TROJ_CRYPTCOIN.AK
Ransom-FPS!4D46310BDFDC (McAfee),a variant of MSIL/Kryptik.AKO (ESET)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
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 connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
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
- .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:
![](http://www.trendmicro.com/vinfo/resources/images/TROJ_CRYPTCOIN_AK_img1.jpg)
SOLUTION
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
Step 5
Delete this registry value
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}"
- 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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