RANSOM_CHIP.A
Crypt6.MTR (AVG); Win32/Filecoder.CHIP.A (ESET-NOD32); Trojan-Ransom.ChipCrypter (Ikarus)
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 retrieves specific information from the affected system.
It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible. It deletes itself after execution.
TECHNICAL DETAILS
223,744 bytes
EXE
No
18 Nov 2016
Connects to URLs/IPs, Encrypts 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:
- {fixed and removable disk drive letter}\{6 random characters} (dummy file to check if the drive is writable, file is deleted after checking)
- {folder containing encrypted files}\CHIP_FILES.txt (ransom note)
It drops and executes the following files:
- bye.bat (terminates the malware process, then deletes the malware file and this batch file afterwards)
Information Theft
This Trojan retrieves the following information from the affected system:
- Windows Version and Processor Type
- Drive Letters of Available and Writable Disk Drives
- Computer Name
- Windows Directory
- External IP Address
Other Details
This Trojan connects to the following URL(s) to get the affected system's IP address:
- checkip.dyndns.org
It connects to the following website to send and receive information:
- {BLOCKED}.{BLOCKED}.82.8/index.php
It encrypts files with the following extensions:
- 001
- 2015
- 3ds
- 3fr
- 500
- 7z
- accdb
- accdb
- ai
- amj
- apk
- arch00
- arw
- asc
- asset
- avi
- bar
- bay
- bc6
- bc7
- big
- bik
- bkf
- bkp
- blob
- bpn
- bsa
- cab
- cas
- cdr
- cdt
- cer
- cfp
- cfr
- cr2
- crt
- crw
- css
- csv
- d3dbsp
- dac
- das
- dazip
- db
- db0
- dba
- dbf
- dcr
- der
- desc
- dmp
- dng
- doc
- docm
- docx
- dwg
- dwg
- dxg
- ebc
- ebq
- epb
- epk
- eps
- erf
- esm
- ets
- fdb
- ff
- flv
- forge
- fos
- fpk
- fsh
- gdb
- gdb
- gho
- gpc
- hkdb
- hkx
- hplg
- hvpl
- ibank
- icxs
- IIF
- indd
- ipt
- itdb
- itf
- itl
- itm
- iwd
- iwi
- jpe
- jpeg
- jpg
- js
- kdb
- kdc
- kf
- layout
- lbf
- lgb
- litemod
- lrf
- ltx
- lvl
- m2
- m3u
- m4a
- map
- max
- mcmeta
- mdb
- mdb
- mdbackup
- mddata
- mdf
- mef
- menu
- mlx
- mny
- mov
- mp4
- mpqge
- mrwref
- myd
- mye
- myox
- mysql
- ncf
- nd
- nrw
- ntl
- odb
- odc
- odm
- odp
- ods
- odt
- ofx
- orf
- p12
- p7b
- p7c
- pak
- pdd
- pef
- pem
- pfx
- pkpass
- png
- ppt
- pptm
- pptx
- psb
- psd
- psd
- psk
- pst
- ptb
- ptb
- ptx
- py
- qba
- qbatlg
- qbb
- qbk
- qbm
- qbmb
- qbo
- qbw
- qbx
- qby
- qdf
- qdf
- qfx
- qic
- qif
- qsd
- qtx
- r3d
- raf
- rar
- raw
- rb
- re4
- rgss3a
- rim
- rofl
- rtf
- rw2
- rwl
- sai
- saj
- sav
- sb
- sdb
- sdb
- sid
- sidd
- sidn
- sie
- sis
- slm
- snx
- sql
- sr2
- srf
- srw
- sum
- svg
- syncdb
- t11
- t12
- t12
- t13
- t13
- t14
- t15
- tax
- tax
- tax2013
- tax2014
- tax2015
- tax2016
- tlg
- tor
- tt14
- tt15
- tt16
- txf
- txt
- upk
- vbk
- vcf
- vdf
- vfs0
- vmx
- vpk
- vpp_pc
- vtf
- w3x
- wallet
- wb2
- wma
- wmo
- wmv
- wotreplay
- wpd
- wps
- x3f
- xf
- xlk
- xls
- xlsb
- xlsm
- xlsx
- xml
- xxx
- zip
- ztmp
It renames encrypted files using the following names:
- {original filename and extension}.CHIP
It does the following:
- This ransomware deletes all shadow copies by executing the following command:
vssadmin delete shadows /all /quiet - It prevents encrypting files containing any of the strings in its full path name:
- C:\WINDOWS\
- $Recycle.bin
- $RECYCLE.BIN
- %PROGRAMFILE\
- C:\Documents and Settings\All Users\
- C:\Program Files\
- microsoft
- RECYCLER
- It encrypts files in fixed, removable, RAM disk drives, and network shares.
However, as of this writing, the said sites are inaccessible.
It deletes itself after execution.
NOTES:
The ransom note CHIP_FILES.txt contains the following:
SOLUTION
9.850
12.906.09
19 Nov 2016
12.907.00
20 Nov 2016
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 these files
- {folder containing encrypted files}\CHIP_FILES.txt
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_CHIP.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 5
Restore encrypted files from backup.
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