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TrojanSpy.Win32.ICEDID.AF

February 22, 2019
 Analysis by: Noel Anthony Llimos
 ALIASES:

Win32/GenKryptik.CZNA trojan (NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It injects its dropped file/component to specific processes.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

274,432 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

15 Feb 2019

Arrival Details

This Trojan Spy 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 Spy drops the following copies of itself into the affected system:

  • %All Users Profile%\{GUID}\{6-14 random characters}.exe

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000, XP, and Server 2003, or C:\ProgramData on Windows Vista, 7, and 8. )

It drops the following file(s)/component(s):

  • %All Users Profile%\{5-7 random character}\{8 random character}.dat

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000, XP, and Server 2003, or C:\ProgramData on Windows Vista, 7, and 8. )

It adds the following processes:

  • %System%\svchost.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %All Users Profile%\{5-7 random character}

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000, XP, and Server 2003, or C:\ProgramData on Windows Vista, 7, and 8. )

It stays memory-resident by creating remote threads:

  • explorer.exe - {requires reboot}
  • svchost.exe - {requires reboot}
  • winlogon.exe - {requires reboot}

It injects its dropped file/component to the following processes:

  • %System%\svchost.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Information Theft

This Trojan Spy gathers the following data:

  • Auto-fill Data
  • Browsing History
  • CPU Information
  • Connected Devices
  • List of Directories
  • HTTP Posts responses
  • Installed Applications
  • Internet Cookies
  • Internet Credentials (Internet Explorer, Microsoft Edge, Google Chrome, Mozilla Firefox) through web injection and traffic tunneling.
  • Computer Machine Name
  • Network Information
  • OS Version
  • Username
  • Usernames and Passwords
  • Workgroup

Other Details

This Trojan Spy connects to the following website to send and receive information:

  • https://cr{BLOCKED}sti.c{BLOCKED}n.php

It does the following:

  • It propagates by dropping a copy of itself in the network share folder where the directory is:
    • (network)\ADMIN\{6-14 random characters}.exe

It adds the following scheduled tasks:

  • Task Name: {GUID}
    • Task Trigger: At every system logon
    • Task Action: Execution of the Dropped Copy
    • Details: %All Users Profile%\{GUID}\{6-14 random characters}.exe

(Note: %All Users Profile% is the common user's profile folder, which is usually C:\Documents and Settings\All Users on Windows 2000, XP, and Server 2003, or C:\ProgramData on Windows Vista, 7, and 8. )

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.826.02

FIRST VSAPI PATTERN DATE:

20 Feb 2019

VSAPI OPR PATTERN File:

14.827.00

VSAPI OPR PATTERN Date:

21 Feb 2019

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

Deleting Scheduled Tasks

The following {Task Name} - {Task to be run} listed should be used in the steps identified below:

  • {GUID} - %All Users Profile%\{GUID}\{6-14 random characters}.exe

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Open the Windows Scheduled Tasks. Click Start>Programs>Accessories>
    System Tools>Scheduled Tasks.
  2. Locate each {Task Name} values listed above in the Name column.
  3. Right-click on the said file(s) with the aforementioned value.
  4. Click on Properties. In the Run field, check for the listed {Task to be run}.
  5. If the strings match the list above, delete the task.

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:

  1. Open the Windows Task Scheduler. To do this:
    • On Windows Vista, Windows 7, and Windows Server 2008, click Start, type taskschd.msc in the Search input field, then press Enter.
    • On Windows 8, Windows 8.1, and Windows Server 2012, right-click on the lower left corner of the screen, click Run, type taskschd.msc, then press Enter.
  2. In the left panel, click Task Scheduler Library.
  3. In the upper-middle panel, locate each {Task Name} values listed above in the Name column.
  4. In the lower-middle panel, click the Actions tab. In the Details column, check for the {Task to be run} string.
  5. If the said string is found, delete the task.

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.  
  • %All Users Profile%\{GUID}\{6-14 random characters}.exe
  • %All Users Profile%\{5-7 random character}\{8 random character}.dat

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%\{5-7 random character}

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.ICEDID.AF. 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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