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RANSOM_JUSINOMEL.A

November 17, 2016
 ALIASES:

Ransom:Win32/CryptoLemPiz.A (Microsoft), Win32:Ransom-AYY [Trj] (Avast)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

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 connects to certain websites to send and receive information. It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

110,714 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Jul 2016

Payload:

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

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.

Installation

This Trojan drops the following files:

  • {malware path}\PLJQKRKMWEZJEHEVT.txt - Serves as ransom note
  • {folders containing encrypted files}\README NOW !!!.txt - Serves as ransom note

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • WrXehWMqEUv9ObHQ

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
WrXehWMqEUv9ObHQ = "{malware path}\{malware filename}.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\WrXehWMqEUv9ObHQ

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\WrXehWMqEUv9ObHQ
WrXehWMqEUv9ObHQu = "Ee-{random characters)"

HKEY_LOCAL_MACHINE\SOFTWARE\WrXehWMqEUv9ObHQ
WrXehWMqEUv9ObHQp = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\WrXehWMqEUv9ObHQ
WrXehWMqEUv9ObHQs = "1"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\VSS\Diag\
SPP
SppEnumGroups (Enter) = {hex values}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\VSS\Diag\
SPP
SppEnumGroups (Leave) = {hex values}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\VSS\Diag\
SPP
SppGetSnapshots (Enter) = {hex values}

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\VSS\Diag\
SP
SppGetSnapshots (Leave) = {hex values}

Other Details

This Trojan connects to the following website to send and receive information:

  • http://{BLOCKED}veforyou.com/456/index.php

It renames encrypted files using the following names:

  • {filename of encrypted file}.{extension of encrypted file}.id-{unique ID per victim}_sos@juicylemon.biz

It deletes itself after execution.

NOTES:

This ransomware encrypts files in the affected system.

It avoids encrypting files in folders and subfolders with names that start with any of the following strings:

  • windows
  • program

It avoids encrypting the following files:

  • boot.ini
  • NTDETECT.COM
  • Bootfont.bin
  • ntldr
  • bootmgr
  • BOOTNXT
  • BOOTSECT.BAK
  • NTUSER.DAT
  • PDOXUSRS.NET

It avoids encrypting files with the following extensions:

  • .acm
  • .ade
  • .adp
  • .app
  • .asa
  • .asp
  • .aspx
  • .ax
  • .bas
  • .bat
  • .bin
  • .biz
  • .bootmgr
  • .chm
  • .clb
  • .cmd
  • .cnt
  • .cnv
  • .com
  • .cpl
  • .cpx
  • .crt
  • .csh
  • .dll
  • .drv
  • .dtd
  • .exe
  • .fxp
  • .grp
  • .h1s
  • .hlp
  • .hta
  • .ini
  • .ime
  • .inf
  • .ins
  • .isp
  • .its
  • .js
  • .jse
  • .ksh
  • .lnk
  • .mad
  • .maf
  • .mag
  • .mam
  • .man
  • .maq
  • .mar
  • .mas
  • .mat
  • .mau
  • .mav
  • .maw
  • .mda
  • .mdb
  • .mde
  • .mdt
  • .mdw
  • .mdz
  • .msc
  • .msi
  • .msp
  • .mst
  • .mui
  • .nls
  • .ntldr
  • .ocx
  • .ops
  • .pal
  • .pcd
  • .pif
  • .prf
  • .prg
  • .pst
  • .reg
  • .scf
  • .scr
  • .sca
  • .sys

It terminates itself if it is found running in the Virtual Box.

It deletes shadow copies.

It displays the following ransom note:

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.664.03

FIRST VSAPI PATTERN DATE:

20 Jul 2016

VSAPI OPR PATTERN File:

12.665.00

VSAPI OPR PATTERN Date:

21 Jul 2016

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.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • WrXehWMqEUv9ObHQ

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
    • WrXehWMqEUv9ObHQ = "{malware path}\{malware filename}.exe"

Step 5

Search and delete these files

[ 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.
  • {malware path}\PLJQKRKMWEZJEHEVT.txt
  • {folders containing encrypted files}\README NOW !!!.txt

Step 6

Scan your computer with your Trend Micro product to delete files detected as RANSOM_JUSINOMEL.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 7

Restore encrypted files from backup.


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