RANSOM_ROKKU.B
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Spammed via email
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
TECHNICAL DETAILS
1,559,552 bytes
EXE
No
23 Mar 2016
Encrypts files
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This Trojan drops the following files:
- {root drive}\README_HOW_TO_UNLOCK.TXT
- {root drive}\README_HOW_TO_UNLOCK.HTML
- {folders containing encrypted files}\README_HOW_TO_UNLOCK.TXT
- {folders containing encrypted files}\README_HOW_TO_UNLOCK.HTML
It leaves text files that serve as ransom notes containing the following:
- YOUR FILE HAS BEEN LOCKED
In order to unlock your files, follow the instructions bellow:
1. Download and install Tor Browser
2. After a successful installation, run Tor Browser and wait for its initialization.
3. Type in the address bar: http://zvnvp2rhe3ljwf2m.onion
4. Follow the instructions on the site.
Other System Modifications
This Trojan modifies the following file(s):
- change the encrypted file's extension to ".rokku"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
services\VSS
Start = "4"
(Note: The default value data of the said registry entry is "3".)
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = "1"
(Note: The default value data of the said registry entry is "0".)
File Infection
This Trojan avoids infecting folders containing the following strings:
- recycle bin
- system volume information
Process Termination
This Trojan terminates the following services if found on the affected system:
- vss
- swprv
- srservice
Other Details
This Trojan encrypts files with the following extensions:
- 001
- 1dc
- 3ds
- anim
- apk
- arch00
- ari
- art
- arw
- asc
- ase
- asef
- asp
- aspx
- asset
- avi
- bak
- bar
- bay
- bc6
- bc7
- bgeo
- big
- bik
- bkf
- bkp
- blob
- bmp
- bsa
- c4d
- cap
- cas
- catpart
- catproduct
- cdr
- cef
- cer
- cfr
- cgm
- cha
- chr
- cld
- clx
- cpp
- cr2
- crt
- crw
- cs
- css
- csv
- cxx
- d3dbsp
- das
- dat
- dat
- dayzprofile
- dazip
- db
- dbf
- dbfv
- dcr
- dcs
- der
- desc
- dib
- dlc
- dle
- dlv
- dlv3
- dlv4
- dmp
- dng
- doc
- docm
- docx
- drf
- dvi
- dvr
- dwf
- dwg
- dxf
- dxg
- eip
- emf
- emz
- epf
- epk
- eps
- eps2
- eps3
- epsf
- epsp
- erf
- esm
- fbx
- ff
- fff
- fh10
- fh11
- fh7
- fh8
- fh9
- fig
- fsh
- ft8
- fxg
- gdb
- ge2
- gho
- gz
- hip
- hipnc
- hkdb
- hkx
- hplg
- hpp
- hvpl
- hxx
- iam
- ibank
- icb
- icxs
- idea
- iff
- iiq
- indd
- ipt
- iros
- irs
- rw2
- rwl
- rwz
- sav
- sbx
- sc2save
- sdf
- shp
- sid
- sidn
- sie
- sis
- skl
- skp
- sldasm
- sldprt
- slm
- slx
- slxp
- snx
- soft
- sqlite
- sqlite3
- sr2
- srf
- srw
- step
- stl
- stp
- sum
- svg
- svgz
- swatch
- syncdb
- t12
- t13
- tar
- tax
- tex
- tga
- tif
- tiff
- tor
- txt
- unity3d
- uof
- uos
- upk
- vda
- vdf
- vfl
- vfs0
- vpk
- vpp_pc
- vst
- vtf
- w3x
- wallet
- wav
- wb2
- wdx
- wma
- wmo
- wmv
- wotreplay
- wpd
- wps
- x3f
- xf
- xl
- xlk
- xlsb
- xlsm
- xlsx
- xvc
- xvz
- xxx
- ycbcra
- yuv
- zdct
- zip
- ztmp
- flt
- flv
- fmod
- forge
- fos
- fpk
- itdb
- itl
- itm
- iwd
- iwi
- j2k
- java
- jpe
- jpeg
- jpf
- jpg
- jpx
- k25
- kdb
- kdc
- kf
- kys
- lbf
- lex
- litemod
- lrf
- ltx
- lvl
- m2
- m2t
- m2ts
- m3u
- m4a
- m4v
- ma
- map
- mat
- max
- mb
- mcfi
- mcfp
- mcgame
- mcmeta
- mdb
- mdbackup
- mdc
- mddata
- mdf
- mdl
- mdlp
- mef
- mel
- menu
- mkv
- mll
- mlx
- mn
- mos
- mp
- mp4
- mrw
- mrwref
- mts
- mu
- mxf
- nb
- ncf
- nef
- nrw
- ntl
- obm
- ocdc
- odb
- odc
- odm
- odp
- ods
- odt
- omeg
- orf
- ott
- p12
- p7b
- p7c
- pak
- pct
- pcx
- pdd
- pef
- pem
- pfx
- php
- php4
- php5
- pic
- picnc
- pkpass
- png
- ppd
- ppt
- pptm
- pptx
- prj
- prt
- prtl
- ps
- psb
- psd
- psf
- psid
- psq
- pst
- ptl
- ptx
- pwl
- pxn
- pxr
- py
- qdf
- qic
- r3d
- raa
- raf
- rar
- raw
- rb
- re4
- rgss3a
- rim
- rofl
- rtf
- rtg
- rvt
NOTES:
This ransomware executes the following command to delete shadow copies:
wmic.exe shadowcopy delete /nointeractive
vssadmin.exe delete shadows /all/quiet
SOLUTION
9.800
12.422.02
23 Mar 2016
12.423.00
24 Mar 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
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\SystemRestore
- DisableSR = "1"
- DisableSR = "1"
Step 4
Search and delete this file
*Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).
• For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012:
- Open a Windows Explorer window.
- For Windows Vista, 7, and Server 2008 users, click Start>Computer.
- For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen, then click File Explorer.
- In the Search Computer/This PC input box, type:
DATA_GENERIC - Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 5
Scan your computer with your Trend Micro product to delete files detected as
*Note: 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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