Ransom.Win32.POTTIEQ.A


 ALIASES:

Trojan-Ransom.Win32.Aura.aam (KASPERSKY), Ransom:Win32/Pottieq.A (MICROSOFT)

 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 gathers information and reports it to its servers.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

1,961,984 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

31 Aug 2018

Payload:

Displays graphics/image, Connects to URLs/IPs, Steals information, 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:

  • %User Startup%\{GUID}.bmp

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

It drops the following copies of itself into the affected system:

  • %User Startup%\{GUID}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Autostart Technique

This Ransomware creates the following registry entries to enable automatic execution of dropped component at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{GUID} = "%User Startup%\{GUID}.exe"

Other System Modifications

This Ransomware adds the following registry keys:

HKEY_CURRENT_USER\Control Panel\Desktop
{Default} = "%User Startup%\{GUID}.bmp"

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

HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = "0"

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%User Startup%\{GUID}.bmp"

It sets the system's desktop wallpaper to the following image:

Stolen Information

This Ransomware sends the gathered information via HTTP POST to the following URL:

  • http://{BLOCKED}het64.ru/assets/flash/pass/

Other Details

This Ransomware gathers the following information and reports it to its servers:

  • ID
  • GUID
  • PC NAME

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • jpg
  • jpeg
  • doc
  • rtf
  • xls
  • zip
  • db3
  • rar
  • 7z3gp
  • cdr
  • raw
  • cpt
  • m2v
  • gzip
  • docx
  • pdf
  • odt
  • avi
  • mkv
  • ods
  • arj
  • cer
  • mdb
  • csv
  • mpeg
  • mov
  • ppt
  • f
  • nrw
  • nx1
  • nbd
  • old
  • odb
  • odc
  • sldprt
  • wps
  • sldasm
  • sbs
  • p12
  • rx2
  • rwl
  • r3d
  • wps
  • qic
  • odp
  • pz3
  • ptx
  • pst
  • txt
  • pptm
  • pef
  • ods
  • x3f
  • tbl
  • tis
  • srw
  • srf
  • sr2
  • spf
  • sna
  • sn1
  • gho
  • gbk
  • iv2i
  • keyste
  • ldf
  • m3d
  • max
  • fbf
  • fdb
  • fbk
  • fbw
  • fbx
  • bak
  • bkf
  • bck
  • cf
  • erf
  • as4
  • asm
  • asvx
  • ate
  • bac
  • 73b
  • a3d
  • abf
  • abk
  • accdb
  • 113
  • xlsm
  • xlsk
  • xlsb
  • dwg
  • tib
  • pwm
  • wab
  • key
  • dt
  • ppsx
  • pptx
  • xlsx
  • 1cd
  • dbf
  • mp3
  • prproj
  • aiiso
  • ots
  • emlx
  • svg
  • aep
  • pps
  • flv
  • ofx
  • wmv
  • vob
  • swf
  • accdt
  • xml
  • qif
  • mp4
  • qt
  • xlr
  • db
  • pdb
  • sql
  • dxf
  • ost
  • pab
  • msg

It avoids encrypting files found in the following folders:

  • windows
  • program files
  • program files (x86)
  • programdata
  • system volume information
  • temp

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

  • .id-{id}-johnycryptor@{BLOCKED}l.com

It drops the following file(s) as ransom note:

  • %User Startup%\{GUID}.bmp

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows XP, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.552.03

FIRST VSAPI PATTERN DATE:

08 Oct 2018

VSAPI OPR PATTERN File:

14.553.00

VSAPI OPR PATTERN Date:

09 Oct 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

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {GUID} = "%User Startup%\{GUID}.exe"
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • {Default} = "%User Startup%\{GUID}.bmp"

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.
  • %User Startup%\{GUID}.bmp
  • %User Startup%\{GUID}.exe

Step 6

Reset your Desktop properties

[ Learn More ]

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.POTTIEQ.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 8

Restore encrypted files from backup.


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