mirror of
https://github.com/valitydev/SigmaHQ.git
synced 2024-11-08 10:13:57 +00:00
8d6a507ec4
* Checked all rules against Mordor and EVTX samples datasets * Added field names * Some severity adjustments * Fixes
48 lines
1.9 KiB
YAML
48 lines
1.9 KiB
YAML
title: Suspicious In-Memory Module Execution
|
|
id: 5f113a8f-8b61-41ca-b90f-d374fa7e4a39
|
|
description: Detects the access to processes by other suspicious processes which have reflectively loaded libraries in their memory space. An example is SilentTrinity
|
|
C2 behaviour. Generally speaking, when Sysmon EventID 10 cannot reference a stack call to a dll loaded from disk (the standard way), it will display "UNKNOWN"
|
|
as the module name. Usually this means the stack call points to a module that was reflectively loaded in memory. Adding to this, it is not common to see such
|
|
few calls in the stack (ntdll.dll --> kernelbase.dll --> unknown) which essentially means that most of the functions required by the process to execute certain
|
|
routines are already present in memory, not requiring any calls to external libraries. The latter should also be considered suspicious.
|
|
status: experimental
|
|
date: 27/10/2019
|
|
author: Perez Diego (@darkquassar), oscd.community
|
|
references:
|
|
- https://azure.microsoft.com/en-ca/blog/detecting-in-memory-attacks-with-sysmon-and-azure-security-center/
|
|
tags:
|
|
- attack.privilege_escalation
|
|
- attack.t1055
|
|
logsource:
|
|
product: windows
|
|
service: sysmon
|
|
detection:
|
|
selection_01:
|
|
EventID: 10
|
|
CallTrace:
|
|
- "C:\\Windows\\SYSTEM32\\ntdll.dll+*|C:\\Windows\\System32\\KERNELBASE.dll+*|UNKNOWN(*)"
|
|
- "*UNKNOWN(*)|UNKNOWN(*)"
|
|
selection_02:
|
|
EventID: 10
|
|
CallTrace: "*UNKNOWN*"
|
|
granted_access:
|
|
GrantedAccess:
|
|
- "0x1F0FFF"
|
|
- "0x1F1FFF"
|
|
- "0x143A"
|
|
- "0x1410"
|
|
- "0x1010"
|
|
- "0x1F2FFF"
|
|
- "0x1F3FFF"
|
|
- "0x1FFFFF"
|
|
condition: selection_01 OR (selection_02 AND granted_access)
|
|
fields:
|
|
- ComputerName
|
|
- User
|
|
- SourceImage
|
|
- TargetImage
|
|
- CallTrace
|
|
level: critical
|
|
falsepositives:
|
|
- Low
|