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FIREEYE_RT_APT_Downloader_Win32_REDFLARE_1

No description has been set in the source file - FireEye-RT

APT / threat actorMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X
Author
FireEye
Date
2020-11-27
Modified
2020-12-09
Score / Quality
75 / 75

What this rule detects

No description has been set in the source file - FireEye-RT

Targets: Windows PE.

It defines 2 patterns (1 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-downloader-win32-redflare-1.yarBSD 2-Clause License
rule FIREEYE_RT_APT_Downloader_Win32_REDFLARE_1 : FILE
{
	meta:
		description = "No description has been set in the source file - FireEye-RT"
		author = "FireEye"
		id = "e8d7ee31-568e-58ac-98ad-49baa2eb37ea"
		date = "2020-11-27"
		date = "2020-11-27"
		modified = "2020-12-09"
		reference = "https://github.com/mandiant/red_team_tool_countermeasures/"
		source_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/rules/REDFLARE/production/yara/APT_Downloader_Win32_REDFLARE_1.yar#L4-L17"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "05b99d438dac63a5a993cea37c036673"
		logic_hash = "a340a2a732a9b1aa74ca9d84009a88d1b14b6a03140a859384c0d6e745e4a90a"
		score = 75
		quality = 75
		tags = "FILE"
		rev = 1

	strings:
		$const = "Cookie: SID1=%s" fullword
		$http_req = { 00 00 08 80 81 3D [4] BB 01 00 00 75 [1-10] 00 00 80 00 [1-4] 00 10 00 00 [1-4] 00 20 00 00 89 [1-10] 6A 00 8B [1-8] 5? 6A 00 6A 00 6A 00 8B [1-8] 5? 68 [4] 8B [1-8] 5? FF 15 [4-40] 6A 14 E8 }

	condition:
		( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$consttext"Cookie: SID1=%s"fullword
$http_reqhex{ 00 00 08 80 81 3D [4] BB 01 00 00 75 [1-10] 00 00 80 00 [1-4] 00 10 00 00 [1-4] 00 20 00 00 89 [1-10] 6A 00 8B [1-8] 5? 6A 00 6A 00 6A 00 8B [1-8] 5? 68 [4] 8 …

Condition

( uint16( 0 ) == 0x5A4D ) and ( uint32( uint32( 0x3C ) ) == 0x00004550 ) and ( uint16( uint32( 0x3C ) + 0x18 ) == 0x010B ) and all of them

In plain words (Heuristic)

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

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References

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

  • 05b99d438dac63a5a993cea37c036673

Licence & attribution

Author: FireEye

Source repository: Mandiant red team tool countermeasures @ 3561b71724

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright (c) 2023, MANDIANT

Original rule

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

Rule id: e8d7ee31-568e-58ac-98ad-49baa2eb37ea

Metadata

rev1

Tags:FILE