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patel-bhavin
102 lines
4.3 KiB
YAML
102 lines
4.3 KiB
YAML
name: Windows Bitsadmin Download File
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id: d76e8188-8f5a-11ec-ace4-acde48001122
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version: 1
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date: '2022-02-16'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint_Processes
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description: The following query identifies Microsoft Background Intelligent Transfer
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Service utility `bitsadmin.exe` using the `transfer` parameter to download a remote
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object. In addition, look for `download` or `upload` on the command-line, the switches
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are not required to perform a transfer. Capture any files downloaded. Review the
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reputation of the IP or domain used. Typically once executed, a follow on command
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will be used to execute the dropped file. Note that the network connection or file
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modification events related will not spawn or create from `bitsadmin.exe`, but the
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artifacts will appear in a parallel process of `svchost.exe` with a command-line
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similar to `svchost.exe -k netsvcs -s BITS`. It's important to review all parallel
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and child processes to capture any behaviors and artifacts. In some suspicious and
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malicious instances, BITS jobs will be created. You can use `bitsadmin /list /verbose`
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to list out the jobs during investigation.
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search: '| from read_ssa_enriched_events() | where "Endpoint_Processes" IN(_datamodels)
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| eval timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)),
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cmd_line=ucast(map_get(input_event, "process"), "string", null), process_name=ucast(map_get(input_event,
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"process_name"), "string", null), process_path=ucast(map_get(input_event, "process_path"),
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"string", null), parent_process_name=ucast(map_get(input_event, "parent_process_name"),
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"string", null), event_id=ucast(map_get(input_event, "event_id"), "string", null)
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| where cmd_line IS NOT NULL AND process_name IS NOT NULL AND process_name="bitsadmin.exe"
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AND (like (cmd_line, "%transfer%")) | eval start_time=timestamp, end_time=timestamp,
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entities=mvappend(ucast(map_get(input_event, "dest_user_id"), "string", null), ucast(map_get(input_event,
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"dest_device_id"), "string", null)) | eval body=create_map(["event_id", event_id,
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"cmd_line", cmd_line, "process_name", process_name, "parent_process_name", parent_process_name,
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"process_path", process_path]) | into write_ssa_detected_events();'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Limited false positives, however it may be required to filter
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based on parent process name or network connection.
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references:
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- https://github.com/redcanaryco/atomic-red-team/blob/8eb52117b748d378325f7719554a896e37bccec7/atomics/T1105/T1105.md#atomic-test-9---windows---bitsadmin-bits-download
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- https://github.com/redcanaryco/atomic-red-team/blob/bc705cb7aaa5f26f2d96585fac8e4c7052df0ff9/atomics/T1197/T1197.md
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- https://docs.microsoft.com/en-us/windows/win32/bits/bitsadmin-tool
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- https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
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tags:
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analytic_story:
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- Ingress Tool Transfer
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- BITS Jobs
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- DarkSide Ransomware
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- Living Off The Land
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automated_detection_testing: passed
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1197/atomic_red_team/bits-windows-security.log
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impact: 70
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cis20:
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- CIS 8
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nist:
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- PR.PT
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- DE.CM
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kill_chain_phases:
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- Exploitation
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $dest_user_id$ attempting to download a file.
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mitre_attack_id:
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- T1197
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- T1105
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observable:
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- name: dest_user_id
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type: User
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role:
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- Victim
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- name: dest_device_id
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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product:
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- Splunk Behavioral Analytics
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required_fields:
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- _time
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- dest_device_id
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- process_name
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- parent_process_name
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- process_path
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- dest_user_id
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- process
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- cmd_line
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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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