YARA · SEKOIA.IO Community
SEKOIA_Backdoor_Opensource_Northstar_Strings
Detects the NorthStar Backdoor strings
- 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:
= "Detects the NorthStar Backdoor strings"
= "Sekoia.io"
= "6bf2f428-ec1a-4115-9c5e-258e9176969a"
= "2022-08-23"
= "2024-12-19"
= "https://github.com/SEKOIA-IO/Community"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/backdoor_opensource_northstar_strings.yar#L1-L21"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
= "c4cf8935137c1420106807240de7583ca8f5c0b231f51bba279aedf672e25274"
= 75
= 80
= "FILE"
= "1.0"
= "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)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $ | 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 themIn 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)
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
| version | 1.0 |
|---|---|
| classification | TLP:CLEAR |
Tags:FILE
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