Analysis by: Arianne Grace Dela Cruz
ALIASES:

Trojan.Win32.Staser.cvfi (KASPERSKY); Gen:Variant.Ursu.723068 (BITDEFENDER)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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: 965,120 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 24 Jan 2020
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 drops the following copies of itself into the affected system:

  • %System%\{String Name}.exe - where String Name can be any of the following:
    • about
    • account
    • activities
    • administration
    • advertised
    • along
    • always
    • always
    • areas
    • around
    • attend
    • because
    • become
    • besides
    • both
    • capacity
    • ceremony
    • change
    • cloud
    • collecting
    • command
    • compromised
    • computer
    • constructive
    • consultants
    • cooperation
    • coverage
    • crime
    • crowded
    • cultural
    • culture
    • development
    • development
    • digital
    • disable
    • disaster
    • Dongpo
    • during
    • energy
    • ensure
    • escalated
    • even
    • Even
    • event
    • Falcon
    • Falcon
    • featuring
    • festivals
    • figure
    • financial
    • firewalls
    • First
    • first
    • former
    • forum
    • found
    • from
    • gotten
    • governments
    • historical
    • hotbed
    • imagine
    • improve
    • inadequate
    • information
    • innovation
    • installed
    • international
    • learn
    • legendary
    • line
    • machine
    • management
    • manager
    • may
    • Meanwhile
    • memorial
    • more
    • needtemporarily
    • neglect
    • notice
    • obvious
    • often
    • often
    • opening
    • opening
    • past
    • people
    • performances
    • poverty
    • pretty
    • prevention
    • product
    • products
    • programs
    • proper
    • provided
    • quality
    • quickly
    • realize
    • recently
    • recorded
    • related
    • residence
    • response
    • result
    • routes
    • running
    • sanitation
    • scenario
    • scientific
    • Sensor
    • sensor
    • services
    • silently
    • sites
    • skeptical
    • Slums
    • slums
    • special
    • strengthening
    • such
    • suffer
    • suggestions
    • sure
    • sustainable
    • technological
    • temple
    • there
    • those
    • thought
    • through
    • tintr
    • tools
    • tourist
    • transformation
    • turn
    • turned
    • turning
    • uninstall
    • uninstall
    • unwilling
    • visit
    • watch
    • when
    • which
    • your
    • yourself

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It drops the following files:

  • %System%\LogFiles\Sum\ksmv.exe - detected as TROJ_FRS.0NA103LN19
  • %System%\LogFiles\Sum\{random letters}con.exe - detected as Coinminer.Win64.MALXMR.SMDCZ
  • %System%\LogFiles\Sum\WinRing0x64.sys
  • %System%\LogFiles\Sum\{random letters}cone.exe - Coinminer file
  • %System%\wostmp\{random numbers} - copy of original malware

(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:

  • %System%\wostmp\

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Autostart Technique

This Trojan adds and runs the following services:

  • {random characters} - to execute %System%\{String Name}.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CLASSES_ROOT\SHTInfo
comment = {Hex Values}

HKEY_CURRENT_ROOT\SHTInfo
intranet = {Hex Values}

HKEY_CURRENT_ROOT\SHTInfo
notice = {Hex Values}

HKEY_CURRENT_ROOT\SHTInfo
peer = {Hex Values}

HKEY_CURRENT_ROOT\SHTInfo
staticpeer = {Malware Defined Values}

HKEY_CURRENT_ROOT\SHTInfo
tunnel = {Malware Defined Values}

HKEY_CURRENT_ROOT\SHTInfo
sha1 = {Malware Defined Values}

Other Details

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT
SHTinfo =

It does the following:

