Analysis by: Oliver Ramirez
 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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 encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size: 2,063,360 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 23 Jul 2017
Payload: Displays graphics/image, Encrypts files

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:

  • %Desktop%\Notify.jpg

Other System Modifications

This Ransomware adds the following registry keys:

HKEY_CURRENT_USER\Software\Rs
ID = {number}

HKEY_CURRENT_USER\Software\Rs
IsEncrypt = {hex values}

It changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = 10

HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = 0

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%Desktop%\Notify.jpg"

Other Details

This Ransomware encrypts files with the following extensions:

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

It checks for the presence of the following process(es):

  • VBoxTray.exe
  • VBoxService.exe
  • kvm.exe
  • vmtoolsd.exe
  • vmwareuser.exe
  • vmwaretray.exe

Ransomware Routine

This Ransomware encrypts files found in the following folders:

  • %User Profile%\Documents
  • %Desktop%
  • {Drive Letter}:\

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop 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.)

It avoids encrypting files with the following strings in their file name:

  • bam!

It appends the following extension to the file name of the encrypted files:

  • bam!

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.552.03
FIRST VSAPI PATTERN DATE: 24 Jul 2017
VSAPI OPR PATTERN File: 13.553.00
VSAPI OPR PATTERN Date: 25 Jul 2017

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

Delete this registry key

[ 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.

 
  • HKEY_CURRENTUSER\Software\Rs

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.
  • %Desktop%\Notify.jpg

Step 5

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

Reset your Desktop properties

[ Learn More ]


Did this description help? Tell us how we did.