PUA_RUKOMETA.SMALY
Trojan.Gen (Symantec); Trojan.Win32.SelfDel.bffc (Kaspersky); Mal/LdMon-T (Sophos); Trojan.Win32.Generic!BT (Sunbelt)
Windows
Threat Type: Potentially Unwanted Application
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Potentially Unwanted Application 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
2,672,096 bytes
EXE
Yes
11 Jan 2020
Arrival Details
This Potentially Unwanted Application 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 Potentially Unwanted Application adds the following processes:
- %System%\cmd.exe /c taskkill /f /pid 3052 & for /l %x in (1,1,60) do ( ping 127.0.0.1 -n 2 -w 500 & del /q /f "{malware file path and name}" & if not exist "{malware file path and name}" ( exit ) )
- taskkill /f /pid 3052
- %System%\PING.EXE ping 127.0.0.1 -n 2 -w 500
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
Autostart Technique
This Potentially Unwanted Application adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
setsearch_delete_self = "{malware path and file name}.doc.doc.doc --selfdelete"
Other System Modifications
This Potentially Unwanted Application deletes the following files:
- {malware file path and name}
It adds the following registry keys:
HKEY_CURRENT_USER\Software\setsearch
It adds the following registry entries:
HKEY_CURRENT_USER\Software\setsearch
GoSearch_setsearchpid = "3052"
HKEY_CURRENT_USER\Software\setsearch
GoSearch_setsearchstarttime = "\x9a\xa6\xda\xcaQ\xd5\x01"
It deletes the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce\
setsearch_delete_self
HKEY_CURRENT_USER\Software\setsearch\
GoSearch_setsearchpid
HKEY_CURRENT_USER\Software\setsearch\
GoSearch_setsearchstarttime
Dropping Routine
This Potentially Unwanted Application drops the following files:
- %AppDataLocal%Low\Microsoft\Internet Explorer\Services\search_{A06ED961-D98F-4CF9-A89B-80AB11DB149C}.ico
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Other Details
This Potentially Unwanted Application connects to the following possibly malicious URL:
- http://g.{BLOCKED}ho.ru
This report is generated via an automated analysis system.
SOLUTION
9.850
Step 1
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Identify and terminate files detected as PUA_RUKOMETA.SMALY
- 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 4
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
- setsearch
Step 5
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\RunOnce
- setsearch_delete_self = "{malware path and file name}.doc.doc.doc --selfdelete"
- In HKEY_CURRENT_USER\Software\setsearch
- GoSearch_setsearchpid = "3052"
- In HKEY_CURRENT_USER\Software\setsearch
- GoSearch_setsearchstarttime = "\x9a\xa6\xda\xcaQ\xd5\x01"
Step 6
Search and delete this file
- %AppDataLocal%Low\Microsoft\Internet Explorer\Services\search_{A06ED961-D98F-4CF9-A89B-80AB11DB149C}.ico
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as PUA_RUKOMETA.SMALY. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- {malware file path and name}
Step 9
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- setsearch_delete_self
- In HKEY_CURRENT_USER\Software\setsearch
- GoSearch_setsearchpid
- In HKEY_CURRENT_USER\Software\setsearch
- GoSearch_setsearchstarttime
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