➔
search
✕

BKDR_HUPIGON.SPZG

June 06, 2015
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size:

737,280 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Jun 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.

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
bootStart = "%System%\lib32waun.exe"

Other System Modifications

This backdoor deletes the following files:

  • %System Root%\Tcpz-x86.sys

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
Service1

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\WaunSvc
FailureActions = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
Service1
EventMessageFile = "%Windows%\Microsoft.NET\Framework\v4.0.30319\EventLogMessages.dll"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ASP.NET_4.0.30319\Names
{random string} = "6d8"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application
Sources = "{random characters}"

(Note: The default value data of the said registry entry is {random values}.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}4.240.133
  • {BLOCKED}.127.134
  • {BLOCKED}.43.150
  • {BLOCKED}.244.21
  • {BLOCKED}.251.33
  • {BLOCKED}5.194.43
  • {BLOCKED}.197.214
  • {BLOCKED}.197.200
  • {BLOCKED}.241.116
  • {BLOCKED}5.194.20
  • {BLOCKED}.66.146
  • {BLOCKED}.165.86
  • {BLOCKED}.84.197
  • {BLOCKED}5.177.213
  • {BLOCKED}3.14.125
  • {BLOCKED}5.155.5
  • {BLOCKED}5.151.29
  • {BLOCKED}.235.28
  • {BLOCKED}176.83
  • {BLOCKED}.235.17
  • {BLOCKED}.211.205
  • {BLOCKED}.224.172
  • {BLOCKED}.20.18
  • {BLOCKED}.177.248
  • {BLOCKED}.250.75
  • {BLOCKED}5.103.168
  • {BLOCKED}5.110.21
  • {BLOCKED}8.15.50
  • {BLOCKED}.185.162
  • {BLOCKED}.179.106
  • {BLOCKED}.116.159
  • {BLOCKED}5.2
  • {BLOCKED}112.84
  • {BLOCKED}5.3
  • {BLOCKED}176.100
  • {BLOCKED}5.4
  • {BLOCKED}5.5
  • {BLOCKED}5.110.39
  • {BLOCKED}5.6
  • {BLOCKED}5.110.26
  • {BLOCKED}5.7
  • {BLOCKED}.170.77
  • {BLOCKED}5.8
  • {BLOCKED}5.9
  • {BLOCKED}5.12
  • {BLOCKED}5.13
  • {BLOCKED}5.14
  • {BLOCKED}5.16
  • {BLOCKED}5.18
  • {BLOCKED}5.20
  • {BLOCKED}5.21
  • {BLOCKED}5.22
  • {BLOCKED}5.23
  • {BLOCKED}5.24
  • {BLOCKED}5.25
  • {BLOCKED}5.26
  • {BLOCKED}5.27
  • {BLOCKED}5.28
  • {BLOCKED}5.29
  • {BLOCKED}5.30
  • {BLOCKED}5.31
  • {BLOCKED}5.32
  • {BLOCKED}5.33
  • {BLOCKED}5.34
  • {BLOCKED}5.35
  • {BLOCKED}5.36
  • {BLOCKED}5.37
  • {BLOCKED}5.38
  • {BLOCKED}5.39
  • {BLOCKED}49.164
  • {BLOCKED}.196.149
  • {BLOCKED}5.40
  • {BLOCKED}5.41
  • {BLOCKED}5.42
  • {BLOCKED}5.43
  • {BLOCKED}5.44
  • {BLOCKED}5.45
  • {BLOCKED}5.46
  • {BLOCKED}5.47
  • {BLOCKED}5.48
  • {BLOCKED}5.49
  • {BLOCKED}5.50
  • {BLOCKED}5.51
  • {BLOCKED}5.52
  • {BLOCKED}5.53
  • {BLOCKED}5.54
  • {BLOCKED}5.55
  • {BLOCKED}5.56

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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\ControlSet001\Services\Eventlog\Application
    • Service1

Step 4

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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • bootStart = "%System%\lib32waun.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\WaunSvc
    • FailureActions = "{random values}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\Service1
    • EventMessageFile = "%Windows%\Microsoft.NET\Framework\v4.0.30319\EventLogMessages.dll"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ASP.NET_4.0.30319\Names
    • {random string} = "6d8"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application
    • From: Sources = "{random characters}"
      To: Sources = ""{random values}""

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_HUPIGON.SPZG. 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 7

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.

  • %System Root%\Tcpz-x86.sys


Did this description help? Tell us how we did.