Detection rules › Sigma
PUA - Nimgrab Execution
Detects the usage of nimgrab, a tool bundled with the Nim programming framework and used for downloading files.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Command & Control | T1105 Ingress Tool Transfer |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: PUA - Nimgrab Execution
id: 74a12f18-505c-4114-8d0b-8448dd5485c6
status: test
description: Detects the usage of nimgrab, a tool bundled with the Nim programming framework and used for downloading files.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/28d190330fe44de6ff4767fc400cc10fa7cd6540/atomics/T1105/T1105.md
author: frack113
date: 2022-08-28
modified: 2024-11-23
tags:
- attack.command-and-control
- attack.t1105
logsource:
category: process_creation
product: windows
detection:
selection_name:
Image|endswith: '\nimgrab.exe'
selection_hashes:
Hashes|contains:
- MD5=2DD44C3C29D667F5C0EF5F9D7C7FFB8B
- SHA256=F266609E91985F0FE3E31C5E8FAEEEC4FFA5E0322D8B6F15FE69F4C5165B9559
- IMPHASH=C07FDDD21D123EA9B3A08EEF44AAAC45
condition: 1 of selection_*
falsepositives:
- Legitimate use of Nim on a developer systems
level: high
Stages and Predicates
Stage 0: condition
1 of selection_*Stage 1: selection_name
selection_name:
Image|endswith: '\nimgrab.exe'
Stage 2: selection_hashes
selection_hashes:
Hashes|contains:
- MD5=2DD44C3C29D667F5C0EF5F9D7C7FFB8B
- SHA256=F266609E91985F0FE3E31C5E8FAEEEC4FFA5E0322D8B6F15FE69F4C5165B9559
- IMPHASH=C07FDDD21D123EA9B3A08EEF44AAAC45
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.