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DITEKSHEN_MALWARE_Win_Quasarstealer

Detects Quasar infostealer

MalwareQuasarstealerditekSHen 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 Quasar infostealer

Associated malware family: Quasarstealer.

Targets: Windows PE.

It defines 7 patterns (7 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-quasarstealer.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Quasarstealer : FILE
{
	meta:
		description = "Detects Quasar infostealer"
		author = "ditekshen"
		id = "d0d532fe-bd0a-560a-8570-f6038d694338"
		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#L2557-L2572"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "4b6ab49992db4d7bf4404d51b0ef1773249de89545ec31176ad45d00803ba703"
		score = 75
		quality = 75
		tags = "FILE"
		clamav_sig = "MALWARE.Win.Trojan.QuasarStealer"

	strings:
		$s1 = "PGma.System.MouseKeyHook, Version=5.6.130.0, Culture=neutral, PublicKeyToken=null" fullword ascii
		$s2 = "DQuasar.Common, Version=1.4.0.0, Culture=neutral, PublicKeyToken=null" fullword ascii
		$s3 = "Process already elevated." fullword wide
		$s4 = "get_PotentiallyVulnerablePasswords" fullword ascii
		$s5 = "GetKeyloggerLogsDirectory" ascii
		$s6 = "set_PotentiallyVulnerablePasswords" fullword ascii
		$s7 = "BQuasar.Client.Extensions.RegistryKeyExtensions+<GetKeyValues>" ascii

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

Strings (7 patterns)

IdentifierTypeValueModifiers
$s1text"PGma.System.MouseKeyHook, Version=5.6.130.0, Culture=neutral, PublicKeyToken=null"fullword ascii
$s2text"DQuasar.Common, Version=1.4.0.0, Culture=neutral, PublicKeyToken=null"fullword ascii
$s3text"Process already elevated."fullword wide
$s4text"get_PotentiallyVulnerablePasswords"fullword ascii
$s5text"GetKeyloggerLogsDirectory"ascii
$s6text"set_PotentiallyVulnerablePasswords"fullword ascii
$s7text"BQuasar.Client.Extensions.RegistryKeyExtensions+<GetKeyValues>"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: d0d532fe-bd0a-560a-8570-f6038d694338

Metadata

clamav_sigMALWARE.Win.Trojan.QuasarStealer

Tags:FILE

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