Analysis by: Neljorn Nathaniel Aguas
ALIASES:

UDS:Backdoor.MSIL.Androm.gen (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

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: 480,768 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 11 Sep 2023
Payload: Drops files

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 folders:

  • %Application Data%\{6 Random Hex Values}

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

It drops the following files:

  • %Application Data%\{6 Random Hex Values}\{6 Random Hex Values}.lck → Used to lock resource
  • %Application Data%\Microsoft\Crypto\RSA\{SID}\{Combination of Machine GUID and a Random GUID} → Contains RSA Cryptographic Key

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

It adds the following processes:

  • %Windows%\Microsoft.NET\Framework\{Version Number}\RegSvcs.exe

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

Other Details

This Trojan does the following:

  • It moves and renames the following file:
    • Old Path: %Windows%\Microsoft.NET\Framework\{Version Number}\RegSvcs.exe
    • New Path: %Application Data%\{6 Random Hex Values}\{6 Random Hex Values}.exe
  • It sets the attributes of the following file into Hidden and System:
    • %Application Data%\{6 Random Hex Values}\{6 Random Hex Values}.exe
  • It sets the attributes of the following folder into Hidden:
    • %Application Data%\{6 Random Hex Values}

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