  • It sends UDP packets to any of the following IP addresses within the network range:
    • 1.{BLOCKED}.1 up to 1.{BLOCKED}.255
    • 103.{BLOCKED}.0 up to 103.{BLOCKED}.255
    • 103.{BLOCKED}.1 up to 103.{BLOCKED}.255
    • 103.{BLOCKED}.0 up to 103.{BLOCKED}.255
    • 104.{BLOCKED}.0 up to 104.{BLOCKED}.255
    • 104.{BLOCKED}.0 up to 104.{BLOCKED}.255
    • 107.{BLOCKED}.0 up to 107.{BLOCKED}.255
    • 108.{BLOCKED}.0 up to 108.{BLOCKED}.255
    • 108.{BLOCKED}.0 up to 108.{BLOCKED}.255
    • 108.{BLOCKED}.0 up to 108.{BLOCKED}.255
    • 109.{BLOCKED}.0 up to 109.{BLOCKED}.255
    • 110.{BLOCKED}.1 up to 110.{BLOCKED}.255
    • 110.{BLOCKED}.0 up to 110.{BLOCKED}.255
    • 110.{BLOCKED}.1 up to 110.{BLOCKED}.255
    • 111.{BLOCKED}.1 up to 111.{BLOCKED}.255
    • 112.{BLOCKED}.0 up to 112.{BLOCKED}.255
    • 113.{BLOCKED}.0 up to 113.{BLOCKED}.255
    • 113.{BLOCKED}.0 up to 113.{BLOCKED}.255
    • 113.{BLOCKED}.1 up to 113.{BLOCKED}.255
    • 113.{BLOCKED}.0 up to 113.{BLOCKED}.255
    • 113.{BLOCKED}.1 up to 113.{BLOCKED}.255
    • 114.{BLOCKED}.1 up to 114.{BLOCKED}.255
    • 115.{BLOCKED}.0 up to 115.{BLOCKED}.255
    • 115.{BLOCKED}.1 up to 115.{BLOCKED}.255
    • 115.{BLOCKED}.0 up to 115.{BLOCKED}.255
    • 115.{BLOCKED}.1 up to 115.{BLOCKED}.255
    • 116.{BLOCKED}.0 up to 116.{BLOCKED}.255
    • 116.{BLOCKED}.1 up to 116.{BLOCKED}.255
    • 117.{BLOCKED}.0 up to 117.{BLOCKED}.255
    • 117.{BLOCKED}.1 up to 117.{BLOCKED}.255
    • 117.{BLOCKED}.0 up to 117.{BLOCKED}.255
    • 117.{BLOCKED}.0 up to 117.{BLOCKED}.255
    • 117.{BLOCKED}.0 up to 117.{BLOCKED}.255
    • 117.{BLOCKED}.0 up to 117.{BLOCKED}.255
    • 118.{BLOCKED}.0 up to 118.{BLOCKED}.255
    • 120.{BLOCKED}.0 up to 120.{BLOCKED}.255
    • 120.{BLOCKED}.1 up to 120.{BLOCKED}.255
    • 121.{BLOCKED}.0 up to 121.{BLOCKED}.255
    • 121.{BLOCKED}.1 up to 121.{BLOCKED}.255
    • 122.{BLOCKED}.0 up to 122.{BLOCKED}.255
    • 122.{BLOCKED}.1 up to 122.{BLOCKED}.255
    • 122.{BLOCKED}.1 up to 122.{BLOCKED}.255
    • 122.{BLOCKED}.0 up to 122.{BLOCKED}.255
    • 123.{BLOCKED}.1 up to 123.{BLOCKED}.255
    • 123.{BLOCKED}.0 up to 123.{BLOCKED}.255
    • 124.{BLOCKED}.1 up to 124.{BLOCKED}.255
    • 124.{BLOCKED}.0 up to 124.{BLOCKED}.255
    • 128.{BLOCKED}.0 up to 128.{BLOCKED}.255
    • 14.{BLOCKED}.0 up to 14.{BLOCKED}.255
    • 142.{BLOCKED}.0 up to 142.{BLOCKED}.255
    • 149.{BLOCKED}.0 up to 149.{BLOCKED}.255
    • 149.{BLOCKED}.0 up to 149.{BLOCKED}.255
    • 153.{BLOCKED}.0 up to 153.{BLOCKED}.255
    • 159.{BLOCKED}.0 up to 159.{BLOCKED}.255
    • 163.{BLOCKED}.1 up to 163.{BLOCKED}.255
