Analysis by: Noel Anthony Llimos
ALIASES:

HEUR:Trojan.Win32.Generic (Kaspersky), Generic.Ransom.Wannapeace.ADB62E51 (BitDefender), Ransom-RsSIRIA!48C8A7B12F28 (NAI)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

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 connects to certain websites to send and receive information.

It encrypts files with specific file extensions. It encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size: 1,600,000 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 20 Apr 2018
Payload: Encrypts files, , Connects to URLs/IPs

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 drops the following files:

  • {Current Directory of Malware}\RansSIRIA.exe
  • {Current Directory of Malware}\RsSIRIA.exe.Config

Other System Modifications

This Ransomware modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = {Malware File Name}.exe

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\DOMStorage\horacerta.com.br
(Default) = 24

Other Details

This Ransomware connects to the following URL(s) to get the affected system's IP address:

  • www.{BLOCKED}ool.com

It connects to the following website to send and receive information:

  • http://{BLOCKED}707.{BLOCKED}/

It connects to the following time servers to determine the current date:

  • http://www.{BLOCKED}rta.com.br/

It does the following:

  • It displays the following fake Word loading screen upon execution:
  • It does not proceed to its encryption routine if the current system is not located in Brazil
  • It connects to the following website upon successful encryption:
    • https://{BLOCKED}/qNxDFP

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .123
  • .3dm
  • .3ds
  • .3g2
  • .3gp
  • .602
  • .7z
  • .ARC
  • .PAQ
  • .accdb
  • .ai
  • .asc
  • .asf
  • .asm
  • .asp
  • .avi
  • .backup
  • .bak
  • .bat
  • .bmp
  • .brd
  • .bz2
  • .c
  • .cgm
  • .class
  • .cmd
  • .cpp
  • .crt
  • .cs
  • .csr
  • .csv
  • .db
  • .db2
  • .db3
  • .dbc
  • .dbf
  • .dch
  • .der
  • .dif
  • .dip
  • .djvu
  • .doc
  • .docb
  • .docm
  • .docx
  • .dot
  • .dotm
  • .dotx
  • .dwg
  • .edb
  • .eml
  • .fla
  • .flv
  • .frm
  • .gdb
  • .gif
  • .gpg
  • .gz
  • .h
  • .hwp
  • .ib
  • .ibd
  • .itdb
  • .jar
  • .java
  • .jpeg
  • .jpg
  • .js
  • .jsp
  • .key
  • .lay
  • .lay6
  • .ldf
  • .lnk
  • .m3u
  • .m4u
  • .max
  • .mdb
  • .mdf
  • .mht
  • .mid
  • .mkv
  • .mml
  • .mov
  • .mp3
  • .mp4
  • .mpeg
  • .mpg
  • .msg
  • .myd
  • .myi
  • .ndf
  • .nef
  • .odb
  • .odg
  • .odp
  • .ods
  • .odt
  • .onetoc2
  • .ost
  • .otg
  • .otp
  • .ots
  • .ott
  • .p12
  • .pas
  • .pdf
  • .pem
  • .pfx
  • .php
  • .pl
  • .png
  • .pot
  • .potm
  • .potx
  • .ppam
  • .pps
  • .ppsm
  • .ppsx
  • .ppt
  • .pptm
  • .pptx
  • .ps1
  • .psd
  • .pst
  • .py
  • .rar
  • .raw
  • .rb
  • .rtf
  • .sch
  • .scx
  • .sdf
  • .sh
  • .sldm
  • .sldx
  • .slk
  • .sln
  • .snt
  • .sql
  • .sqlite
  • .sqlite3
  • .sqlitedb
  • .stc
  • .std
  • .sti
  • .stw
  • .suo
  • .svg
  • .swf
  • .sxc
  • .sxd
  • .sxi
  • .sxm
  • .sxw
  • .tar
  • .tbk
  • .tgz
  • .tif
  • .tiff
  • .txt
  • .uop
  • .uot
  • .vb
  • .vcd
  • .vdi
  • .vmdk
  • .vmx
  • .vob
  • .vsd
  • .vsdx
  • .wav
  • .wb2
  • .wdb
  • .wk1
  • .wks
  • .wma
  • .wmv
  • .xlc
  • .xld
  • .xlm
  • .xls
  • .xlsb
  • .xlsm
  • .xlsx
  • .xlt
  • .xltm
  • .xltx
  • .xlw
  • .zip

It encrypts files found in the following folders:

  • %Windows%
  • %Program Files%
  • %ProgramData%

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in 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.)

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.202.04
FIRST VSAPI PATTERN DATE: 19 Apr 2018
VSAPI OPR PATTERN File: 14.203.00
VSAPI OPR PATTERN Date: 20 Apr 2018

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

[ Learn More ]

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\DirectDraw\MostRecentApplication
    • Name = {Malware File Name}.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\DOMStorage\horacerta.com.br
    • (Default) = 24

Step 4

Identify and terminate files detected as RANSOM_WANNAPEACE.THDBOAH

[ 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 5

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.
  • {Current Directory of Malware}\RansSIRIA.exe
  • {Current Directory of Malware}\RsSIRIA.exe.Config

Step 6

Scan your computer with your Trend Micro product to delete files detected as RANSOM_WANNAPEACE.THDBOAH. 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:


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