Msiexec Quiet Installation

Status: test
Severity: medium
Log source: product windows, category process_creation
Author: frack113
Source: github.com/SigmaHQ/sigma

Adversaries may abuse msiexec.exe to proxy execution of malicious payloads. Msiexec.exe is the command-line utility for the Windows Installer and is thus commonly associated with executing installation packages (.msi)

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1218.007` System Binary Proxy Execution: Msiexec

Event coverage

Provider	Event	Title
Sysmon	Event ID 1	Process creation

Rule body yaml

title: Msiexec Quiet Installation
id: 79a87aa6-e4bd-42fc-a5bb-5e6fbdcd62f5
status: test
description: |
    Adversaries may abuse msiexec.exe to proxy execution of malicious payloads.
    Msiexec.exe is the command-line utility for the Windows Installer and is thus commonly associated with executing installation packages (.msi)
references:
    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/msiexec
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218.007/T1218.007.md
    - https://twitter.com/_st0pp3r_/status/1583914244344799235
author: frack113
date: 2022-01-16
modified: 2024-12-01
tags:
    - attack.stealth
    - attack.t1218.007
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\msiexec.exe'
        - OriginalFileName: 'msiexec.exe'
    selection_cli:
        # Note that there is no space before and after the arguments because it's possible to write a commandline as such
        # Example: msiexec -q/i [MSI Package]
        CommandLine|contains|windash:
            - '-i'
            - '-package'
            - '-a'
            - '-j'
    selection_quiet:
        CommandLine|contains|windash: '-q'
    filter_user_temp:
        # The %temp% is a very common location for installers
        ParentImage|startswith: 'C:\Users\'
        ParentImage|contains: '\AppData\Local\Temp\'
    filter_system_temp:
        ParentImage|startswith: 'C:\Windows\Temp\'
    filter_ccm:
        ParentImage: 'C:\Windows\CCM\Ccm32BitLauncher.exe'
        IntegrityLevel:
            - 'System'
            - 'S-1-16-16384'
    condition: all of selection_* and not 1 of filter_*
falsepositives:
    - WindowsApps installing updates via the quiet flag
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_* and not 1 of filter_*

Stage 1: `selection_img`

selection_img:
    - Image|endswith: '\msiexec.exe'
    - OriginalFileName: 'msiexec.exe'

Stage 2: `selection_cli`

selection_cli:
    CommandLine|contains|windash:
        - '-i'
        - '-package'
        - '-a'
        - '-j'

Stage 3: `selection_quiet`

selection_quiet:
    CommandLine|contains|windash: '-q'

Stage 4: `not filter_*`

filter_user_temp:
    ParentImage|startswith: 'C:\Users\'
    ParentImage|contains: '\AppData\Local\Temp\'
filter_system_temp:
    ParentImage|startswith: 'C:\Windows\Temp\'
filter_ccm:
    ParentImage: 'C:\Windows\CCM\Ccm32BitLauncher.exe'
    IntegrityLevel:
        - 'System'
        - 'S-1-16-16384'

Exclusions

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

Field	Kind	Excluded values
`IntegrityLevel`	eq	`S-1-16-16384`
`IntegrityLevel`	eq	`System`
`ParentImage`	eq	`C:\Windows\CCM\Ccm32BitLauncher.exe`
`ParentImage`	match	`\AppData\Local\Temp\`
`ParentImage`	starts_with	`C:\Users\`
`ParentImage`	starts_with	`C:\Windows\Temp\`

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
`CommandLine`	match	`-a` transforms: `windash` corpus 7 (sigma 6, splunk 1) `-i` transforms: `windash` corpus 7 (sigma 7) `-j` transforms: `windash` corpus 2 (sigma 2) `-package` transforms: `windash` corpus 2 (sigma 2) `-q` transforms: `windash` corpus 9 (sigma 6, kusto 2, splunk 1)
`Image`	ends_with	`\msiexec.exe` corpus 21 (sigma 21)
`OriginalFileName`	eq	`msiexec.exe` corpus 10 (sigma 5, splunk 4, elastic 1)

`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)

Msiexec Quiet Installation

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli`

Stage 3: `selection_quiet`

Stage 4: `not filter_*`

Exclusions

Indicators

Keyboard shortcuts

Search operators

Msiexec Quiet Installation

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_img

Stage 2: selection_cli

Stage 3: selection_quiet

Stage 4: not filter_*

Exclusions

Indicators

Stage 0: `condition`

Stage 1: `selection_img`

Stage 2: `selection_cli`

Stage 3: `selection_quiet`

Stage 4: `not filter_*`