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MALPEDIA_Win_Newbounce_Auto

autogenerated rule brought to you by yara-signator

MalwareNewbounceMalpedia 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: Newbounce.

It defines 15 patterns (0 text, 15 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-newbounce-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Newbounce_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "554f1f64-8795-5f81-a4e0-9ae2b3fe03d2"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.newbounce"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.newbounce_auto.yar#L1-L144"
		license_url = "N/A"
		logic_hash = "5871c2f4b934fe6925fce9367be6b26e7a02354d682ba41ca50d8bbad1475c5c"
		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 = { 83e00f 7e05 2bf0 83c610 }
		$sequence_1 = { 7cd4 2983d0010000 3bfe 7530 }
		$sequence_2 = { 7cd6 488d0d527a0200 e8???????? 448b460c }
		$sequence_3 = { 7cba 4863c3 6644893447 eb31 }
		$sequence_4 = { 7cca 488d0d108f0200 448bc6 8bd3 }
		$sequence_5 = { 7cd5 81fb401f0000 750d 44392d???????? }
		$sequence_6 = { 7cdd 488b8c2420100000 4833cc e8???????? }
		$sequence_7 = { 7cc4 4883c8ff eb03 488bc7 }
		$sequence_8 = { 81e7ff000000 3304bd485b6300 895c2458 3304ad48536300 }
		$sequence_9 = { 81e7ff000000 89442444 89bc24c8000000 8bf8 c1e818 8b0485485b6300 }
		$sequence_10 = { 81e7ff000000 896c2410 8be8 8b04bd48536300 }
		$sequence_11 = { 81e7ff000000 330cbd48576300 c1e208 330c8548536300 }
		$sequence_12 = { 81e7ff000000 3304bd485f6300 33442418 33442410 }
		$sequence_13 = { 81e7???????? e8???????? 6aff 6aff 8d4510 50 ff15???????? }
		$sequence_14 = { 81e7ff000000 8b0cbd48576300 894c241c 8b0c9d48536300 }

	condition:
		7 of them and filesize < 8637440
}

Strings (15 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 83e00f 7e05 2bf0 83c610 }
$sequence_1hex{ 7cd4 2983d0010000 3bfe 7530 }
$sequence_2hex{ 7cd6 488d0d527a0200 e8???????? 448b460c }
$sequence_3hex{ 7cba 4863c3 6644893447 eb31 }
$sequence_4hex{ 7cca 488d0d108f0200 448bc6 8bd3 }
$sequence_5hex{ 7cd5 81fb401f0000 750d 44392d???????? }
$sequence_6hex{ 7cdd 488b8c2420100000 4833cc e8???????? }
$sequence_7hex{ 7cc4 4883c8ff eb03 488bc7 }
$sequence_8hex{ 81e7ff000000 3304bd485b6300 895c2458 3304ad48536300 }
$sequence_9hex{ 81e7ff000000 89442444 89bc24c8000000 8bf8 c1e818 8b0485485b6300 }
$sequence_10hex{ 81e7ff000000 896c2410 8be8 8b04bd48536300 }
$sequence_11hex{ 81e7ff000000 330cbd48576300 c1e208 330c8548536300 }
$sequence_12hex{ 81e7ff000000 3304bd485f6300 33442418 33442410 }
$sequence_13hex{ 81e7???????? e8???????? 6aff 6aff 8d4510 50 ff15???????? }
$sequence_14hex{ 81e7ff000000 8b0cbd48576300 894c241c 8b0c9d48536300 }

Condition

7 of them and filesize < 8637440

In plain words (Heuristic)

  • The file must be smaller than 8637440 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

Test this rule in your browser

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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: 554f1f64-8795-5f81-a4e0-9ae2b3fe03d2

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