- %User Startup%\aMLBWPG.url
- %User Profile%\dyGoXwP\8c14d075caea4efaa07e835dafff7844
- %User Profile%\dyGoXwP\f117f21718a8437ea3f3caa870efbdee
- %User Profile%\dyGoXwP\e928459beb724801a3279475d4905880
- %User Profile%\dyGoXwP\663fbb6373fd4f60a8a07f6c9ba9f228
- %User Profile%\dyGoXwP\c05d48f0c68346f3b17018d945381e5f
- %User Temp%\tmpF.tmp
- %User Temp%\tmp13.tmp
- %User Temp%\tmp17.tmp
(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.. %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 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.)
Other Details
This backdoor connects to the following possibly malicious URL:
- {BLOCKED}5.24.171
- {BLOCKED}8.141.75
- {BLOCKED}.62.201
- {BLOCKED}6.112.172
- {BLOCKED}.248.178
- {BLOCKED}.22.108
This report is generated via an automated analysis system.
SOLUTION
9.750
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 Profile%\MetaData\696F3DE637E6DE85B458996D49D759AD
- %User Profile%\Content\696F3DE637E6DE85B458996D49D759AD
- %User Profile%\MetaData\7396C420A8E1BC1DA97F1AF0D10BAD21
- %User Profile%\Content\7396C420A8E1BC1DA97F1AF0D10BAD21
- %User Profile%\dyGoXwP\4016900e408043debe45667d85d15ea1
- %User Profile%\dyGoXwP\345051d18feb43dbac5cb77c5585510e
- %User Profile%\aMLBWPG\RrVdiA.exe
- %User Startup%\aMLBWPG.url
- %User Profile%\dyGoXwP\8c14d075caea4efaa07e835dafff7844
- %User Profile%\dyGoXwP\f117f21718a8437ea3f3caa870efbdee
- %User Profile%\dyGoXwP\e928459beb724801a3279475d4905880
- %User Profile%\dyGoXwP\663fbb6373fd4f60a8a07f6c9ba9f228
- %User Profile%\dyGoXwP\c05d48f0c68346f3b17018d945381e5f
- %User Temp%\tmpF.tmp
- %User Temp%\tmp13.tmp
- %User Temp%\tmp17.tmp
Step 3
Search and delete these folders
- %User Profile%\CryptnetUrlCache\MetaData
- %User Profile%\Microsoft\CryptnetUrlCache
- %User Profile%\CryptnetUrlCache\Content
- %User Profile%\Application Data\dyGoXwP
- %User Profile%\Application Data\aMLBWPG
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_KELIHOS.YVB. 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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