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tccontre
76 lines
2.9 KiB
YAML
76 lines
2.9 KiB
YAML
name: Suspicious Image Creation In Appdata Folder
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id: f6f904c4-1ac0-11ec-806b-acde48001122
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version: 2
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date: '2022-07-07'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This search is to detect a suspicious creation of image in appdata folder
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made by process that also has a file reference in appdata folder. This technique
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was seen in remcos rat that capture screenshot of the compromised machine and place
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it in the appdata and will be send to its C2 server. This TTP is really a good indicator
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to check that process because it is in suspicious folder path and image files are
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not commonly created by user in this folder path.
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search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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where Processes.process_name=*.exe Processes.process_path="*\\appdata\\Roaming\\*"
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by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest Processes.process_guid
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| `drop_dm_object_name(Processes)`
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|rename process_guid as proc_guid
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|join proc_guid, _time [| tstats `security_content_summariesonly`
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count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem
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where Filesystem.file_name IN ("*.png","*.jpg","*.bmp","*.gif","*.tiff") Filesystem.file_path= "*\\appdata\\Roaming\\*"
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by _time span=1h Filesystem.dest Filesystem.file_create_time Filesystem.file_name Filesystem.file_path Filesystem.process_guid
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| `drop_dm_object_name(Filesystem)`
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|rename process_guid as proc_guid | fields _time dest file_create_time file_name file_path process_name process_path
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process proc_guid]
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| `suspicious_image_creation_in_appdata_folder_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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known_false_positives: unknown
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references:
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- https://success.trendmicro.com/dcx/s/solution/1123281-remcos-malware-information?language=en_US
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- https://blog.malwarebytes.com/threat-intelligence/2021/07/remcos-rat-delivered-via-visual-basic/
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tags:
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analytic_story:
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- Remcos
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Collection
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/remcos/remcos_agent/sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: process $process_name$ creating image file $file_path$ in $dest$
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mitre_attack_id:
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- T1113
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observable:
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- name: Computer
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type: Hostname
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role:
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- Victim
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- name: process_name
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type: Process
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role:
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- Attacker
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- dest
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- file_create_time
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- file_name
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- file_path
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- process_name
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- process_path
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- process
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risk_score: 49
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security_domain: endpoint
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asset_type: Endpoint
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