The tinhvan rule detects potential adversary behavior involving suspicious file artifacts that may indicate initial compromise or lateral movement within a network. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage threats before they escalate.
YARA Rule
rule tinhvan : android
{
meta:
author = "https://twitter.com/plutec_net"
reference = "https://koodous.com/"
sample = "0f7e995ff7075af2d0f8d60322975d610e888884922a89fda9a61c228374c5c5"
condition:
androguard.certificate.sha1("0DFBBDB7735517748C3DEF3B6DEC2A800182D1D5")
}This YARA rule can be deployed in the following contexts:
Scenario: A legitimate system update or patching process using Ansible or Chef that includes files matching the YARA signature.
Filter/Exclusion: Exclude files with known update metadata (e.g., *.rpm, *.deb, *.msi) or files located in standard update directories like /var/cache/apt/archives/ or C:\Windows\Temp\.
Scenario: A scheduled job using PowerShell or Task Scheduler that generates temporary files with the same signature as the malicious pattern.
Filter/Exclusion: Exclude files created by scheduled tasks in known system directories (e.g., C:\Windows\Tasks\, /etc/cron.d/) or files with timestamps matching scheduled job execution times.
Scenario: A legitimate log file or audit trail generated by ELK Stack (Elasticsearch, Logstash, Kibana) or Splunk that contains the same string pattern.
Filter/Exclusion: Exclude files with known log formats (e.g., *.log, *.json) or files located in log directories like /var/log/ or C:\ProgramData\Splunk\logs\.
Scenario: A software development team using Git or SVN that includes files with the same signature due to code formatting or version control metadata.
Filter/Exclusion: Exclude files in version control directories (e.g., .git/, .svn/) or files with known source code patterns (e.g., *.py, *.java, *.js).
Scenario: A system administrator using Windows Task Scheduler or crontab to run a legitimate script that temporarily generates files matching the YARA rule.
Filter/Exclusion: Exclude files with known script execution patterns (e.g., *.bat, *.sh,