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TROJ_INJECT.XXTYN

July 12, 2015
 ALIASES:

Trojan horse Atros.BNCM (AVG)

 PLATFORM:

Windows

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

  • 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:

139,216 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

09 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 creates the following folders:

  • %User Profile%\CryptnetUrlCache\MetaData
  • %User Profile%\Microsoft\CryptnetUrlCache
  • %User Profile%\CryptnetUrlCache\Content
  • %User Profile%\Application Data\rXLpRyuil
  • %User Profile%\Application Data\LyVyMrjTX

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other System Modifications

This Trojan modifies the following file(s):

  • %Application Data%\GDIPFONTCACHEV1.DAT

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
2F173F7DE99667AFA57AF80AA2D1B12FAC830338
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4EFCED9C6BDD0C985CA3C7D253063C5BE6FC620C
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4EF2E6670AC9B5091FE06BE0E5483EAAD6BA32D9
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4C95A9902ABE0777CED18D6ACCC3372D2748381E
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4BA7B9DDD68788E12FF852E1A024204BF286A8F6
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4B421F7515F6AE8A6ECEF97F6982A400A4D9224E
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
47AFB915CDA26D82467B97FA42914468726138DD
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4463C531D7CCC1006794612BB656D3BF8257846F
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
43F9B110D5BAFD48225231B0D0082B372FEF9A54
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
43DDB1FFF3B49B73831407F6BC8B975023D07C50
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
40E78C1D523D1CD9954FAC1A1AB3BD3CBAA15BFC
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
4072BA31FEC351438480F62E6CB95508461EAB2F
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
3F85F2BB4A62B0B58BE1614ABB0D4631B4BEF8BA
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
394FF6850B06BE52E51856CC10E180E882B385CC
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
36863563FD5128C7BEA6F005CFE9B43668086CCE
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\AuthRoot\Certificates\
317A2AD07F2B335EF5A1C34E4B57E8B7D8F1FCA6
Blob = "{random values}"

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
SystemCertificates\CA\Certificates\
E5215D3460C2C20BBE2D9FE5FB665DAA2C0E225C
Blob = "{random values}"

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

HKEY_CURRENT_USER\Software\Microsoft\
GDIPlus
FontCachePath = "%Application Data%"

(Note: The default value data of the said registry entry is %User Profile%\Local Settings\Application Data.)

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\MetaData\2BF68F4714092295550497DD56F57004
  • %User Profile%\Content\2BF68F4714092295550497DD56F57004
  • %User Profile%\MetaData\94308059B57B3142E455B38A6EB92015
  • %User Profile%\Content\94308059B57B3142E455B38A6EB92015
  • %User Temp%\Cab8.tmp
  • %User Temp%\TarA.tmp
  • %User Profile%\MetaData\DC2135CED98D8A4D7C0CEE202BB0B810
  • %User Profile%\Content\DC2135CED98D8A4D7C0CEE202BB0B810
  • %User Profile%\MetaData\F5A17C00E427F919C4A49EEF5AD0EE53
  • %User Profile%\Content\F5A17C00E427F919C4A49EEF5AD0EE53
  • %User Profile%\MetaData\5C8DDA36D60247082B142836039F4636
  • %User Profile%\Content\5C8DDA36D60247082B142836039F4636
  • %User Profile%\rXLpRyuil\bb33286cb6034e2a93a8ccdafabde52c
  • %User Profile%\rXLpRyuil\0ac94d99fd6c47b98c0cbf6b80bb989b
  • %User Profile%\rXLpRyuil\bf7a13ceb151457d95357fb969d2325f
  • %User Profile%\LyVyMrjTX\yfNAj.exe
  • %User Temp%\Cab1B.tmp
  • %User Temp%\Tar1D.tmp
  • %User Startup%\LyVyMrjTX.url
  • %User Profile%\rXLpRyuil\45c4fdf4a47b43d28e1389834d79a873
  • %User Profile%\rXLpRyuil\6e0f136959bd4a93a45021280d1f556d
  • %User Profile%\rXLpRyuil\0120d2af04864231800bc6797dec6293
  • %User Profile%\rXLpRyuil\0206b983678548dcbc8565d263f78ada
  • %User Temp%\tmp27.tmp
  • %User Temp%\tmp2B.tmp
  • %User Temp%\tmp2F.tmp

