RANSOM_HCSIX.A
Trojan-Ransom.Win32.Crypren.aeaa (Kaspersky), Ransom.CryptXXX (Norton)
Windows

Threat Type: Ransomware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It encrypts files with specific file extensions. It drops files as ransom note.
TECHNICAL DETAILS
Arrival Details
This Ransomware 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 Ransomware drops the following files:
- %User Temp%\_MEI{Random numbers}\win32api.pyd
- %User Temp%\_MEI{Random numbers}\Crypto.Cipher._AES.pyd
- %User Temp%\_MEI{Random numbers}\Crypto.Hash._SHA256.pyd
- %User Temp%\_MEI{Random numbers}\Microsoft.VC90.CRT.manifest
- %User Temp%\_MEI{Random numbers}\_hashlib.pyd
- %User Temp%\_MEI{Random numbers}\bz2.pyd
- %User Temp%\_MEI{Random numbers}\msvcm90.dll
- %User Temp%\_MEI{Random numbers}\msvcp90.dll
- %User Temp%\_MEI{Random numbers}\msvcr90.dll
- %User Temp%\_MEI{Random numbers}\python27.dll
- %User Temp%\_MEI{Random numbers}\pywintypes27.dll
- %User Temp%\_MEI{Random numbers}\quiltersvc.exe.manifest
- %User Temp%\_MEI{Random numbers}\select.pyd
- %User Temp%\_MEI{Random numbers}\unicodedata.pyd
- %User Temp%\_MEI{Random numbers}\win32api.pyd
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.)
It creates the following folders:
- %User Temp%\_MEI{Random numbers}
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.)
Other Details
This Ransomware does the following:
- It encrypts all files in fixed and network drives.
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .bak
- .bar
- .bay
- .bc6
- .bc7
- .big
- .bik
- .biz
- .bkf
- .bkp
- .blob
- .bmp
- .brd
- .bsa
- .cas
- .cdr
- .cer
- .cfr
- .cgm
- .class
- .cmd
- .cpp
- .cr2
- .crt
- .crw
- .csr
- .css
- .csv
- .d3dbsp
- .das
- .dazip
- .db0
- .dbf
- .dbfv
- .dch
- .dcr
- .der
- .desc
- .dif
- .dip
- .djv
- .djvu
- .dmp
- .dng
- .doc
- .docb
- .docm
- .docm
- .docx
- .DOT
- .dotm
- .dotx
- .dwg
- .dxg
- .epk
- .eps
- erf
- .esm
- .exe
- .ff
- .fla
- .flv
- .forge
- .fos
- .fpk
- .frm
- fsh
- .gdb
- .gho
- .gpg
- .hkdb
- .hkx
- .hplg
- .htm
- .html
- .hvpl
- .hwp
- .ibank
- .ibd
- .icxs
- .indd
- .itdb
- .itl
- .itm
- .iwd
- .iwi
- .jar
- .java
- .jpeg
- .jpeg
- .jpg
- .js
- .kdb
- .kdc
- .key
- .kf
- .lay
- .lay6
- .layout
- .lbf
- .ldf
- .litemod
- .lrf
- .ltx
- .lvl
- .m2
- m3u
- .m4a
- .map
- .max
- .mcgame
- .mcmeta
- .mdb
- .mdbackup
- .mddata
- .mdf
- .mef
- .menu
- .mid
- .mkv
- .mlx
- .mml
- .mov
- .mp3
- .mpeg
- .mpg
- .mpqge
- .mrwref
- .ms11 (Security copy)
- .MYD
- .MYI
- .ncf
- .NEF
- .nrw
- .ntl
- .ocx
- .odb
- .odc
- odm
- .odp
- .ods
- .ods
- .odt
- .orf
- .otg
- .ots
- .ott
- .p12
- .p7b
- .p7c
- .pak
- .PAQ
- .pas
- .pdd
- .pef
- .pem
- .pfx
- php
- .pkpass
- .pl
- .png
- .ppam
- .ppsm
- .ppsx
- .ppt
- .pptm
- .pptx
- .psd
- .psk
- .pst
- .ptx
- .py
- .qcow2
- .qdf
- .qic
- .r3d
- .raf
- .rar
- .raw
- .rb
- .re4
- .rgss3a
- .rim
- .rofl
- .rtf
- .rw2
- .rwl
- .sav
- .sb
- .sc2save
- .sch
- .sid
- .sidd
- .sidn
- .sie
- .sis
- .sldm
- .sldx
- .slk
- .slm
- .snx
- .sql
- .SQLITE3
- .SQLITEDB
- .sr2
- .srf
- .srt
- .sv
- .tbk
- .tgz
- .tif
- .tiff
- .tor
- .txt
- .unity3d
- .uot
- .upk
- .upx
- .vbs
- .vdf
- .vdi
- .vfs0
- .vmdk
- .vmx
- vob
- .vpk
- .vpp_pc
- .vtf
- .w3x
- .wav
- .wb2
- .wma
- .wmo
- .wmv
- .wmx
- .wotreplay
- .wpd
- .wps
- .x3f
- .xf
- .xlc
- .xlk
- .xls
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xlw
- .xml
- .xxx
- .zip
- .ztmp
It drops the following file(s) as ransom note:
- {File Directory}\recover_your_files.txt
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
Search and delete this file
- %User Temp%\_MEI{Random numbers}\win32api.pyd
- %User Temp%\_MEI{Random numbers}\Crypto.Cipher._AES.pyd
- %User Temp%\_MEI{Random numbers}\Crypto.Hash._SHA256.pyd
- %User Temp%\_MEI{Random numbers}\Microsoft.VC90.CRT.manifest
- %User Temp%\_MEI{Random numbers}\_hashlib.pyd
- %User Temp%\_MEI{Random numbers}\bz2.pyd
- %User Temp%\_MEI{Random numbers}\msvcm90.dll
- %User Temp%\_MEI{Random numbers}\msvcp90.dll
- %User Temp%\_MEI{Random numbers}\msvcr90.dll
- %User Temp%\_MEI{Random numbers}\python27.dll
- %User Temp%\_MEI{Random numbers}\pywintypes27.dll
- %User Temp%\_MEI{Random numbers}\quiltersvc.exe.manifest
- %User Temp%\_MEI{Random numbers}\select.pyd
- %User Temp%\_MEI{Random numbers}\unicodedata.pyd
- %User Temp%\_MEI{Random numbers}\win32api.pyd
Step 4
Search and delete these folders
- %User Temp%\_MEI{Random numbers}
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_HCSIX.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 the following Trend Micro Support pages for more information:
Step 6
Restore encrypted files from backup.
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