BKDR_SANDBOX.A


 ALIASES:

TrojanDownloader:Win32/VB.EM (Microsoft); Adware-MemWatcher. (McAfee); Adware.Quadro (Symantec); Trojan-Downloader.Win32.VB.em, Trojan-Downloader.Win32.VB.em (Kaspersky); Backdoor.Win32.VB.PEK!cobra (v) (Sunbelt); Trojan.Downloader.VB.EM (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

  TECHNICAL DETAILS

File Size:

499,762 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

25 Jan 2012

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
5AMS6YT4#WA8FL = "%System Root%\{malware file name}.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\2QWJ5KH52G5TJR

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\2QWJ5KH52G5TJR
5F#5CH32H@E45@ = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5Q8X34Y5QKY2J5 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5KHE9@34LSC6@J = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
3TLP@F757ZJR4S = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
4GMLD5G37SK48R = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2Q8SBLB2PMAK8B = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2XWNBFH4TZRRNM = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
22#34465#G7WYJ = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
4EDH@P@2GG89#G = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5452WQK46A2KY# = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2XWKH3A29L4KHE = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
39TTYF22BN#GS3 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
469N##X4DL#7AE = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
48PWC4F5XC3WZ6 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
4Z3@6L92BRSZCB = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2PN#HFF2W5RK7N = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
3HQJTJN2QFJSP2 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
3E5CF@K5SES#XC = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2CN33793XG8QA2 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5L7TABL5HPTGSS = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5Q9R#NW26656PP = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
289WRZT2@59JTP = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5G#QE@S3JJ47A3 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
33K465A3EJLCM4 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2ACT37N5R#6SXZ = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
55@PQJD2QH7JJN = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
4KKBXYK5NQQ7WH = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2FGKMHZ25WB5C5 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
4JG35L24X9Z#97 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
4SQQ49G5XWCEBK = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2SWCFM64X9#GG5 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5SLXLTZ4FPZKEA = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
2B8J4SG3Z3#9Z6 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
534H3P638JT3SL = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
52GB9CS2CSP@P6 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
3@ZK79K32HQZQ4 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
3E5SQPW2PTCA42 = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
36FX2EX4C8YC8P = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
5HJTR5K5RRTRRK = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Enable Browser Extensions = "yes"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://rads01.{BLOCKED}gram.com/RADS3/settings/?{random characters}
  • http://rads01.{BLOCKED}gram.com/RADS3/binaries/lu.bin?{random characters}

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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\SOFTWARE
    • 2QWJ5KH52G5TJR
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • 37375#Q2TNJSN8

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
    • 5AMS6YT4#WA8FL="%System Root%\{malware file name}.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\2QWJ5KH52G5TJR
    • 5F#5CH32H@E45@="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5Q8X34Y5QKY2J5="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5KHE9@34LSC6@J="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 3TLP@F757ZJR4S="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 4GMLD5G37SK48R="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2Q8SBLB2PMAK8B="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2XWNBFH4TZRRNM="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 22#34465#G7WYJ="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 4EDH@P@2GG89#G="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5452WQK46A2KY#="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2XWKH3A29L4KHE="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 39TTYF22BN#GS3="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 469N##X4DL#7AE="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 48PWC4F5XC3WZ6="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 4Z3@6L92BRSZCB="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2PN#HFF2W5RK7N="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 3HQJTJN2QFJSP2="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 3E5CF@K5SES#XC="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2CN33793XG8QA2="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5L7TABL5HPTGSS="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5Q9R#NW26656PP="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 289WRZT2@59JTP="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5G#QE@S3JJ47A3="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 33K465A3EJLCM4="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2ACT37N5R#6SXZ="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 55@PQJD2QH7JJN="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 4KKBXYK5NQQ7WH="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2FGKMHZ25WB5C5="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 4JG35L24X9Z#97="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 4SQQ49G5XWCEBK="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2SWCFM64X9#GG5="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5SLXLTZ4FPZKEA="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 2B8J4SG3Z3#9Z6="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 534H3P638JT3SL="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 52GB9CS2CSP@P6="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 3@ZK79K32HQZQ4="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 3E5SQPW2PTCA42="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 36FX2EX4C8YC8P="{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\37375#Q2TNJSN8
    • 5HJTR5K5RRTRRK="{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Enable Browser Extensions="yes"

Step 5

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