pico_ransomware
YARA-2025-0611
Critical
general
Active
Rule to detect Pico Ransomware
pico_ransomware.yar
Valid Syntax
rule pico_ransomware {
meta:
description = "Rule to detect Pico Ransomware"
author = "Marc Rivero | @seifreed"
reference = "https://twitter.com/siri_urz/status/1035138577934557184"
strings:
$s1 = "C:\\Users\\rikfe\\Desktop\\Ransomware\\ThanatosSource\\Release\\Ransomware.pdb" fullword ascii
$s2 = "\\Downloads\\README.txt" fullword ascii
$s3 = "\\Music\\README.txt" fullword ascii
$s4 = "\\Videos\\README.txt" fullword ascii
$s5 = "\\Pictures\\README.txt" fullword ascii
$s6 = "\\Desktop\\README.txt" fullword ascii
$s7 = "\\Documents\\README.txt" fullword ascii
$s8 = "/c taskkill /im " fullword ascii
$s9 = "\\AppData\\Roaming\\" fullword ascii
$s10 = "gMozilla/5.0 (Windows NT 6.1) Thanatos/1.1" fullword wide
$s11 = "AppData\\Roaming" fullword ascii
$s12 = "\\Downloads" fullword ascii
$s13 = "operator co_await" fullword ascii
condition:
( uint16(0) == 0x5a4d and filesize < 700KB ) and all of them
}
Rule Metadata
description
Rule to detect Pico Ransomware
author
Marc Rivero | @seifreed
reference
https://twitter.com/siri_urz/status/1035138577934557184
String Definitions
{"name":"$s1","value":"\"C:\\\\Users\\\\rikfe\\\\Desktop\\\\Ransomware\\\\ThanatosSource\\\\Release\\\\Ransomware.pdb\" fullword ascii"}
{"name":"$s2","value":"\"\\\\Downloads\\\\README.txt\" fullword ascii"}
{"name":"$s3","value":"\"\\\\Music\\\\README.txt\" fullword ascii"}
{"name":"$s4","value":"\"\\\\Videos\\\\README.txt\" fullword ascii"}
{"name":"$s5","value":"\"\\\\Pictures\\\\README.txt\" fullword ascii"}
{"name":"$s6","value":"\"\\\\Desktop\\\\README.txt\" fullword ascii"}
{"name":"$s7","value":"\"\\\\Documents\\\\README.txt\" fullword ascii"}
{"name":"$s8","value":"\"\/c taskkill \/im \" fullword ascii"}
{"name":"$s9","value":"\"\\\\AppData\\\\Roaming\\\\\" fullword ascii"}
{"name":"$s10","value":"\"gMozilla\/5.0 (Windows NT 6.1) Thanatos\/1.1\" fullword wide"}
{"name":"$s11","value":"\"AppData\\\\Roaming\" fullword ascii"}
{"name":"$s12","value":"\"\\\\Downloads\" fullword ascii"}
{"name":"$s13","value":"\"operator co_await\" fullword ascii"}
Threat Analysis
This YARA rule is designed to detect general threats.
Severity Level: Critical
The rule uses pattern matching to identify specific byte sequences, strings, or behavioral patterns associated with malicious activity.
Detection Capabilities
- File-based detection for executables and documents
- Memory scanning for running processes
- Network traffic analysis support
Command Line Usage
# Scan a single file yara pico_ransomware.yar /path/to/suspicious/file # Scan a directory recursively yara -r pico_ransomware.yar /path/to/directory/ # Scan with metadata output yara -m pico_ransomware.yar target_file # Scan process memory (Linux) yara pico_ransomware.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='pico_ransomware.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=pico_ransomware.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-0611
Author
Repository
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never
Threat Intelligence
Risk Level
Critical
Category
general
Detection Confidence
Analysis Pending
False Positive Rate
Not Available
Last Seen in Wild
No Data
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