Analysis by: Bren Matthew Ebriega
ALIASES:

HEUR:Trojan-Banker.Win32.Danabot.gen (KASPERSKY); W32/Danabot.R!tr (FORTINET)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

As of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 912,896 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 22 Jul 2019
Payload: Connects to URLs/IPs

Arrival Details

This Trojan Spy 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 Spy drops the following files:

  • {malware folder}\{malware name}.dll

It adds the following processes:

  • %System%\regsvr32.exe -s {malware folder}\{malware name}.dll f1 {malware folder}\{malware name}.EXE
  • %System%\rundll32.exe {malware folder}\{malware name}.dll,f0

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %Program Data%\{Random Characters}
  • %Program Data%\{Random Characters}\{Random Characters}
  • %Program Data%\{Random Characters}\{Random Characters}

Download Routine

This Trojan Spy connects to the following URL(s) to download its component file(s):

  • {BLOCKED}.{BLOCKED}.192.171:443
  • {BLOCKED}.{BLOCKED}.51.167:443
  • {BLOCKED}.{BLOCKED}.225.188:443
  • {BLOCKED}.{BLOCKED}.180.182:443
  • {BLOCKED}.{BLOCKED}.171.166:443
  • {BLOCKED}.{BLOCKED}.218.17:443
  • {BLOCKED}.{BLOCKED}.110.193:443
  • {BLOCKED}.{BLOCKED}.117.171:443
  • {BLOCKED}.{BLOCKED}.85.184:443
  • {BLOCKED}.{BLOCKED}.51.211:443

As of this writing, the said sites are inaccessible.

Other Details

This Trojan Spy deletes the initially executed copy of itself.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.708.03
FIRST VSAPI PATTERN DATE: 22 Jul 2019
VSAPI OPR PATTERN File: 15.709.00
VSAPI OPR PATTERN Date: 23 Jul 2019

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • TROJ.Win32.TRX.XXPE50FLM009

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete these folders

[ 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.  
  • %Program Data%\{Random Characters}
  • %Program Data%\{Random Characters}\{Random Characters}
  • %Program Data%\{Random Characters}\{Random Characters}

Step 6

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.
  • {malware folder}\{malware name}.dll

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.DANABOT.THGBBAI. 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.


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