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RANSOM_MABORO.A

January 18, 2017
 Analysis by: Julie Anne Cabuhat
 ALIASES:

Ransom.Marlboro (Malwarebytes), W32/Filecoder_Marlboro.A!tr (Fortinet)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

693,760 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Jan 2017

Payload:

Connects to URLs/IPs, Encrypts files, Displays message/message boxes

Installation

This Trojan drops the following files:

  • {folder of encrypted files}\_HELP_Recover_Files_.html - ransom note
  • %User Profile%\SoftwareInfo.dat

(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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}t.{BLOCKED}b.com/

It encrypts files with the following extensions:

  • .mid
  • .wma
  • .flv
  • .mkv
  • .mov
  • .avi
  • .asf
  • .mpeg
  • .vob
  • .mpg
  • .wmv
  • .fla
  • .swf
  • .wav
  • .mp3
  • .qcow2
  • .vdi
  • .vmdk
  • .vmx
  • .gpg
  • .aes
  • .ARC
  • .PAQ
  • .tar
  • .bz2
  • .tbk
  • .bak
  • .tar
  • .tgz
  • .rar
  • .zip
  • .djv
  • .djvu
  • .svg
  • .bmp
  • .png
  • .gif
  • .raw
  • .cgm
  • .jpeg
  • .jpg
  • .tif
  • .tiff
  • .NEF
  • .psd
  • .cmd
  • .bat
  • .class
  • .jar
  • .java
  • .asp
  • .aspx
  • .brd
  • .sch
  • .dch
  • .dip
  • .vbs
  • .asm
  • .pas
  • .cpp
  • .php
  • .ldf
  • .mdf
  • .ibd
  • .MYI
  • .MYD
  • .frm
  • .odb
  • .dbf
  • .mdb
  • .sql
  • .SQLITEDB
  • .SQLITE3
  • .asc
  • .lay6
  • .lay
  • .ms11
  • .sldm
  • .sldx
  • .ppsm
  • .ppsx
  • .ppam
  • .docb
  • .mml
  • .sxm
  • .otg
  • .odg
  • .uop
  • .potx
  • .potm
  • .pptx
  • .pptm
  • .std
  • .sxd
  • .pot
  • .pps
  • .sti
  • .sxi
  • .otp
  • .odp
  • .wks
  • .xltx
  • .xltm
  • .xlsx
  • .xlsm
  • .xlsb
  • .slk
  • .xlw
  • .xlt
  • .xlm
  • .xlc
  • .dif
  • .stc
  • .sxc
  • .ots
  • .ods
  • .hwp
  • .dotm
  • .dotx
  • .docm
  • .docx
  • .DOT
  • .max
  • .xml
  • .txt
  • .CSV
  • .uot
  • .RTF
  • .pdf
  • .XLS
  • .PPT
  • .stw
  • .sxw
  • .ott
  • .odt
  • .DOC
  • .pem
  • .csr
  • .crt
  • .key
  • .dat

It renames encrypted files using the following names:

  • {file name}.{file extension}.oops

It does the following:

  • It deletes all shadow copies by executing the following command:
    • /C vssadmin.exe Delete Shadows /All /Quiet
  • It drops the following ransom notes:


However, as of this writing, the said sites are inaccessible.

NOTES:

This ransomware encrypts files in the following locations:

  • %Desktop%
  • %User Profile%\Documents
  • C:\Documents and Settings\All Users\Documents\My Music - Windows XP and older
  • C:\Documents and Settings\All Users\Documents\My Pictures - Windows XP and older
  • C:\Users\Public\Music - Windows 7 and later
  • C:\Users\Public\Pictures - Windows 7 and later
  • {Fixed Hard Disk Drives}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

13.152.05

FIRST VSAPI PATTERN DATE:

12 Jan 2017

VSAPI OPR PATTERN File:

13.153.00

VSAPI OPR PATTERN Date:

13 Jan 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

Restart in Safe Mode

[ Learn More ]

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.  
  • %User Profile%\SoftwareInfo.dat
  • {folder of encrypted files}\_HELP_Recover_Files_.html

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_MABORO.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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