RANSOM_CHIP.C
Trojan:Win32/Dynamer!ac (Microsoft); W32/Snocry.A!tr (Fortinet)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 retrieves specific information from the affected system.
It connects to certain websites to send and receive information. It deletes itself after execution.
TECHNICAL DETAILS
315,392 bytes
EXE
No
17 Apr 2017
Connects to URLs/IPs, Encrypts files
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:
- {folder containing encrypted files}\ATLAS_FILES.txt - ransom note
- {fixed and removable disk drive letter}\{6 random characters} - dummy file to check if the drive is writable, file is deleted after checking
It drops and executes the following files:
- %User Profile%\bye.bat - terminates the malware process, then deletes the malware file and this batch file afterwards
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Information Theft
This Ransomware 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 Ransomware 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:
- http://{BLOCKED}.{BLOCKED}.7.69/index.php
It encrypts files with the following extensions:
- .000
- .001
- .002
- .2015
- .3ds
- .3fr
- .500
- .7z
- .accdb
- .ai
- .amj
- .apk
- .arch00
- .arw
- .asc
- .asset
- .avi
- .az
- .bar
- .bay
- .bc6
- .bc7
- .bd2
- .big
- .bik
- .bkf
- .bkp
- .blob
- .bpn
- .bsa
- .cab
- .cas
- .cdr
- .cdt
- .cer
- .cfp
- .cfr
- .cr2
- .crt
- .crw
- .crypto
- .cryptobyte
- .css
- .csv
- .d3dbsp
- .dac
- .das
- .dat
- .dazip
- .db
- .db0
- .dba
- .dbf
- .dcr
- .der
- .desc
- .dmp
- .dng
- .doc
- .docm
- .docx
- .dwg
- .dxg
- .ebc
- .ebq
- .enz
- .epb
- .epk
- .eps
- .erf
- .esm
- .ets
- .fdb
- .ff
- .flv
- .forge
- .fos
- .fpk
- .fsh
- .gdb
- .gho
- .gpc
- .hkdb
- .hkx
- .hplg
- .hvpl
- .ibank
- .icxs
- .IIF
- .indd
- .inf
- .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
- .mdbackup
- .mddata
- .mdf
- .mef
- .menu
- .mlx
- .mmm
- .mny
- .mov
- .mp4
- .mpqge
- .mrwref
- .myd
- .mye
- .myo
- .myob
- .myox
- .mysql
- .ncf
- .nd
- .nrw
- .ntl
- .odb
- .odc
- .odm
- .odp
- .ods
- .odt
- .ofx
- .onion
- .orf
- .p12
- .p7b
- .p7c
- .pak
- .pdd
- .pef
- .pem
- .pfx
- .pkpass
- .png
- .ppt
- .pptm
- .pptx
- .psb
- .psd
- .psk
- .pst
- .ptb
- .ptx
- .py
- .qba
- .qbatlg
- .qbb
- .qbk
- .qbm
- .qbmb
- .qbo
- .qbw
- .qbx
- .qby
- .qdf
- .qfx
- .qic
- .qif
- .qsd
- .qtx
- .r3d
- .raf
- .rar
- .raw
- .rb
- .re4
- .rgss3a
- .rim
- .rofl
- .rtf
- .rw2
- .rwl
- .sai
- .saj
- .sav
- .sb
- .sdb
- .sid
- .sidd
- .sidn
- .sie
- .sis
- .slm
- .snx
- .sql
- .sr2
- .srf
- .srw
- .sum
- .svg
- .syncdb
- .t11
- .t12
- .t13
- .t14
- .t15
- .t16
- .t17
- .tax
- .tax2013
- .tax2014
- .tax2015
- .tax2016
- .tax2017
- .tiff
- .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
- .xtbl
- .xxx
- .zip
- .ztmp
It renames encrypted files using the following names:
- {original filename and extension}.ATLAS
It does the following:
- This ransomware deletes all shadow copies by executing the following command:
vssadmin delete shadows /all /quiet - It avoids encrypting files containing any of the strings in its full path name:
- C:\Windows\
- C:\Program Files\
- C:\ProgramData\
- C:\Documents and Settings\All Users\
- C:\Users\{username}\AppData\
- C:\Documents and Settings\{username}\Application Data\
- %PROGRAMFILE\
- microsoft
- Microsoft
- $Recycle.Bin
- RECYCLER
- $RECYCLE.BIN
- It encrypts files in fixed, removable, RAM disk drives, and network shares.
It deletes itself after execution.
NOTES:
The ransom note ATLAS_FILES.txt contains the following:
SOLUTION
9.850
13.352.02
20 Apr 2017
13.353.00
21 Apr 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 these files
- {folder containing encrypted files}\ATLAS_FILES.txt
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_CHIP.C. 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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