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YARA · SEKOIA.IO Community

SEKOIA_Backdoor_Opensource_Northstar_Strings

Detects the NorthStar Backdoor strings

MalwareSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2022-08-23
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects the NorthStar Backdoor strings

Targets: Windows PE.

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

backdoor-opensource-northstar-strings.yarDetection Rule License 1.1
rule SEKOIA_Backdoor_Opensource_Northstar_Strings : FILE
{
	meta:
		description = "Detects the NorthStar Backdoor strings"
		author = "Sekoia.io"
		id = "6bf2f428-ec1a-4115-9c5e-258e9176969a"
		date = "2022-08-23"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/backdoor_opensource_northstar_strings.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "c4cf8935137c1420106807240de7583ca8f5c0b231f51bba279aedf672e25274"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "_SAMDUMP.zip" wide
		$ = "northstar" wide
		$ = "smanage.php?sid=" wide
		$ = "File Not Exists" wide
		$ = "<enablecmd or enable cmd>" wide
		$ = "getjuice.php" wide

	condition:
		uint16be( 0 ) == 0x4d5a and 6 of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$text"_SAMDUMP.zip"wide
$text"northstar"wide
$text"smanage.php?sid="wide
$text"File Not Exists"wide
$text"<enablecmd or enable cmd>"wide
$text"getjuice.php"wide

Condition

uint16be( 0 ) == 0x4d5a and 6 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 6 patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

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

Rule id: 6bf2f428-ec1a-4115-9c5e-258e9176969a

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE