RANSOM_CRYPFIRAGO.A

 Analysis by: Rhena Inocencio

 ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft), a variant of Win32/Injector.CPGP (ESET)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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.

  TECHNICAL DETAILS

File Size:

169,746 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

30 Dec 2015

Payload:

Encrypts files, Displays message/message boxes

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:

  • {folders containing encrypted files}\FILESAREGONE.TXT - ransom note
  • {folders containing encrypted files}\IHAVEYOURSECRET.KEY

Other System Modifications

This Trojan modifies the following file(s):

  • It encrypts files and appends the extension .fuck

Other Details

This Trojan encrypts files with the following extensions:

  • AccLR
  • cab
  • dng
  • doc
  • docm
  • docx
  • dot
  • dotm
  • dotx
  • drf
  • drw
  • dtd
  • dwg
  • dxb
  • dxf
  • dxg
  • eml
  • epk
  • eps
  • erbsql
  • erf
  • esm
  • exf
  • fdb
  • ff
  • ffd
  • fff
  • fh
  • fhd
  • fla
  • flac
  • flv
  • forge
  • fos
  • fpk
  • fpx
  • fsh
  • fxg
  • gdb
  • gho
  • gray
  • grey
  • gry
  • h
  • hbk
  • hkdb
  • hkx
  • hplg
  • hpp
  • hvpl
  • ibank
  • ibd
  • ibz
  • icxs
  • idx
  • iif
  • iiq
  • incpas
  • indd
  • itdb
  • itl
  • itm
  • iso
  • iwd
  • iwi
  • java
  • jpe
  • jpeg
  • jpg
  • js
  • kc2
  • kdb
  • kdbx
  • kdc
  • key
  • kf
  • kpdx
  • layout
  • lbf
  • litemod
  • lrf
  • ltx
  • lua
  • lvl
  • m
  • m2
  • m3u
  • m4a
  • m4v
  • map
  • max
  • mcmeta
  • mdb
  • mdbackup
  • mdc
  • mddata
  • mdf
  • mef
  • menu
  • mfw
  • mlx
  • mmw
  • moneywell
  • mos
  • mov
  • mp3
  • mp4
  • mpg
  • mpqge
  • mrw
  • mrwref
  • msg
  • myd
  • ncf
  • nd
  • ndd
  • nef
  • nk2
  • nop
  • nrw
  • ns2
  • ns3
  • ns4
  • nsd
  • nsf
  • nsg
  • nsh
  • ntl
  • nwb
  • nx1
  • nx2
  • nyf
  • oab
  • obj
  • odb
  • odc
  • odf
  • odg
  • odm
  • odp
  • ods
  • odt
  • orf
  • ost
  • otg
  • oth
  • otp
  • ots
  • ott
  • p12
  • p7b
  • p7c
  • pab
  • pak
  • pas
  • pat
  • pcd
  • pct
  • pdb
  • pdd
  • pdf
  • pef
  • pem
  • pfx
  • php
  • pkpass
  • pl
  • png
  • pot
  • potm
  • potx
  • ppam
  • pps
  • ppsm
  • ppsx
  • ppt
  • pptm
  • pptx
  • prf
  • ps
  • psafe3
  • psd
  • psk
  • pst
  • ptx
  • py
  • qba
  • qbb
  • qbm
  • qbr
  • qbw
  • qbx
  • qby
  • qdf
  • qic
  • r3d
  • ra2
  • raf
  • rar
  • raw
  • rb
  • rdb
  • re4
  • rgss3a
  • rim
  • rm
  • rofl
  • rtf
  • rw2
  • rwl
  • rwz
  • s3db
  • sas7bdat
  • sav
  • sb
  • sd0
  • sd1
  • sda
  • sdf
  • sid
  • sidd
  • sidn
  • sie
  • sis
  • sldm
  • sldx
  • slm
  • snx
  • sql
  • sqlite
  • sqlite3
  • sqlitedb
  • sr2
  • srf
  • srt
  • srw
  • st4
  • st5
  • st6
  • st7
  • st8
  • stc
  • std
  • sti
  • stw
  • stx
