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MALPEDIA_Win_Exaramel_Auto

autogenerated rule brought to you by yara-signator

MalwareExaramelMalpedia 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: Exaramel.

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

Summary generated from the rule's metadata and condition.

Rule source

win-exaramel-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Exaramel_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "4bb5336f-6cf5-5598-9713-11e463e3be93"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.exaramel"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.exaramel_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "4a61478d220d51d8955dd61c5e527940bd70efb0e8e883ccfdf3ca9c3103ecf6"
		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 = { 83c404 85c0 7411 8d85ecfbffff 50 e8???????? 83c404 }
		$sequence_1 = { 6685c0 0f8493000000 0fb7c0 83f876 0f8787000000 0fb680b04b4000 ff2485744b4000 }
		$sequence_2 = { b857000780 5b 8be5 5d c3 8d4df0 c745e801000000 }
		$sequence_3 = { 0f85ac180000 8d0d20a34100 ba1b000000 e9???????? a900000080 7517 ebd4 }
		$sequence_4 = { 85c0 0f44ca 8bc1 8b4dfc 33cd 5e e8???????? }
		$sequence_5 = { 8bf0 8b450c 85c0 7428 85db 7431 85ff }
		$sequence_6 = { 83c410 c785b4f5ffff0c000000 8d85b4f5ffff c785b8f5ffff00000000 }
		$sequence_7 = { 57 6a00 e8???????? 3d0e000780 74df 85c0 7950 }
		$sequence_8 = { 6a00 8d85ecfdffff 50 ff770c e8???????? 83c404 50 }
		$sequence_9 = { 837e1800 7416 6a04 8d4d08 c7450800330000 51 6a1f }

	condition:
		7 of them and filesize < 294912
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83c404 85c0 7411 8d85ecfbffff 50 e8???????? 83c404 }
$sequence_1hex{ 6685c0 0f8493000000 0fb7c0 83f876 0f8787000000 0fb680b04b4000 ff2485744b4000 }
$sequence_2hex{ b857000780 5b 8be5 5d c3 8d4df0 c745e801000000 }
$sequence_3hex{ 0f85ac180000 8d0d20a34100 ba1b000000 e9???????? a900000080 7517 ebd4 }
$sequence_4hex{ 85c0 0f44ca 8bc1 8b4dfc 33cd 5e e8???????? }
$sequence_5hex{ 8bf0 8b450c 85c0 7428 85db 7431 85ff }
$sequence_6hex{ 83c410 c785b4f5ffff0c000000 8d85b4f5ffff c785b8f5ffff00000000 }
$sequence_7hex{ 57 6a00 e8???????? 3d0e000780 74df 85c0 7950 }
$sequence_8hex{ 6a00 8d85ecfdffff 50 ff770c e8???????? 83c404 50 }
$sequence_9hex{ 837e1800 7416 6a04 8d4d08 c7450800330000 51 6a1f }

Condition

7 of them and filesize < 294912

In plain words (Heuristic)

  • The file must be smaller than 294912 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

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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: 4bb5336f-6cf5-5598-9713-11e463e3be93

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

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