Win32/Filecoder.GandCrab [Threat Name] go to Threat
Win32/Filecoder.GandCrab.A [Threat Variant Name]
Category | trojan |
Size | 70656 B |
Aliases | Trojan.Win32.Jorik.sbs (Kaspersky) |
Trojan.Encoder.24386 (Dr.Web) |
Short description
Win32/Filecoder.GandCrab.A is a trojan that encrypts files on fixed, removable and network drives. To decrypt files the user is requested to comply with given conditions in exchange for a password/instructions.
Installation
When executed, the trojan copies itself into the following location:
- %appdata%\Microsoft\%variable%.exe
In order to be executed on every system start, the trojan sets the following Registry entry:
- [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce]
- %variable% = %appdata%\Microsoft\%variable%.exe
A string with variable content is used instead of %variable% .
Payload information
Win32/Filecoder.GandCrab.A is a trojan that encrypts files on fixed, removable and network drives.
The trojan searches for files with the following file 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 avoids files with the following filenames:
- desktop.ini
- autorun.inf
- ntuser.dat
- iconcache.db
- bootsect.bak
- boot.ini
- ntuser.dat.log
- thumbs.db
- GDCB-DECRYPT.txt
It avoids files which contain any of the following strings in their path:
- \ProgramData\
- \Tor Browser\
- Ransomware
- \All Users\
- \Local Settings\
The trojan encrypts the file content.
The RSA, AES encryption algorithm is used.
The extension of the encrypted files is changed to:
- %originalfilename%.GDCB
To decrypt files the user is requested to comply with given conditions in exchange for a password/instructions.
When searching the drives, the trojan creates the following file in every folder visited:
- GDCB-DECRYPT.txt
It contains the following text:
Information stealing
Win32/Filecoder.GandCrab.A is a trojan that steals sensitive information.
The trojan collects the following information:
- computer name
- computer IP address
- list of disk devices and their type
- operating system version
- user name
- volume serial number
The trojan attempts to send gathered information to a remote machine.
The trojan contains a URL address. The HTTP protocol is used in the communication.
Other information
The trojan can terminate the following processes:
- agntsvc.exeagntsvc.exe
- agntsvc.exeencsvc.exe
- agntsvc.exeisqlplussvc.exe
- dbeng50.exe
- dbsnmp.exe
- excel.exe
- firefoxconfig.exe
- infopath.exe
- msaccess.exe
- mspub.exe
- mydesktopqos.exe
- mydesktopservice.exe
- mysqld.exe
- mysqld-nt.exe
- mysqld-opt.exe
- ocautoupds.exe
- ocomm.exe
- ocssd.exe
- onenote.exe
- oracle.exe
- outlook.exe
- powerpnt.exe
- sqbcoreservice.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlservr.exe
- sqlwriter.exe
- steam.exe
- synctime.exe
- tbirdconfig.exe
- thebat.exe
- thebat64.exe
- thunderbird.exe
- visio.exe
- winword.exe
- wordpad.exe
- xfssvccon.exe
The trojan executes the following command:
- %system%\wbem\wmic.exe shadowcopy delete
The trojan may execute the following commands:
- %windir%\system32\wbem\wmic.process call create "cmd /c start %malwarefilename%"
Trojan detects the presence of the following applications:
- AVP.EXE
- ashDisp.exe
- avengine.exe
- avgnt.exe
- cfp.exe
- cmdagent.exe
- ekrn.exe
- fsguiexe.exe
- Mcshield.exe
- msmpeng.exe
- NortonAntiBot.exe
- pccpfw.exe
- persfw.exe
- smc.exe
The trojan can open the following URLs:
- %paymentinformationurl%