YARA · Malpedia signator rules
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:
= "autogenerated rule brought to you by yara-signator"
= "Felix Bilstein - yara-signator at cocacoding dot com"
= "134aaca1-fed7-50ba-99e6-c35fcb34af08"
= "2026-05-04"
= "2026-05-18"
= "https://malpedia.caad.fkie.fraunhofer.de/details/win.fireball"
= "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.fireball_auto.yar#L1-L131"
= "N/A"
= "f41f7e819b09c5fb96f2b4b77af5e9c9c0d8d50925493c69bae722c4022b21cf"
= 75
= 75
= "FILE"
= "1"
= "yara-signator v0.6.0"
= "callsandjumps;datarefs;binvalue"
= "20260422"
= "a182e35da64e6d71cb55f125c4d4225196523f14"
= "20260504"
= "CC BY-SA 4.0"
= "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)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $sequence_0 | hex | { b101 e8???????? 83c418 85c0 744f 6a01 } | |
| $sequence_1 | hex | { e8???????? 56 e8???????? 83c404 33c0 83bc247001000008 c78424a001000007000000 } | |
| $sequence_2 | hex | { 8bb42444010000 8d4c240b e8???????? 51 e8???????? 8d4c240b e8???????? } | |
| $sequence_3 | hex | { eb76 56 e8???????? 59 8365fc00 8b049d000a2500 f644380401 } | |
| $sequence_4 | hex | { 668906 83c602 eb33 58 668906 8b0c95000a2500 } | |
| $sequence_5 | hex | { 8bf7 2b349d000a2500 c1fe06 8bc3 c1e005 03f0 } | |
| $sequence_6 | hex | { 8b45f4 59 7471 8b0c85000a2500 f644190480 7463 8d45e0 } | |
| $sequence_7 | hex | { 6800100000 8d85fcefffff 6a01 50 e8???????? 83c410 33d2 } | |
| $sequence_8 | hex | { e8???????? 83c410 85c0 7560 8d642400 57 6800100000 } | |
| $sequence_9 | hex | { 64a300000000 6a01 33c0 68???????? 8d8c2404010000 c784241801000007000000 c784241401000000000000 } |
Condition
7 of them and filesize < 335872In 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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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)
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
| 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 |
Tags:FILE
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