Trojan.Win32.PANDASTEAL.THDABBA

 Analysis by: Karen Ivy Titiwa

 ALIASES:

Trojan.BAT.KillAV(IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan may arrive bundled with malware packages as a malware component. It 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.

  TECHNICAL DETAILS

File Size:

94,720 bytes

Memory Resident:

Yes

Initial Samples Received Date:

12 Apr 2021

Payload:

Connects to URLs/IPs, Modifies system registry

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It 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:

  • REG ADD HKEY_CURRENT_USER\Software\Classes\CLSID\{fIVyUCyCgmYerDKhxywzCYHpaydQNEHJFGMJlsvEUxVbJBYZdTsUZShIZHHQYTVJJZjgDNeeOnJQOdvxQbp00e52-a214-4aGfgWBQtvSqxOkOREyJyBKuXxCVZOBjjnsGfdicRWTGVQHmjYPtuuQkXOxZYqUvnYGCdbzhxPoRzVpxIvPgNZuuByZUC-8fba-4357bb0072ec} /f
  • REG ADD HKEY_CURRENT_USER\Software\Classes\CLSID\{fIVyUCyCgmYerDKhxywzCYHpaydQNEHJFGMJlsvEUxVbJBYZdTsUZShIZHHQYTVJJZjgDNeeOnJQOdvxQbp00e52-a214-4aGfgWBQtvSqxOkOREyJyBKuXxCVZOBjjnsGfdicRWTGVQHmjYPtuuQkXOxZYqUvnYGCdbzhxPoRzVpxIvPgNZuuByZUC-8fba-4357bb0072ec}\InProcServer32 /ve /t REG_SZ /d C:\IDontExist.dll /f
  • cMd.E"x"e 2ubishdata2/R = PowERsHELl -ExecutionPolicy Bypass -w 1 /e {command}
  • PowERsHELl -ExecutionPolicy Bypass -w 1 /e {command}

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{malware filename}.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\DyEqOdpm.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}.{BLOCKED}.213.108/po/tai1.exe

As of this writing, the said sites are inaccessible.

Other Details

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Classes\
CLSID\{fIVyUCyCgmYerDKhxywzCYHpaydQNEHJFGMJlsvEUxVbJBYZdTsUZShIZHHQYTVJJZjgDNeeOnJQOdvxQbp00e52-a214-4aGfgWBQtvSqxOkOREyJyBKuXxCVZOBjjnsGfdicRWTGVQHmjYPtuuQkXOxZYqUvnYGCdbzhxPoRzVpxIvPgNZuuByZUC-8fba-4357bb0072ec}
InProcServer32 = "C:\IDontExist.dll"

It does the following:

  • It uses dsadd command using the following parameters to make changes in the active directory:
    • dsadd uanxmqderqqsqQhUgbsodWdmikeGaKOULMmamrYJdLDYhjbsKmBsrHcleMjhBWPsaxUwqXukSYAUKKjCGLrAHdEBTffQSsG
    • cn={username}{added user count starting at 1}
    • cn=uanxmqderqqsqQhUgbsodWdmikeGaKOULMmamrYJdLDYhjbsKmBsrHcleMjhBWPsaxUwqXukSYAUKKjCGLrAHdEBTffQSsGs
    • dc={DcName}
    • dc=com -pwd {password}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.666.04

FIRST VSAPI PATTERN DATE:

19 Apr 2021

VSAPI OPR PATTERN File:

16.667.00

VSAPI OPR PATTERN Date:

20 Apr 2021

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

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.

HKEY_CURRENT_USER>Software>Classes>CLSID>{fIVyUCyCgmYerDKhxywzCYHpaydQNEHJFGMJlsvEUxVbJBYZdTsUZShIZHHQYTVJJZjgDNeeOnJQOdvxQbp00e52-a214-4aGfgWBQtvSqxOkOREyJyBKuXxCVZOBjjnsGfdicRWTGVQHmjYPtuuQkXOxZYqUvnYGCdbzhxPoRzVpxIvPgNZuuByZUC-8fba-4357bb0072ec}&&InProcServer32 = C:\IDontExist.dll ||

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_CURRENT_USER\Software\Classes\CLSID\{fIVyUCyCgmYerDKhxywzCYHpaydQNEHJFGMJlsvEUxVbJBYZdTsUZShIZHHQYTVJJZjgDNeeOnJQOdvxQbp00e52-a214-4aGfgWBQtvSqxOkOREyJyBKuXxCVZOBjjnsGfdicRWTGVQHmjYPtuuQkXOxZYqUvnYGCdbzhxPoRzVpxIvPgNZuuByZUC-8fba-4357bb0072ec}

Step 5

Search and delete these files

[ 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.
  • %User Temp%\DyEqOdpm.exe
  • %User Startup%\{malware filename}.exe

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.PANDASTEAL.THDABBA. 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 the following Trend Micro Support pages for more information:


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