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Convert indexed Sigma rules into analyst-ready detections.
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Newest: 2.0.2
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Active Rule
Self Extracting Package Creation Via Iexpress.EXE From Potentially Suspicious Location
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Self Extracting Package Creation Via Iexpress.EXE From Potentially Suspicious Location
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Self Extracting Package Creation Via Iexpress.EXE From Potentially Suspicious Location
id: b2b048b0-7857-4380-b0fb-d3f0ab820b71
status: test
description: |
Detects the use of iexpress.exe to create binaries via Self Extraction Directive (SED) files located in potentially suspicious locations.
This behavior has been observed in-the-wild by different threat actors.
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, Nasreddine Bencherchali (Nextron Systems)
date: 2024-02-05
modified: 2024-06-04
tags:
- attack.defense-evasion
- attack.t1218
logsource:
category: process_creation
product: windows
detection:
# VT Query: behavior_processes:"iexpress.exe" and behavior_processes:"/n /q /m" and behavior_processes:"*.sed*" and p:5+
selection_img:
- Image|endswith: '\iexpress.exe'
- OriginalFileName: 'IEXPRESS.exe'
selection_cli:
CommandLine|contains|windash: ' /n '
selection_paths:
CommandLine|contains:
# Note: Add more uncommon paths that fit your organizational needs.
- ':\ProgramData\'
- ':\Temp\'
- ':\Windows\System32\Tasks\'
- ':\Windows\Tasks\'
- ':\Windows\Temp\'
- '\AppData\Local\Temp\'
condition: all of selection_*
falsepositives:
- Administrators building packages using iexpress.exe
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_iexpress_susp_execution.yml