Analysis by: Pearl Charlaine Espejo
ALIASES:

Trojan-Proxy.Win32.Glupteba.nlp (Kaspersky); TR/Glupteba.71189 (Avira); W32.FamVT.GluptebaBTTc.Worm (Bkav); Win32/Glupteba.M (ESET-NOD32); W32/Glupteba.NLQ!tr (Fortinet)

 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.

  TECHNICAL DETAILS

File Size: 71,189 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 30 Jul 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 files:

  • %User Temp%\ns{random characters}.tmp
  • %User Temp%\ns{random characters}.tmp\System.dll
  • %AppDataLocal%\NVIDIA Corporation\Updates\NvdUpd.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.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
NvUpdSrv = %AppDataLocal%\NVIDIA Corporation\Updates\NvdUpd.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\NVIDIA Corporation

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global\nvUpdSrv

It adds the following registry entries:

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global\nvUpdSrv
value = "{installed version of malware}"

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global\nvUpdSrv
GUID = "{GUID}"

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global\nvUpdSrv
svalue = "{random characters}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.38.62:17326
  • {BLOCKED}.{BLOCKED}.20.226:54127
  • {BLOCKED}.{BLOCKED}.110.162:37174
  • {BLOCKED}.{BLOCKED}.220.87:54091
  • {BLOCKED}.{BLOCKED}.59.99:30577
  • {BLOCKED}.{BLOCKED}.36.128:15206
  • {BLOCKED}.{BLOCKED}.188.2:48105
  • {BLOCKED}.{BLOCKED}.87.184:49205
  • {BLOCKED}.{BLOCKED}.163.194:60098
  • {BLOCKED}.{BLOCKED}.201.53:20075
  • {BLOCKED}.{BLOCKED}.89.138:31174
  • {BLOCKED}.{BLOCKED}.40.162:36846
  • {BLOCKED}.{BLOCKED}.224.22:39976
  • {BLOCKED}.{BLOCKED}.62.122:32406
  • {BLOCKED}.{BLOCKED}.22.66:22740
  • {BLOCKED}.{BLOCKED}.208.91:14229
  • {BLOCKED}.{BLOCKED}.45.29:22237
  • {BLOCKED}.{BLOCKED}.248:48439
  • {BLOCKED}.{BLOCKED}.183.6:10049
  • {BLOCKED}.{BLOCKED}.167.242:15745
  • {BLOCKED}.{BLOCKED}.56.90:10703
  • {BLOCKED}.{BLOCKED}.183.94:49721
  • {BLOCKED}.{BLOCKED}.59.146:45297
  • {BLOCKED}.{BLOCKED}.35.140:28103
  • {BLOCKED}.{BLOCKED}.55.90:45297
  • {BLOCKED}.{BLOCKED}.20.202:36102
  • {BLOCKED}.{BLOCKED}.189.121:26195
  • {BLOCKED}.{BLOCKED}.228.137:35521
  • {BLOCKED}.{BLOCKED}.241.7:37399
  • {BLOCKED}.{BLOCKED}.103.43:58207
  • {BLOCKED}.{BLOCKED}.147.29:33376
  • {BLOCKED}.{BLOCKED}.251.29:16493
  • {BLOCKED}.{BLOCKED}.246.47:51117
  • {BLOCKED}.{BLOCKED}.227.210:45297
  • {BLOCKED}.{BLOCKED}.229.240:43992
  • {BLOCKED}.{BLOCKED}.141.2:40443
  • {BLOCKED}.{BLOCKED}.78.145:39632
  • {BLOCKED}.{BLOCKED}.240.170:25338
  • {BLOCKED}.{BLOCKED}.252.192:51964
  • {BLOCKED}.{BLOCKED}.175.170:49996
  • {BLOCKED}.{BLOCKED}.243.115:25603
  • {BLOCKED}.{BLOCKED}.125.65:18703
  • {BLOCKED}.{BLOCKED}.171.78:59899
  • {BLOCKED}.{BLOCKED}.70.56:38271
  • {BLOCKED}.{BLOCKED}.77.28:27190
  • {BLOCKED}.{BLOCKED}.53.165:34549
