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MALPEDIA_Win_Jimmy_Auto

autogenerated rule brought to you by yara-signator

MalwareJimmyMalpedia 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: Jimmy.

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

Summary generated from the rule's metadata and condition.

Rule source

win-jimmy-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Jimmy_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "76343dd1-0001-5a82-b43c-5f555f80a0e2"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.jimmy"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.jimmy_auto.yar#L1-L123"
		license_url = "N/A"
		logic_hash = "088f488629025008909d1b724760373f32f2ec368a4f05990a17a04953fa6e70"
		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 = { 837d0800 7410 8b4508 0fb700 85c0 }
		$sequence_1 = { e8???????? 59 8945dc ff75e4 ff75ec 68???????? 68???????? }
		$sequence_2 = { ff75fc 6a00 e8???????? 83c428 85c0 7425 6888130000 }
		$sequence_3 = { 59 59 8945f8 837df800 7502 eb53 8b45f8 }
		$sequence_4 = { ff75f4 8b4508 ff30 e8???????? 83c410 8945c0 }
		$sequence_5 = { 8b4dec 8908 ff75f0 e8???????? }
		$sequence_6 = { 7410 8b4508 0fbe00 85c0 7406 8365fc00 eb07 }
		$sequence_7 = { eb27 ff75f4 e8???????? 034508 50 }
		$sequence_8 = { ff75bc 6a00 8b4508 83c008 50 8b4508 }
		$sequence_9 = { 8985e8fffdff 8d850000feff 8985e4fffdff eb1c ffb5e4fffdff }

	condition:
		7 of them and filesize < 188416
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 837d0800 7410 8b4508 0fb700 85c0 }
$sequence_1hex{ e8???????? 59 8945dc ff75e4 ff75ec 68???????? 68???????? }
$sequence_2hex{ ff75fc 6a00 e8???????? 83c428 85c0 7425 6888130000 }
$sequence_3hex{ 59 59 8945f8 837df800 7502 eb53 8b45f8 }
$sequence_4hex{ ff75f4 8b4508 ff30 e8???????? 83c410 8945c0 }
$sequence_5hex{ 8b4dec 8908 ff75f0 e8???????? }
$sequence_6hex{ 7410 8b4508 0fbe00 85c0 7406 8365fc00 eb07 }
$sequence_7hex{ eb27 ff75f4 e8???????? 034508 50 }
$sequence_8hex{ ff75bc 6a00 8b4508 83c008 50 8b4508 }
$sequence_9hex{ 8985e8fffdff 8d850000feff 8985e4fffdff eb1c ffb5e4fffdff }

Condition

7 of them and filesize < 188416

In plain words (Heuristic)

  • The file must be smaller than 188416 (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: 76343dd1-0001-5a82-b43c-5f555f80a0e2

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