New executable via Office FileUploaded Operation

Status: available
Severity: low
Time window: 8d
Group by: ClientIP, OfficeWorkload, Operation, RecordType, SiteUrlUserFolder, Site_Url, UserId, UserIdDiffThanUserFolder, UserIdUserFolderFormat, UserKey, UserType
Source: github.com/Azure/Azure-Sentinel

Identifies when executable file types are uploaded to Office services such as SharePoint and OneDrive. List currently includes 'exe', 'inf', 'gzip', 'cmd', 'bat' file extensions. Additionally, identifies when a given user is uploading these files to another users workspace. This may be indication of a staging location for malware or other malicious activity.

MITRE ATT&CK coverage

Tactic	Techniques
Lateral Movement	`T1570` Lateral Tool Transfer
Command & Control	`T1105` Ingress Tool Transfer

Event coverage

Provider	Event
M365-SharePointFileOperation	FileUploaded

Rules detecting the same action

Other rules on this platform that filter on the same API call or operation.

Rule body kusto

id: d722831e-88f5-4e25-b106-4ef6e29f8c13
name: New executable via Office FileUploaded Operation
description: |
  'Identifies when executable file types are uploaded to Office services such as SharePoint and OneDrive.
  List currently includes 'exe', 'inf', 'gzip', 'cmd', 'bat' file extensions.
  Additionally, identifies when a given user is uploading these files to another users workspace.
  This may be indication of a staging location for malware or other malicious activity.'
severity: Low
status: Available
requiredDataConnectors:
  - connectorId: Office365
    dataTypes:
      - OfficeActivity (SharePoint) 
queryFrequency: 1d
queryPeriod: 8d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CommandAndControl
  - LateralMovement
relevantTechniques:
  - T1105
  - T1570
query: |
  // a threshold can be enabled, see commented line below for PrevSeenCount
  let threshold = 2;
  let uploadOp = 'FileUploaded';
  // Extensions that are interesting. Add/Remove to this list as you see fit
  let execExt = dynamic(['exe', 'inf', 'gzip', 'cmd', 'bat']);
  let starttime = 8d;
  let endtime = 1d;
  OfficeActivity | where TimeGenerated >= ago(endtime)
  // Limited to File Uploads due to potential noise, comment out the Operation statement below to include any operation type
  // Additional, but potentially noisy operation types that include Uploads and Downloads can be included by adding the following - Operation contains "upload" or Operation contains "download"
  | where Operation =~ uploadOp
  | where SourceFileExtension has_any (execExt)
  | project TimeGenerated, OfficeId, OfficeWorkload, RecordType, Operation, UserType, UserKey, UserId, ClientIP, UserAgent, Site_Url, SourceRelativeUrl, SourceFileName
  | join kind= leftanti (
  OfficeActivity | where TimeGenerated between (ago(starttime) .. ago(endtime))
  | where Operation =~ uploadOp
  | where SourceFileExtension has_any (execExt)
  | summarize SourceRelativeUrl = make_set(SourceRelativeUrl, 100000), UserId = make_set(UserId, 100000) , PrevSeenCount = count() by SourceFileName
  // To exclude previous matches when only above a specific count, change threshold above and uncomment the line below
  //| where PrevSeenCount > threshold
  | mvexpand SourceRelativeUrl, UserId
  | extend SourceRelativeUrl = tostring(SourceRelativeUrl), UserId = tostring(UserId)
  ) on SourceFileName, SourceRelativeUrl, UserId
  | extend SiteUrlUserFolder = tolower(split(Site_Url, '/')[-2])
  | extend UserIdUserFolderFormat = tolower(replace_regex(UserId, '@|\\.', '_'))
  // identify when UserId is not a match to the specific site url personal folder reference
  | extend UserIdDiffThanUserFolder = iff(Site_Url has '/personal/' and SiteUrlUserFolder != UserIdUserFolderFormat, true , false )
  | summarize TimeGenerated = make_list(TimeGenerated, 100000), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated),
  UserAgents = make_list(UserAgent, 100000), OfficeIds = make_list(OfficeId, 100000), SourceRelativeUrls = make_list(SourceRelativeUrl, 100000), FileNames = make_list(SourceFileName, 100000)
  by OfficeWorkload, RecordType, Operation, UserType, UserKey, UserId, ClientIP, Site_Url, SiteUrlUserFolder, UserIdUserFolderFormat, UserIdDiffThanUserFolder
  | extend AccountName = tostring(split(UserId, "@")[0]), AccountUPNSuffix = tostring(split(UserId, "@")[1])
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: UserId
      - identifier: Name
        columnName: AccountName
      - identifier: UPNSuffix
        columnName: AccountUPNSuffix
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: ClientIP
  - entityType: URL
    fieldMappings:
      - identifier: Url
        columnName: Site_Url
  - entityType: File
    fieldMappings:
      - identifier: Name
        columnName: FileNames       
version: 2.0.5
kind: Scheduled

