Ibrahim Saud
@tektrixIndiaCompletionist
2 followers18,457 downloads7,056 copies47 likes38,418 views
11,679 detections
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Detects the Python Imaging Library (PIL) memory leak used to bypass ASLR prior to the JPEG2000 heap overflow. This KQL query specifically looks for syslog messages containing 'cannot identify image file' and 'BytesIO object at 0x', which are indicators of this specific memory leak vulnerability being triggered.
Detects anomalous file modification or deletion events targeting the SSH known_hosts file. This activity can be indicative of VECT ransomware, which zeroes out this file across compromised Linux and ESXi systems to suppress host-key warnings, enabling silent lateral movement via SCP and SSH.
This rule detects potential exploitation of CVE-2026-4892 by correlating inbound DHCPv6 traffic (UDP/547) with a dnsmasq process crash (SIGSEGV/SIGABRT exit codes 132, 134, 135, 139) on the same host within a 60-second window. This vulnerability involves sending crafted DHCPv6 messages with oversized Client Identifier options to a dnsmasq server configured with --dhcp-script, leading to a denial of service.
Detects references to the ChainShell installer script 'VfZUSQi6oerKau.js' within process command lines. This script is associated with the MuddyWater threat group.
Detects thousands of OneDrive or SharePoint file downloads by a single account during a short period, indicating automated collection rather than ordinary user activity.
Detects the initial intrusion vector where a compromised RMM agent (ScreenConnect, AnyDesk, TeamViewer) spawns a command shell to perform local network reconnaissance using commands like nltest, ping, ipconfig, whoami, or net group.
Correlates the recent download of an .rdp file with its execution by mstsc.exe, initiating the outbound connection to the attacker's infrastructure.
This rule detects the use of BITSAdmin to transfer files from a remote HTTP/HTTPS source where the downloaded file has a common arbitrary extension (txt, dat, bin, jpg) but is being renamed to a .dll extension. This technique is often used by adversaries to stealthily download secondary loaders or malicious DLLs.
Detects curl or wget fetching a secondary payload (like AMOS or ClearFake) directly into the /tmp directory, a volatile location to hide execution artifacts. The rule specifically looks for command-line arguments that use '-o' to specify a destination path within /tmp with common executable or package extensions.
Detects the ClickOnce shim DLL (dfshim.dll) being loaded by non-standard processes, indicating potential sideloading or execution abuse. The rule specifically excludes common legitimate processes like explorer.exe, rundll32.exe, dfsvc.exe, and presentationhost.exe from triggering an alert.
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