RANSOM_STINGER.THCBOAH
Trojan-Ransom.Win32.CryFile.zxf (KASPERSKY); Troj/Stingran-A (SOPHOS-LITE); Ransom:Win32/Stylcrypt.A (MICROSOFT)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
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 encrypts files found in specific folders. 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 adds the following processes:
- Notepad %System Root%\About .Stinger unlocking instructions.txt
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .1cd
- .3dm
- .3ds
- .3fr
- .3g2
- .3gp
- .3pr
- .7z
- .7zip
- .aac
- .ab4
- .abd
- .acc
- .accdb
- .accde
- .accdr
- .accdt
- .ach
- .acr
- .act
- .adb
- .adp
- .ads
- .agdl
- .ai
- .aiff
- .ait
- .al
- .aoi
- .apj
- .apk
- .arw
- .ascx
- .asf
- .asm
- .asp
- .aspx
- .asset
- .asx
- .atb
- .avi
- .awg
- .back
- .backup
- .backupdb
- .bak
- .bank
- .bay
- .bdb
- .bgt
- .bik
- .bin
- .bkp
- .blend
- .bmp
- .bpw
- .bsa
- .c
- .cash
- .cdb
- .cdf
- .cdr
- .cdr3
- .cdr4
- .cdr5
- .cdr6
- .cdrw
- .cdx
- .ce1
- .ce2
- .cer
- .cfg
- .cfn
- .cgm
- .cib
- .class
- .cls
- .cmt
- .config
- .contact
- .cpi
- .cpp
- .cr2
- .craw
- .crt
- .crw
- .cry
- .cs
- .csh
- .csl
- .css
- .csv
- .d3dbsp
- .dac
- .das
- .dat
- .db
- .db_journal
- .db3
- .dbf
- .dbx
- .dc2
- .dcr
- .dcs
- .ddd
- .ddoc
- .ddrw
- .dds
- .def
- .der
- .des
- .design
- .dgc
- .dgn
- .dit
- .djvu
- .dng
- .doc
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .drf
- .drw
- .dtd
- .dwg
- .dxb
- .dxf
- .dxg
- .edb
- .eml
- .eps
- .erbsql
- .erf
- .exf
- .fdb
- .ffd
- .fff
- .fh
- .fhd
- .fla
- .flac
- .flb
- .flf
- .flv
- .flvv
- .forge
- .fpx
- .fxg
- .gbr
- .gho
- .gif
- .gray
- .grey
- .groups
- .gry
- .h
- .hbk
- .hdd
- .hpp
- .html
- .ibank
- .ibd
- .ibz
- .idx
- .iif
- .iiq
- .incpas
- .indd
- .info
- .info_
- .ini
- .iwi
- .jar
- .java
- .jnt
- .jpe
- .jpeg
- .jpg
- .js
- .json
- .k2p
- .kc2
- .kdbx
- .kdc
- .key
- .kpdx
- .kwm
- .laccdb
- .lbf
- .lck
- .ldf
- .lit
- .litemod
- .litesql
- .lock
- .log
- .ltx
- .lua
- .m
- .m2ts
- .m3u
- .m4a
- .m4p
- .m4v
- .ma
- .mab
- .mapimail
- .max
- .mbx
- .md
- .mdb
- .mdc
- .mdf
- .mef
- .mfw
- .mid
- .mkv
- .mlb
- .mmw
- .mny
- .money
- .moneywell
- .mos
- .mov
- .mp3
- .mp4
- .mpeg
- .mpg
- .mrw
- .msf
- .msg
- .myd
- .nd
- .ndd
- .ndf
- .nef
- .nk2
- .nop
- .nrw
- .ns2
- .ns3
- .ns4
- .nsd
- .nsf
- .nsg
- .nsh
- .nvram
- .nwb
- .nx2
- .nxl
- .nyf
- .oab
- .obj
- .odb
- .odc
- .odf
- .odg
- .odm
- .odp
- .ods
- .odt
- .ogg
- .oil
- .omg
- .one
- .orf
- .ost
- .otg
- .oth
- .otp
- .ots
- .ott
- .p12
- .p7b
- .p7c
- .pab
- .pages
- .pas
- .pat
- .pbf
- .pcd
- .pct
- .pdb
- .pdd
- .pef
- .pem
- .pfx
- .php
- .pif
- .pl
- .plc
- .plus_muhd
- .pm!
- .pm
- .pmi
- .pmj
- .pml
- .pmm
- .pmo
- .pmr
- .pnc
- .pnd
- .png
- .pnx
- .pot
- .potm
- .potx
- .ppam
- .pps
- .ppsm
- .ppsx
- .ppt
- .pptm
- .pptx
- .prf
- .private
- .ps
- .psafe3
- .psd
- .pspimage
- .pst
- .ptx
- .pub
- .pwm
- .py
- .qba
- .qbb
- .qbm
- .qbr
- .qbw
- .qbx
- .qby
- .qcow
- .qcow2
- .qed
- .qtb
- .r3d
- .raf
- .rar
- .rat
- .raw
- .rdb
- .re4
- .rm
- .rtf
- .rvt
- .rw2
- .rwl
- .rwz
- .s3db
- .safe
- .sas7bdat
- .sav
- .save
- .say
- .sd0
- .sda
- .sdb
- .sdf
- .sh
- .sldm
- .sldx
- .slm
- .sql
- .sqlite
- .sqlite3
- .sqlitedb
- .sqlite-shm
- .sqlite-wal
- .sr2
- .srb
- .srf
- .srs
- .srt
- .srw
- .st4
- .st5
- .st6
- .st7
- .st8
- .stc
- .std
- .sti
- .stl
- .stm
- .stw
- .stx
- .svg
- .swf
- .sxc
- .sxd
- .sxg
- .sxi
- .sxm
- .sxw
- .tax
- .tbb
- .tbk
- .tbn
- .tex
- .tga
- .thm
- .tif
- .tiff
- .tlg
- .tlx
- .txt
- .upk
- .usr
- .vbox
- .vdi
- .vhd
- .vhdx
- .vmdk
- .vmsd
- .vmx
- .vmxf
- .vob
- .vpd
- .vsd
- .wab
- .wad
- .wallet
- .war
- .wav
- .wb2
- .wma
- .wmf
- .wmv
- .wpd
- .wps
- .x11
- .x3f
- .xis
- .xla
- .xlam
- .xlk
- .xlm
- .xlr
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .xps
- .xxx
- .ycbcra
- .yuv
- .zip
It encrypts files found in the following folders:
- %System Root%
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It drops the following file(s) as ransom note:
- {Folders with affected files}\About .Stinger unlocking instructions.txt
- %System Root%\About .Stinger unlocking instructions.txt
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It leaves text files that serve as ransom notes containing the following text:
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
Identify and terminate files detected as RANSOM_STINGER.THCBOAH
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Search and delete these files
- {Folders with affected files}\About .Stinger unlocking instructions.txt
- %System Root%\About .Stinger unlocking instructions.txt
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_STINGER.THCBOAH. 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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