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Trojan.BAT.GANDCRAB.THCBIAI

April 01, 2019
 Analysis by: Jemimah Mae Molina
 ALIASES:

Trojan.PowerShell.Agent (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, 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.

  TECHNICAL DETAILS

File Size:

1,251 bytes

File Type:

BAT

Memory Resident:

No

Initial Samples Received Date:

25 Mar 2019

Payload:

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 adds the following processes:

  • cmd /c START C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe -nop -w hidden -e {base64 encoded command}

Other Details

This Trojan does the following:

  • It connects to https://{BLOCKED}in.com/raw/m2fPL2zH to reflectively load a malicious DLL binary detected as Ransom.Win32.GANDCRAB.THCBIAI to memory.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.904.02

FIRST VSAPI PATTERN DATE:

29 Mar 2019

VSAPI OPR PATTERN File:

14.905.00

VSAPI OPR PATTERN Date:

30 Mar 2019

Step 1

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 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 normal mode and scan your computer with your Trend Micro product for files detected as Trojan.BAT.GANDCRAB.THCBIAI. 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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