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patel-bhavin
77 lines
3.2 KiB
YAML
77 lines
3.2 KiB
YAML
name: Resize ShadowStorage volume
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id: bc760ca6-8336-11eb-bcbb-acde48001122
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version: 1
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date: '2021-03-12'
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author: Teoderick Contreras
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytics identifies the resizing of shadowstorage by ransomware
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malware to avoid the shadow volumes being made again. this technique is an alternative
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by ransomware attacker than deleting the shadowstorage which is known alert in defensive
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team. one example of ransomware that use this technique is CLOP ransomware where
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it drops a .bat file that will resize the shadowstorage to minimum size as much
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as possible
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search: '| tstats `security_content_summariesonly` values(Processes.process) as cmdline
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values(Processes.parent_process_name) as parent_process values(Processes.process_name)
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as process_name min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where Processes.parent_process_name = "cmd.exe" OR Processes.parent_process_name
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= "powershell.exe" OR Processes.parent_process_name = "powershell_ise.exe" OR Processes.parent_process_name
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= "wmic.exe" Processes.process_name = "vssadmin.exe" Processes.process="*resize*"
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Processes.process="*shadowstorage*" Processes.process="*/maxsize*" by Processes.parent_process_name
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Processes.parent_process Processes.process_name Processes.process Processes.dest
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Processes.user Processes.process_id Processes.process_guid | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` |`security_content_ctime(lastTime)` | `resize_shadowstorage_volume_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: network admin can resize the shadowstorage for valid purposes.
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references:
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- https://www.mandiant.com/resources/fin11-email-campaigns-precursor-for-ransomware-data-theft
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- https://blog.virustotal.com/2020/11/keep-your-friends-close-keep-ransomware.html
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1490/T1490.md
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- https://redcanary.com/blog/blackbyte-ransomware/
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- https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/vssadmin-resize-shadowstorage
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tags:
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analytic_story:
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- Clop Ransomware
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confidence: 90
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context:
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- Source:Endpoint
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/clop/clop_a/windows-sysmon.log
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impact: 80
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kill_chain_phases:
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- Exploitation
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message: A process $parent_process_name$ attempt to resize shadow copy with commandline
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$process$ in host $dest$
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mitre_attack_id:
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- T1490
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observable:
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: user
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type: User
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role:
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- Victim
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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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- Processes.process
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- Processes.parent_process_name
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- _time
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- Processes.process_name
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- Processes.parent_process
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- Processes.dest
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- Processes.user
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risk_score: 72
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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