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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_HKTL_NET_NAME_Dotnetinject

Detects .NET red/black-team tools via name

Hack toolSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Arnim Rupp
Date
2021-01-22
Modified
2022-06-28
Score / Quality
75 / 85

What this rule detects

Detects .NET red/black-team tools via name

Targets: Windows PE.

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
hktl-net-name-dotnetinject.yarDetection Rule License 1.1
rule SIGNATURE_BASE_HKTL_NET_NAME_Dotnetinject : FILE
{
	meta:
		description = "Detects .NET red/black-team tools via name"
		author = "Arnim Rupp"
		id = "468f89c4-5b94-53be-b9e6-ad21de7d98ba"
		date = "2021-01-22"
		modified = "2022-06-28"
		reference = "https://github.com/dtrizna/DotNetInject"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_github_net_redteam_tools_names.yar#L182-L202"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "07ba4ba23372dbc2618dcea89ef643cd68371ace1116bfeb939b0f9adfc425bb"
		score = 75
		quality = 85
		tags = "FILE"
		license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"

	strings:
		$name = "DotNetInject" ascii wide
		$compile = "AssemblyTitle" ascii wide
		$fp1 = "GetDotNetInjector" ascii
		$fp2 = "JetBrains.TeamCity.Injector." wide

	condition:
		( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and filesize < 20MB and $name and $compile and not 1 of ( $fp* )
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$nametext"DotNetInject"ascii wide
$compiletext"AssemblyTitle"ascii wide
$fp1text"GetDotNetInjector"ascii
$fp2text"JetBrains.TeamCity.Injector."wide

Condition

( uint16( 0 ) == 0x5A4D and uint32( uint32( 0x3C ) ) == 0x00004550 ) and filesize < 20MB and $name and $compile and not 1 of ( $fp* )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 20MB (a cheap guard that skips large files).
  • At least 1 patterns in ( $fp* ) must match.
  • Pattern $name must be present.
  • Pattern $compile must be present.

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References

Licence & attribution

Author: Arnim Rupp

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (stated in the rule's own meta)

“Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE”

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 468f89c4-5b94-53be-b9e6-ad21de7d98ba

Tags:FILE

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