Analysis by: Michelle Morales
ALIASES:

TrojanDownloader:Win32/Neojit.A (Microsoft), Trojan-Downloader.Win32.Neojit (Ikarus)

 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.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 256,512 bytes
File Type: , EXE
Memory Resident: No
Initial Samples Received Date: 24 Feb 2014

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 and executes the following files:

  • %All Users Profile%\{random folder name}\{random file name}.exe - also detected as TROJ_NEOJIT.SMX

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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 creates the following folders:

  • %All Users Profile%\{random folder name}

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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
{random characters} = %All Users Profile%\{random folder name}\{random file name}.exe

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\08e646bd85cae68e96c119698aab08a2

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\SOFTWARE\08e646bd85cae68e96c119698aab08a2
c25659e1304291778a29fc7ea46e145a = "47,49,46,38,87,75,cc,90,4f,35,77,ab,b1,af,b2,5d,2c,bb,aa,f7,e2,65,b6,44,a7,31,b3,50,29,28,e7,bf,2e,f1,21,f5,5c,f6,1f,a8,1d,a7,57,bd,a5,c6,a6,85,73,02,20,37,69,12,ec,1a,d5,82,2f,c2,39,ae,20,4d,3a,33,04,04,cc,9e,29,4b,a8,c7,82,4b,36,c7,90,a6,17,c2,70,d1,39,13,98,2e,b3,87,9c,e7,b9,db,45,be,fb,43,9d,97,11,fb,18,3d,fc,91,62,6f,07,71,75,13,82,94,00,37,69,83,ed,e8,96,40,fa,70,5c,9b,c6,3c,8e,c5,41,87,7c,d9,8b,ab,19,d7,05,3b,c5,71,e1,e5,c7,e4,33,d6,69,12,3d,3d,00,e0,59,21,fe,7e,65,5c,09,e5,01,61,18,da,1d,0b,1d,81,c4,6f,30,92,54,c2,d2,72,56,a7,48,90,af,fb,13,d6,af,e4,8d,de,74,3c,cc,65,d1,e0,5f,fb,7a,7b,cc,04,e7,fe,80,26,d6,b5,d0,b4,f5,e1,eb,32,bb,2f,43,22,fa,02,6f,6e,75,e9,7a,a6,63,87,a9,3b,18,0b,cd,c6,37,9f,35,94,42,b5,76,82,01,96,89,62,fc,3d,c3,f3,bd,31,6e,fc,f7,98,09,a0,01,80,7c,09,7c,fb,c8,82,07,b9,b0,36,63,14,7c,d5,51,f6,7f,c3,6d,2b,f2,43,3c,12,8c,48,45,4c,11,c2,26,73,19,7a,89,5a,db,d6,82,99,f0,43,14,b6,67,51,56,95,29,62,0d,7a,23,d3,3f,e4,4f,ef,c5,2c,5e,04,92,61,d4,bb,e9,0e,c3,36,52,ef,15,5d,e1,bd,dd,d4,e3,23,5f,be,bb,"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://c.{BLOCKED}g.com.br
  • http://w.{BLOCKED}x.com
  • http://db.{BLOCKED}ech.com

It deletes the initially executed copy of itself

  SOLUTION

Minimum Scan Engine: 9.700
VSAPI OPR PATTERN File: 10.627.00
VSAPI OPR PATTERN Date: 24 Feb 2014

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
    • {random characters} = "%All Users Profile%\{random folder name}\{random file name}.exe"

Step 5

Delete this registry key

[ 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.

  • HKEY_CURRENT_USER\SOFTWARE\08e646bd85cae68e96c119698aab08a2

Step 6

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.
  • %All Users Profile%\{random folder name}

Step 7

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


Did this description help? Tell us how we did.