Malware

PS1

PS1 is custom malware associated with the CostaRicto threat activity. The provided content identifies PS1 as one of several bespoke malware families used by CostaRicto, alongside CostaBricks and SombRAT. Reported capabilities include use of a PowerShell loader and the ability to inject its payload DLL into memory, indicating in-memory execution and likely defense-evasion tradecraft. No additional high-confidence details on infection vector, platform scope, targeting, or indicators of compromise are provided in the source content.

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MITRE ATT&CK

Techniques & procedures

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

Execution

1 technique

T1059.001PowerShellEvidence5

The content includes multiple examples of PowerShell being used to decode or deobfuscate payloads and commands, such as 'the threat actors deobfuscated encoded PowerShell commands' and 'OilRig macro has run a PowerShell command to decode file contents.'

Privilege Escalation

1 technique

T1055.001Dynamic-link Library InjectionEvidence1

Stealth

4 techniques

T1027Obfuscated Files or InformationEvidence5

The content repeatedly describes payloads, strings, configuration files, scripts, URLs, and binaries being obfuscated or encoded using Base64, XOR, RC4, AES, RSA, hex encoding, custom algorithms, and other methods across many malware families and threat actors.

T1027.013Encrypted/Encoded FileEvidence2

Examples throughout the content include 'encrypted payloads decrypted and executed in memory,' 'encrypts its configuration file,' 'AES-encrypted resource,' 'RC4 encrypted embedded scripts,' and 'payload includes an encrypted main component.'

T1055.001Dynamic-link Library InjectionEvidence1

T1140Deobfuscate/Decode Files or InformationEvidence5

The content repeatedly describes malware and threat actors decoding, decrypting, deobfuscating, or unpacking payloads, strings, configuration data, commands, and C2 responses prior to execution or use.

Command and Control

1 technique

T1105Ingress Tool TransferEvidence1

ACTIVITY FEED

Recent activity

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

7 SOURCESView more in app

mitre attack websiteNews

Oct 21, 2021

Updates - Updates - October 2021 | MITRE ATT&CK®

Enterprise New Software: ... PS1

mitre attack websiteNews

Nov 19, 2019

Command and Scripting Interpreter: PowerShell, Sub-technique T1059.001 - Enterprise | MITRE ATT&CK®

Malware that can utilize a PowerShell loader.

mitre attackNews

Jan 23, 2026

Develop Capabilities: Malware, Sub-technique T1587.001 - Enterprise | MITRE ATT&CK®

Custom malware used by CostaRicto.

mitre attackNews

Jan 24, 2026

Develop Capabilities: Malware, Sub-technique T1587.001 - Enterprise | MITRE ATT&CK®

Custom malware used by CostaRicto.

+3 more in the timeline

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IOC matching

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

Threat actor attribution

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 mapping6

Every documented technique, ranked by evidence weight.

Researcher chatter

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

PS1