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MALPEDIA_Win_Jolob_Auto

autogenerated rule brought to you by yara-signator

MalwareJolobMalpedia 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: Jolob.

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

Summary generated from the rule's metadata and condition.

Rule source

win-jolob-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Jolob_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "721dfc29-3d7a-50b0-b764-61d802bd0c74"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.jolob"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.jolob_auto.yar#L1-L124"
		license_url = "N/A"
		logic_hash = "4150b0410a36ec9d51a01ff653e14685bef906d672dd1b0e0c49b7b207630fa5"
		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 = { 743a 397e28 7435 8d7e10 }
		$sequence_1 = { 56 ff742408 ff15???????? 8bf0 85f6 740e 56 }
		$sequence_2 = { c7461804000000 8b8f28080000 8b09 6a01 50 51 894e24 }
		$sequence_3 = { 8a8df9feffff 40 40 03c6 8808 0fbed1 8d7801 }
		$sequence_4 = { 5d c20400 ff15???????? 83f840 e9???????? 8b4c240c }
		$sequence_5 = { c644041400 75f8 8d442420 50 ff730c e8???????? 85c0 }
		$sequence_6 = { 8975f8 ff15???????? 33c0 40 5f 5e c9 }
		$sequence_7 = { 84db 7431 2b4c2410 8b542410 }
		$sequence_8 = { e8???????? 89460c 8b06 0faf4604 59 8b4e2c 894608 }
		$sequence_9 = { 8b4dfc 03c1 740d 6a00 }

	condition:
		7 of them and filesize < 196608
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 743a 397e28 7435 8d7e10 }
$sequence_1hex{ 56 ff742408 ff15???????? 8bf0 85f6 740e 56 }
$sequence_2hex{ c7461804000000 8b8f28080000 8b09 6a01 50 51 894e24 }
$sequence_3hex{ 8a8df9feffff 40 40 03c6 8808 0fbed1 8d7801 }
$sequence_4hex{ 5d c20400 ff15???????? 83f840 e9???????? 8b4c240c }
$sequence_5hex{ c644041400 75f8 8d442420 50 ff730c e8???????? 85c0 }
$sequence_6hex{ 8975f8 ff15???????? 33c0 40 5f 5e c9 }
$sequence_7hex{ 84db 7431 2b4c2410 8b542410 }
$sequence_8hex{ e8???????? 89460c 8b06 0faf4604 59 8b4e2c 894608 }
$sequence_9hex{ 8b4dfc 03c1 740d 6a00 }

Condition

7 of them and filesize < 196608

In plain words (Heuristic)

  • The file must be smaller than 196608 (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: 721dfc29-3d7a-50b0-b764-61d802bd0c74

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