MalwareUsed by 1 actor

firewalld

For your environment

Hunt this family in your stack

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THREAT ACTORS

Groups observed using it

1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

View more details

UNC4540

The malware uses a bash script named firewalld that executes a SQL command to steal credentials and execute other components, including the TinyShell backdoor.

via register securitytheregister.com

MITRE ATT&CK

Techniques & procedures

5 distinct techniques documented for this family, organized by ATT&CK tactic.

Initial Access

1 technique

T1190Exploit Public-Facing ApplicationEvidence1

A suspected Chinese hacking campaign has been targeting unpatched SonicWall Secure Mobile Access (SMA) appliances... While it is unclear what vulnerability was used to compromise devices, Mandiant says that the targeted devices were unpatched, making them likely vulnerable to older flaws.

Execution

1 technique

T1059.004Unix ShellEvidence1

The malware used on SonicWall devices consists of an ELF binary, the TinyShell backdoor, and several bash scripts... The threat actors achieved this by using scripts that offer redundancy and ensure long-term access to breached devices.

Persistence

1 technique

T1037Boot or Logon Initialization ScriptsEvidence1

For example, there's a script named 'iptabled' that is essentially the same module as firewalld but will be only called by the startup script ('rc.local') if the primary malware process exits, crashes, or can't be launched.

Privilege Escalation

1 technique

T1037Boot or Logon Initialization ScriptsEvidence1

Credential Access

1 technique

T1003OS Credential DumpingEvidence1

The main module, named 'firewalld,' executes SQL commands against the appliance's database to steal the hashed credentials of all logged-in users. The stolen credentials are copied on a text file created by the attacker at 'tmp/syslog.db' and are later retrieved to be cracked offline.

Command and Control

1 technique

T1219Remote Access ToolsEvidence1

Additionally, firewalld launches other malware components, like TinyShell, to establish a reverse shell on the appliance for easy remote access.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

bleeping computerNews

Mar 9, 2023

SonicWall devices infected by malware that survives firmware upgrades

A custom main malware module for SonicWall devices that steals hashed user credentials from the appliance database, writes them to a file for offline cracking, launches TinyShell for reverse shell access, and patches a legitimate SonicWall binary to improve persistence or stability.

Mar 9, 2023

Chinese cyberspies target unpatched SonicWall gear

Malicious bash script used in UNC4540's SonicWall appliance campaign to steal credentials through SQL commands and execute additional malware components. This entry refers to the malicious script described in the article, not legitimate firewall software.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets match these IOCs, which detections are missing, which campaigns to expect next, and what to do in the next 30 minutes.

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IOC matching

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution1

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

MITRE ATT&CK mapping5

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.

Back to malware

MalwareUsed by 1 actor

firewalld

For your environment

Hunt this family in your stack

Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.

Start free trial

THREAT ACTORS

Groups observed using it

1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

View more details

UNC4540

The malware uses a bash script named firewalld that executes a SQL command to steal credentials and execute other components, including the TinyShell backdoor.

via register securitytheregister.com

MITRE ATT&CK

Techniques & procedures

5 distinct techniques documented for this family, organized by ATT&CK tactic.

Initial Access

1 technique

T1190Exploit Public-Facing ApplicationEvidence1

Execution

1 technique

T1059.004Unix ShellEvidence1

Persistence

1 technique

T1037Boot or Logon Initialization ScriptsEvidence1

Privilege Escalation

1 technique

T1037Boot or Logon Initialization ScriptsEvidence1

Credential Access

1 technique

T1003OS Credential DumpingEvidence1

Command and Control

1 technique

T1219Remote Access ToolsEvidence1

Additionally, firewalld launches other malware components, like TinyShell, to establish a reverse shell on the appliance for easy remote access.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

bleeping computerNews

Mar 9, 2023

SonicWall devices infected by malware that survives firmware upgrades

Mar 9, 2023

Chinese cyberspies target unpatched SonicWall gear

What this page doesn’t show

The version that knows your environment.

Start free trial

IOC matching

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution1

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

MITRE ATT&CK mapping5

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.