Potential MOVEit Transfer CVE-2023-34362 Exploitation - File Activity

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

Detects file indicators of potential exploitation of MOVEit CVE-2023-34362.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application

Event coverage

Provider	Event	Title
Sysmon	Event ID 11	FileCreate

Rule body yaml

title: Potential MOVEit Transfer CVE-2023-34362 Exploitation - File Activity
id: c3b2a774-3152-4989-83c1-7afc48fd1599
status: test
description: Detects file indicators of potential exploitation of MOVEit CVE-2023-34362.
references:
    - https://www.bleepingcomputer.com/news/security/new-moveit-transfer-zero-day-mass-exploited-in-data-theft-attacks/
    - https://community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023
    - https://www.rapid7.com/blog/post/2023/06/01/rapid7-observed-exploitation-of-critical-moveit-transfer-vulnerability/
    - https://www.reddit.com/r/sysadmin/comments/13wxuej/comment/jmhdg55/
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-01
modified: 2024-08-13
tags:
    - attack.initial-access
    - attack.t1190
    - cve.2023-34362
    - detection.emerging-threats
logsource:
    category: file_event
    product: windows
detection:
    selection_generic:
        TargetFilename|contains:
            - '\MOVEit Transfer\wwwroot\'
            - '\MOVEitTransfer\wwwroot\'
        TargetFilename|endswith:
            - '.7z'
            - '.bat'
            - '.dll'
            - '.exe'
            - '.ps1'
            - '.rar'
            - '.vbe'
            - '.vbs'
            - '.zip'
    selection_known_ioc:
        TargetFilename|endswith:
            - '\MOVEit Transfer\wwwroot\_human2.aspx.lnk'
            - '\MOVEit Transfer\wwwroot\_human2.aspx'
            - '\MOVEit Transfer\wwwroot\human2.aspx.lnk'
            - '\MOVEit Transfer\wwwroot\human2.aspx'
            - '\MOVEitTransfer\wwwroot\_human2.aspx.lnk'
            - '\MOVEitTransfer\wwwroot\_human2.aspx'
            - '\MOVEitTransfer\wwwroot\human2.aspx.lnk'
            - '\MOVEitTransfer\wwwroot\human2.aspx'
    # Uncomment selection if you wanna threat hunt for additional artifacts
    # selection_cmdline:
    #    TargetFilename|contains: ':\Windows\TEMP\'
    #    TargetFilename|endswith: '.cmdline'
    selection_compiled_asp:
        CreationUtcTime|startswith:
            - '2023-03- '
            - '2023-04- '
            - '2023-05- '
            - '2023-06- '
        TargetFilename|contains|all:
            - '\Windows\Microsoft.net\Framework64\v'
            - '\Temporary ASP.NET Files\'
            - 'App_Web_'
        TargetFilename|endswith: '.dll'
    condition: 1 of selection_*
falsepositives:
    - To avoid FP, this rule should only be applied on MOVEit servers.
level: high

Stages and Predicates

Stage 0: `condition`

1 of selection_*

Stage 1: `selection_generic`

selection_generic:
    TargetFilename|contains:
        - '\MOVEit Transfer\wwwroot\'
        - '\MOVEitTransfer\wwwroot\'
    TargetFilename|endswith:
        - '.7z'
        - '.bat'
        - '.dll'
        - '.exe'
        - '.ps1'
        - '.rar'
        - '.vbe'
        - '.vbs'
        - '.zip'

Stage 2: `selection_known_ioc`

selection_known_ioc:
    TargetFilename|endswith:
        - '\MOVEit Transfer\wwwroot\_human2.aspx.lnk'
        - '\MOVEit Transfer\wwwroot\_human2.aspx'
        - '\MOVEit Transfer\wwwroot\human2.aspx.lnk'
        - '\MOVEit Transfer\wwwroot\human2.aspx'
        - '\MOVEitTransfer\wwwroot\_human2.aspx.lnk'
        - '\MOVEitTransfer\wwwroot\_human2.aspx'
        - '\MOVEitTransfer\wwwroot\human2.aspx.lnk'
        - '\MOVEitTransfer\wwwroot\human2.aspx'

Stage 3: `selection_compiled_asp`

selection_compiled_asp:
    CreationUtcTime|startswith:
        - '2023-03- '
        - '2023-04- '
        - '2023-05- '
        - '2023-06- '
    TargetFilename|contains|all:
        - '\Windows\Microsoft.net\Framework64\v'
        - '\Temporary ASP.NET Files\'
        - 'App_Web_'
    TargetFilename|endswith: '.dll'

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
`CreationUtcTime`	starts_with	`2023-03-` `2023-04-` `2023-05-` `2023-06-`
`TargetFilename`	ends_with	`.7z` corpus 5 (sigma 5) `.bat` corpus 17 (sigma 17) `.dll` corpus 23 (sigma 23) `.exe` corpus 21 (sigma 20, splunk 1) `.ps1` corpus 17 (sigma 17) `.rar` corpus 5 (sigma 5) `.vbe` corpus 15 (sigma 15) `.vbs` corpus 18 (sigma 18) `.zip` corpus 7 (sigma 6, splunk 1) `\MOVEit Transfer\wwwroot\_human2.aspx` `\MOVEit Transfer\wwwroot\_human2.aspx.lnk` `\MOVEit Transfer\wwwroot\human2.aspx` `\MOVEit Transfer\wwwroot\human2.aspx.lnk` `\MOVEitTransfer\wwwroot\_human2.aspx` `\MOVEitTransfer\wwwroot\_human2.aspx.lnk` `\MOVEitTransfer\wwwroot\human2.aspx` `\MOVEitTransfer\wwwroot\human2.aspx.lnk`
`TargetFilename`	match	`App_Web_` `\MOVEit Transfer\wwwroot\` `\MOVEitTransfer\wwwroot\` `\Temporary ASP.NET Files\` corpus 2 (sigma 2) `\Windows\Microsoft.net\Framework64\v`

`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)

Potential MOVEit Transfer CVE-2023-34362 Exploitation - File Activity

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_generic`

Stage 2: `selection_known_ioc`

Stage 3: `selection_compiled_asp`

Indicators

Keyboard shortcuts

Search operators

Potential MOVEit Transfer CVE-2023-34362 Exploitation - File Activity

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_generic

Stage 2: selection_known_ioc

Stage 3: selection_compiled_asp

Indicators

Stage 0: `condition`

Stage 1: `selection_generic`

Stage 2: `selection_known_ioc`

Stage 3: `selection_compiled_asp`