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Ransom_CERBER.BDN

April 06, 2017
 ALIASES:

Ransom:Win32/FileCryptor (Microsoft); RDN/Generic.grp (McAfee); Ransom.Rokku (Symantec); Trojan horse Atros5.KYW (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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 deletes itself after execution.

  TECHNICAL DETAILS

File Size:

310,272 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Apr 2017

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 copies of itself into the affected system:

  • %User Profile%\APPLIC~1\868aa263.exe

(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.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
*868aa263.exe = "%User Profile%\APPLIC~1\868aa263.exe"

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\APPLIC~1\868aa263.exe

(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.)

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\APPLIC~1\868aa263.exe.dat
  • %System Root%\documents and settings\all users\documents\my music\sample music\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\all users\documents\my pictures\sample pictures\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\cookies\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\local settings\history\history.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\local settings\temporary internet files\content.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\templates\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\localservice\local settings\application data\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\cookies\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\application data\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\history\history.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\history\history.ie5\mshist012013061320130614\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temp\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\09rwhjqn\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\bvlbnmkh\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\zdgznka5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\zsgkjko6\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\templates\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\idtemplates\enu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\javascripts\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\legal\enu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\plug_ins\annotations\stamps\enu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\plug_ins\annotations\stamps\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\services\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\tracker\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\linguistics\languagenames2\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\icu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\mappings\adobe\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\mappings\mac\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\mappings\win\!!!!!readme!!!!!.htm
  • %System Root%\program files\common files\microsoft shared\stationery\!!!!!readme!!!!!.htm

(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.. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

Other Details

This Trojan deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

Restart in Safe Mode

[ Learn More ]

Step 3

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • *868aa263.exe = "%User Profile%\APPLIC~1\868aa263.exe"

Step 4

Search and delete these components

[ Learn More ]
There may be some components 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%\APPLIC~1\868aa263.exe.dat
  • %System Root%\documents and settings\all users\documents\my music\sample music\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\all users\documents\my pictures\sample pictures\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\cookies\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\local settings\history\history.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\local settings\temporary internet files\content.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\default user\templates\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\localservice\local settings\application data\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\cookies\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\application data\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\history\history.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\history\history.ie5\mshist012013061320130614\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temp\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\09rwhjqn\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\bvlbnmkh\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\zdgznka5\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\local settings\temporary internet files\content.ie5\zsgkjko6\!!!!!readme!!!!!.htm
  • %System Root%\documents and settings\wilbert\templates\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\idtemplates\enu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\javascripts\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\legal\enu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\plug_ins\annotations\stamps\enu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\plug_ins\annotations\stamps\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\services\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\reader\tracker\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\linguistics\languagenames2\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\icu\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\mappings\adobe\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\mappings\mac\!!!!!readme!!!!!.htm
  • %System Root%\program files\adobe\reader 10.0\resource\typesupport\unicode\mappings\win\!!!!!readme!!!!!.htm
  • %System Root%\program files\common files\microsoft shared\stationery\!!!!!readme!!!!!.htm

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom_CERBER.BDN. 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 this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Profile%\APPLIC~1\868aa263.exe


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