New Self Extracting Package Created Via IExpress.EXE

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

Detects the "iexpress.exe" utility creating self-extracting packages. Attackers where seen leveraging "iexpress" to compile packages on the fly via ".sed" files. Investigate the command line options provided to "iexpress" and in case of a ".sed" file, check the contents and legitimacy of it.

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1218` System Binary Proxy Execution

Event coverage

Provider	Event	Title
Sysmon	Event ID 1	Process creation

Rule body yaml

title: New Self Extracting Package Created Via IExpress.EXE
id: c2b478fc-09bf-40b2-8768-ab3ec8d61c9a
status: test
description: |
    Detects the "iexpress.exe" utility creating self-extracting packages.
    Attackers where seen leveraging "iexpress" to compile packages on the fly via ".sed" files.
    Investigate the command line options provided to "iexpress" and in case of a ".sed" file, check the contents and legitimacy of it.
references:
    - https://strontic.github.io/xcyclopedia/library/iexpress.exe-D594B2A33EFAFD0EABF09E3FDC05FCEA.html
    - https://en.wikipedia.org/wiki/IExpress
    - https://decoded.avast.io/janvojtesek/raspberry-robins-roshtyak-a-little-lesson-in-trickery/
    - https://www.virustotal.com/gui/file/602f4ae507fa8de57ada079adff25a6c2a899bd25cd092d0af7e62cdb619c93c/behavior
author: Joseliyo Sanchez, @Joseliyo_Jstnk
date: 2024-02-05
tags:
    - attack.stealth
    - attack.t1218
    - detection.threat-hunting
logsource:
    category: process_creation
    product: windows
detection:
    selection_1_parent:
        ParentImage|endswith: '\iexpress.exe'
    selection_1_img:
        - Image|endswith: '\makecab.exe'
        - OriginalFileName: 'makecab.exe'
    selection_2_img:
        - Image|endswith: '\iexpress.exe'
        - OriginalFileName: 'IEXPRESS.exe'
    selection_2_cli:
        CommandLine|contains: ' /n '
    condition: all of selection_1_* or all of selection_2_*
falsepositives:
    - Administrators building packages using iexpress.exe
level: medium

Stages and Predicates

Stage 0: `condition`

all of selection_1_* or all of selection_2_*

Stage 1: `selection_1_parent`

selection_1_parent:
    ParentImage|endswith: '\iexpress.exe'

Stage 2: `selection_1_img`

selection_1_img:
    - Image|endswith: '\makecab.exe'
    - OriginalFileName: 'makecab.exe'

Stage 3: `selection_2_img`

selection_2_img:
    - Image|endswith: '\iexpress.exe'
    - OriginalFileName: 'IEXPRESS.exe'

Stage 4: `selection_2_cli`

selection_2_cli:
    CommandLine|contains: ' /n '

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	`/n` corpus 2 (sigma 2)
`Image`	ends_with	`\iexpress.exe` corpus 2 (sigma 2) `\makecab.exe` corpus 5 (sigma 5)
`OriginalFileName`	eq	`IEXPRESS.exe` corpus 2 (sigma 2) `makecab.exe`
`ParentImage`	ends_with	`\iexpress.exe`

`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 Self Extracting Package Created Via IExpress.EXE

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_1_parent`

Stage 2: `selection_1_img`

Stage 3: `selection_2_img`

Stage 4: `selection_2_cli`

Indicators

Keyboard shortcuts

Search operators

New Self Extracting Package Created Via IExpress.EXE

MITRE ATT&CK coverage

Event coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_1_parent

Stage 2: selection_1_img

Stage 3: selection_2_img

Stage 4: selection_2_cli

Indicators

Stage 0: `condition`

Stage 1: `selection_1_parent`

Stage 2: `selection_1_img`

Stage 3: `selection_2_img`

Stage 4: `selection_2_cli`