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MALPEDIA_Win_Fireball_Auto

autogenerated rule brought to you by yara-signator

MalwareFireballMalpedia 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: Fireball.

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

Summary generated from the rule's metadata and condition.

Rule source

win-fireball-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Fireball_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "134aaca1-fed7-50ba-99e6-c35fcb34af08"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.fireball"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fireball_auto.yar#L1-L131"
		license_url = "N/A"
		logic_hash = "f41f7e819b09c5fb96f2b4b77af5e9c9c0d8d50925493c69bae722c4022b21cf"
		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 = { b101 e8???????? 83c418 85c0 744f 6a01 }
		$sequence_1 = { e8???????? 56 e8???????? 83c404 33c0 83bc247001000008 c78424a001000007000000 }
		$sequence_2 = { 8bb42444010000 8d4c240b e8???????? 51 e8???????? 8d4c240b e8???????? }
		$sequence_3 = { eb76 56 e8???????? 59 8365fc00 8b049d000a2500 f644380401 }
		$sequence_4 = { 668906 83c602 eb33 58 668906 8b0c95000a2500 }
		$sequence_5 = { 8bf7 2b349d000a2500 c1fe06 8bc3 c1e005 03f0 }
		$sequence_6 = { 8b45f4 59 7471 8b0c85000a2500 f644190480 7463 8d45e0 }
		$sequence_7 = { 6800100000 8d85fcefffff 6a01 50 e8???????? 83c410 33d2 }
		$sequence_8 = { e8???????? 83c410 85c0 7560 8d642400 57 6800100000 }
		$sequence_9 = { 64a300000000 6a01 33c0 68???????? 8d8c2404010000 c784241801000007000000 c784241401000000000000 }

	condition:
		7 of them and filesize < 335872
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ b101 e8???????? 83c418 85c0 744f 6a01 }
$sequence_1hex{ e8???????? 56 e8???????? 83c404 33c0 83bc247001000008 c78424a001000007000000 }
$sequence_2hex{ 8bb42444010000 8d4c240b e8???????? 51 e8???????? 8d4c240b e8???????? }
$sequence_3hex{ eb76 56 e8???????? 59 8365fc00 8b049d000a2500 f644380401 }
$sequence_4hex{ 668906 83c602 eb33 58 668906 8b0c95000a2500 }
$sequence_5hex{ 8bf7 2b349d000a2500 c1fe06 8bc3 c1e005 03f0 }
$sequence_6hex{ 8b45f4 59 7471 8b0c85000a2500 f644190480 7463 8d45e0 }
$sequence_7hex{ 6800100000 8d85fcefffff 6a01 50 e8???????? 83c410 33d2 }
$sequence_8hex{ e8???????? 83c410 85c0 7560 8d642400 57 6800100000 }
$sequence_9hex{ 64a300000000 6a01 33c0 68???????? 8d8c2404010000 c784241801000007000000 c784241401000000000000 }

Condition

7 of them and filesize < 335872

In plain words (Heuristic)

  • The file must be smaller than 335872 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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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: 134aaca1-fed7-50ba-99e6-c35fcb34af08

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