    • 168.{BLOCKED}.1 up to 168.{BLOCKED}.255
    • 171.{BLOCKED}.0 up to 171.{BLOCKED}.255
    • 172.{BLOCKED}.1 up to 172.{BLOCKED}.255
    • 177.{BLOCKED}.1 up to 177.{BLOCKED}.255
    • 177.{BLOCKED}.0 up to 177.{BLOCKED}.255
    • 180.{BLOCKED}.1 up to 180.{BLOCKED}.255
    • 180.{BLOCKED}.0 up to 180.{BLOCKED}.255
    • 180.{BLOCKED}.0 up to 180.{BLOCKED}.255
    • 182.{BLOCKED}.0 up to 182.{BLOCKED}.255
    • 182.{BLOCKED}.1 up to 182.{BLOCKED}.255
    • 182.{BLOCKED}.1 up to 182.{BLOCKED}.255
    • 182.{BLOCKED}.1 up to 182.{BLOCKED}.255
    • 182.{BLOCKED}.0 up to 172.{BLOCKED}.255
    • 182.{BLOCKED}.1 up to 182.{BLOCKED}.255
    • 182.{BLOCKED}.0 up to 182.{BLOCKED}.255
    • 182.{BLOCKED}.0 up to 182.{BLOCKED}.255
    • 183.{BLOCKED}.1 up to 183.{BLOCKED}.255
    • 183.{BLOCKED}.0 up to 183.{BLOCKED}.255
    • 183.{BLOCKED}.1 up to 183.{BLOCKED}.255
    • 183.{BLOCKED}.0 up to 183.{BLOCKED}.255
    • 183.{BLOCKED}.0 up to 183.{BLOCKED}.255
    • 184.{BLOCKED}.0 up to 184.{BLOCKED}.255
    • 188.{BLOCKED}.1 up to 188.{BLOCKED}.255
    • 190.{BLOCKED}.0 up to 190.{BLOCKED}.255
    • 196.{BLOCKED}.0 up to 196.{BLOCKED}.255
    • 197.{BLOCKED}.0 up to 197.{BLOCKED}.255
    • 197.{BLOCKED}.1 up to 197.{BLOCKED}.255
    • 197.{BLOCKED}.1 up to 197.{BLOCKED}.255
    • 197.{BLOCKED}.0 up to 197.{BLOCKED}.255
    • 197.{BLOCKED}.0 up to 197.{BLOCKED}.255
    • 2.{BLOCKED}.0 up to 2.{BLOCKED}.255
    • 202.{BLOCKED}.1 up to 202.{BLOCKED}.255
    • 202.{BLOCKED}.0 up to 202.{BLOCKED}.255
    • 202.{BLOCKED}.0 up to 202.{BLOCKED}.255
    • 202.{BLOCKED}.1 up to 202.{BLOCKED}.255
    • 202.{BLOCKED}.1 up to 202.{BLOCKED}.255
    • 202.{BLOCKED}.1 up to 202.{BLOCKED}.255
    • 203.{BLOCKED}.0 up to 203.{BLOCKED}.255
    • 203.{BLOCKED}.1 up to 203.{BLOCKED}.255
    • 203.{BLOCKED}.0 up to 203.{BLOCKED}.255
    • 206.{BLOCKED}.0 up to 206.{BLOCKED}.255
    • 218.{BLOCKED}.1 up to 218.{BLOCKED}.255
    • 219.{BLOCKED}.1 up to 219.{BLOCKED}.255
    • 220.{BLOCKED}.0 up to 220.{BLOCKED}.255
    • 27.{BLOCKED}.0 up to 27.{BLOCKED}.255
    • 27.{BLOCKED}.1 up to 27.{BLOCKED}.255
    • 27.{BLOCKED}.1 up to 27.{BLOCKED}.255
    • 36.{BLOCKED}.1 up to 36.{BLOCKED}.255
    • 36.{BLOCKED}.0 up to 36.{BLOCKED}.255
    • 36.{BLOCKED}.1 up to 36.{BLOCKED}.255
    • 36.{BLOCKED}.0 up to 36.{BLOCKED}.255
    • 36.{BLOCKED}.0 up to 36.{BLOCKED}.255
    • 37.{BLOCKED}.1 up to 37.{BLOCKED}.255
    • 41.{BLOCKED}.0 up to 41.{BLOCKED}.255
    • 41.{BLOCKED}.1 up to 41.{BLOCKED}.255
    • 42.{BLOCKED}.1 up to 42.{BLOCKED}.255
    • 43.{BLOCKED}.1 up to 43.{BLOCKED}.255
    • 43.{BLOCKED}.0 up to 43.{BLOCKED}.255