  • sum
  • svg
  • swf
  • sxc
  • sxd
  • sxg
  • sxi
  • sxm
  • sxw
  • syncdb
  • t12
  • t13
  • tax
  • tex
  • tga
  • thm
  • tlg
  • tor
  • txt
  • upk
  • vcf
  • vdf
  • vfs0
  • vob
  • vpk
  • vpp_pc
  • vtf
  • w3x
  • wallet
  • wav
  • wb2
  • wma
  • wmo
  • wmv
  • wotreplay
  • wpd
  • wps
  • x3f
  • xf
  • xla
  • xlam
  • xlk
  • xll
  • xlm
  • xlr
  • xls
  • xlsb
  • xlsm
  • xlsx
  • xlt
  • xltm
  • xltx
  • xlw
  • xml
  • xxx
  • ycbcra
  • yuv
  • zip
  • ztmp
  • arj
  • tib
  • wim
  • aep
  • tar
  • jar
  • bmp
  • swm
  • vault
  • xtbl
  • ctb
  • 113
  • 73b
  • a3d
  • abf
  • abk
  • prproj
  • torrent
  • bck
  • as4
  • asvx
  • ate
  • old
  • unity3d
  • gif
  • html
  • htm
  • shtm
  • shtml
  • con
  • bin
  • pass
  • lng
  • ttarch2
  • mpq
  • cab
  • NetCDF
  • DayZProfile
  • 001
  • DTAUS
  • DICOM
  • CCD
  • mcgame
  • OFX
  • QBO
  • QFX
  • QIF
  • emlx
  • EDI
  • DTA
  • data
  • epub
  • sc2save
  • spf
  • sv$
  • SDXF
  • XMI
  • dwfx
  • dgb
  • dc3
  • wbb
  • win
  • vbox-prev
  • trn
  • bcm
  • bb
  • bakx
  • bak3
  • bak2
  • ati
  • keystore
  • asd
  • MPEG-2
  • pub
  • WIF
  • SUB
  • IMG
  • MDS
  • GPX
  • IFF
  • CLEAR
  • MPEG-4
  • DivX
  • MPEG-1
  • mpg
  • vob
  • fb2
  • pdb
  • mobi
  • azw
  • azw4
  • qt
  • gzip
  • ldf
  • sldprt
  • cpt
  • m2v
  • mkv
  • mpeg
  • sbs
  • dat
  • dt
  • nbd
  • sldasm
  • rx2
  • pz3
  • tbl
  • tis
  • sna
  • sn1
  • gbk
  • iv2i
  • m3d
  • fbf
  • fbk
  • fbw
  • fbx
  • cf
  • bac
  • xlsk
  • pwm
  • wab
  • 1cd
  • wdb
  • bz2
  • gz
  • b1
  • xpi
  • bzip2
  • tbz2
  • tbz
  • txz
  • chm
  • chi
  • chq
  • chw
  • hxs
  • hxi
  • hxr
  • hxq
  • hxw
  • lit
  • cpio
  • deb
  • tgz
  • tpz
  • hfs
  • lzh
  • lha
  • lzma
  • rpm
  • xar
  • z
  • taz
  • xz
  • dmg
  • cb7
  • cbr
  • cbt
  • cbz
  • wbcat
  • mts
  • pgp
  • gpg
  • qvw
  • sln
  • suo
  • lic
  • rpt
  • gros
  • model
  • ark

NOTES:

This ransomware displays the following window containing the ransom message:

The dropped ransom note contains the same ransom message:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.242.05

FIRST VSAPI PATTERN DATE:

30 Dec 2015

VSAPI OPR PATTERN File:

12.243.00

VSAPI OPR PATTERN Date:

31 Dec 2015

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_CRYPFIRAGO.A

[ Learn More ]
  1. 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.
  2. 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.
  3. 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 this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • FILESAREGONE.TXT
  • HAVEYOURSECRET.KEY

Step 5

Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYPFIRAGO.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 6

Restore encrypted files from backup.


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