Analysis by: Arianne Grace Dela Cruz
ALIASES:

HEUR:Trojan.Win32.Corrempa.gen (KASPERSKY); Trojan.Crypt (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: 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.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size: 53,760 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 13 Aug 2021
Payload: Connects to URLs/IPs, Displays graphics/image

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.

Information Theft

This Trojan Spy gathers the following information on the affected computer:

  • Computer Name
  • Local Time

It accepts the following parameters:

  • {Target directory}

Other Details

This Trojan Spy does the following:

  • It gathers files from the specified directory and sends it to any of the following servers:
    • {BLOCKED}.{BLOCKED}.147.102
    • {BLOCKED}.{BLOCKED}.11.72
    • {BLOCKED}.{BLOCKED}.160.200
    • {BLOCKED}.{BLOCKED}.235.234
    • {BLOCKED}.{BLOCKED}.62.35
  • It checks for the computer's language and terminates itself if any the following language is detected:
    • Armenian
    • Azerbaijani (Cyrillic)
    • Azerbaijani (Latin)
    • Belarusian
    • Georgian
    • Kazakh
    • Kyrgyz
    • Russian
    • Russian (Maldova)
    • Taijik (Cyrillic)
    • Turkmen
    • Ukrainian
    • Uzbek (Cyrillic)
    • Uzbek (Latin)
  • It avoids obtaining files with the following strings in their file name:
    • autorun.inf
    • bootsect.bak
    • iconcache.db
    • ntldr
    • ntuser.dat.log
    • Restore-My-Files.txt
    • thumbs.db
  • It avoids obtaining files from the following folders:
    • $recycle.bin
    • $windows.~bt
    • $windows.~ws
    • All users
    • appdata
    • application data
    • boot
    • common files
    • google
    • intel
    • Internet Explorer
    • Microsoft
    • microsoft shared
    • Microsoft.NET
    • mozilla
    • Msbuild
    • msocache
    • opera
    • perflogs
    • system volume information
    • tor browser
    • windows
    • Windows Journal
    • Windows nt
    • windows.old
  • It avoids obtaining files with the following file extensions:
    • .386
    • .adv
    • .ani
    • .bat
    • .bin
    • .cmd
    • .com
    • .cpl
    • .diagcab
    • .diagcfg
    • .diagpkg
    • .dll
    • .drv
    • .exe
    • .hlp
    • .hta
    • .icns
    • .ico
    • .ics
    • .idx
    • .ini
    • .key
    • .lnk
    • .lock
    • .lockbit
    • .mod
    • .mp3
    • .mpa
    • .msc
    • .msi
    • .msp
    • .msstyles
    • .msu
    • .nls
    • .ocx
    • .prf
    • .ps1
    • .rdp
    • .reg
    • .rom
    • .rtp
    • .shs
    • .spl
    • .sys
    • .theme
    • .wpx
  • It creates the following named pipe:
    • \??\pipe\STEALBIT-MASTER-PIPE
  • It displays the following upon execution:

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.902.04
FIRST VSAPI PATTERN DATE: 13 Aug 2021
VSAPI OPR PATTERN File: 16.903.00
VSAPI OPR PATTERN Date: 14 Aug 2021

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.XXPE50FFF046

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

Scan your computer with your Trend Micro product to delete files detected as TrojanSpy.Win32.STEALBIT.YXBHM. 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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