TROJ_DLOADR.AUSUMA
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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
6,232,185 bytes
EXE
15 Jun 2018
Connects to URLs/IPs, Downloads files
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 drops the following files:
- %System Root%\$Recycle.Bin\S-1-3
- %System Root%\Users\Public\Documents\{GUID}
- %Temp%\{GUID}
- %User Temp%\{GUID}
- {malware path}\config.ini - configuration file
- {malware path}\svc_client.exe.old.bak- - renamed copy of itself
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.. %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 System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Interval = {date}
HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Oem = unknown
HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Tm = {number}
HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Uid = {hex string}
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- http://admin.{BLOCKED}onweb.com/product_file/cpuz_go2008.exe
It saves the files it downloads using the following names:
- {malware path}\cpuz_go2008.exe (renamed to {malware filename}.exe afterwards)
NOTES:
It connects to the following website to send and receive information:
- hxxp://{BLOCKED}e.{BLOCKED}onweb[.]com/proton/Log/logStart_cpuz.php
- hxxp://{BLOCKED}e.{BLOCKED}onweb[.]com/proton/Log/logUpdate_cpuz.php
SOLUTION
9.850
14.348.04
29 Jun 2018
14.349.00
30 Jun 2018
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Identify and terminate files detected as TROJ_DLOADR.AUSUMA
- 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 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_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
- Interval = {date}
- Interval = {date}
- In HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
- Oem = unknown
- Oem = unknown
- In HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
- Tm = {number}
- Tm = {number}
- In HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
- Uid = {hex string}
- Uid = {hex string}
Step 5
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\SOFTWARE
- NetworkMgmt
- NetworkMgmt
Step 6
Search and delete these files
- {malware path}\cpuz_go2008.exe
- {malware filename}.exe
- %System Root%\$Recycle.Bin\S-1-3
- %System Root%\Users\Public\Documents\{GUID}
- %Temp%\{GUID}
- %User Temp%\{GUID}
- {malware path}\config.ini
- {malware path}\svc_client.exe.old.bak-
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.AUSUMA. 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 the following Trend Micro Support pages for more information:
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