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TROJ_KRYPTIK.XXTXJ

August 07, 2015
 ALIASES:

PWS:Win32/Zbot (Microsoft); Trojan.Win32.Inject.vcjl (Kaspersky); Troj/Agent-ANYI (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Crypt4.BEWA (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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

260,608 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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Isypoz

HKEY_CURRENT_USER\Software\Microsoft\
Anocat

HKEY_CURRENT_USER\Software\Microsoft\
Ebol

HKEY_CURRENT_USER\Software\Microsoft\
Hioco

HKEY_CURRENT_USER\Software\Microsoft\
Ulboip

Dropping Routine

This Trojan drops the following files:

  • %Desktop%.duu
  • %User Profile%\Identities\Custom.ice
  • %User Profile%\Identities\secpol.exe

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in 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 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 Details

This Trojan deletes itself after execution.

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

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\Microsoft
    • Isypoz
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Anocat
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Ebol
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Hioco
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Ulboip

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.
  • %Desktop%.duu
  • %User Profile%\Identities\Custom.ice
  • %User Profile%\Identities\secpol.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_KRYPTIK.XXTXJ. 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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