Darshan Thummar
@MightyCompletionist
1 follower12 downloads680 copies5 likes8,359 views
2,107 detections
Filters
Last updated
All Time
Detection languages
1,335
772
Categories
696
574
337
315
284
Platforms
1,363
586
192
85
85
Products / Services
1,327
297
79
39
34
MITRE Techniques
525
343
321
228
207
CVEs
1
1
IDS Classtypes
592
177
160
120
93
IDS Protocols
747
411
58
44
30
This rule detects attempts to inject OLE (Object Linking and Embedding) objects into web requests, specifically looking for the keywords 'CLSID' and 'ProgID' within the HTTP client body. This technique can be used for inter-process communication and potentially lead to arbitrary code execution or other forms of attack.
This rule detects an HTML file being served to a client that contains an embedded Base64 encoded executable payload. It specifically looks for the HTML download attribute (<a download=), the 'base64,' string, and the 'TVQAA' string, which is a common signature for the beginning of a Base64 encoded Windows executable (MZ header). The detection is performed on HTTP traffic flowing to the client.
This rule detects HTTP responses containing a payload that appears to be XOR encrypted. It specifically looks for a sequence of at least 200 bytes consisting of non-printable ASCII characters (0x01-0x1f and 0x7f-0xff) within the file data of an HTTP response flowing to the client. This pattern is indicative of XOR encryption, often used by malware to obfuscate its payload.
This rule detects the delivery of a malicious LNK file via HTTP that utilizes icon smuggling. It specifically looks for HTTP responses containing a URI with ".lnk" and the byte sequence "|4C 00 00 00|" at the beginning of the file data, which is characteristic of LNK files. Icon smuggling is a defense evasion technique where a malicious file disguises itself with a legitimate icon to trick users into executing it.
This rule detects attempts to disable the Linux Auditd service via a remote SSH connection. It specifically looks for the string "systemctl stop auditd" within TCP traffic destined for port 22 (SSH). Disabling auditd can be an attempt by an attacker to evade detection by removing system auditing capabilities.
This rule detects the presence of a Right-to-Left Override (RLO) character sequence in the content of an email sent over SMTP. The RLO character (U+202E, represented as E2 80 AE in UTF-8) is often used in phishing or malware campaigns to visually reverse the order of characters in a filename, making an executable file appear to be a benign file type (e.g., 'document.txt.exe' could appear as 'document.exe.txt'). The rule specifically looks for this byte sequence in traffic destined for port 25 (SMTP) and flags it as trojan activity.
This rule detects attempts to clear syslog files by looking for the command 'truncate -s 0' followed by 'syslog' within an SSH session. This activity is often associated with an attacker trying to remove evidence of their presence on a compromised system.
This rule detects the download of a ClickOnce application manifest that contains specific content indicating it might be malicious. It looks for HTTP responses (flow:to_client,established) where the URI contains ".application" (case-insensitive) and the file data contains "asmv1:assembly" (case-insensitive). This combination suggests a ClickOnce deployment, which can be abused to deliver malware.
This rule detects network traffic indicating the deletion of a persistence registry key, specifically 'CurrentVersion\\Run', after an execution. It looks for TCP traffic to the home network on port 445 (SMB) containing both 'CurrentVersion\\Run' and 'RegDeleteKey' (case-insensitive). This behavior is often associated with malware attempting to clean up its persistence mechanisms to evade detection.
This rule detects HTTP traffic where the URI contains both "pcalua" and "-a" (case-insensitive). This pattern is indicative of indirect execution via pcalua.exe, a legitimate Windows utility that can be abused by attackers to proxy execution of other programs, often for defense evasion. The rule specifically looks for this behavior in HTTP requests, suggesting an attempt to download or execute a payload indirectly.
Page 60 of 211