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SEKOIA_Apt_Implant_Xdealer_Stealer_Strings

Detects stealer module of XDealer

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-03-22
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects stealer module of XDealer

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

apt-implant-xdealer-stealer-strings.yarDetection Rule License 1.1
rule SEKOIA_Apt_Implant_Xdealer_Stealer_Strings : FILE
{
	meta:
		description = "Detects stealer module of XDealer"
		author = "Sekoia.io"
		id = "6314cf6c-2c3b-4e9a-87a1-b56ee148474c"
		date = "2024-03-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_implant_xdealer_stealer_strings.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "79ba2fd14cd2eb73848026f79ce6115df813e0fda3a071ab26659874e04e2201"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "%sbmp.tmp"
		$ = "%sjgp.tmp"
		$ = "%sma_%s_%05u_%u."
		$ = "%s%s_%05u_%u."

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 500KB and all of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$text"%sbmp.tmp"
$text"%sjgp.tmp"
$text"%sma_%s_%05u_%u."
$text"%s%s_%05u_%u."

Condition

uint16be( 0 ) == 0x4d5a and filesize < 500KB and all of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 500KB (a cheap guard that skips large files).
  • All 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: 6314cf6c-2c3b-4e9a-87a1-b56ee148474c

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE