Unusual File Download From File Sharing Websites - File Stream

Status: test
Severity: medium
Log source: product windows, category create_stream_hash
Author: Florian Roth (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects the download of suspicious file type from a well-known file and paste sharing domain

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1564.004` Hide Artifacts: NTFS File Attributes

Event coverage

Provider	Event	Title
Sysmon	Event ID 15	FileCreateStreamHash

Rule body yaml

title: Unusual File Download From File Sharing Websites - File Stream
id: ae02ed70-11aa-4a22-b397-c0d0e8f6ea99
related:
    - id: 52182dfb-afb7-41db-b4bc-5336cb29b464
      type: similar
status: test
description: Detects the download of suspicious file type from a well-known file and paste sharing domain
references:
    - https://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventid=90015
    - https://www.cisa.gov/uscert/ncas/alerts/aa22-321a
    - https://www.microsoft.com/en-us/security/blog/2024/01/17/new-ttps-observed-in-mint-sandstorm-campaign-targeting-high-profile-individuals-at-universities-and-research-orgs/
author: Florian Roth (Nextron Systems)
date: 2022-08-24
modified: 2025-12-10
tags:
    - attack.stealth
    - attack.s0139
    - attack.t1564.004
logsource:
    product: windows
    category: create_stream_hash
detection:
    selection_domain:
        Contents|contains:
            - '.githubusercontent.com'       # Includes both gists and github repositories / Michael Haag (idea)
            - 'anonfiles.com'
            - 'cdn.discordapp.com'
            - 'ddns.net'
            - 'dl.dropboxusercontent.com'
            - 'ghostbin.co'
            - 'github.com'
            - 'glitch.me'
            - 'gofile.io'
            - 'hastebin.com'
            - 'mediafire.com'
            - 'mega.nz'
            - 'onrender.com'
            - 'pages.dev'
            - 'paste.ee'
            - 'pastebin.com'
            - 'pastebin.pl'
            - 'pastetext.net'
            - 'pixeldrain.com'
            - 'privatlab.com'
            - 'privatlab.net'
            - 'send.exploit.in'
            - 'sendspace.com'
            - 'storage.googleapis.com'
            - 'storjshare.io'
            - 'supabase.co'
            - 'temp.sh'
            - 'transfer.sh'
            - 'trycloudflare.com'
            - 'ufile.io'
            - 'w3spaces.com'
            - 'workers.dev'
    selection_extension:
        TargetFilename|contains:
            - '.bat:Zone'
            - '.cmd:Zone'
            - '.ps1:Zone'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_*

Stage 1: `selection_domain`

selection_domain:
    Contents|contains:
        - '.githubusercontent.com'
        - 'anonfiles.com'
        - 'cdn.discordapp.com'
        - 'ddns.net'
        - 'dl.dropboxusercontent.com'
        - 'ghostbin.co'
        - 'github.com'
        - 'glitch.me'
        - 'gofile.io'
        - 'hastebin.com'
        - 'mediafire.com'
        - 'mega.nz'
        - 'onrender.com'
        - 'pages.dev'
        - 'paste.ee'
        - 'pastebin.com'
        - 'pastebin.pl'
        - 'pastetext.net'
        - 'pixeldrain.com'
        - 'privatlab.com'
        - 'privatlab.net'
        - 'send.exploit.in'
        - 'sendspace.com'
        - 'storage.googleapis.com'
        - 'storjshare.io'
        - 'supabase.co'
        - 'temp.sh'
        - 'transfer.sh'
        - 'trycloudflare.com'
        - 'ufile.io'
        - 'w3spaces.com'
        - 'workers.dev'

Stage 2: `selection_extension`

selection_extension:
    TargetFilename|contains:
        - '.bat:Zone'
        - '.cmd:Zone'
        - '.ps1:Zone'

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
`Contents`	match	`.githubusercontent.com` corpus 2 (sigma 2) `anonfiles.com` corpus 2 (sigma 2) `cdn.discordapp.com` corpus 2 (sigma 2) `ddns.net` corpus 2 (sigma 2) `dl.dropboxusercontent.com` corpus 2 (sigma 2) `ghostbin.co` corpus 2 (sigma 2) `github.com` corpus 2 (sigma 2) `glitch.me` corpus 2 (sigma 2) `gofile.io` corpus 2 (sigma 2) `hastebin.com` corpus 2 (sigma 2) `mediafire.com` corpus 2 (sigma 2) `mega.nz` corpus 2 (sigma 2) `onrender.com` corpus 2 (sigma 2) `pages.dev` corpus 2 (sigma 2) `paste.ee` corpus 2 (sigma 2) `pastebin.com` corpus 2 (sigma 2) `pastebin.pl` corpus 2 (sigma 2) `pastetext.net` corpus 2 (sigma 2) `pixeldrain.com` corpus 2 (sigma 2) `privatlab.com` corpus 2 (sigma 2) `privatlab.net` corpus 2 (sigma 2) `send.exploit.in` corpus 2 (sigma 2) `sendspace.com` corpus 2 (sigma 2) `storage.googleapis.com` corpus 2 (sigma 2) `storjshare.io` corpus 2 (sigma 2) `supabase.co` corpus 2 (sigma 2) `temp.sh` corpus 2 (sigma 2) `transfer.sh` corpus 2 (sigma 2) `trycloudflare.com` corpus 2 (sigma 2) `ufile.io` corpus 2 (sigma 2) `w3spaces.com` corpus 2 (sigma 2) `workers.dev` corpus 2 (sigma 2)
`TargetFilename`	match	`.bat:Zone` corpus 3 (sigma 3) `.cmd:Zone` corpus 2 (sigma 2) `.ps1:Zone` corpus 3 (sigma 3)

`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)

Unusual File Download From File Sharing Websites - File Stream

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_domain`

Stage 2: `selection_extension`

Indicators

Keyboard shortcuts

Search operators

Unusual File Download From File Sharing Websites - File Stream

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_domain

Stage 2: selection_extension

Indicators

Stage 0: `condition`

Stage 1: `selection_domain`

Stage 2: `selection_extension`