  • {BLOCKED}.{BLOCKED}.11.117:20357
  • {BLOCKED}.{BLOCKED}.119.1:35535
  • {BLOCKED}.{BLOCKED}.85.118:49126
  • {BLOCKED}.{BLOCKED}.25.8:40406
  • {BLOCKED}.{BLOCKED}.196.144:20480
  • {BLOCKED}.{BLOCKED}.176.249:52112
  • {BLOCKED}.{BLOCKED}.246.180:50007
  • {BLOCKED}.{BLOCKED}.88.151:24423
  • {BLOCKED}.{BLOCKED}.138.200:18150
  • {BLOCKED}.{BLOCKED}.57.216:39106
  • {BLOCKED}.{BLOCKED}.130.17:11263
  • {BLOCKED}.{BLOCKED}.37.210:49994
  • {BLOCKED}.{BLOCKED}.203.86:11908
  • {BLOCKED}.{BLOCKED}.66.242:27042
  • {BLOCKED}.{BLOCKED}.73.240:27936
  • {BLOCKED}.{BLOCKED}.130.99:17325
  • {BLOCKED}.{BLOCKED}.133.248:46856
  • {BLOCKED}.{BLOCKED}.208.11:32965
  • {BLOCKED}.{BLOCKED}.36.253:51376
  • {BLOCKED}.{BLOCKED}.113.81:10934
  • {BLOCKED}.{BLOCKED}.160.173:12131
  • {BLOCKED}.{BLOCKED}.119.203:34373
  • {BLOCKED}.{BLOCKED}.27.43:28731
  • {BLOCKED}.{BLOCKED}.74.150:31973
  • {BLOCKED}.{BLOCKED}.119.218:37127
  • {BLOCKED}.{BLOCKED}.90.15:45297
  • {BLOCKED}.{BLOCKED}.211.223:59138
  • {BLOCKED}.{BLOCKED}.58.68:23480
  • {BLOCKED}.{BLOCKED}.62.4:16660
  • {BLOCKED}.{BLOCKED}.39.114:19650
  • {BLOCKED}.{BLOCKED}.253.1:22357
  • {BLOCKED}.{BLOCKED}.233.149:35173
  • {BLOCKED}.{BLOCKED}.242.114:29342
  • {BLOCKED}.{BLOCKED}.222.1:33879
  • {BLOCKED}.{BLOCKED}.49.22:12410
  • {BLOCKED}.{BLOCKED}.154.220:53818
  • {BLOCKED}.{BLOCKED}.175.34:35638
  • {BLOCKED}.{BLOCKED}.119.178:19069
  • {BLOCKED}.{BLOCKED}.138.38:51376
  • {BLOCKED}.{BLOCKED}.21.1:33679
  • {BLOCKED}.{BLOCKED}.172.134:36822
  • {BLOCKED}.{BLOCKED}.80.46:25127
  • {BLOCKED}.{BLOCKED}.216.108:51376
  • {BLOCKED}.{BLOCKED}.97.157:58186
  • {BLOCKED}.{BLOCKED}.210.72:35607
  • {BLOCKED}.{BLOCKED}.33.126:42386
  • {BLOCKED}.{BLOCKED}.69.212:53129
  • {BLOCKED}.{BLOCKED}.204.220:53986
  • {BLOCKED}.{BLOCKED}.188.228:30708
  • {BLOCKED}.{BLOCKED}.40.93:29037
  • {BLOCKED}.{BLOCKED}.216.19:44573
  • {BLOCKED}.{BLOCKED}.77.246:51841
  • {BLOCKED}.{BLOCKED}.2.130:10557
  • {BLOCKED}.{BLOCKED}.200.153:17513
  • {BLOCKED}.{BLOCKED}.48.8:37007
  • {BLOCKED}.{BLOCKED}.66.66:45297

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.822.03
FIRST VSAPI PATTERN DATE: 30 Jul 2015
VSAPI OPR PATTERN File: 11.823.00
VSAPI OPR PATTERN Date: 31 Jul 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

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • NvUpdSrv = "%AppDataLocal%\NVIDIA Corporation\Updates\NvdUpd.exe"

Step 5

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_CURRENT_USER\Software\NVIDIA Corporation\Global
    • nvUpdSrv

Step 6

Search and delete this file

[ 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%\ns{random characters}.tmp
  • %User Temp%\ns{random characters}.tmp\System.dll
  • %AppDataLocal%\NVIDIA Corporation\Updates\NvdUpd.exe

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_GLUPTEBA.KB. 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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