Stages and Predicates

Parameters

let threshold = 2;
let uploadOp = 'FileUploaded';
let execExt = dynamic(['exe', 'inf', 'gzip', 'cmd', 'bat']);
let starttime = 8d;
let endtime = 1d;

Stage 1: `source`

OfficeActivity

Stage 2: `where`

| where TimeGenerated >= ago(endtime)

Stage 3: `where`

| where Operation =~ uploadOp

Stage 4: `where`

| where SourceFileExtension has_any (execExt)

Stage 5: `project`

| project TimeGenerated, OfficeId, OfficeWorkload, RecordType, Operation, UserType, UserKey, UserId, ClientIP, UserAgent, Site_Url, SourceRelativeUrl, SourceFileName

Stage 6: `join` (negated)

| join kind= leftanti (
OfficeActivity | where TimeGenerated between (ago(starttime) .. ago(endtime))
| where Operation =~ uploadOp
| where SourceFileExtension has_any (execExt)
| summarize SourceRelativeUrl = make_set(SourceRelativeUrl, 100000), UserId = make_set(UserId, 100000) , PrevSeenCount = count() by SourceFileName
| mvexpand SourceRelativeUrl, UserId
| extend SourceRelativeUrl = tostring(SourceRelativeUrl), UserId = tostring(UserId)
) on SourceFileName, SourceRelativeUrl, UserId

Stage 7: `extend` (3 consecutive steps)

| extend SiteUrlUserFolder = tolower(split(Site_Url, '/')[-2])
| extend UserIdUserFolderFormat = tolower(replace_regex(UserId, '@|\\.', '_'))
| extend UserIdDiffThanUserFolder = iff(Site_Url has '/personal/' and SiteUrlUserFolder != UserIdUserFolderFormat, true , false )

Stage 8: `summarize`

| summarize TimeGenerated = make_list(TimeGenerated, 100000), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated),
UserAgents = make_list(UserAgent, 100000), OfficeIds = make_list(OfficeId, 100000), SourceRelativeUrls = make_list(SourceRelativeUrl, 100000), FileNames = make_list(SourceFileName, 100000)
by OfficeWorkload, RecordType, Operation, UserType, UserKey, UserId, ClientIP, Site_Url, SiteUrlUserFolder, UserIdUserFolderFormat, UserIdDiffThanUserFolder

Stage 9: `extend`

| extend AccountName = tostring(split(UserId, "@")[0]), AccountUPNSuffix = tostring(split(UserId, "@")[1])

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`Operation`	eq	`FileUploaded`
`SourceFileExtension`	match	`exe`, `inf`, `gzip`, `cmd`, `bat`

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`Operation`	eq	`FileUploaded`
`SourceFileExtension`	match	`bat` `cmd` `exe` `gzip` `inf`

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field	Source
`ClientIP`	`summarize`
`EndTime`	`summarize`
`FileNames`	`summarize`
`OfficeIds`	`summarize`
`OfficeWorkload`	`summarize`
`Operation`	`summarize`
`RecordType`	`summarize`
`SiteUrlUserFolder`	`summarize`
`Site_Url`	`summarize`
`SourceRelativeUrls`	`summarize`
`StartTime`	`summarize`
`TimeGenerated`	`summarize`
`UserAgents`	`summarize`
`UserId`	`summarize`
`UserIdDiffThanUserFolder`	`summarize`
`UserIdUserFolderFormat`	`summarize`
`UserKey`	`summarize`
`UserType`	`summarize`
`AccountName`	`extend`
`AccountUPNSuffix`	`extend`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

New executable via Office FileUploaded Operation

MITRE ATT&CK coverage

Event coverage

Rules detecting the same action

Rule body kusto

Stages and Predicates

Parameters

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `where`

Stage 5: `project`

Stage 6: `join` (negated)

Stage 7: `extend` (3 consecutive steps)

Stage 8: `summarize`

Stage 9: `extend`

Exclusions

Indicators

Output fields

Keyboard shortcuts

Search operators

New executable via Office FileUploaded Operation

MITRE ATT&CK coverage

Event coverage

Rules detecting the same action

Rule body kusto

Stages and Predicates

Parameters

Stage 1: source

Stage 2: where

Stage 3: where

Stage 4: where

Stage 5: project

Stage 6: join (negated)

Stage 7: extend (3 consecutive steps)

Stage 8: summarize

Stage 9: extend

Exclusions

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `where`

Stage 4: `where`

Stage 5: `project`

Stage 6: `join` (negated)

Stage 7: `extend` (3 consecutive steps)

Stage 8: `summarize`

Stage 9: `extend`