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RANSOM_LERITH.C

January 17, 2017
 Analysis by: Julie Anne Cabuhat
 ALIASES:

Ransomer.LZB (AVG), Ransom.Hitl (Malwarebytes)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  TECHNICAL DETAILS

File Size:

84,992 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Sep 2016

Payload:

encrypts files, renames encrypted files, Drops files

Other System Modifications

This Trojan adds the following registry keys:

HKLM\SOFTWARE\Classes\
.exe

HKLM\SOFTWARE\Classes\
exe\shell\open\
command

HKLM\SOFTWARE\Classes\
.dll

HKLM\SOFTWARE\Classes\
dll\shell\open\
command

HKLM\SOFTWARE\Classes\
.mp3

HKLM\SOFTWARE\Classes\
mp3\shell\open\
command

HKLM\SOFTWARE\Classes\
.mp4

HKLM\SOFTWARE\Classes\
mp4\shell\open\
command

HKLM\SOFTWARE\Classes\
.reg

HKLM\SOFTWARE\Classes\
reg\shell\open\
command

HKLM\SOFTWARE\Classes\
.bat

HKLM\SOFTWARE\Classes\
bat\shell\open\
command

HKLM\SOFTWARE\Classes\
.vbs

HKLM\SOFTWARE\Classes\
VBS\shell\open\
command

HKLM\SOFTWARE\Classes\
.cmd

HKLM\SOFTWARE\Classes\
cmd\shell\open\
command

HKLM\SOFTWARE\Classes\
.png

HKLM\SOFTWARE\Classes\
png\shell\open\
command

HKLM\SOFTWARE\Classes\
.jpg

HKLM\SOFTWARE\Classes\
jpg\shell\open\
command

HKLM\SOFTWARE\Classes\
.jpeg

HKLM\SOFTWARE\Classes\
jpeg\shell\open\
command

HKLM\SOFTWARE\Classes\
.lnk

HKLM\SOFTWARE\Classes\
lnk\shell\open\
command

It adds the following registry entries:

HKLM\SOFTWARE\Classes\
exe\shell\open\
command
(Default) = {malware path}\{malware file name}.exe "%1"

HKLM\SOFTWARE\Classes\
dll\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
mp3\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
mp4\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
reg\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
bat\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
VBS\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
cmd\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
png\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
jpg\shell\open\
command
(Default) = {malware path}\{malware file name}.exe "%1"

HKLM\SOFTWARE\Classes\
jpeg\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
lnk\shell\open\
command
(Default) = {malware path}\{malware name}.exe "%1"

HKLM\SOFTWARE\Classes\
.exe
(Default) = exe

HKLM\SOFTWARE\Classes\
.dll
(Default) = dll

HKLM\SOFTWARE\Classes\
.mp3
(Default) = mp3

HKLM\SOFTWARE\Classes\
.mp4
(Default) = mp4

HKLM\SOFTWARE\Classes\
.reg
(Default) = reg

HKLM\SOFTWARE\Classes\
.bat
(Default) = bat

HKLM\SOFTWARE\Classes\
.vbs
(Default) = vbs

HKLM\SOFTWARE\Classes\
.cmd
(Default) = cmd

HKLM\SOFTWARE\Classes\
.png
(Default) = png

HKLM\SOFTWARE\Classes\
.jpg
(Default) = jpg

HKLM\SOFTWARE\Classes\
.jpeg
(Default) = jpeg

HKLM\SOFTWARE\Classes\
.lnk
(Default) = lnk

Other Details

This Trojan renames encrypted files using the following names:

  • %Desktop%\Hitler Ransomware_{Number of files encrypted}.CainXPii

(Note: %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.)

NOTES:

The ransomware encrypts all files located in %Desktop%.

When the ransomware encrypts all files, the following window containing the ransom note is displayed:

If the user clicks the "Unlock PC" button, it connects to the smtp client smtp.{BLOCKED}l.com It uses the following credentials:

  • Username: {BLOCKED}
  • Password: Vony12345

    The ransomware then sends out an e-mail with the following details:

  • To: {BLOCKED}
  • From: {BLOCKED}
  • Subject: Paysafecard Code
  • Body: Paysafecard code vom Verschl\x00fcsselten PC {Textbox content}

    If the user tries to close the window, it displays the following message box:

    •   SOLUTION

    Minimum Scan Engine:

    9.800

    FIRST VSAPI PATTERN FILE:

    12.812.04

    FIRST VSAPI PATTERN DATE:

    01 Oct 2016

    VSAPI OPR PATTERN File:

    12.813.00

    VSAPI OPR PATTERN Date:

    02 Oct 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

    Restart in Safe Mode

    [ Learn More ]

    Step 4

    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\Classes
      • .exe
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\exe\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .dll
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\dll\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .mp3
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\mp3\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .mp4
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\mp4\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .reg
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\reg\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .bat
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\bat\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • vbs
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\VBS\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .cmd
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\cmd\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .png
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\png\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .jpg
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\jpg\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .jpeg
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\jpeg\shell\open
      • command
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
      • .lnk
    • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\lnk\shell\open
      • command

    Step 5

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