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collection_common_compressed_archived_file.toml
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collection_common_compressed_archived_file.toml
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[metadata]
bypass_bbr_timing = true
creation_date = "2023/10/11"
integration = "endpoint"
maturity = "production"
updated_date = "2024/05/21"
[rule]
author = ["Elastic"]
building_block_type = "default"
description = """
Detects files being compressed or archived into common formats. This is a common technique used to obfuscate files to
evade detection or to staging data for exfiltration.
"""
from = "now-9m"
index = ["logs-endpoint.events.file-*"]
language = "eql"
license = "Elastic License v2"
max_signals = 1000
name = "File Compressed or Archived into Common Format"
references = ["https://en.wikipedia.org/wiki/List_of_file_signatures"]
risk_score = 21
rule_id = "79124edf-30a8-4d48-95c4-11522cad94b1"
severity = "low"
tags = [
"Data Source: Elastic Defend",
"Domain: Endpoint",
"OS: macOS",
"OS: Windows",
"Tactic: Collection",
"Rule Type: BBR",
]
timestamp_override = "event.ingested"
type = "eql"
query = '''
file where host.os.type == "windows" and event.type in ("creation", "change") and process.executable != null and not user.id : ("S-1-5-18", "S-1-5-17") and
file.Ext.header_bytes : (
/* compression formats */
"1F9D*", /* tar zip, tar.z (Lempel-Ziv-Welch algorithm) */
"1FA0*", /* tar zip, tar.z (LZH algorithm) */
"425A68*", /* Bzip2 */
"524E4301*", /* Rob Northen Compression */
"524E4302*", /* Rob Northen Compression */
"4C5A4950*", /* LZIP */
"504B0*", /* ZIP */
"526172211A07*", /* RAR compressed */
"44434D0150413330*", /* Windows Update Binary Delta Compression file */
"50413330*", /* Windows Update Binary Delta Compression file */
"377ABCAF271C*", /* 7-Zip */
"1F8B*", /* GZIP */
"FD377A585A00*", /* XZ, tar.xz */
"7801*", /* zlib: No Compression (no preset dictionary) */
"785E*", /* zlib: Best speed (no preset dictionary) */
"789C*", /* zlib: Default Compression (no preset dictionary) */
"78DA*", /* zlib: Best Compression (no preset dictionary) */
"7820*", /* zlib: No Compression (with preset dictionary) */
"787D*", /* zlib: Best speed (with preset dictionary) */
"78BB*", /* zlib: Default Compression (with preset dictionary) */
"78F9*", /* zlib: Best Compression (with preset dictionary) */
"62767832*", /* LZFSE */
"28B52FFD*", /* Zstandard, zst */
"5253564B44415441*", /* QuickZip rs compressed archive */
"2A2A4143452A2A*", /* ACE */
/* archive formats */
"2D686C302D*", /* lzh */
"2D686C352D*", /* lzh */
"303730373037*", /* cpio */
"78617221*", /* xar */
"4F4152*", /* oar */
"49536328*" /* cab archive */
) and
not (
(
process.name : "firefox.exe" and
process.code_signature.subject_name : "Mozilla Corporation" and process.code_signature.trusted == true
) or
(
process.name : "wazuh-agent.exe" and
process.code_signature.subject_name : "Wazuh, Inc" and process.code_signature.trusted == true and
file.name : ("ossec-*.log.gz", "tmp-entry.gz", "tmp-entry", "last-entry.gz")
) or
(
process.name : ("excel.exe", "winword.exe", "powerpnt.exe") and
process.code_signature.subject_name : "Microsoft Corporation" and process.code_signature.trusted == true
) or
(
process.name : "OneDrive.exe" and
process.code_signature.subject_name : "Microsoft Corporation" and process.code_signature.trusted == true and
(
file.extension : ("xlsx", "docx", "pptx", "xlsm") or
file.path : "?:\\Users\\*\\AppData\\Local\\Microsoft\\OneDrive\\logs\\*"
)
) or
(
process.name : "Dropbox.exe" and
process.code_signature.subject_name : "Dropbox, Inc" and process.code_signature.trusted == true and
file.name : "store.bin"
) or
(
process.name : "DellSupportAssistRemedationService.exe" and
process.code_signature.subject_name : "Dell Inc" and process.code_signature.trusted == true and
file.extension : "manifest"
) or
(
process.name : "w3wp.exe" and
process.code_signature.subject_name : "Microsoft Windows" and process.code_signature.trusted == true and
file.path : "?:\\inetpub\\temp\\IIS Temporary Compressed Files\\*"
)
)
'''
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1074"
name = "Data Staged"
reference = "https://attack.mitre.org/techniques/T1074/"
[[rule.threat.technique.subtechnique]]
id = "T1074.001"
name = "Local Data Staging"
reference = "https://attack.mitre.org/techniques/T1074/001/"
[[rule.threat.technique]]
id = "T1560"
name = "Archive Collected Data"
reference = "https://attack.mitre.org/techniques/T1560/"
[[rule.threat.technique.subtechnique]]
id = "T1560.001"
name = "Archive via Utility"
reference = "https://attack.mitre.org/techniques/T1560/001/"
[rule.threat.tactic]
id = "TA0009"
name = "Collection"
reference = "https://attack.mitre.org/tactics/TA0009/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1132"
name = "Data Encoding"
reference = "https://attack.mitre.org/techniques/T1132/"
[[rule.threat.technique.subtechnique]]
id = "T1132.001"
name = "Standard Encoding"
reference = "https://attack.mitre.org/techniques/T1132/001/"
[rule.threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1027"
name = "Obfuscated Files or Information"
reference = "https://attack.mitre.org/techniques/T1027/"
[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"