RANSOM_JIGSAW.H
a variant of MSIL/Filecoder.Jigsaw.B (ESET)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This JIGSAW ransomware uses chat support to aid customers in paying the demanded ransom. Previous variants of JIGSAW are known to use scary or porn-related ransom messages.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
![](https://documents.trendmicro.com/images/ransom_jigsaw_h_bd.jpg)
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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
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.
It may be downloaded from the following remote sites:
- http://a.{BLOCKED}f.cat/sqbclc.exe
Installation
This Trojan drops the following copies of itself into the affected system and executes them:
- %Application Data%\Phtsd\phtsd.exe
- %AppDataLocal%\Movgt\movgt.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It creates the following folders:
- %Application Data%\System32Work
- %Application Data%\Phtsd
- %AppDataLocal%\Movgt
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
movgt.exe = "%AppDataLocal%\Movgt\movgt.exe"
Other System Modifications
This Trojan modifies the following file(s):
- It encrypts files and appends the extension .payms
Other Details
This Trojan encrypts files with the following extensions:
- .jpg
- .jpeg
- .raw
- .gif
- .png
- .bmp
- .3dm
- .max
- .accdb
- .db
- .dbf
- .mdb
- .pdb
- .sql
- .dwg
- .dxf
- .c
- .cpp
- .cs
- .h
- .php
- .asp
- .rb
- .java
- .jar
- .class
- .py
- .js
- .aaf
- .aep
- .aepx
- .plb
- .prel
- .prproj
- .aet
- .ppj
- .psd
- .indd
- .indl
- .indt
- .indb
- .inx
- .idml
- .pmd
- .xqx
- .xqx
- .ai
- .eps
- .ps
- .svg
- .swf
- .fla
- .as3
- .as
- .txt
- .doc
- .dot
- .docx
- .docm
- .dotx
- .dotm
- .docb
- .rtf
- .wpd
- .wps
- .msg
- .xls
- .xlt
- .xlm
- .xlsx
- .xlsm
- .xltx
- .xltm
- .xlsb
- .xla
- .xlam
- .xll
- .xlw
- .ppt
- .pot
- .pps
- .pptx
- .pptm
- .potx
- .potm
- .ppam
- .ppsx
- .ppsm
- .sldx
- .sldm
- .wav
- .mp3
- .aif
- .iff
- .m3u
- .m4u
- .mid
- .mpa
- .wma
- .ra
- .avi
- .mov
- .mp4
- .3gp
- .mpeg
- .3g2
- .asf
- .asx
- .flv
- .mpg
- .wmv
- .vob
- .m3u8
- .dat
- .csv
- .efx
- .sdf
- .vcf
- .xml
- .ses
- .Qbw
- .QBB
- .QBM
- .QBI
- .QBR
- .Cnt
- .Des
- .v30
- .Qbo
- .Ini
- .Lgb
- .Qwc
- .Qbp
- .Aif
- .Qba
- .Tlg
- .Qbx
- .Qby
- .1pa
- .Qpd
- .Txt
- .Set
- .Iif
- .Nd
- .Rtp
- .Tlg
- .Wav
- .Qsm
- .Qss
- .Qst
- .Fx0
- .Fx1
- .Mx0
- .FPx
- .Fxr
- .Fim
- .ptb
- .Ai
- .Pfb
- .Cgn
- .Vsd
- .Cdr
- .Cmx
- .Cpt
- .Csl
- .Cur
- .Des
- .Dsf
- .Ds4
- .Drw
- .Dwg
- .Eps
- .Ps
- .Prn
- .Gif
- .Pcd
- .Pct
- .Pcx
- .Plt
- .Rif
- .Svg
- .Swf
- .Tga
- .Tiff
- .Psp
- .Ttf
- .Wpd
- .Wpg
- .Wi
- .Raw
- .Wmf
- .Txt
- .Cal
- .Cpx
- .Shw
- .Clk
- .Cdx
- .Cdt
- .Fpx
- .Fmv
- .Img
- .Gem
- .Xcf
- .Pic
- .Mac
- .Met
- .PP4
- .Pp5
- .Ppf
- .Xls
- .Xlsx
- .Xlsm
- .Ppt
- .Nap
- .Pat
- .Ps
- .Prn
- .Sct
- .Vsd
- .wk3
- .wk4
- .XPM
- .zip
- .rar
It deletes the initially executed copy of itself
NOTES:
This ransomware displays the following window after encryption and every system startup:
![](http://documents.trendmicro.com/images/RANSOM_JIGSAW_H1.jpg)
It asks the users to pay $150 USD in bitcoins to decrypt the files. A chat page for support is also given by this ransomware:
![](http://documents.trendmicro.com/images/RANSOM_JIGSAW_H2.jpg)
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
Restart in Safe Mode
Step 4
Delete this 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- movgt.exe = "%AppDataLocal%\Movgt\movgt.exe"
- movgt.exe = "%AppDataLocal%\Movgt\movgt.exe"
Step 5
Search and delete these folders
- %Application Data%\System32Work
- %Application Data%\Phtsd
- %AppDataLocal%\Movgt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_JIGSAW.H. 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 7
Restore encrypted files from backup.
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