Ankit Mehta
@SecvynIndiaTrusted contributorCompletionist
7 followers9,698 downloads10,515 copies160 likes57,270 views
8,654 detections
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Detects HTTP GET requests for files with a .hta extension, utilizing a legacy Internet Explorer User-Agent string. This pattern is commonly associated with SideCopy threat group activities where mshta.exe is used to proxy the execution of remotely hosted malicious HTA files, often as part of an initial infection chain.
Detects the use of legitimate data transfer utilities (s5cmd, rclone) configured to exfiltrate sensitive document types (.doc, .pdf, .sql, etc.) to S3-compatible cloud storage. The rule correlates this activity with recent access to files containing sensitive credentials or configuration data, a pattern observed in double-extortion campaigns.
Detects network activity associated with the APT36 threat group, specifically HTTP requests for PowerShell stagers (irm/iex) from 'indiatodays.org' and TLS connections to that same domain, which is identified as a typosquat used for command and control or ingress tool transfer.
Detects the execution of known tunneling and reverse proxy tools (ngrok, cloudflared, localtunnel) commonly abused by adversaries to create outbound tunnels for C2, bypass firewalls, or exfiltrate data.
This rule detects the modification of Windows Registry Run keys, specifically targeting a value named 'MicrosoftUpdate' within the 'Run' registry path. This is a common persistence technique used by adversaries to ensure malicious programs or scripts automatically execute upon user logon by mimicking a legitimate system update process.
Detects anomalous authentication patterns where a single source IP targets a high number of unique user accounts with failed authentication attempts over a rolling window. By filtering out SSO/Federated methods and specific service account patterns, this rule isolates low-and-slow brute-force or password-spraying activities designed to evade standard account lockout mechanisms.
KQL Query
Detects unauthorized processes accessing sensitive credential storage files (e.g., 'Login Data', 'Cookies', 'Local State') from known Chromium-based browser profile directories. This activity is indicative of credential harvesting by infostealer malware attempting to exfiltrate browser data before performing decryption.
Detects a sequence of activity where a user receives a high volume of inbound emails (potential vishing or social engineering lures) within a short window, followed by the user executing Windows Remote Assistance or Quick Assist tools within the next 6 hours, which is highly indicative of remote access social engineering pre-cursors.
Detects emails that appear to have been injected or sent using the 'swaks' SMTP testing tool rather than a standard Mail User Agent (MUA). The rule identifies this activity by looking for the 'swaks' signature in the 'X-Mailer' header or by matching a specific 'Message-Id' pattern typical of swaks.
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