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DITEKSHEN_MALWARE_Win_Jesterstealer

Detects JesterStealer

MalwareJesterstealerditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 75

What this rule detects

Detects JesterStealer

Associated malware family: Jesterstealer.

Targets: Windows PE.

It defines 13 patterns (11 text, 0 hex, 2 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-jesterstealer.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Jesterstealer : FILE
{
	meta:
		description = "Detects JesterStealer"
		author = "ditekSHen"
		id = "7b07061f-97a4-5158-8084-46ccf212f6be"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L9397-L9417"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "c84df5d3ad2bc7a75a11c07995cc034c2a92b2f6f6f6943288add9c44c57bf6d"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = /\[(Credman|Networks|Screenshot|Vault)\]\s\{0\}/ fullword wide
		$s3 = "encoding=\"base64\"" fullword wide
		$s4 = "/json/list" fullword wide
		$s5 = "/L1ghtM4n/TorProxy/" ascii wide
		$s6 = "<EnumerateCredentials>" ascii
		$s7 = "<EnumerateBrowsers>" ascii
		$s8 = "<PerformSelfDestruct>" ascii
		$s9 = "<get_GrabberCount>" ascii
		$s10 = "AnalyzeData" fullword ascii
		$s11 = "CheckCard" fullword ascii
		$s12 = "CreateGrabberZipPath" fullword ascii
		$s13 = "Jester" fullword ascii
		$s14 = /Stealer\.(Recovery|Grabber|Investigation)\./ ascii

	condition:
		uint16( 0 ) == 0x5a4d and 5 of them
}

Strings (13 patterns)

IdentifierTypeValueModifiers
$s1regex/\[(Credman|Networks|Screenshot|Vault)\]\s\{0\}/fullword wide
$s3text"encoding=\"base64\""fullword wide
$s4text"/json/list"fullword wide
$s5text"/L1ghtM4n/TorProxy/"ascii wide
$s6text"<EnumerateCredentials>"ascii
$s7text"<EnumerateBrowsers>"ascii
$s8text"<PerformSelfDestruct>"ascii
$s9text"<get_GrabberCount>"ascii
$s10text"AnalyzeData"fullword ascii
$s11text"CheckCard"fullword ascii
$s12text"CreateGrabberZipPath"fullword ascii
$s13text"Jester"fullword ascii
$s14regex/Stealer\.(Recovery|Grabber|Investigation)\./ascii

Condition

uint16( 0 ) == 0x5a4d and 5 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 5 patterns in the rule must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

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

Rule id: 7b07061f-97a4-5158-8084-46ccf212f6be

Tags:FILE

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