From 431dcc17a4dd9ac9d2ce32721c772af2bf931a25 Mon Sep 17 00:00:00 2001 From: Samirbous <64742097+Samirbous@users.noreply.github.com> Date: Tue, 22 Sep 2020 22:41:26 +0200 Subject: [PATCH] [New Rule] Remote File Download via Desktopimgdownldr Utility (#249) * [New Rule] Remote File Download via Desktopimgdownldr Utility * Update command_and_control_remote_file_copy_desktopimgdownldr.toml * Update rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml Co-authored-by: Justin Ibarra * Update rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml Co-authored-by: Justin Ibarra * Update rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Lint rule Co-authored-by: Justin Ibarra Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com> --- ...ol_remote_file_copy_desktopimgdownldr.toml | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml diff --git a/rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml b/rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml new file mode 100644 index 000000000..6cd6a4281 --- /dev/null +++ b/rules/windows/command_and_control_remote_file_copy_desktopimgdownldr.toml @@ -0,0 +1,43 @@ +[metadata] +creation_date = "2020/09/03" +ecs_version = ["1.6.0"] +maturity = "production" +updated_date = "2020/09/03" + +[rule] +author = ["Elastic"] +description = """ +Identifies the desktopimgdownldr utility being used to download a remote file. An adversary may use desktopimgdownldr to +download arbitrary files as an alternative to certutil. +""" +from = "now-9m" +index = ["winlogbeat-*", "logs-endpoint.events.*"] +language = "kuery" +license = "Elastic License" +name = "Remote File Download via Desktopimgdownldr Utility" +references = ["https://labs.sentinelone.com/living-off-windows-land-a-new-native-file-downldr/"] +risk_score = 47 +rule_id = "15c0b7a7-9c34-4869-b25b-fa6518414899" +severity = "medium" +tags = ["Elastic", "Windows"] +type = "query" + +query = ''' +event.category:process and event.type:(start or process_started) and + (process.name:desktopimgdownldr.exe or process.pe.original_file_name:desktopimgdownldr.exe) and process.args:/lockscreenurl\:http* +''' + + +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +id = "T1105" +name = "Remote File Copy" +reference = "https://attack.mitre.org/techniques/T1105/" + + +[rule.threat.tactic] +id = "TA0011" +name = "Command and Control" +reference = "https://attack.mitre.org/tactics/TA0011/" +