Cервис управления информационной безопасностью
Cервис управления информационной безопасностью
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MITRE ATT&CK - Technique Network Share Discovery
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MITRE ATT&CK
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Network Share Discovery
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SECURITM это SGRC система, ? автоматизирующая процессы в службах информационной безопасности. SECURITM помогает построить и управлять ИСПДн, КИИ, ГИС, СМИБ/СУИБ, банковскими системами защиты.
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Network Share Discovery

Adversaries may look for folders and drives shared on remote systems as a means of identifying sources of information to gather as a precursor for Collection and to identify potential systems of interest for Lateral Movement. Networks often contain shared network drives and folders that enable users to access file directories on various systems across a network. File sharing over a Windows network occurs over the SMB protocol. (Citation: Wikipedia Shared Resource) (Citation: TechNet Shared Folder) Net can be used to query a remote system for available shared drives using the net view \\\\remotesystem command. It can also be used to query shared drives on the local system using net share. For macOS, the sharing -l command lists all shared points used for smb services.

ID: T1135
Tactic(s): Discovery
Platforms: Linux, macOS, Windows
Permissions Required: User
Data Sources: Command: Command Execution, Process: OS API Execution, Process: Process Creation
Version: 3.1
Created: 14 Dec 2017
Last Modified: 13 Oct 2021

Procedure Examples
Name Description
Ramsay

Ramsay can scan for network drives which may contain documents for collection.(Citation: Eset Ramsay May 2020)(Citation: Antiy CERT Ramsay April 2020)

During C0015, the threat actors executed the PowerView ShareFinder module to identify open shares.(Citation: DFIR Conti Bazar Nov 2021)
Conti

Conti can enumerate remote open SMB network shares using NetShareEnum().(Citation: CarbonBlack Conti July 2020)(Citation: CrowdStrike Wizard Spider October 2020)
Tonto Team

Tonto Team has used tools such as NBTscan to enumerate network shares.(Citation: TrendMicro Tonto Team October 2020)
Pupy

Pupy can list local and remote shared drives and folders over SMB.(Citation: GitHub Pupy)
Bazar

Bazar can enumerate shared drives on the domain.(Citation: NCC Group Team9 June 2020)
Cuba

Cuba can discover shared resources using the NetShareEnum API call.(Citation: McAfee Cuba April 2021)

Kwampirs

Kwampirs collects a list of network shares with the command net share.(Citation: Symantec Orangeworm April 2018)
QakBot

QakBot can use net share to identify network shares for use in lateral movement.(Citation: Trend Micro Qakbot May 2020)(Citation: Kaspersky QakBot September 2021)
APT39

APT39 has used the post exploitation tool CrackMapExec to enumerate network shares.(Citation: BitDefender Chafer May 2020)
SILENTTRINITY

SILENTTRINITY can enumerate shares on a compromised host.(Citation: GitHub SILENTTRINITY Modules July 2019)
Diavol

Diavol has a `ENMDSKS` command to enumerates available network shares.(Citation: Fortinet Diavol July 2021)

DarkVishnya

DarkVishnya scanned the network for public shared folders.(Citation: Securelist DarkVishnya Dec 2018)
Net

The net view \\remotesystem and net share commands in Net can be used to find shared drives and directories on remote and local systems respectively.(Citation: Savill 1999)
APT32

APT32 used the net view command to show all shares available, including the administrative shares such as C$ and ADMIN$.(Citation: Cybereason Cobalt Kitty 2017)
FIVEHANDS

FIVEHANDS can enumerate network shares and mounted drives on a network.(Citation: NCC Group Fivehands June 2021)
APT41

APT41 used the net share command as part of network reconnaissance.(Citation: FireEye APT41 Aug 2019)(Citation: Group IB APT 41 June 2021)
PlugX

PlugX has a module to enumerate network shares.(Citation: CIRCL PlugX March 2013)
CrackMapExec

CrackMapExec can enumerate the shared folders and associated permissions for a targeted network.(Citation: CME Github September 2018)
BitPaymer

BitPaymer can search for network shares on the domain or workgroup using net view .(Citation: Crowdstrike Indrik November 2018)
Empire

Empire can find shared drives on the local system.(Citation: Github PowerShell Empire)
Chimera

Chimera has used net share and net view to identify network shares of interest.(Citation: NCC Group Chimera January 2021)
Bad Rabbit

Bad Rabbit enumerates open SMB shares on internal victim networks.(Citation: ESET Bad Rabbit)
Dragonfly 2.0

Dragonfly 2.0 identified and browsed file servers in the victim network, sometimes , viewing files pertaining to ICS or Supervisory Control and Data Acquisition (SCADA) systems.(Citation: US-CERT TA18-074A)(Citation: US-CERT APT Energy Oct 2017)
TrickBot

TrickBot module shareDll/mshareDll discovers network shares via the WNetOpenEnumA API.(Citation: ESET Trickbot Oct 2020)(Citation: Bitdefender Trickbot March 2020)

During Operation Wocao, threat actors discovered network disks mounted to the system using netstat.(Citation: FoxIT Wocao December 2019)
APT38

