YARA · Mandiant red team tool countermeasures

FIREEYE_RT_APT_Backdoor_Win_Gorat_Memory

Identifies GoRat malware in memory based on strings.

APT / threat actorMandiant red team tool countermeasuresBSD 2-Clause LicenseCompiles with YARA-X (with warnings)

Author: FireEye
Date: 2020-12-08
Modified: 2020-12-09
Score / Quality: 75 / 75

What this rule detects

Identifies GoRat malware in memory based on strings.

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

YARA-X says: warning[duplicate_pattern_value]: duplicate pattern value

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-backdoor-win-gorat-memory.yarBSD 2-Clause License

rule FIREEYE_RT_APT_Backdoor_Win_Gorat_Memory
{
	meta:
		description = "Identifies GoRat malware in memory based on strings."
		author = "FireEye"
		id = "16fb1db7-711c-5d8d-9203-738c94f253fe"
		date = "2020-12-08"
		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 (Gorat)/production/yara/APT_Backdoor_Win_GoRat_Memory.yar#L4-L27"
		license_url = "https://github.com/mandiant/red_team_tool_countermeasures//blob/3561b71724dbfa3e2bb78106aaa2d7f8b892c43b/LICENSE.txt"
		hash = "3b926b5762e13ceec7ac3a61e85c93bb"
		logic_hash = "88272e59325d106f96d6b6f1d57daf968823c1e760067dee0334c66c521ce8c2"
		score = 75
		quality = 75
		tags = ""
		rev = 1

	strings:
		$murica = "murica" fullword
		$rat1 = "rat/modules/socks.(*HTTPProxyClient).beacon" fullword
		$rat2 = "rat.(*Core).generateBeacon" fullword
		$rat3 = "rat.gJitter" fullword
		$rat4 = "rat/comms.(*protectedChannel).SendCmdResponse" fullword
		$rat5 = "rat/modules/filemgmt.(*acquire).NewCommandExecution" fullword
		$rat6 = "rat/modules/latlisten.(*latlistensrv).handleCmd" fullword
		$rat7 = "rat/modules/netsweeper.(*netsweeperRunner).runSweep" fullword
		$rat8 = "rat/modules/netsweeper.(*Pinger).listen" fullword
		$rat9 = "rat/modules/socks.(*HTTPProxyClient).beacon" fullword
		$rat10 = "rat/platforms/win/dyloader.(*memoryLoader).ExecutePluginFunction" fullword
		$rat11 = "rat/platforms/win/modules/namedpipe.(*dummy).Open" fullword
		$winblows = "rat/platforms/win.(*winblows).GetStage" fullword

	condition:
		$winblows or #murica > 10 or 3 of ( $rat* )
}

Strings (13 patterns)

Identifier	Type	Value	Modifiers
$murica	text	"murica"	fullword
$rat1	text	"rat/modules/socks.(*HTTPProxyClient).beacon"	fullword
$rat2	text	"rat.(*Core).generateBeacon"	fullword
$rat3	text	"rat.gJitter"	fullword
$rat4	text	"rat/comms.(*protectedChannel).SendCmdResponse"	fullword
$rat5	text	"rat/modules/filemgmt.(*acquire).NewCommandExecution"	fullword
$rat6	text	"rat/modules/latlisten.(*latlistensrv).handleCmd"	fullword
$rat7	text	"rat/modules/netsweeper.(*netsweeperRunner).runSweep"	fullword
$rat8	text	"rat/modules/netsweeper.(*Pinger).listen"	fullword
$rat9	text	"rat/modules/socks.(*HTTPProxyClient).beacon"	fullword
$rat10	text	"rat/platforms/win/dyloader.(*memoryLoader).ExecutePluginFunction"	fullword
$rat11	text	"rat/platforms/win/modules/namedpipe.(*dummy).Open"	fullword
$winblows	text	"rat/platforms/win.(*winblows).GetStage"	fullword

Condition

$winblows or #murica > 10 or 3 of ( $rat* )

In plain words (Heuristic)

At least 3 patterns in ( $rat* ) must match.
Pattern $murica must occur > 10 times.
Pattern $winblows must be present.

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References

https://github.com/mandiant/red_team_tool_countermeasures/

Sample hashes

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

3b926b5762e13ceec7ac3a61e85c93bb

Licence & attribution

Author: FireEye

Source repository: Mandiant red team tool countermeasures @ 3561b71724

Licence: BSD 2-Clause License (repository licence)

Original rule

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

Rule id: 16fb1db7-711c-5d8d-9203-738c94f253fe

Metadata

rev	1

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APT / threat actorMandiant red team tool countermeasures· FireEye· 2020-12-02
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