    • 45.{BLOCKED}.1 up to 45.{BLOCKED}.255
    • 45.{BLOCKED}.0 up to 45.{BLOCKED}.255
    • 46.{BLOCKED}.0 up to 46.{BLOCKED}.255
    • 46.{BLOCKED}.1 up to 46.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}0 up to 47.{BLOCKED}.255
    • 47.{BLOCKED}.0 up to 47.{BLOCKED}.255
    • 49.{BLOCKED}.1 up to 49.{BLOCKED}.255
    • 49.{BLOCKED}.1 up to 49.{BLOCKED}.255
    • 58.{BLOCKED}.0 up to 58.{BLOCKED}.255
    • 59.{BLOCKED}.0 up to 59.{BLOCKED}.255
    • 59.{BLOCKED}.1 up to 59.{BLOCKED}.255
    • 60.{BLOCKED}.0 up to 60.{BLOCKED}.255
    • 61.{BLOCKED}.0 up to 61.{BLOCKED}.255
    • 61.{BLOCKED}.0 up to 61.{BLOCKED}.255
    • 61.{BLOCKED}.1 up to 61.{BLOCKED}.255
    • 61.{BLOCKED}.0 up to 61.{BLOCKED}.255
    • 70.{BLOCKED}.1 up to 70.{BLOCKED}.255
    • 82.{BLOCKED}.0 up to 82.{BLOCKED}.255
    • 89.{BLOCKED}.0 up to 89.{BLOCKED}.255
    • 91.{BLOCKED}.0 up to 91.{BLOCKED}.255
    • 93.{BLOCKED}.0 up to 93.{BLOCKED}.255
    • 94.{BLOCKED}.0 up to 94.{BLOCKED}.255
    • 95.{BLOCKED}.0 up to 95.{BLOCKED}.255
    • 96.{BLOCKED}.0 up to 96.{BLOCKED}.255
    • 98.{BLOCKED}.0 up to 98.{BLOCKED}.255
    • 99.{BLOCKED}.0 up to 99.{BLOCKED}.255
  • It uses the following uncommon ports:
    • 27930
    • 18931
  • It searches and gather data found in the following files:
    • C:\1f.txt
    • C:\1i.txt
    • C:\1p.txt
    • C:\Windows\1f.txt
    • C:\Windows\1i.txt
    • C:\Windows\1p.txt
    • D:\1f.txt
    • D:\1i.txt
    • D:\1p.txt
    • E:\1f.txt
    • E:\1i.txt
    • E:\1p.txt

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.692.07
FIRST VSAPI PATTERN DATE: 18 Feb 2020
VSAPI OPR PATTERN File: 15.693.00
VSAPI OPR PATTERN Date: 19 Feb 2020

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.XXPE50FFF033

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

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

Disable this malware service

[ Learn More ]
  • {Random Values}

Step 6

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_CLASSES_ROOT
    • SHTInfo

Step 7

Search and delete this file

[ 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.
  • %System%\{String Name}.exe
  • %System%\LogFiles\Sum\ksmv.exe
  • %System%\LogFiles\Sum\{random letters}con.exe
  • %System%\LogFiles\Sum\WinRing0x64.sys
  • %System%\LogFiles\Sum\{random letters}cone.exe
  • %System%\wostmp\{random numbers}

Step 8

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. %System%\wostmp\

Step 9

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win64.VICERCON.B. 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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