APT38 has enumerated network shares on a compromised host.(Citation: CISA AA20-239A BeagleBoyz August 2020)
WhisperGate

WhisperGate can enumerate connected remote logical drives.(Citation: Cisco Ukraine Wipers January 2022)
HELLOKITTY

HELLOKITTY has the ability to enumerate network resources.(Citation: FireEye FiveHands April 2021)
Clambling

Clambling has the ability to enumerate network shares.(Citation: Trend Micro DRBControl February 2020)
Cobalt Strike

Cobalt Strike can query shared drives on the local system.(Citation: Cobalt Strike TTPs Dec 2017)
Avaddon

Avaddon has enumerated shared folders and mapped volumes.(Citation: Arxiv Avaddon Feb 2021)
Flagpro

Flagpro has been used to execute `net view` to discover mapped network shares.(Citation: NTT Security Flagpro new December 2021)
Clop

Clop can enumerate network shares.(Citation: Mcafee Clop Aug 2019)
Babuk

Babuk has the ability to enumerate network shares.(Citation: Sogeti CERT ESEC Babuk March 2021)
Tropic Trooper

Tropic Trooper used netview to scan target systems for shared resources.(Citation: TrendMicro TropicTrooper 2015)
WastedLocker

WastedLocker can identify network adjacent and accessible drives.(Citation: Sentinel Labs WastedLocker July 2020)
Olympic Destroyer

Olympic Destroyer will attempt to enumerate mapped network shares to later attempt to wipe all files on those shares.(Citation: Talos Olympic Destroyer 2018)
Sowbug

Sowbug listed remote shared drives that were accessible from a victim.(Citation: Symantec Sowbug Nov 2017)
MURKYTOP

MURKYTOP has the capability to retrieve information about shares on remote hosts.(Citation: FireEye Periscope March 2018)
OSInfo

OSInfo discovers shares on the network(Citation: Symantec Buckeye)
Stuxnet

Stuxnet enumerates the directories of a network resource.(Citation: Symantec W.32 Stuxnet Dossier)
ShimRat

ShimRat can enumerate connected drives for infected host machines.(Citation: FOX-IT May 2016 Mofang)
Dragonfly

Dragonfly has identified and browsed file servers in the victim network, sometimes , viewing files pertaining to ICS or Supervisory Control and Data Acquisition (SCADA) systems.(Citation: US-CERT TA18-074A)
Operation Wocao

Operation Wocao has discovered network disks mounted to the system using netstat.(Citation: FoxIT Wocao December 2019)

During Operation CuckooBees, the threat actors used the `net share` command as part of their advanced reconnaissance.(Citation: Cybereason OperationCuckooBees May 2022)
APT1

APT1 listed connected network shares.(Citation: Mandiant APT1)
InvisiMole

InvisiMole can gather network share information.(Citation: ESET InvisiMole June 2018)
Zebrocy

Zebrocy identifies network drives when they are added to victim systems.(Citation: Securelist Sofacy Feb 2018)
Cobalt Strike

Cobalt Strike can query shared drives on the local system.(Citation: Cobalt Strike TTPs Dec 2017)
Wizard Spider

Wizard Spider has used the “net view” command to locate mapped network shares.(Citation: DHS/CISA Ransomware Targeting Healthcare October 2020)
Koadic

Koadic can scan local network for open SMB.(Citation: Github Koadic)
DEATHRANSOM

DEATHRANSOM has the ability to use loop operations to enumerate network resources.(Citation: FireEye FiveHands April 2021)
QuietSieve

QuietSieve can identify and search networked drives for specific file name extensions.(Citation: Microsoft Actinium February 2022)

Mitigations
Mitigation Description
Operating System Configuration

Make configuration changes related to the operating system or a common feature of the operating system that result in system hardening against techniques.
Network Share Discovery Mitigation

Identify unnecessary system utilities or potentially malicious software that may be used to acquire network share information, and audit and/or block them by using whitelisting (Citation: Beechey 2010) tools, like AppLocker, (Citation: Windows Commands JPCERT) (Citation: NSA MS AppLocker) or Software Restriction Policies (Citation: Corio 2008) where appropriate. (Citation: TechNet Applocker vs SRP)

Detection

System and network discovery techniques normally occur throughout an operation as an adversary learns the environment. Data and events should not be viewed in isolation, but as part of a chain of behavior that could lead to other activities, such as Lateral Movement, based on the information obtained. Normal, benign system and network events related to legitimate remote system discovery may be uncommon, depending on the environment and how they are used. Monitor processes and command-line arguments for actions that could be taken to gather system and network information. Remote access tools with built-in features may interact directly with the Windows API to gather information. Information may also be acquired through Windows system management tools such as Windows Management Instrumentation and PowerShell.

References

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  26. Tudorica, R., Maximciuc, A., Vatamanu, C. (2020, March 18). New TrickBot Module Bruteforces RDP Connections, Targets Select Telecommunication Services in US and Hong Kong. Retrieved March 15, 2021.
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  60. Sogeti. (2021, March). Babuk Ransomware. Retrieved August 11, 2021.
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