TROJ_UPATRE.YYSKG

June 06, 2015

Analysis by: RonJay Kristoffer Caragay

ALIASES:

TrojanDownloader:Win32/Upatre.BK (Microsoft); Troj/Dyreza-FF (Sophos); Trojan horse Crypt_s.IMJ (AVG); W32/Upatre.AA.gen!Eldorado (generic, not disinfectable) (F-Prot)

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

INFORMATION EXPOSURE:

Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes

OVERVIEW

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.

It deletes itself after execution.

TECHNICAL DETAILS

File Size:

30,720 bytes

File Type:

EXE

Memory Resident:

Initial Samples Received Date:

25 May 2015

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 copies of itself into the affected system:

%User Temp%\seventime.exe

(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.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\PublicProfile
EnableFirewall = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\PublicProfile
DoNotAllowExceptions = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\PublicProfile
DisableNotifications = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
EnableFirewall = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DoNotAllowExceptions = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DisableNotifications = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\Services\SharedAccess
Start = "4"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallOverride = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = "1"

Dropping Routine

This Trojan drops the following files:

%User Temp%\~RF18B35.tmp
%User Temp%\{random filename}.exe

Other Details

This Trojan connects to the following possibly malicious URL:

https://{BLOCKED}.{BLOCKED}.204.31/fike22.png
https://{BLOCKED}.{BLOCKED}.13.2/fike22.png
https://{BLOCKED}.{BLOCKED}.204.16/fike22.png
https://{BLOCKED}.{BLOCKED}.30.156/fike22.png
https://{BLOCKED}.{BLOCKED}.195.68/fike22.png
https://{BLOCKED}.{BLOCKED}.217.139/fike22.png
https://{BLOCKED}.{BLOCKED}.41.38/fike22.png
https://{BLOCKED}.{BLOCKED}.141.50/fike22.png
https://{BLOCKED}.{BLOCKED}.131.73/fike22.png
https://{BLOCKED}.{BLOCKED}.132.118/fike22.png
https://{BLOCKED}.{BLOCKED}.203.19/fike22.png
https://{BLOCKED}.{BLOCKED}.149.40/fike22.png
https://{BLOCKED}.{BLOCKED}.104.170/fike22.png
https://{BLOCKED}.{BLOCKED}.129.182/fike22.png
https://{BLOCKED}.{BLOCKED}.142.189/fike22.png
http://{BLOCKED}.{BLOCKED}.4.90:{port}/FIK22/{Host Name}

It deletes itself after execution.

SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN DATE:

19 May 2015

VSAPI OPR PATTERN Date:

20 May 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

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

Delete this registry value

[ Learn More ]

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\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall = "0"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "0"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\PublicProfile
- EnableFirewall = "0"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\PublicProfile
- DoNotAllowExceptions = "0"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\PublicProfile
- DisableNotifications = "1"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- EnableFirewall = "0"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DoNotAllowExceptions = "0"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DisableNotifications = "1"
In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Services\SharedAccess
- Start = "4"
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "1"
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusOverride = "1"
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = "1"
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallOverride = "1"
In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UpdatesDisableNotify = "1"

To delete the registry value this malware created:

Open Registry Editor. To do this:
» For Windows 2000, Windows XP, and Windows Server 2003 users, click Start>Run, type regedit in the text box provided, and then press Enter.
» For Windows Vista, Windows 7, and Windows Server 2008 users, click the Start button, type regedit in the Search input field then press Enter.
» For Windows 8, Windows 8.1, and Windows Server 2012 users, right-click on the lower left corner of the screen, click Run, type regedit in the text box provided, and then press Enter.
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>SharedAccess>Parameters>FirewallPolicy>StandardProfile
In the right panel, locate and delete the entry:
EnableFirewall = "0"
Again In the right panel, locate and delete the entry:
DoNotAllowExceptions = "0"
Again In the right panel, locate and delete the entry:
DisableNotifications = "1"
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>SharedAccess>Parameters>FirewallPolicy>PublicProfile
In the right panel, locate and delete the entry:
EnableFirewall = "0"
Again In the right panel, locate and delete the entry:
DoNotAllowExceptions = "0"
Again In the right panel, locate and delete the entry:
DisableNotifications = "1"
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>SharedAccess>Parameters>FirewallPolicy>DomainProfile
In the right panel, locate and delete the entry:
EnableFirewall = "0"
Again In the right panel, locate and delete the entry:
DoNotAllowExceptions = "0"
Again In the right panel, locate and delete the entry:
DisableNotifications = "1"
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>CurrentControlSet>services>Services>SharedAccess
In the right panel, locate and delete the entry:
Start = "4"
In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Security Center
In the right panel, locate and delete the entry:
AntiVirusDisableNotify = "1"
Again In the right panel, locate and delete the entry:
AntiVirusOverride = "1"
Again In the right panel, locate and delete the entry:
FirewallDisableNotify = "1"
Again In the right panel, locate and delete the entry:
FirewallOverride = "1"
Again In the right panel, locate and delete the entry:
UpdatesDisableNotify = "1"
Close Registry Editor.

Step 4

Search and delete these files

[ Learn More ]

There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%User Temp%\~RF18B35.tmp
%User Temp%\{random filename}.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_UPATRE.YYSKG. 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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TROJ_UPATRE.YYSKG

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