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}29.197
  • {BLOCKED}2.232.207
  • {BLOCKED}.76.193
  • {BLOCKED}8.141.75
  • {BLOCKED}.191.150
  • {BLOCKED}6.112.172
  • {BLOCKED}.248.178
  • {BLOCKED}5.144.168

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

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\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\2F173F7DE99667AFA57AF80AA2D1B12FAC830338
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4EFCED9C6BDD0C985CA3C7D253063C5BE6FC620C
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4EF2E6670AC9B5091FE06BE0E5483EAAD6BA32D9
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4C95A9902ABE0777CED18D6ACCC3372D2748381E
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4BA7B9DDD68788E12FF852E1A024204BF286A8F6
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4B421F7515F6AE8A6ECEF97F6982A400A4D9224E
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\47AFB915CDA26D82467B97FA42914468726138DD
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4463C531D7CCC1006794612BB656D3BF8257846F
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\43F9B110D5BAFD48225231B0D0082B372FEF9A54
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\43DDB1FFF3B49B73831407F6BC8B975023D07C50
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\40E78C1D523D1CD9954FAC1A1AB3BD3CBAA15BFC
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\4072BA31FEC351438480F62E6CB95508461EAB2F
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\3F85F2BB4A62B0B58BE1614ABB0D4631B4BEF8BA
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\394FF6850B06BE52E51856CC10E180E882B385CC
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\36863563FD5128C7BEA6F005CFE9B43668086CCE
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\317A2AD07F2B335EF5A1C34E4B57E8B7D8F1FCA6
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\CA\Certificates\E5215D3460C2C20BBE2D9FE5FB665DAA2C0E225C
    • From: Blob = "{random values}"
      To: Blob = ""{random values}""
  • In HKEY_CURRENT_USER\Software\Microsoft\GDIPlus
    • From: FontCachePath = "%Application Data%"
      To: FontCachePath = ""%User Profile%\Local Settings\Application Data""

Step 3

Search and delete these components

[ Learn More ]
There may be some components 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 Profile%\MetaData\2BF68F4714092295550497DD56F57004
  • %User Profile%\Content\2BF68F4714092295550497DD56F57004
  • %User Profile%\MetaData\94308059B57B3142E455B38A6EB92015
  • %User Profile%\Content\94308059B57B3142E455B38A6EB92015
  • %User Temp%\Cab8.tmp
  • %User Temp%\TarA.tmp
  • %User Profile%\MetaData\DC2135CED98D8A4D7C0CEE202BB0B810
  • %User Profile%\Content\DC2135CED98D8A4D7C0CEE202BB0B810
  • %User Profile%\MetaData\F5A17C00E427F919C4A49EEF5AD0EE53
  • %User Profile%\Content\F5A17C00E427F919C4A49EEF5AD0EE53
  • %User Profile%\MetaData\5C8DDA36D60247082B142836039F4636
  • %User Profile%\Content\5C8DDA36D60247082B142836039F4636
  • %User Profile%\rXLpRyuil\bb33286cb6034e2a93a8ccdafabde52c
  • %User Profile%\rXLpRyuil\0ac94d99fd6c47b98c0cbf6b80bb989b
  • %User Profile%\rXLpRyuil\bf7a13ceb151457d95357fb969d2325f
  • %User Profile%\LyVyMrjTX\yfNAj.exe
  • %User Temp%\Cab1B.tmp
  • %User Temp%\Tar1D.tmp
  • %User Startup%\LyVyMrjTX.url
  • %User Profile%\rXLpRyuil\45c4fdf4a47b43d28e1389834d79a873
  • %User Profile%\rXLpRyuil\6e0f136959bd4a93a45021280d1f556d
  • %User Profile%\rXLpRyuil\0120d2af04864231800bc6797dec6293
  • %User Profile%\rXLpRyuil\0206b983678548dcbc8565d263f78ada
  • %User Temp%\tmp27.tmp
  • %User Temp%\tmp2B.tmp
  • %User Temp%\tmp2F.tmp

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\CryptnetUrlCache\MetaData
  • %User Profile%\Microsoft\CryptnetUrlCache
  • %User Profile%\CryptnetUrlCache\Content
  • %User Profile%\Application Data\rXLpRyuil
  • %User Profile%\Application Data\LyVyMrjTX

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_INJECT.XXTYN. 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 6

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %Application Data%\GDIPFONTCACHEV1.DAT


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