RANSOM_KASISKI.A
Trojan.Ransom.Kasiski (ALYac); Python/Filecoder.Kasiski.A (ESET-NOD32); Python/Filecoder_Kasiski.A!tr (Fortinet); Ransom.Kasiski (Malwarebytes)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Dropped by other malware, 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 is capable of encrypting files in the affected system.
TECHNICAL DETAILS
14,648,721 bytes
EXE
No
17 Feb 2017
Encrypts files, Drops files
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 the following files:
- C:\Programfiles\DOCS_r\R\S\W\CURRICULUM.pdf
- {malware path}\key.txt
- C:\Programfiles\DOCS_r\R\S\W\dis.txt
- {malware path}\wpm.jpg - ransom note wallpaper
- {malware path}\INSTRUCCIONES.txt - ransom note
Other Details
This Trojan encrypts files with the following extensions:
- aes
- ARC
- asc
- asf
- asm
- asp
- avi
- bak
- bat
- bmp
- brd
- bz2
- cgm
- class
- cmd
- cpp
- crt
- csr
- CSV
- dbf
- dch
- dif
- dip
- djv
- djvu
- DOC
- docb
- docm
- docx
- DOT
- dotm
- dotx
- fla
- flv
- frm
- gif
- gpg
- hwp
- ibd
- jar
- java
- jpeg
- jpg
- key
- lay
- lay6
- ldf
- max
- mdb
- mdf
- mid
- mkv
- mml
- mov
- mpeg
- mpg
- ms11
- MYD
- MYI
- NEF
- odb
- odg
- odp
- ods
- odt
- otg
- otp
- ots
- ott
- PAQ
- pas
- pem
- php
- png
- pot
- potm
- potx
- ppam
- pps
- ppsm
- ppsx
- PPT
- pptm
- pptx
- psd
- qcow2
- rar
- raw
- RTF
- sch
- sldm
- sldx
- slk
- sql
- SQLITE3
- SQLITEDB
- stc
- std
- sti
- stw
- svg
- swf
- sxc
- sxd
- sxi
- sxm
- sxw
- tar
- tar
- tbk
- tgz
- tif
- tiff
- uop
- uot
- vbs
- vdi
- vmdk
- vmx
- vob
- wav
- wks
- wma
- wmv
- xlc
- xlm
- XLS
- xlsb
- xlsm
- xlsx
- xlt
- xltm
- xltx
- xlw
- xml
- zip
It renames encrypted files using the following names:
- [KASISKI]{original filename}
It does the following:
- It sends the message "hello : my friend" to this email address: pfi333555@gmail.com
- It encrypts files on drives C:, D:, E:, and F:
It is capable of encrypting files in the affected system.
NOTES:
The wallpaper contains the following message:
TODOS SUS ARCHIVOS FUERON ENCRYPTADOS
TODOS SUS ARCHIVOS FUERON ENCRYPTADOS
PARA RECUPERARLOS ABRA EL DOCUMENTO
'INSTRUCCIONES.txt' QUE SE ENCUENTRA EN SU
ESCRITORIO Y SIGA LAS INSTRUCCIONES QUE
ALLI LE INDICA.
The ransom note contains the following message:
SOLUTION
9.850
13.228.00
17 Feb 2017
13.229.00
18 Feb 2017
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
Search and delete this file
- C:\Programfiles\DOCS_r\R\S\W\CURRICULUM.pdf
- C:\ProgramFiles\DOCS_r\R\S\W\dis.txt
- {malware path}\wpm.jpg
- {malware path}\INSTRUCCIONES.txt
- {malware path}\key.txt
Step 4
Search and delete this folder
- C:\Programfiles
Step 5
Reset your Desktop properties
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_KASISKI.A. 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.
Step 7
Restore encrypted files from backup.
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