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SEKOIA_Tool_Edrsandblast_Api_Strings

Detects EDRSandblast API strings

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-01-08
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects EDRSandblast API strings

Targets: Windows PE.

It defines 5 patterns (5 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

tool-edrsandblast-api-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_Edrsandblast_Api_Strings : FILE
{
	meta:
		description = "Detects EDRSandblast API strings"
		author = "Sekoia.io"
		id = "8a5dc171-dce8-4b5a-96e9-53dd1855e8c1"
		date = "2024-01-08"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_edrsandblast_api_strings.yar#L1-L21"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "cd6afe68cf04e4949add323e0b5af5ea577b3dca07743e312e8236bf5c937672"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "[!] Required driver file not present at" wide
		$ = "[!] New uninstall / install attempt failed" wide
		$ = "[!] Kernel offsets are missing from the CSV" wide
		$ = "[+] Downloading wdigest offsets from the MS Symbol Server" wide
		$ = "[+] Check if EDR callbacks are registered on process" wide

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 1MB and 4 of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$text"[!] Required driver file not present at"wide
$text"[!] New uninstall / install attempt failed"wide
$text"[!] Kernel offsets are missing from the CSV"wide
$text"[+] Downloading wdigest offsets from the MS Symbol Server"wide
$text"[+] Check if EDR callbacks are registered on process"wide

Condition

uint16be( 0 ) == 0x4d5a and filesize < 1MB and 4 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 1MB (a cheap guard that skips large files).
  • At least 4 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: 8a5dc171-dce8-4b5a-96e9-53dd1855e8c1

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE