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TROJ_CARBERP.YVC

June 16, 2015
 Analysis by: David John Agni
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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 does not have any propagation routine.

It does not have any backdoor routine.

  TECHNICAL DETAILS

File Size:

129,210 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Jun 2015

Payload:

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 adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\MD7H82HHF7EH2D73

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\NVIDIA Corporation\
Global\nvUpdSrv

It adds the following registry entries:

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global\nvUpdSrv
value = {ininitally the installed version of malware which is "21150524"}

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

HKEY_CURRENT_USER\Software\NVIDIA Corporation\
Global\nvUpdSrv
svalue = "{encrypted IP Addresses}"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • {BLOCKED}.224.177.4:18532
  • {BLOCKED}.28.67.170:53872
  • {BLOCKED}.194.70.56:38271
  • {BLOCKED}.116.37.210:49994
  • {BLOCKED}.137.209.137:37127
  • {BLOCKED}.187.64.85:19753
  • {BLOCKED}.207.188.250:48439
  • {BLOCKED}.143.138.226:31973
  • {BLOCKED}.14.96.120:31885
  • {BLOCKED}.78.104.139:18532
  • {BLOCKED}.236.140.15:16577
  • {BLOCKED}.252.188.228:30708
  • {BLOCKED}.79.80.162:14066
  • {BLOCKED}.193.169.249:33376
  • {BLOCKED}.254.56.90:10703
  • {BLOCKED}.133.180.243:33879
  • {BLOCKED}.135.181.123:27571
  • {BLOCKED}.74.99.100:30124
  • {BLOCKED}.154.124.202:38109
  • {BLOCKED}.113.233.83:29283
  • {BLOCKED}.164.223.222:43118
  • {BLOCKED}.80.56.11:19141
  • {BLOCKED}.20.130.99:17325
  • {BLOCKED}.27.85.118:49126
  • {BLOCKED}.253.36.128:15206
  • {BLOCKED}.13.218.26:22237
  • {BLOCKED}.83.253.1:22357
  • {BLOCKED}.17.98.62:53127
  • {BLOCKED}.154.84.82:35971
  • {BLOCKED}.236.22.66:22740
  • {BLOCKED}.75.163.194:60098
  • {BLOCKED}.60.205.155:22887
  • {BLOCKED}.154.146.98:25127
  • {BLOCKED}.146.118.90:35535
  • {BLOCKED}.154.91.162:49891
  • {BLOCKED}.133.180.232:53872
  • {BLOCKED}.18.148.43:49126
  • {BLOCKED}.175.48.2:52112
  • {BLOCKED}.106.77.246:51841
  • {BLOCKED}.204.119.1:35535
  • {BLOCKED}.22.110.162:37174
  • {BLOCKED}.168.30.246:23962
  • {BLOCKED}.212.154.220:53818
  • {BLOCKED}.238.54.133:31189
  • {BLOCKED}.106.237.81:19413
  • {BLOCKED}.60.1.90:11982
  • {BLOCKED}.92.138.200:18150
  • {BLOCKED}.236.59.146:45297
  • {BLOCKED}.189.192.11:34907
  • {BLOCKED}.206.0.216:37288
  • {BLOCKED}.169.231.223:43992
  • {BLOCKED}.14.96.102:37174
  • {BLOCKED}.95.80.46:25127
  • {BLOCKED}.236.42.98:27042
  • {BLOCKED}.13.227.13:33879
  • {BLOCKED}.175.87.184:49205
  • {BLOCKED}.169.189.121:26195
  • {BLOCKED}.20.78.26:52112
  • {BLOCKED}.38.101.66:11410
  • {BLOCKED}.30.174.195:18387
  • {BLOCKED}.178.52.26:23097
  • {BLOCKED}.33.248.60:46612
  • {BLOCKED}.126.219.150:14950
  • {BLOCKED}.75.49.140:23516
  • {BLOCKED}.75.188.2:48105
  • {BLOCKED}.236.55.90:45297
  • {BLOCKED}.211.37.172:54091
  • {BLOCKED}.203.196.144:20480
  • {BLOCKED}.194.12.149:57136
  • {BLOCKED}.223.62.4:16660
  • {BLOCKED}.114.41.63:49996
  • {BLOCKED}.135.144.91:36139
  • {BLOCKED}.165.40.162:36846
  • {BLOCKED}.19.20.202:36102
  • {BLOCKED}.95.81.228:22516
  • {BLOCKED}.221.59.2:26195
  • {BLOCKED}.230.195.47:59899
  • {BLOCKED}.31.79.158:58186
  • {BLOCKED}.103.59.99:30577
  • {BLOCKED}.77.113.81:10934
  • {BLOCKED}.30.61.112:44032
  • {BLOCKED}.254.45.29:22237
  • {BLOCKED}.236.31.250:38102
  • {BLOCKED}.232.57.16:12320
  • {BLOCKED}.211.20.226:54127
  • {BLOCKED}.22.103.43:58207
  • {BLOCKED}.60.205.163:25549
  • {BLOCKED}.236.56.202:45297
  • {BLOCKED}.193.175.117:51447
  • {BLOCKED}.157.74.66:30478
  • {BLOCKED}.163.224.26:32136
  • {BLOCKED}.71.8.132:44052
  • {BLOCKED}.116.54.156:46956
  • {BLOCKED}.157.209.207:53127
  • {BLOCKED}.193.175.120:11754
  • {BLOCKED}.35.160.138:43782
  • {BLOCKED}.154.106.186:45297
  • {BLOCKED}.7.58.68:23480
  • {BLOCKED}.131.139.225:26545
  • {BLOCKED}.154.167.242:15745
  • {BLOCKED}.14.97.157:58186

It saves the files it downloads using the following names:

  • %User Temp%\nvu{random}.tmp.exe - it executes this file

(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.)

NOTES:

It notifies the IP addresses mentioned above and then waits for further acknowledgement before downloading.

As of this writing, the C&C servers are unresponsive.

It can also receive information on the connection and can update the value on the following registry:

HKEY_CURRENT_USER\Software\NVIDIA Corporation\Global\nvUpdSr
value = {value}

It can also receive information where it can also connect to other IP addresses. It may also download from these new connections.

The following are the new IP addresses:

  • {BLOCKED}.{BLOCKED}.25.26:13208
  • {BLOCKED}.{BLOCKED}.159.146:13208
  • {BLOCKED}.{BLOCKED}.74.175:49721

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.720.04

FIRST VSAPI PATTERN DATE:

09 Jun 2015

VSAPI OPR PATTERN File:

11.721.00

VSAPI OPR PATTERN Date:

10 Jun 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 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 5

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%\nvu{random}.tmp.exe

Step 6

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

Scan your computer with your Trend Micro product to delete files detected as TROJ_CARBERP.YVC. 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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