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MALPEDIA_Win_Rambo_Auto

autogenerated rule brought to you by yara-signator

MalwareRamboMalpedia 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: Rambo.

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

Summary generated from the rule's metadata and condition.

Rule source

win-rambo-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Rambo_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "609623dc-549f-57b1-8b2d-3525d67579fa"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rambo"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.rambo_auto.yar#L1-L173"
		license_url = "N/A"
		logic_hash = "05f9ac9a9a64960824cdad5ca8e789cf6b2f34ae99d30e1b72925993e7a5fe3f"
		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 = { 56 6800040000 8d85f8faffff 6a00 50 e8???????? 83c40c }
		$sequence_1 = { 8d85f8feffff 50 c645fc72 c645fd62 ff15???????? 8bf0 }
		$sequence_2 = { 83c420 85f6 7437 56 }
		$sequence_3 = { 59 50 ff7508 ff15???????? 56 ff15???????? }
		$sequence_4 = { 6a32 ff15???????? 8d85f8faffff 50 68???????? e8???????? 59 }
		$sequence_5 = { 56 ff15???????? 8d85ecfdffff 50 8d85f0feffff 50 ff15???????? }
		$sequence_6 = { 8d85fcfeffff 50 e8???????? 59 8d85fcfeffff 59 }
		$sequence_7 = { 56 6a01 ff7508 e8???????? 59 50 ff7508 }
		$sequence_8 = { 8d4c2424 c684240804000013 e8???????? 50 }
		$sequence_9 = { 68???????? 6801000080 ff15???????? 85c0 756b }
		$sequence_10 = { c644245135 885c2452 c644245438 c644245531 c644245637 }
		$sequence_11 = { 75ef ff15???????? 5f 5e }
		$sequence_12 = { e8???????? 89842494000000 8b442424 6a00 50 8d8c24a4000000 }
		$sequence_13 = { c684240404000009 e8???????? 8d4c2410 c684240004000007 e8???????? 68b6000000 8d542414 }
		$sequence_14 = { e8???????? b941000000 33c0 8dbc24ec000000 be???????? f3ab }
		$sequence_15 = { 8d8c2488000000 e8???????? 55 55 }

	condition:
		7 of them and filesize < 57344
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 56 6800040000 8d85f8faffff 6a00 50 e8???????? 83c40c }
$sequence_1hex{ 8d85f8feffff 50 c645fc72 c645fd62 ff15???????? 8bf0 }
$sequence_2hex{ 83c420 85f6 7437 56 }
$sequence_3hex{ 59 50 ff7508 ff15???????? 56 ff15???????? }
$sequence_4hex{ 6a32 ff15???????? 8d85f8faffff 50 68???????? e8???????? 59 }
$sequence_5hex{ 56 ff15???????? 8d85ecfdffff 50 8d85f0feffff 50 ff15???????? }
$sequence_6hex{ 8d85fcfeffff 50 e8???????? 59 8d85fcfeffff 59 }
$sequence_7hex{ 56 6a01 ff7508 e8???????? 59 50 ff7508 }
$sequence_8hex{ 8d4c2424 c684240804000013 e8???????? 50 }
$sequence_9hex{ 68???????? 6801000080 ff15???????? 85c0 756b }
$sequence_10hex{ c644245135 885c2452 c644245438 c644245531 c644245637 }
$sequence_11hex{ 75ef ff15???????? 5f 5e }
$sequence_12hex{ e8???????? 89842494000000 8b442424 6a00 50 8d8c24a4000000 }
$sequence_13hex{ c684240404000009 e8???????? 8d4c2410 c684240004000007 e8???????? 68b6000000 8d542414 }
$sequence_14hex{ e8???????? b941000000 33c0 8dbc24ec000000 be???????? f3ab }
$sequence_15hex{ 8d8c2488000000 e8???????? 55 55 }

Condition

7 of them and filesize < 57344

In plain words (Heuristic)

  • The file must be smaller than 57344 (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: 609623dc-549f-57b1-8b2d-3525d67579fa

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