Skip to content

YARA · Malpedia signator rules

MALPEDIA_Win_Havex_Rat_Auto

autogenerated rule brought to you by yara-signator

MalwareHavex RatMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Havex Rat.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-havex-rat-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Havex_Rat_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "7991246d-f84f-56bc-94fa-31ca00c4b2e6"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.havex_rat"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.havex_rat_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "0af582c8543e405171c63f9b74cf05a22861e4a138f7bfd62577aee523a19a0b"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { e8???????? 33db 895dfc b800020000 8d773c c7472003000000 895f24 }
		$sequence_1 = { 8bf0 3bf3 742f 68???????? 8d4dc0 e8???????? 8d45c0 }
		$sequence_2 = { 8b0c81 8bc6 e8???????? 8b45dc 0fb7444358 0fb60c07 51 }
		$sequence_3 = { 2b470c 6a1c 59 99 f7f9 8b4d08 }
		$sequence_4 = { c745fc02000000 8b06 8b4004 57 c70406???????? e8???????? }
		$sequence_5 = { e8???????? c3 6a1c b8???????? e8???????? 8b450c 83781810 }
		$sequence_6 = { 8b7f04 eb03 83c704 33f6 56 50 53 }
		$sequence_7 = { b801040000 8b4d64 5f 33cd 5e e8???????? }
		$sequence_8 = { c1e704 03fe 038f94c90000 039798c90000 8b7ddc 0fb77c7b18 897de0 }
		$sequence_9 = { 8d7304 8b55ec 33ff 85d2 7616 2bc8 3b7de8 }

	condition:
		7 of them and filesize < 892928
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? 33db 895dfc b800020000 8d773c c7472003000000 895f24 }
$sequence_1hex{ 8bf0 3bf3 742f 68???????? 8d4dc0 e8???????? 8d45c0 }
$sequence_2hex{ 8b0c81 8bc6 e8???????? 8b45dc 0fb7444358 0fb60c07 51 }
$sequence_3hex{ 2b470c 6a1c 59 99 f7f9 8b4d08 }
$sequence_4hex{ c745fc02000000 8b06 8b4004 57 c70406???????? e8???????? }
$sequence_5hex{ e8???????? c3 6a1c b8???????? e8???????? 8b450c 83781810 }
$sequence_6hex{ 8b7f04 eb03 83c704 33f6 56 50 53 }
$sequence_7hex{ b801040000 8b4d64 5f 33cd 5e e8???????? }
$sequence_8hex{ c1e704 03fe 038f94c90000 039798c90000 8b7ddc 0fb77c7b18 897de0 }
$sequence_9hex{ 8d7304 8b55ec 33ff 85d2 7616 2bc8 3b7de8 }

Condition

7 of them and filesize < 892928

In plain words (Heuristic)

  • The file must be smaller than 892928 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

References

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

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

Rule id: 7991246d-f84f-56bc-94fa-31ca00c4b2e6

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE