TrojanSpy.Win32.ICEDID.BP

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.

It executes then deletes itself afterward.

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:

• %User Temp%\Cab{random}.tmp
• %User Temp%\Tar{random}.tmp
• %AppDataLocal%\{GUID}\izsiac.png
• %Application Data%\{5-7 Random Characters}\{Random}.dll → modified copy

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

• %System%\msiexec.exe /i {Random 6 characters}.msi → injects malicious code

(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:

• %AppDataLocal%\{GUID}
• %Application Data%\{5-7 Random Characters}

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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 executes then deletes itself afterward.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• Global\{GUID}

Other System Modifications

This Trojan Spy deletes the following files:

• %User Temp%\Cab{random}.tmp
• %User Temp%\Tar{random}.tmp

(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).)

Backdoor Routine

This Trojan Spy connects to the following URL(s) to send and receive commands from a remote malicious user:

• https://{BLOCKED}osuede.club/audio/?z={Base64 Encoded Information}
  • When decoded, the sent information is in the following format:
    {String 1}{String 2}{String 3}
  • Where:
  • String 1 - Data that is present in all requests:
  • a={Downloader ID}&b={Bot ID}&c={ICEDID main module version}&d={The integer value that the main module obtains from the downloader}&e={Request type, 1: registration, 0: a regular request}&u={Time Stamp}
  • String 2 - Data that only has to be present on the first connection:
  • &j={Mac Address}&m={Computer Name}&p={Domain}&k={integer value}&n={An integer value that contains information about the launch on a virtual machine}&o={OS Information}&l={Username}&w={integer value obtained from SID}
  • String 3 - Optional data and only included when a value is found:
  • &q={Downloader Version}&r={Sys config checksum}&s={Main config checksum}&t={C&C list checksum}&h={The string value obtained from the downloader and marks as pgid}&i={The string value obtained from the downloader and marks as gid}&v={GetLastError vallue when opening the downloader file}

Download Routine

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

• {BLOCKED}osuede.club/image/?id={015AF478E393B679CC010000FC000340000010}
• {BLOCKED}ueded.top/image/?id={015AF478E393B679CC010000FC000340000010}

It saves the files it downloads using the following names:

• %AppDataLocal%\{Random}\izsiac.png

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

Information Theft

This Trojan Spy gathers the following data:

• Username
• Computer Name
• Domain
• OS Information
• MAC Address

Other Details

This Trojan Spy adds the following scheduled tasks:

• Task Name: {GUID}
  • Task Trigger: At every logon
  • Task Action: Start a program
  • Details:regsvr32.exe /s "%Application Data%\{5-7 Random Characters}\{Random}.dll"

(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).)