Emerging Threathightest
Qakbot Regsvr32 Calc Pattern
Detects a specific command line of "regsvr32" where the "calc" keyword is used in conjunction with the "/s" flag. This behavior is often seen used by Qakbot
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Launch
Nasreddine Bencherchali (Nextron Systems)Created Fri May 26Updated Tue Mar 050033cf83-fb87-446d-9cac-43d63ad4d5a92023
Emerging Threat
Active Threat
Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic1 selector
detection:
selection:
Image|endswith: '\regsvr32.exe'
CommandLine|contains|windash: ' -s'
CommandLine|endswith: ' calc'
condition: selectionFalse Positives
Unlikely
False positives are unlikely for most environments. High confidence detection.
References
MITRE ATT&CK
Other
detection.emerging-threats
Rule Metadata
Rule ID
0033cf83-fb87-446d-9cac-43d63ad4d5a9
Status
test
Level
high
Type
Emerging Threat
Created
Fri May 26
Modified
Tue Mar 05
Path
rules-emerging-threats/2023/Malware/Qakbot/proc_creation_win_malware_qakbot_regsvr32_calc_pattern.yml
Raw Tags
attack.defense-evasionattack.executiondetection.emerging-threats