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MALPEDIA_Win_Jessiecontea_Auto

autogenerated rule brought to you by yara-signator

MalwareJessieconteaMalpedia 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: Jessiecontea.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-jessiecontea-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Jessiecontea_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "9d64ca7e-a0bd-52a7-a577-888415a044a2"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.jessiecontea"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.jessiecontea_auto.yar#L1-L158"
		license_url = "N/A"
		logic_hash = "cd5290a2f328f5ae54af9983eccd2c6f7265487a9f01ecabfc45226fcef81bba"
		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 = { 6a00 50 e8???????? 83c424 56 6a00 6810040000 }
		$sequence_1 = { bb01000000 57 8bfa 898d84fbffff 57 }
		$sequence_2 = { 57 89bd8cfbffff 898590fbffff ffd6 }
		$sequence_3 = { 50 ff15???????? 8d85d8fbffff 8bd7 }
		$sequence_4 = { b900010000 8db5f8f3ffff 8dbdf8fbffff f3a5 }
		$sequence_5 = { 83c420 85c0 0f843effffff 68???????? }
		$sequence_6 = { 83c261 668956fe 66833e00 75e8 }
		$sequence_7 = { 50 e8???????? 83c40c 8d85f8fbffff 50 6804010000 }
		$sequence_8 = { 488b4de8 ff15???????? 488b4de0 33d2 ff15???????? }
		$sequence_9 = { 6690 8d4701 4c8d0c40 8bc7 }
		$sequence_10 = { 4533c9 4533c0 c744242003000000 ba00000040 ff15???????? 4533c9 }
		$sequence_11 = { 0f284c2460 0f114020 0f28442470 0f114830 }
		$sequence_12 = { 4881c4a0120000 5f 5e 5d c3 }
		$sequence_13 = { ff15???????? 488b0d???????? 4c8d442440 41b904000000 c744244020bf0200 }
		$sequence_14 = { 4c89bc24d0120000 448b7c2470 c744242004000000 c7442450959dd460 f20f1145e0 }
		$sequence_15 = { 488d82f9ffff7f 4885c0 7417 410fb70408 }

	condition:
		7 of them and filesize < 413696
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 6a00 50 e8???????? 83c424 56 6a00 6810040000 }
$sequence_1hex{ bb01000000 57 8bfa 898d84fbffff 57 }
$sequence_2hex{ 57 89bd8cfbffff 898590fbffff ffd6 }
$sequence_3hex{ 50 ff15???????? 8d85d8fbffff 8bd7 }
$sequence_4hex{ b900010000 8db5f8f3ffff 8dbdf8fbffff f3a5 }
$sequence_5hex{ 83c420 85c0 0f843effffff 68???????? }
$sequence_6hex{ 83c261 668956fe 66833e00 75e8 }
$sequence_7hex{ 50 e8???????? 83c40c 8d85f8fbffff 50 6804010000 }
$sequence_8hex{ 488b4de8 ff15???????? 488b4de0 33d2 ff15???????? }
$sequence_9hex{ 6690 8d4701 4c8d0c40 8bc7 }
$sequence_10hex{ 4533c9 4533c0 c744242003000000 ba00000040 ff15???????? 4533c9 }
$sequence_11hex{ 0f284c2460 0f114020 0f28442470 0f114830 }
$sequence_12hex{ 4881c4a0120000 5f 5e 5d c3 }
$sequence_13hex{ ff15???????? 488b0d???????? 4c8d442440 41b904000000 c744244020bf0200 }
$sequence_14hex{ 4c89bc24d0120000 448b7c2470 c744242004000000 c7442450959dd460 f20f1145e0 }
$sequence_15hex{ 488d82f9ffff7f 4885c0 7417 410fb70408 }

Condition

7 of them and filesize < 413696

In plain words (Heuristic)

  • The file must be smaller than 413696 (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: 9d64ca7e-a0bd-52a7-a577-888415a044a2

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