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TROJ_CRYPTCOIN.AK

November 20, 2014
 ALIASES:

Ransom-FPS!4D46310BDFDC (McAfee),a variant of MSIL/Kryptik.AKO (ESET)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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 connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

548,864 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Nov 2014

Payload:

Connects to URLs/IPs, Displays graphics/image

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.

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
Vault = "{malware path and filename}"

Other System Modifications

This Trojan sets the system's desktop wallpaper to the following image:

Information Theft

This Trojan gathers the following data:

  • HWID
  • Computer Name
  • User Name

Other Details

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

  • cvredirect.{BLOCKED}p.net
  • cvredirect.{BLOCKED}s.net

It encrypts files with the following extensions:

  • .3fr
  • .accdb
  • .arw
  • .bay
  • .bmp
  • .cdr
  • .cer
  • .cr2
  • .crt
  • .crw
  • .dbf
  • .dcr
  • .der
  • .dng
  • .docm
  • .docx
  • .doc
  • .dwg
  • .dxf
  • .dxg
  • .eps
  • .erf
  • .exif
  • .gif
  • .indd
  • .jfif
  • .jpeg
  • .jpg
  • .kdc
  • .mdb
  • .mdf
  • .mef
  • .mp3
  • .mrw
  • .nef
  • .nrw
  • .odb
  • .odc
  • .odm
  • .odp
  • .ods
  • .odt
  • .orf
  • .p12
  • .p7b
  • .p7c
  • .pdd
  • .pdf
  • .pef
  • .pem
  • .pfx
  • .png
  • .pptm
  • .pptx
  • .ppt
  • .pptx
  • .psd
  • .pst
  • .ptx
  • .r3d
  • .raf
  • .raw
  • .rtf
  • .rw2
  • .rwl
  • .sr2
  • .srf
  • .srw
  • .txt
  • .wb2
  • .wpd
  • .wps
  • .x3f
  • .xlk
  • .xlsb
  • .xls
  • .xlsm
  • .xlsx

However, as of this writing, the said sites are inaccessible.

NOTES:

After successfully encrypting files on the targeted system, this Trojan displays the following user interface:

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.274.01

FIRST VSAPI PATTERN DATE:

13 Nov 2014

VSAPI OPR PATTERN File:

11.275.00

VSAPI OPR PATTERN Date:

14 Nov 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

Scan your computer with your Trend Micro product and note files detected as TROJ_CRYPTCOIN.AK

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

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
    • Vault = "{malware path and filename}"

Step 6

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