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Ransom_CERBER.JTB

June 12, 2017
 ALIASES:

Ransom:Win32/Cerber (Microsoft); RDN/Generic.grp (McAfee); Ransom.Cerber (Symantec); Trojan-Ransom.Win32.Zerber.edzm (Kaspersky); Mal/Cerber-U (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Ransom_r.CJS (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:

436,638 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Jun 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 creates the following folders:

  • %User Temp%\6abce574

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.)

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\tmp6.tmp

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\6abce574\42c5.tmp
  • %User Temp%\6abce574\4afc.tmp
  • %User Profile%\cookies\_R_E_A_D___T_H_I_S___92PGC_.hta
  • %User Profile%\cookies\_R_E_A_D___T_H_I_S___WO6V_.txt
  • %User Temp%\tmp6.bmp
  • %Desktop%\_R_E_A_D___T_H_I_S___69WO_.hta
  • %Desktop%\_R_E_A_D___T_H_I_S___WCJB3F0_.txt

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.. %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.. %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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}0.1
  • {BLOCKED}37.21
  • {BLOCKED}.149.172
  • {BLOCKED}.163.190

It 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

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 Temp%\6abce574\42c5.tmp
  • %User Temp%\6abce574\4afc.tmp
  • %User Profile%\cookies\_R_E_A_D___T_H_I_S___92PGC_.hta
  • %User Profile%\cookies\_R_E_A_D___T_H_I_S___WO6V_.txt
  • %User Temp%\tmp6.bmp
  • %Desktop%\_R_E_A_D___T_H_I_S___69WO_.hta
  • %Desktop%\_R_E_A_D___T_H_I_S___WCJB3F0_.txt

Step 3

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Temp%\6abce574

Step 4

Scan your computer with your Trend Micro product to delete files detected as Ransom_CERBER.JTB. 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 5

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 Temp%\tmp6.tmp


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